diff --git a/docs/USER_GUIDE.md b/docs/USER_GUIDE.md
index 57797c3..d3e1c1c 100644
--- a/docs/USER_GUIDE.md
+++ b/docs/USER_GUIDE.md
@@ -156,8 +156,24 @@ Windows 11, macOS 13+, Ubuntu 24.04 LTS или Debian 13. Эти требова
 добавлять и удалять треки. При перестановке текущий файл продолжает играть;
 следующий трек выбирается по новому порядку. Если состав треков изменился
 на сервере, отмените черновик и повторите перестановку по актуальному списку.
-Используемый игрой или сценарием плейлист и его треки удалить нельзя.
-Редактирование требует сети; сохранённая музыка продолжает играть без неё.
+Назначенный игре или сценарию плейлист удалить нельзя. Изменение состава,
+порядка треков, режима завершения и удаление активной или приостановленной группы
+требуют остановки музыки во всех использующих её играх; переименование доступно.
+
+Создание и настройка групп находятся только в режиме редактирования. У группы
+есть название и режим завершения: «Повторять группу», «Остановиться» или
+«Следующая группа». Группы переставляются кнопками ↑ / ↓; переход следует этому
+порядку, пропускает пустые группы и останавливается после последней. Треки
+переносятся выбором группы; удаление группы оставляет её треки в «Без группы».
+Редактор сохраняет изменения на сервере. При закрытии несохранённого черновика
+приложение предлагает отменить изменения; потеря связи не стирает черновик.
+
+В обычном режиме доступны группы и «Играть группу»: сразу запускается её первый
+трек. «Играть весь плейлист» снимает ограничение группы и возвращает обычный
+повтор плейлиста. Подготовленные группы, их порядок и режимы доступны без сети;
+если следующего локального файла нет, музыка останавливается с ошибкой. После
+восстановления связи применяется серверное состояние без повторной отправки
+офлайн-команд. После перезапуска музыка остаётся остановленной.
 
 ### Текст, QR-код, команды, таймер и результаты
 
diff --git a/electron/controller.test.ts b/electron/controller.test.ts
index e024152..6d6865f 100644
--- a/electron/controller.test.ts
+++ b/electron/controller.test.ts
@@ -335,8 +335,10 @@ test('автопауза не запускает остановленную му
     c.selectPackage(testPackage())
     send(c, { action: 'play', channel: 'music' })
     send(c, { action: 'mode', mode: 2 })
-    if (reset === 'session') { c.output(false); c.output(true) }
-    else if (reset === 'game') c.selectPackage(testPackage())
+    if (reset === 'session') {
+      c.output(false)
+      c.output(true)
+    } else if (reset === 'game') c.selectPackage(testPackage())
     else ack(c, 'music', 'error')
     send(c, { action: 'mode', mode: 1 })
     assert.notEqual(c.state.channels.music.desired, 'playing')
@@ -373,3 +375,33 @@ test('серверная синхронизация не отменяет лок
     assert.equal(c.state.channels.music.desired, 'paused')
   }
 })
+
+for (const endMode of ['repeat', 'stop', 'next'] as const) {
+  test(`локальная группа: ${endMode}, ручной выбор и остановка`, () => {
+    const pkg = testPackage()
+    pkg.package.playlists[0]!.groups = [
+      { id: 1, name: 'First', position: 0, endMode },
+      { id: 3, name: 'Empty', position: 1, endMode: 'repeat' },
+      { id: 2, name: 'Final', position: 2, endMode: 'stop' },
+    ]
+    pkg.package.playlists[0]!.tracks[0]!.groupId = 1
+    pkg.package.playlists[0]!.tracks[1]!.groupId = 2
+    const c = new Controller(() => {})
+    c.selectPackage(pkg)
+    c.output(true)
+    send(c, { action: 'group', channel: 'music', groupId: 1 })
+    assert.equal(c.state.channels.music.desired, 'playing')
+    assert.equal(c.state.channels.music.groupId, 1)
+    assert.throws(() => send(c, { action: 'group', channel: 'music', groupId: 3 }), /пуста/)
+    ack(c, 'music', 'ended', 4, 4)
+    assert.equal(c.state.channels.music.groupId, endMode === 'next' ? 2 : 1)
+    assert.equal(c.state.channels.music.trackIndex, endMode === 'next' ? 1 : 0)
+    assert.equal(c.state.channels.music.desired, endMode === 'stop' ? 'stopped' : 'playing')
+    send(c, { action: 'track', channel: 'music', trackIndex: 1 })
+    assert.equal(c.state.channels.music.groupId, 2)
+    send(c, { action: 'group', channel: 'music', groupId: 0 })
+    assert.equal(c.state.channels.music.groupId, 0)
+    assert.equal(c.state.channels.music.trackIndex, 0)
+    assert.equal(c.state.channels.music.desired, 'playing')
+  })
+}
diff --git a/electron/controller.ts b/electron/controller.ts
index 0df0124..85f5d0b 100644
--- a/electron/controller.ts
+++ b/electron/controller.ts
@@ -1,3 +1,4 @@
+import { nextMusicTrack } from '../src/utils/musicGroups.js'
 import { randomUUID } from 'node:crypto'
 import { performance } from 'node:perf_hooks'
 import { isDeepStrictEqual } from 'node:util'
@@ -104,6 +105,11 @@ export function parseCommand(value: unknown): Command {
           throw new Error('Некорректный плейлист')
         intent = { action: 'playlist', channel, playlistId: c.playlistId }
         break
+      case 'group':
+        if (channel !== 'music' || !number(c.groupId, 0) || !Number.isSafeInteger(c.groupId))
+          throw new Error('Некорректная группа')
+        intent = { action: 'group', channel, groupId: c.groupId }
+        break
       case 'track':
         if (channel !== 'music' || !number(c.trackIndex, 0) || !Number.isSafeInteger(c.trackIndex))
           throw new Error('Некорректный трек')
@@ -159,6 +165,7 @@ function initialChannel(): ChannelState {
     error: '',
     playlistId: null,
     trackIndex: 0,
+    groupId: 0,
     loop: false,
   }
 }
@@ -276,9 +283,11 @@ export class Controller {
         playlists: pkg.package.playlists.map((p) => ({
           id: p.id,
           name: p.name,
+          ...(p.groups ? { groups: p.groups } : {}),
           tracks: p.tracks.map((t) => ({
             id: t.id,
             name: t.name,
+            ...(t.groupId ? { groupId: t.groupId } : {}),
             source: source(`track-${p.id}-${t.id}`, t.assetId, t.name, 'audio'),
           })),
         })),
@@ -291,6 +300,22 @@ export class Controller {
       const tracks = catalog.playlists.find((p) => p.id === music.playlistId)?.tracks
       const index = tracks?.findIndex((t) => t.source.url === music.source?.url) ?? -1
       if (index >= 0) music.trackIndex = index
+      const playlist = catalog.playlists.find((p) => p.id === music.playlistId)
+      if (
+        music.groupId &&
+        (!playlist?.groups?.some((g) => g.id === music.groupId) ||
+          playlist.tracks[index]?.groupId !== music.groupId)
+      ) {
+        this.change('music', {
+          groupId: 0,
+          desired: 'stopped',
+          status: 'stopped',
+          position: 0,
+          trackIndex: Math.max(index, 0),
+          source: tracks?.[index]?.source ?? null,
+          duration: null,
+        })
+      }
       this.state.catalog = catalog
       this.broadcast()
       return
@@ -576,17 +601,34 @@ export class Controller {
   }
   private advance() {
     const c = this.state.channels.music
-    const tracks = this.state.catalog.playlists.find((p) => p.id === c.playlistId)?.tracks ?? []
-    if (!tracks.length) throw new Error('Плейлист пуст')
-    const next = c.trackIndex + 1
-    if (next < tracks.length || c.loop) this.track(next % tracks.length)
-    else
+    const playlist = this.state.catalog.playlists.find((p) => p.id === c.playlistId)
+    if (!playlist?.tracks.length) throw new Error('Плейлист пуст')
+    const next = nextMusicTrack(playlist, c.trackIndex, c.groupId, c.loop)
+    if (next) {
+      c.groupId = next.groupId
+      this.track(next.index)
+    } else if (c.groupId) {
+      this.change('music', { desired: 'stopped', status: 'stopped', position: 0 })
+    } else {
       this.change('music', {
         desired: 'paused',
         status: 'ended',
         position: c.duration ?? c.position,
       })
+    }
   }
+  synchronizeMusicGroup(groupId: number) {
+    const c = this.state.channels.music
+    const playlist = this.state.catalog.playlists.find((p) => p.id === c.playlistId)
+    if (
+      groupId &&
+      (!playlist?.groups?.some((group) => group.id === groupId) ||
+        playlist.tracks[c.trackIndex]?.groupId !== groupId)
+    )
+      throw new Error('Группа ожидает подготовки локальных материалов')
+    c.groupId = groupId
+  }
+
   command(input: unknown) {
     const command = parseCommand(input)
     if (command.session !== this.state.session || command.sequence <= this.state.sequence) return
@@ -615,6 +657,7 @@ export class Controller {
           if (!playlist) throw new Error('Плейлист не найден в выбранном пакете')
           this.change(channel, {
             playlistId: playlist.id,
+            groupId: 0,
             trackIndex: 0,
             source: playlist.tracks[0]?.source ?? null,
             position: 0,
@@ -624,9 +667,38 @@ export class Controller {
           })
           break
         }
-        case 'track':
+        case 'group': {
+          const playlist = this.state.catalog.playlists.find((p) => p.id === c.playlistId)
+          if (
+            !playlist ||
+            (command.groupId && !playlist.groups?.some((group) => group.id === command.groupId))
+          )
+            throw new Error('Группа не найдена')
+          const index = command.groupId
+            ? playlist.tracks.findIndex((track) => track.groupId === command.groupId)
+            : 0
+          const track = playlist.tracks[index]
+          if (!track) throw new Error('Группа пуста')
+          this.change('music', {
+            groupId: command.groupId,
+            trackIndex: index,
+            source: track.source,
+            desired: 'playing',
+            status: 'pending',
+            position: 0,
+            duration: null,
+          })
+          break
+        }
+        case 'track': {
+          const track = this.state.catalog.playlists.find((p) => p.id === c.playlistId)?.tracks[
+            command.trackIndex
+          ]
+          if (!track) throw new Error('Трек не найден')
+          c.groupId = track.groupId ?? 0
           this.track(command.trackIndex)
           break
+        }
         case 'next':
           this.advance()
           break
@@ -724,7 +796,8 @@ export class Controller {
     }
     if (report.status === 'error') {
       if (report.channel === 'music') this.overrideMusic()
-      c.desired = 'paused'
+      c.desired = report.channel === 'music' && c.groupId ? 'stopped' : 'paused'
+      if (report.channel === 'music' && c.groupId) c.position = 0
       if (report.channel === 'main' && [2, 4].includes(this.state.scene.mode)) {
         this.state.scene.status = 'error'
         this.state.scene.error = c.error
diff --git a/electron/main.ts b/electron/main.ts
index 261a318..5be1705 100644
--- a/electron/main.ts
+++ b/electron/main.ts
@@ -683,7 +683,7 @@ app
       const parsed = parseCommand(command)
       if (
         !output &&
-        ['play', 'pause', 'resume', 'stop', 'replay', 'seek', 'next'].includes(parsed.action)
+        ['play', 'pause', 'resume', 'stop', 'replay', 'seek', 'next', 'group'].includes(parsed.action)
       )
         throw new Error('Сначала откройте окно показа')
       if (parsed.session !== controller.state.session) return
diff --git a/electron/media-player.test.ts b/electron/media-player.test.ts
index 23c6e77..8eea2a8 100644
--- a/electron/media-player.test.ts
+++ b/electron/media-player.test.ts
@@ -498,3 +498,56 @@ for (const mode of [2, 4] as const) {
     assert.equal(media.volume, 0.8)
   })
 }
+
+for (const endMode of ['repeat', 'stop', 'next'] as const) {
+  test(`DOM: предзагрузка и окончание группы ${endMode}`, async (t) => {
+    const f = await fixture(t)
+    const playlist = f.c.state.catalog.playlists[0]!
+    playlist.groups = [
+      { id: 1, name: 'First', position: 0, endMode },
+      { id: 2, name: 'Final', position: 1, endMode: 'stop' },
+    ]
+    playlist.tracks[0]!.groupId = 1
+    playlist.tracks[1]!.groupId = 2
+    send(f.c, { action: 'group', channel: 'music', groupId: 1 })
+    f.apply()
+    await setImmediate()
+    const active = [f.a, f.b].find((media) => !media.paused)!
+    const spare = [f.a, f.b].find((media) => media !== active)!
+    assert.ok(active)
+    assert.equal(
+      spare.src,
+      endMode === 'stop' ? '' : playlist.tracks[endMode === 'next' ? 1 : 0]!.source.url,
+    )
+    active.finish()
+    f.c.report(f.reports.at(-1)!)
+    f.apply()
+    await setImmediate()
+    assert.equal(f.c.state.channels.music.groupId, endMode === 'next' ? 2 : 1)
+    assert.equal(f.c.state.channels.music.desired, endMode === 'stop' ? 'stopped' : 'playing')
+    assert.equal([f.a, f.b].filter((media) => !media.paused).length, endMode === 'stop' ? 0 : 1)
+  })
+}
+
+test('DOM: отсутствующий следующий файл останавливает выбранную группу с ошибкой', async (t) => {
+  const f = await fixture(t)
+  const playlist = f.c.state.catalog.playlists[0]!
+  playlist.groups = [{ id: 1, name: 'First', position: 0, endMode: 'repeat' }]
+  playlist.tracks[0]!.groupId = 1
+  playlist.tracks[1]!.groupId = 1
+  playlist.tracks[1]!.source.ready = false
+  send(f.c, { action: 'group', channel: 'music', groupId: 1 })
+  f.apply()
+  await setImmediate()
+  const active = [f.a, f.b].find((media) => !media.paused)!
+  active.finish()
+  f.c.report(f.reports.at(-1)!)
+  f.apply()
+  await setImmediate()
+  const failed = [f.a, f.b].find((media) => media.src === playlist.tracks[1]!.source.url)!
+  failed.dispatchEvent(new Event('error'))
+  assert.equal(f.reports.at(-1)!.status, 'error')
+  f.c.report(f.reports.at(-1)!)
+  assert.equal(f.c.state.channels.music.groupId, 1)
+  assert.equal(f.c.state.channels.music.desired, 'stopped')
+})
diff --git a/electron/music-groups.test.ts b/electron/music-groups.test.ts
new file mode 100644
index 0000000..cede8fd
--- /dev/null
+++ b/electron/music-groups.test.ts
@@ -0,0 +1,55 @@
+import assert from 'node:assert/strict'
+import { test } from 'node:test'
+import { nextMusicTrack } from '../src/utils/musicGroups.js'
+import { parsePlaylistGroups } from './playlist-groups.js'
+import type { MusicGroup } from '../src/types/screen.js'
+
+const groups: MusicGroup[] = [
+  { id: 1, name: 'First', position: 0, endMode: 'repeat' },
+  { id: 2, name: 'Empty', position: 1, endMode: 'repeat' },
+  { id: 3, name: 'Final', position: 2, endMode: 'stop' },
+]
+for (const tc of [
+  { name: 'within group', index: 0, groupId: 1, mode: 'stop', want: { index: 2, groupId: 1 } },
+  { name: 'repeat', index: 2, groupId: 1, mode: 'repeat', want: { index: 0, groupId: 1 } },
+  { name: 'stop overrides whole loop', index: 2, groupId: 1, mode: 'stop', want: null },
+  { name: 'skip empty', index: 2, groupId: 1, mode: 'next', want: { index: 1, groupId: 3 } },
+  { name: 'last stops', index: 1, groupId: 3, mode: 'repeat', want: null },
+  { name: 'whole playlist', index: 0, groupId: 0, mode: 'stop', want: { index: 1, groupId: 0 } },
+  {
+    name: 'whole playlist loops',
+    index: 2,
+    groupId: 0,
+    mode: 'stop',
+    want: { index: 0, groupId: 0 },
+  },
+] as const) {
+  test(`next music: ${tc.name}`, () => {
+    const playlist = {
+      tracks: [{ groupId: 1 }, { groupId: 3 }, { groupId: 1 }],
+      groups: groups.map((group) => (group.id === 1 ? { ...group, endMode: tc.mode } : group)),
+    }
+    assert.deepEqual(nextMusicTrack(playlist, tc.index, tc.groupId, true), tc.want)
+  })
+}
+test('group parser normalizes omitted repeat and sorts by position', () => {
+  assert.deepEqual(
+    parsePlaylistGroups([
+      { ID: 2, name: 'B', position: 5, endMode: 2 },
+      { ID: 1, name: 'A' },
+    ]).map((group) => [group.id, group.endMode]),
+    [
+      [1, 'repeat'],
+      [2, 'next'],
+    ],
+  )
+  for (const value of [
+    [{ ID: 1, name: 'A', endMode: 'unknown' }],
+    [
+      { ID: 1, name: 'A' },
+      { ID: 1, name: 'B' },
+    ],
+    [{ ID: 1, name: 'A', position: -1 }],
+  ])
+    assert.throws(() => parsePlaylistGroups(value))
+})
diff --git a/electron/online.test.ts b/electron/online.test.ts
index 699ce17..5e7c964 100644
--- a/electron/online.test.ts
+++ b/electron/online.test.ts
@@ -43,7 +43,12 @@ async function fixture(t: TestContext, secure = true) {
           { ID: 2, name: 'Два' },
         ],
       },
-    ],
+    ] as {
+      ID: number
+      name: string
+      groups?: { ID: number; name: string; position: number; endMode?: string }[]
+      tracks: { ID: number; name: string; groupId?: number }[]
+    }[],
     playlistError: 0,
     upload: null as { filename: string; data: Buffer } | null,
     bindings: [] as Record<string, unknown>[],
@@ -67,6 +72,7 @@ async function fixture(t: TestContext, secure = true) {
     refreshCalls: 0,
     refreshResponse: null as (() => Promise<Response>) | null,
     advanceCalls: 0,
+    advanceHandler: null as (() => Promise<Response>) | null,
     advanceRequest: null as Record<string, unknown> | null,
     advanceResponse: null as Record<string, unknown> | null,
     advanceError: 0,
@@ -144,6 +150,7 @@ async function fixture(t: TestContext, secure = true) {
     if (path === '/api/screens/music/advance') {
       model.advanceCalls++
       model.advanceRequest = JSON.parse(String(init?.body)) as Record<string, unknown>
+      if (model.advanceHandler) return model.advanceHandler()
       if (model.advanceError) return json({}, model.advanceError)
       return json({ state: model.advanceResponse ?? objectMusic(3, 1) })
     }
@@ -260,6 +267,8 @@ async function fixture(t: TestContext, secure = true) {
         const state = objectMusic(20, Number(body.trackIndex ?? 0))
         model.remote.music = {
           ...state,
+          playlist:
+            (model.remote.music as { playlist?: unknown } | undefined)?.playlist ?? state.playlist,
           playback: body.playback,
           volume: body.volume,
           loop: body.loop,
@@ -275,11 +284,13 @@ async function fixture(t: TestContext, secure = true) {
           {
             ID: 1,
             name: 'Музыка',
+            groups: model.library[0]?.groups,
             tracks: [0, 1].map((i) => ({
               ID: i + 1,
               name: `Трек ${i}`,
               filename: `https://media.test/${i}.wav`,
               position: i,
+              groupId: model.library[0]?.tracks.find((track) => track.ID === i + 1)?.groupId,
             })),
           },
         ],
@@ -311,6 +322,35 @@ async function fixture(t: TestContext, secure = true) {
       }
       if (path === '/api/playlists/1' && init?.method === 'PUT') model.library[0]!.name = data.name
       if (path === '/api/playlists/2' && init?.method === 'DELETE') model.library.pop()
+      const playlist = model.library[0]!
+      if (path === '/api/playlists/1/groups' && init?.method === 'POST') {
+        playlist.groups ??= []
+        const current = playlist.groups.find((group) => group.ID === data.groupID)
+        if (current) Object.assign(current, { name: data.name, endMode: data.endMode })
+        else
+          playlist.groups.push({
+            ID: Math.max(0, ...playlist.groups.map((group) => group.ID)) + 1,
+            name: data.name,
+            position: playlist.groups.length,
+            endMode: data.endMode,
+          })
+      }
+      if (path === '/api/playlists/1/groups/order') {
+        playlist.groups = data.groupIDs.map((id: number, position: number) => ({
+          ...playlist.groups!.find((group) => group.ID === id)!,
+          position,
+        }))
+      }
+      if (/^\/api\/playlists\/1\/groups\/\d+$/.test(path) && init?.method === 'DELETE') {
+        const groupId = Number(path.split('/').at(-1))
+        playlist.groups = playlist.groups?.filter((group) => group.ID !== groupId)
+        playlist.tracks.forEach((track) => {
+          if (track.groupId === groupId) delete track.groupId
+        })
+      }
+      if (/^\/api\/playlists\/1\/tracks\/\d+\/group$/.test(path))
+        playlist.tracks.find((track) => track.ID === Number(path.split('/')[5]))!.groupId =
+          data.groupID
       if (path === '/api/playlists/1/tracks/order') {
         const tracks = model.library[0]!.tracks
         model.library[0]!.tracks = data.trackIDs.map((id: number) =>
@@ -679,17 +719,26 @@ test('отмена подготовки не ждёт общий refresh и не
   }
   const cancelled = f.online.act({ action: 'check', gameId: 7 }).then(
     () => 'completed',
-    (error: Error) => { assert.match(error.message, /отмен|ABORTED/); return 'cancelled' },
+    (error: Error) => {
+      assert.match(error.message, /отмен|ABORTED/)
+      return 'cancelled'
+    },
   )
   await refreshStarted
   const background = f.online.refreshPlan()
   await new Promise<void>((resolve) => setImmediate(resolve))
   await f.online.act({ action: 'cancel' })
   try {
-    assert.equal(await Promise.race([
-      cancelled,
-      new Promise<string>((resolve) => { const timer = setTimeout(() => resolve('still waiting'), 1000); timer.unref() }),
-    ]), 'cancelled')
+    assert.equal(
+      await Promise.race([
+        cancelled,
+        new Promise<string>((resolve) => {
+          const timer = setTimeout(() => resolve('still waiting'), 1000)
+          timer.unref()
+        }),
+      ]),
+      'cancelled',
+    )
     assert.equal(f.model.refreshed, false)
   } finally {
     release()
@@ -2247,46 +2296,271 @@ test('список команд обновляется, сохраняется 
   assert.equal(c.state.teams, null)
 })
 
+function groupedMusic(version: number, index = 0, endMode = 'PLAYLIST_GROUP_END_MODE_REPEAT') {
+  return {
+    ...objectMusic(version, index),
+    groupId: index === 0 ? 42 : 43,
+    playlist: {
+      ID: 1,
+      name: 'Группы',
+      groups: [
+        { ID: 42, name: 'Сбор', position: 0, endMode },
+        { ID: 44, name: 'Пустая', position: 1 },
+        { ID: 43, name: 'Финал', position: 2, endMode: 'PLAYLIST_GROUP_END_MODE_STOP' },
+      ],
+      tracks: [0, 1].map((i) => ({
+        ID: i + 1,
+        name: `Трек ${i}`,
+        filename: `https://media.test/${i}.wav`,
+        position: i,
+        groupId: i === 0 ? 42 : 43,
+      })),
+    },
+  }
+}
+
 for (const action of ['volume', 'pause', 'resume', 'replay'] as const) {
   test(`группа сохраняется при команде ${action} нативного плеера`, async (t) => {
     const f = await fixture(t)
+    const music = groupedMusic(2)
+    f.model.musicOverride = { gamePlaylistId: 1, playlists: [music.playlist] }
+    f.model.remote.music = music
     await f.prepare()
     f.controller.output(true)
-    f.model.remote.music = { ...objectMusic(2), groupId: 42 }
     await f.online.poll()
     await f.online.planCommand(action === 'volume' ? { action, channel: 'music', volume: 55 } : { action, channel: 'music' })
     assert.equal((f.model.remote.music as { groupId: number }).groupId, 42)
-    await assert.rejects(f.online.planCommand({ action: 'next', channel: 'music' }), /активной группы/)
-    await assert.rejects(f.online.planCommand({ action: 'track', channel: 'music', trackIndex: 1 }), /активной группы/)
-    await assert.rejects(f.online.planCommand({ action: 'loop', channel: 'music', enabled: true }), /активной группы/)
+    await assert.rejects(
+      f.online.planCommand({ action: 'loop', channel: 'music', enabled: true }),
+      /редакторе/,
+    )
+    await f.online.planCommand({ action: 'track', channel: 'music', trackIndex: 1 })
+    assert.equal(f.controller.state.channels.music.groupId, 43)
   })
 }
 
 test('повтор одного трека группы передаёт точную версию и перезапускает трек', async (t) => {
   const f = await fixture(t)
+  const music = { ...groupedMusic(2), stateVersion: '9007199254740995', positionMs: 0 }
+  f.model.musicOverride = { gamePlaylistId: 1, playlists: [music.playlist] }
+  f.model.remote.music = music
   await f.prepare()
   f.controller.output(true)
-  const version = '9007199254740995'
-  f.model.remote.music = { ...objectMusic(2), stateVersion: version, groupId: 42, positionMs: 0 }
   await f.online.poll()
   send(f.controller, { action: 'play', channel: 'music' })
   const before = f.controller.state.channels.music.operation
-  f.model.advanceResponse = { ...objectMusic(3), stateVersion: '9007199254740996', groupId: 42, positionMs: 0 }
-  await f.online.musicEnded({ session: f.controller.state.session, channel: 'music', operation: before, status: 'ended', position: 0.1, duration: 0.1 })
-  assert.equal(f.model.advanceRequest?.expectedStateVersion, version)
+  f.model.advanceResponse = { ...groupedMusic(3), stateVersion: '9007199254740996', positionMs: 0 }
+  await f.online.musicEnded({
+    session: f.controller.state.session,
+    channel: 'music',
+    operation: before,
+    status: 'ended',
+    position: 0.1,
+    duration: 0.1,
+  })
+  assert.equal(f.model.advanceRequest?.expectedStateVersion, music.stateVersion)
   assert.ok(f.controller.state.channels.music.operation > before)
-  assert.equal(f.controller.state.channels.music.trackIndex, 0)
+  assert.equal(f.controller.state.channels.music.groupId, 42)
 })
 
-test('группа останавливается при потере связи вместо выхода в общий список', async (t) => {
+for (const [mode, index, groupId, desired] of [
+  ['PLAYLIST_GROUP_END_MODE_REPEAT', 0, 42, 'playing'],
+  ['PLAYLIST_GROUP_END_MODE_STOP', 0, 42, 'stopped'],
+  ['PLAYLIST_GROUP_END_MODE_NEXT', 1, 43, 'playing'],
+] as const) {
+  test(`офлайн-завершение группы: ${mode}`, async (t) => {
+    const f = await fixture(t)
+    const music = groupedMusic(2, 0, mode)
+    f.model.musicOverride = { gamePlaylistId: 1, playlists: [music.playlist] }
+    f.model.remote.music = music
+    await f.prepare()
+    f.controller.output(true)
+    await f.online.poll()
+    send(f.controller, { action: 'play', channel: 'music' })
+    f.model.advanceError = 503
+    await f.online.musicEnded({
+      session: f.controller.state.session,
+      channel: 'music',
+      operation: f.controller.state.channels.music.operation,
+      status: 'ended',
+      position: 4,
+      duration: 4,
+    })
+    assert.equal(f.controller.state.channels.music.desired, desired)
+    assert.equal(f.controller.state.channels.music.groupId, groupId)
+    assert.equal(f.controller.state.channels.music.trackIndex, index)
+    await f.online.poll()
+    assert.equal(
+      f.controller.state.channels.music.groupId,
+      42,
+      'server wins on reconnect even with unchanged music version',
+    )
+    assert.equal(f.controller.state.channels.music.trackIndex, 0)
+  })
+}
+
+test('редактор сохраняет группы и переносит треки через существующие API', async (t) => {
   const f = await fixture(t)
+  await f.login()
+  await f.online.act({
+    action: 'group-save',
+    playlistId: 1,
+    groupId: 0,
+    name: 'Сбор',
+    endMode: 'repeat',
+  })
+  await f.online.act({
+    action: 'group-save',
+    playlistId: 1,
+    groupId: 0,
+    name: 'Финал',
+    endMode: 'stop',
+  })
+  const groups = f.online.snapshot().playlists[0]!.groups!
+  assert.deepEqual(
+    groups.map((g) => g.endMode),
+    ['repeat', 'stop'],
+  )
+  await f.online.act({ action: 'track-group', playlistId: 1, trackId: 1, groupId: groups[0]!.id })
+  assert.equal(f.online.snapshot().playlists[0]!.tracks[0]!.groupId, groups[0]!.id)
+  await f.online.act({
+    action: 'group-reorder',
+    playlistId: 1,
+    groupIds: [groups[1]!.id, groups[0]!.id],
+  })
+  assert.equal(f.online.snapshot().playlists[0]!.groups![0]!.name, 'Финал')
+  await f.online.act({
+    action: 'group-save',
+    playlistId: 1,
+    groupId: groups[0]!.id,
+    name: 'Гости',
+    endMode: 'next',
+  })
+  assert.equal(f.online.snapshot().playlists[0]!.groups![1]!.endMode, 'next')
+  await f.online.act({ action: 'group-delete', playlistId: 1, groupId: groups[0]!.id })
+  assert.equal(f.online.snapshot().playlists[0]!.tracks[0]!.groupId, undefined)
+  assert.equal(f.online.snapshot().playlists[0]!.tracks.length, 2)
+})
+
+test('запоздалая ошибка подготовки группы не останавливает новую группу', async (t) => {
+  const f = await fixture(t)
+  const music = groupedMusic(2)
+  f.model.musicOverride = { gamePlaylistId: 1, playlists: [music.playlist] }
+  f.model.remote.music = music
+  await f.prepare()
+  f.controller.output(true)
+  await f.online.poll()
+  const pkg = f.store.description(f.store.list()[0]!.key)!.package
+  const target = pkg.playlists[0]!.tracks[0]!.assetId
+  const canRead = f.store.canRead.bind(f.store),
+    ensure = f.store.ensureAsset.bind(f.store)
+  let reject!: (error: Error) => void,
+    started = false,
+    shouldDefer = true
+  const pending = new Promise<void>((_resolve, failure) => {
+    reject = failure
+  })
+  f.store.canRead = (key, id) => (id === target && shouldDefer ? false : canRead(key, id))
+  f.store.ensureAsset = (...args) => {
+    if (args[1] === target && shouldDefer) {
+      shouldDefer = false
+      started = true
+      return pending
+    }
+    return ensure(...args)
+  }
+  f.model.offline = true
+  const old = f.online.planCommand({ action: 'group', channel: 'music', groupId: 42 })
+  await eventually(() => started, 'старая загрузка началась')
+  await f.online.planCommand({ action: 'group', channel: 'music', groupId: 43 })
+  const operation = f.controller.state.channels.music.operation
+  reject(new Error('old preparation failure'))
+  await old
+  assert.equal(f.controller.state.channels.music.groupId, 43)
+  assert.equal(f.controller.state.channels.music.desired, 'playing')
+  assert.equal(f.controller.state.channels.music.operation, operation)
+})
+
+test('запоздалая ошибка офлайн-перехода не останавливает новый запуск', async (t) => {
+  const f = await fixture(t)
+  const music = groupedMusic(2, 0, 'PLAYLIST_GROUP_END_MODE_NEXT')
+  f.model.musicOverride = { gamePlaylistId: 1, playlists: [music.playlist] }
+  f.model.remote.music = music
   await f.prepare()
   f.controller.output(true)
-  f.model.remote.music = { ...objectMusic(2), groupId: 42 }
   await f.online.poll()
   send(f.controller, { action: 'play', channel: 'music' })
+  const pkg = f.store.description(f.store.list()[0]!.key)!.package
+  const target = pkg.playlists[0]!.tracks[1]!.assetId
+  const ensure = f.store.ensureAsset.bind(f.store)
+  let reject!: (error: Error) => void,
+    started = false,
+    shouldDefer = true
+  const pending = new Promise<void>((_resolve, failure) => {
+    reject = failure
+  })
+  f.store.ensureAsset = (...args) => {
+    if (args[1] === target && shouldDefer) {
+      shouldDefer = false
+      started = true
+      return pending
+    }
+    return ensure(...args)
+  }
   f.model.advanceError = 503
-  await f.online.musicEnded({ session: f.controller.state.session, channel: 'music', operation: f.controller.state.channels.music.operation, status: 'ended', position: 4, duration: 4 })
-  assert.equal(f.controller.state.channels.music.desired, 'stopped')
-  assert.equal(f.controller.state.channels.music.trackIndex, 0)
+  const old = f.online.musicEnded({
+    session: f.controller.state.session,
+    channel: 'music',
+    operation: f.controller.state.channels.music.operation,
+    status: 'ended',
+    position: 4,
+    duration: 4,
+  })
+  await eventually(() => started, 'офлайн-переход готовит файл')
+  await f.online.planCommand({ action: 'group', channel: 'music', groupId: 42 })
+  const operation = f.controller.state.channels.music.operation
+  reject(new Error('old next failure'))
+  await old
+  assert.equal(f.controller.state.channels.music.groupId, 42)
+  assert.equal(f.controller.state.channels.music.desired, 'playing')
+  assert.equal(f.controller.state.channels.music.operation, operation)
+  assert.equal(f.online.snapshot().connection, 'connected')
+})
+
+test('ожидающее окончание старой группы не блокирует окончание новой короткой группы', async (t) => {
+  const f = await fixture(t); const music = groupedMusic(2)
+  f.model.musicOverride = { gamePlaylistId: 1, playlists: [music.playlist] }; f.model.remote.music = music
+  await f.prepare(); f.controller.output(true); await f.online.poll()
+  send(f.controller, { action: 'play', channel: 'music' })
+  let resolve!: (response: Response) => void
+  const pending = new Promise<Response>((done) => { resolve = done })
+  let calls = 0
+  f.model.advanceHandler = () => ++calls === 1 ? pending : Promise.resolve(Response.json({ state: { ...groupedMusic(21, 1), playback: 'MUSIC_PLAYBACK_STOPPED', positionMs: 0 } }))
+  const report = () => ({ session: f.controller.state.session, channel: 'music' as const, operation: f.controller.state.channels.music.operation, status: 'ended' as const, position: .1, duration: .1 })
+  const old = f.online.musicEnded(report())
+  await eventually(() => calls === 1, 'старый RPC ожидает ответа')
+  await f.online.planCommand({ action: 'group', channel: 'music', groupId: 43 })
+  await f.online.musicEnded(report())
+  assert.equal(calls, 2)
+  assert.equal(f.controller.state.channels.music.groupId, 43)
+  assert.equal(f.controller.state.channels.music.desired, 'stopped')
+  resolve(Response.json({ state: groupedMusic(3) })); await old
+  assert.equal(f.controller.state.channels.music.groupId, 43)
+  assert.equal(f.controller.state.channels.music.desired, 'stopped')
+})
+
+test('группа без подготовленного локального описания не продолжает общий плейлист', async (t) => {
+  const f = await fixture(t)
+  await f.prepare(); f.controller.output(true); await f.online.poll()
+  send(f.controller, { action: 'play', channel: 'music' })
+  assert.equal(f.controller.state.channels.music.groupId, 0)
+  f.model.remote.music = groupedMusic(2)
+  await f.online.poll()
+  assert.equal(f.controller.state.channels.music.desired, 'stopped')
+  assert.match(f.online.snapshot().preparation.error, /Группа/)
+  f.model.offline = true
+  await f.online.poll()
+  await f.online.musicEnded({ session: f.controller.state.session, channel: 'music', operation: f.controller.state.channels.music.operation, status: 'ended', position: 4, duration: 4 })
+  assert.equal(f.controller.state.channels.music.trackIndex, 0)
+  assert.equal(f.model.advanceCalls, 0)
 })
diff --git a/electron/online.ts b/electron/online.ts
index 2d90d41..7799956 100644
--- a/electron/online.ts
+++ b/electron/online.ts
@@ -1,3 +1,5 @@
+import { nextMusicTrack } from '../src/utils/musicGroups.js'
+import { parsePlaylistGroups, apiGroupEndMode } from './playlist-groups.js'
 import { requestErrorContext } from './request-error.js'
 import { createEveningDetectiveServerClient } from './api/generated/crabs/evening_detective_server/index.js'
 import { apiScreenMode, apiScreenCommand, apiPlan, apiTimerType } from './api-values.js'
@@ -369,6 +371,7 @@ export class Online {
       const channel = this.controller.state.channels.music
       return (
         next.music?.playlistId === channel.playlistId &&
+        next.music?.groupId === channel.groupId &&
         (id ? `screen-app://app/packages/${this.selectedGame()?.key}/${id}` : undefined) ===
           channel.source?.url
       )
@@ -461,9 +464,17 @@ export class Online {
         if (next.command === 0) this.controller.markStep(this.plan.currentStep)
       }
     } catch (error) {
-      if (generation === this.generation && !this.materialAbort.signal.aborted)
-        this.state.preparation.error =
-          error instanceof Error ? error.message : 'Материал не подготовлен'
+      if (
+        generation === this.generation &&
+        session === this.controller.state.session &&
+        version === this.planVersion &&
+        !this.materialAbort.signal.aborted
+      ) {
+        const current = this.controller.state.channels.music
+        if (music && next.music && next.music.groupId !== current.groupId && current.source && this.received?.music?.version === next.music.version)
+          send(this.controller, { action: 'stop', channel: 'music' })
+        this.state.preparation.error = error instanceof Error ? error.message : 'Материал не подготовлен'
+      }
     }
   }
   private synchronize() {
@@ -490,7 +501,7 @@ export class Online {
   private teamsBusy = false
   private lastResults = -Infinity
   private resultsBusy = false
-  private advanceBusy = false
+  private musicAdvance: { session: string; operation: number } | null = null
   private plan: ScreenPlan = { steps: [], currentStep: 0 }
   private planBusy = 0
   private planCommands: Promise<boolean> = Promise.resolve(true)
@@ -603,8 +614,12 @@ export class Online {
           : intent.action === 'playlist'
             ? 0
             : channel.trackIndex
+      if (intent.action === 'group' && playlist)
+        index = intent.groupId
+          ? playlist.tracks.findIndex((track) => track.groupId === intent.groupId)
+          : 0
       if (intent.action === 'next' && playlist)
-        index = (index + 1) % Math.max(1, playlist.tracks.length)
+        index = nextMusicTrack(playlist, index, channel.groupId, channel.loop)?.index ?? -1
       const track = playlist?.tracks[index]
       return track ? [track.assetId] : []
     }
@@ -624,14 +639,13 @@ export class Online {
   async planCommand(intent: Intent) {
     if (this.busy) throw new Error('Подождите завершения текущего действия')
     const pkg = this.selectedGame()
-    const activeMusic = this.received?.music
-    // shortcut: native track navigation and completion controls have no group catalogue; use website group controls until it does.
     if (
-      activeMusic?.groupId &&
-      'channel' in intent && intent.channel === 'music' &&
-      (intent.action === 'next' || intent.action === 'track' || intent.action === 'loop')
+      'channel' in intent &&
+      intent.channel === 'music' &&
+      intent.action === 'loop' &&
+      this.controller.state.channels.music.groupId
     )
-      throw new Error('Треки и режим завершения активной группы меняются через сайт. Для обычного списка выберите весь плейлист.')
+      throw new Error('Режим завершения группы меняется в редакторе')
     const localVersion = ++this.localCommandVersion
     const localGeneration = this.generation
     const localSession = this.controller.state.session
@@ -641,9 +655,25 @@ export class Online {
         this.controller.state.scene.status === 'error' ||
         ('channel' in intent && this.controller.state.channels[intent.channel].status === 'error')
       if (hasError || ids.some((id) => !this.packages.canRead(pkg.key, id))) {
-        await Promise.all(
-          ids.map((id) => this.packages.ensureAsset(pkg.package, id, this.materialAbort.signal)),
-        )
+        try {
+          await Promise.all(
+            ids.map((id) => this.packages.ensureAsset(pkg.package, id, this.materialAbort.signal)),
+          )
+        } catch (error) {
+          if (
+            localVersion !== this.localCommandVersion ||
+            localGeneration !== this.generation ||
+            localSession !== this.controller.state.session
+          )
+            return
+          if (
+            'channel' in intent &&
+            intent.channel === 'music' &&
+            (intent.action === 'group' || this.controller.state.channels.music.groupId)
+          )
+            send(this.controller, { action: 'stop', channel: 'music' })
+          throw error
+        }
         if (
           localVersion !== this.localCommandVersion ||
           localGeneration !== this.generation ||
@@ -679,9 +709,18 @@ export class Online {
       if (generation !== this.generation || session !== this.controller.state.session) return
       if (
         version !== this.planVersion &&
-        ['step', 'mode', 'text', 'qr', 'select', 'timer-set', 'playlist', 'track', 'next'].includes(
-          intent.action,
-        )
+        [
+          'step',
+          'mode',
+          'text',
+          'qr',
+          'select',
+          'timer-set',
+          'playlist',
+          'track',
+          'next',
+          'group',
+        ].includes(intent.action)
       )
         return
       if (hasPendingCommand && !wasAvailable) {
@@ -715,7 +754,7 @@ export class Online {
         await this.client(true, AbortSignal.timeout(5000)).SetGameMusic({
           gameID: pkg.package.game.id,
           playlistID: c.playlistId ?? 0,
-          groupId: c.playlistId === activeMusic?.playlistId ? activeMusic.groupId : 0,
+          groupId: c.groupId,
           trackIndex: c.trackIndex,
           positionMs: Math.max(0, Math.round(c.position * 1000)),
           volume: Math.round(c.volume),
@@ -876,6 +915,8 @@ export class Online {
           remote.music?.playlistId,
           remote.music?.trackIds,
           remote.music?.filenames,
+          remote.music?.groups,
+          remote.music?.trackGroupIds,
         ])
         if (!('channel' in intent && intent.channel === 'music')) {
           if (needsMainSync) {
@@ -897,6 +938,7 @@ export class Online {
             m.playlistId === c.playlistId &&
             this.musicSourceMatches(remote) &&
             m.trackId === expectedTrack &&
+            m.groupId === c.groupId &&
             m.volume === Math.round(c.volume) &&
             m.loop === c.loop &&
             m.playback === (c.desired === 'playing' ? 2 : c.desired === 'paused' ? 3 : 1) &&
@@ -921,6 +963,8 @@ export class Online {
       this.previous = null
       this.planNotice = 'Команда выполнена локально; сервер не подтвердил обновление'
       if (!(error instanceof NetworkError)) throw error
+      if ('channel' in intent && intent.channel === 'music') this.musicApplied = null
+      this.state.connection = 'offline'
     } finally {
       this.planBusy--
       complete(isAvailable)
@@ -1302,6 +1346,10 @@ export class Online {
       'playlist-use': 'Подключение плейлиста к игре…',
       'playlist-track-delete': 'Удаление трека…',
       'playlist-reorder': 'Сохранение порядка треков…',
+      'group-save': 'Сохранение группы…',
+      'group-delete': 'Удаление группы…',
+      'group-reorder': 'Сохранение порядка групп…',
+      'track-group': 'Перенос трека…',
       'plan-save': 'Сохранение плана экранов…',
       'plan-refresh': 'Загрузка плана экранов…',
       login: 'Вход на сервер…',
@@ -1364,6 +1412,10 @@ export class Online {
       case 'playlist-upload':
       case 'playlist-track-delete':
       case 'playlist-reorder':
+      case 'group-save':
+      case 'group-delete':
+      case 'group-reorder':
+      case 'track-group':
       case 'playlist-use':
         return this.editPlaylist(data)
       case 'plan-save':
@@ -1626,12 +1678,17 @@ export class Online {
     this.state.playlists = (result.playlists ?? []).map((value) => {
       const p = object(value)
       if (!Array.isArray(p.tracks ?? [])) throw new Error('Некорректный список треков')
+      const groups = parsePlaylistGroups(p.groups)
       return {
         id: integer(p.ID, 1),
         name: text(p.name),
+        ...(groups.length ? { groups } : {}),
         tracks: ((p.tracks ?? []) as unknown[]).map((value) => {
           const t = object(value)
-          return { id: integer(t.ID, 1), name: text(t.name) }
+          const groupId = integer(t.groupId ?? 0, 0, 2147483647)
+          if (groupId && !groups.some((group) => group.id === groupId))
+            throw new Error('Группа трека не найдена')
+          return { id: integer(t.ID, 1), name: text(t.name), ...(groupId ? { groupId } : {}) }
         }),
       }
     })
@@ -1646,6 +1703,34 @@ export class Online {
       if (!name || Buffer.byteLength(name) > 255) throw new Error('Имя плейлиста: от 1 до 255 байт')
       if (data.action === 'playlist-create') await client.CreatePlaylist({ name })
       else await client.UpdatePlaylist({ ID: id, name })
+    } else if (data.action === 'group-save') {
+      const name = text(data.name).trim()
+      if (!name || Buffer.byteLength(name) > 255) throw new Error('Имя группы: от 1 до 255 байт')
+      const endMode = text(data.endMode)
+      if (endMode !== 'repeat' && endMode !== 'stop' && endMode !== 'next')
+        throw new Error('Некорректный режим группы')
+      await client.SavePlaylistGroup({
+        playlistID: id,
+        groupID: integer(data.groupId, 0, 2147483647),
+        name,
+        endMode: apiGroupEndMode(endMode),
+      })
+    } else if (data.action === 'group-delete') {
+      await client.DeletePlaylistGroup({
+        playlistID: id,
+        groupID: integer(data.groupId, 1, 2147483647),
+      })
+    } else if (data.action === 'group-reorder') {
+      if (!Array.isArray(data.groupIds)) throw new Error('Некорректный порядок групп')
+      const ids = data.groupIds.map((value) => integer(value, 1, 2147483647))
+      if (new Set(ids).size !== ids.length) throw new Error('Группы не должны повторяться')
+      await client.ReorderPlaylistGroups({ playlistID: id, groupIDs: ids })
+    } else if (data.action === 'track-group') {
+      await client.SetPlaylistTrackGroup({
+        playlistID: id,
+        trackID: integer(data.trackId, 1, 2147483647),
+        groupID: integer(data.groupId, 0, 2147483647),
+      })
     } else if (data.action === 'playlist-delete') await client.DeletePlaylist({ ID: id })
     else if (data.action === 'playlist-track-delete')
       await client.DeletePlaylistTrack({
@@ -1690,6 +1775,7 @@ export class Online {
         playback: 'MUSIC_PLAYBACK_STOPPED',
       })
     }
+    if (generation !== this.generation) throw new SessionChangedError()
     await this.loadPlaylists()
     this.lastMaterials = -Infinity
     await this.refreshMaterials()
@@ -1855,6 +1941,8 @@ export class Online {
         next.music?.playlistId,
         next.music?.trackIds,
         next.music?.filenames,
+        next.music?.groups,
+        next.music?.trackGroupIds,
       ])
       this.state.soundEnabled = next.sound
       if (this.lastSound !== next.sound)
@@ -1896,14 +1984,15 @@ export class Online {
   async musicEnded(report: Report) {
     const c = this.controller.state.channels.music
     if (
-      this.advanceBusy ||
+      (this.musicAdvance?.session === report.session && this.musicAdvance.operation === report.operation) ||
       report.session !== this.controller.state.session ||
       report.operation !== c.operation ||
       c.desired !== 'playing'
     )
       return
     const generation = this.generation
-    this.advanceBusy = true
+    const advance = { session: report.session, operation: report.operation }
+    this.musicAdvance = advance
     try {
       if (!this.screen || this.state.connection !== 'connected') throw new NetworkError('Нет связи')
       if (this.received && !this.musicSourceMatches(this.received)) {
@@ -1915,7 +2004,12 @@ export class Online {
         accessToken: this.screen.token,
         expectedStateVersion: this.received?.music?.version.toString(),
       })
-      if (generation !== this.generation || report.session !== this.controller.state.session) return
+      if (
+        generation !== this.generation ||
+        report.session !== this.controller.state.session ||
+        report.operation !== this.controller.state.channels.music.operation
+      )
+        return
       const music = parseRemote({ music: result.state }).music
       if (this.received) {
         if (music && this.received.music && music.version > this.received.music.version && music.trackId === this.received.music.trackId)
@@ -1924,20 +2018,35 @@ export class Online {
         await this.applyReceived(true)
       }
     } catch (error) {
-      if (generation !== this.generation || report.session !== this.controller.state.session) return
+      if (
+        generation !== this.generation ||
+        report.session !== this.controller.state.session ||
+        report.operation !== this.controller.state.channels.music.operation
+      )
+        return
+      this.musicApplied = null
       const pkg = this.selectedGame()?.package
       const playlist = pkg?.playlists.find((p) => p.id === c.playlistId)
-      if (this.received?.music?.groupId) {
-        send(this.controller, { action: 'stop', channel: 'music' })
-      } else if (pkg && playlist) {
-        const nextIndex = c.trackIndex + 1
-        const track =
-          playlist.tracks[nextIndex < playlist.tracks.length ? nextIndex : c.loop ? 0 : -1]
+      if (pkg && playlist) {
+        const next = nextMusicTrack(playlist, c.trackIndex, c.groupId, c.loop)
+        const track = next ? playlist.tracks[next.index] : undefined
         try {
           if (track) await this.packages.ensureAsset(pkg, track.assetId, this.materialAbort.signal)
-          if (generation === this.generation && report.session === this.controller.state.session)
-            send(this.controller, { action: 'next', channel: 'music' })
+          if (
+            generation !== this.generation ||
+            report.session !== this.controller.state.session ||
+            report.operation !== this.controller.state.channels.music.operation
+          )
+            return
+          send(this.controller, { action: 'next', channel: 'music' })
         } catch (failure) {
+          if (
+            generation !== this.generation ||
+            report.session !== this.controller.state.session ||
+            report.operation !== this.controller.state.channels.music.operation
+          )
+            return
+          send(this.controller, { action: 'stop', channel: 'music' })
           this.state.preparation.error =
             failure instanceof Error ? failure.message : 'Следующий трек недоступен'
         }
@@ -1946,7 +2055,7 @@ export class Online {
       this.state.error =
         error instanceof Error ? error.message : 'Сервер не подтвердил переход музыки'
     } finally {
-      this.advanceBusy = false
+      if (this.musicAdvance === advance) this.musicAdvance = null
     }
   }
   async close() {
diff --git a/electron/playlist-groups.ts b/electron/playlist-groups.ts
new file mode 100644
index 0000000..e079351
--- /dev/null
+++ b/electron/playlist-groups.ts
@@ -0,0 +1,65 @@
+import type { MusicGroup } from '../src/types/screen.js'
+import { fieldError } from './request-error.js'
+
+export function groupEndMode(value: unknown): MusicGroup['endMode'] {
+  if (value == null || value === 0 || value === 'PLAYLIST_GROUP_END_MODE_REPEAT') return 'repeat'
+  if (value === 1 || value === 'PLAYLIST_GROUP_END_MODE_STOP') return 'stop'
+  if (value === 2 || value === 'PLAYLIST_GROUP_END_MODE_NEXT') return 'next'
+  throw fieldError('groups.endMode', 'режим завершения группы', value, 'Некорректный режим группы')
+}
+
+export function apiGroupEndMode(value: MusicGroup['endMode']) {
+  return value === 'stop'
+    ? ('PLAYLIST_GROUP_END_MODE_STOP' as const)
+    : value === 'next'
+      ? ('PLAYLIST_GROUP_END_MODE_NEXT' as const)
+      : ('PLAYLIST_GROUP_END_MODE_REPEAT' as const)
+}
+
+export function parsePlaylistGroups(value: unknown): MusicGroup[] {
+  if (value == null) return []
+  if (!Array.isArray(value))
+    throw fieldError('groups', 'массив', value, 'Некорректный список групп')
+  const seen = new Set<number>()
+  return value
+    .map((raw, index) => {
+      if (!raw || typeof raw !== 'object' || Array.isArray(raw))
+        throw fieldError(`groups[${index}]`, 'объект', raw, 'Некорректная группа')
+      const group = raw as Record<string, unknown>
+      if (!Number.isSafeInteger(group.ID) || Number(group.ID) <= 0 || seen.has(Number(group.ID)))
+        throw fieldError(
+          `groups[${index}].ID`,
+          'уникальный положительный ID',
+          group.ID,
+          'Некорректная группа',
+        )
+      if (
+        typeof group.name !== 'string' ||
+        !group.name.trim() ||
+        Buffer.byteLength(group.name) > 255
+      )
+        throw fieldError(
+          `groups[${index}].name`,
+          'название группы',
+          group.name,
+          'Некорректная группа',
+        )
+      const position = group.position ?? 0
+      if (!Number.isSafeInteger(position) || Number(position) < 0)
+        throw fieldError(
+          `groups[${index}].position`,
+          'неотрицательное целое',
+          position,
+          'Некорректный порядок групп',
+        )
+      const id = Number(group.ID)
+      seen.add(id)
+      return {
+        id,
+        name: group.name,
+        position: Number(position),
+        endMode: groupEndMode(group.endMode),
+      }
+    })
+    .sort((a, b) => a.position - b.position || a.id - b.id)
+}
diff --git a/electron/remote-state.ts b/electron/remote-state.ts
index 2827d4a..7348728 100644
--- a/electron/remote-state.ts
+++ b/electron/remote-state.ts
@@ -1,3 +1,5 @@
+import { parsePlaylistGroups } from './playlist-groups.js'
+import type { MusicGroup } from '../src/types/screen.js'
 import { parseTimerType } from './screen-plan.js'
 import { timerLabels, validQR } from '../src/utils/presentation.js'
 import type { TimerType } from '../src/types/screen.js'
@@ -82,6 +84,8 @@ export interface RemoteState {
     groupId: number
     trackId: number | null
     trackIds: number[]
+    groups: MusicGroup[]
+    trackGroupIds: number[]
     filenames: string[]
     position: number
     volume: number
@@ -161,6 +165,15 @@ export function parseRemote(value: unknown): RemoteState {
       playlistId: p ? integer(p.ID, 1, Number.MAX_SAFE_INTEGER, 'state.music.playlist.ID') : null,
       trackId: trackIds[index] ?? null,
       trackIds,
+      groups: parsePlaylistGroups(p?.groups),
+      trackGroupIds: tracks.map((track, i) =>
+        integer(
+          object(track).groupId ?? 0,
+          0,
+          Number.MAX_SAFE_INTEGER,
+          `state.music.playlist.tracks[${i}].groupId`,
+        ),
+      ),
       filenames: tracks.map((t, i) =>
         text(object(t).filename ?? '', `state.music.playlist.tracks[${i}].filename`),
       ),
@@ -300,6 +313,7 @@ function applyRemoteState(controller: Controller, previous: RemoteState, next: R
     !old ||
     old.playlistId !== m.playlistId ||
     old.trackId !== m.trackId ||
+    old.groupId !== m.groupId ||
     old.playback !== m.playback ||
     old.position !== m.position
   if (transportChanged) {
@@ -312,6 +326,7 @@ function applyRemoteState(controller: Controller, previous: RemoteState, next: R
     )
       send(controller, { action: 'track', channel: 'music', trackIndex: index })
   }
+  controller.synchronizeMusicGroup(m.groupId)
   send(controller, { action: 'volume', channel: 'music', volume: m.volume })
   send(controller, { action: 'loop', channel: 'music', enabled: m.loop })
   if (transportChanged) {
diff --git a/electron/screen-package.test.ts b/electron/screen-package.test.ts
index a6d0190..6fc37cb 100644
--- a/electron/screen-package.test.ts
+++ b/electron/screen-package.test.ts
@@ -501,3 +501,68 @@ test('ссылки состояния экрана определяют меди
   assert.equal(coverOnly.media.background, null)
   for (const value of [pkg, cleared, coverOnly]) assert.deepEqual(parseScreenPackage(value), value)
 })
+
+test('группы сохраняются в пакете и его отпечатке, старые пакеты остаются совместимыми', () => {
+  const legacy = build()
+  assert.ok(
+    legacy.playlists.every(
+      (playlist) =>
+        !('groups' in playlist) && playlist.tracks.every((track) => !('groupId' in track)),
+    ),
+  )
+  assert.deepEqual(parseScreenPackage(JSON.parse(JSON.stringify(legacy))), legacy)
+  const data = fixture()
+  const selected = data.music.state.playlist
+  const playlist = {
+    ...selected,
+    groups: [
+      { ID: 42, name: 'First', position: 1 },
+      { ID: 43, name: 'Final', position: 0, endMode: 'PLAYLIST_GROUP_END_MODE_STOP' },
+    ],
+    tracks: selected.tracks.map((track) => ({ ...track, groupId: 42 })),
+  }
+  const grouped = buildScreenPackage(server, 7, {
+    ...data,
+    music: { ...data.music, state: { ...data.music.state, playlist } },
+  })
+  assert.notEqual(grouped.metadataVersion, legacy.metadataVersion)
+  assert.deepEqual(parseScreenPackage(JSON.parse(JSON.stringify(grouped))), grouped)
+  assert.deepEqual(
+    grouped.playlists.find((p) => p.id === 3)!.groups!.map((group) => [group.id, group.endMode]),
+    [
+      [43, 'stop'],
+      [42, 'repeat'],
+    ],
+  )
+  const renamed = buildScreenPackage(server, 7, {
+    ...data,
+    music: {
+      ...data.music,
+      state: {
+        ...data.music.state,
+        playlist: {
+          ...playlist,
+          groups: playlist.groups.map((group) => ({ ...group, name: group.name + ' changed' })),
+        },
+      },
+    },
+  })
+  assert.notEqual(renamed.metadataVersion, grouped.metadataVersion)
+  assert.throws(
+    () =>
+      buildScreenPackage(server, 7, {
+        ...data,
+        music: {
+          ...data.music,
+          state: {
+            ...data.music.state,
+            playlist: {
+              ...playlist,
+              tracks: playlist.tracks.map((track) => ({ ...track, groupId: 999 })),
+            },
+          },
+        },
+      }),
+    /Группа/,
+  )
+})
diff --git a/electron/screen-package.ts b/electron/screen-package.ts
index c7d6f5d..ab2fc4d 100644
--- a/electron/screen-package.ts
+++ b/electron/screen-package.ts
@@ -10,6 +10,8 @@ import { parseTimerType } from './screen-plan.js'
 import { validQR } from '../src/utils/presentation.js'
 import type { TimerType } from '../src/types/screen.js'
 import { createHash } from 'node:crypto'
+import type { MusicGroup } from '../src/types/screen.js'
+import { parsePlaylistGroups, apiGroupEndMode } from './playlist-groups.js'
 
 export const INCOMPLETE_MATERIALS_WARNING = 'Получен неполный список материалов. Подключите экран к игре для уточнения'
 
@@ -24,7 +26,14 @@ export interface ScreenPackage {
     intro: string | null
     conclusion: string | null
   }
-  steps: { mode: number; text: string; timerLabel: string; timerDurationSeconds: number; qrUrl?: string; timerType?: TimerType }[]
+  steps: {
+    mode: number
+    text: string
+    timerLabel: string
+    timerDurationSeconds: number
+    qrUrl?: string
+    timerType?: TimerType
+  }[]
   music: {
     scenarioPlaylistId: number | null
     gamePlaylistId: number | null
@@ -33,7 +42,8 @@ export interface ScreenPackage {
   playlists: {
     id: number
     name: string
-    tracks: { id: number; name: string; position: number; assetId: string }[]
+    groups?: MusicGroup[]
+    tracks: { id: number; name: string; position: number; groupId?: number; assetId: string }[]
   }[]
   assets: { id: string; url: string }[]
 }
@@ -283,6 +293,7 @@ export function buildScreenPackage(
       )
     const playlist = entry.value
     const field = entry.field
+    const groups = parsePlaylistGroups(playlist.groups)
     const tracks = list(playlist.tracks, `${field}.tracks`)
       .map((value, index) => {
         const trackField = `${field}.tracks[${index}]`
@@ -299,11 +310,23 @@ export function buildScreenPackage(
           id: id(track.ID, `${trackField}.ID`),
           name: text(track.name, `${trackField}.name`),
           position: integer(track.position, 0, `${trackField}.position`),
+          ...(integer(track.groupId, 0, `${trackField}.groupId`)
+            ? { groupId: integer(track.groupId, 0, `${trackField}.groupId`) }
+            : {}),
           assetId,
         }
       })
       .sort((a, b) => a.position - b.position || a.id - b.id)
-    return { id: playlistId, name: text(playlist.name, `${field}.name`), tracks }
+    for (const track of tracks) {
+      if (track.groupId && !groups.some((group) => group.id === track.groupId))
+        throw new Error('Группа трека отсутствует в плейлисте')
+    }
+    return {
+      id: playlistId,
+      name: text(playlist.name, `${field}.name`),
+      tracks,
+      ...(groups.length ? { groups } : {}),
+    }
   })
   const data = {
     formatVersion: 1 as const,
@@ -480,12 +503,28 @@ export function parseScreenPackage(value: unknown): ScreenPackage {
     return {
       ID: id(playlist.id),
       name: text(playlist.name),
+      ...(playlist.groups === undefined
+        ? {}
+        : {
+            groups: list(playlist.groups).map((value) => {
+              const group = object(value)
+              if (!['repeat', 'stop', 'next'].includes(String(group.endMode)))
+                throw new Error('Некорректный режим группы пакета')
+              return {
+                ID: id(group.id),
+                name: text(group.name),
+                position: integer(group.position),
+                endMode: apiGroupEndMode(group.endMode as MusicGroup['endMode']),
+              }
+            }),
+          }),
       tracks: list(playlist.tracks).map((value) => {
         const track = object(value)
         return {
           ID: id(track.id),
           name: text(track.name),
           position: integer(track.position),
+          ...(track.groupId === undefined ? {} : { groupId: integer(track.groupId) }),
           filename: ref(track.assetId),
         }
       }),
diff --git a/src/components/ControlPage.vue b/src/components/ControlPage.vue
index b6b1c89..6c2eab7 100644
--- a/src/components/ControlPage.vue
+++ b/src/components/ControlPage.vue
@@ -487,6 +487,7 @@ onUnmounted(() => {
           </n-space>
         </n-card>
         <MusicPlanPanel
+          :server="onlineState.server"
           :playlists="onlineState.playlists"
           :local-playlists="state.catalog.playlists"
           :channel="state.channels.music"
diff --git a/src/components/MusicPlanPanel.vue b/src/components/MusicPlanPanel.vue
index 6ee52e5..d0c7637 100644
--- a/src/components/MusicPlanPanel.vue
+++ b/src/components/MusicPlanPanel.vue
@@ -12,11 +12,12 @@ import {
 } from 'naive-ui'
 import { computed, onMounted, onUnmounted, ref, watch } from 'vue'
 import type { MusicPlaylist, OnlineIntent } from '../types/online'
-import type { ChannelState, Intent, Playback, Playlist } from '../types/screen'
+import type { ChannelState, Intent, Playback, Playlist, MusicGroup } from '../types/screen'
 import { playbackControl } from '../utils/playbackControl'
 import { formatTimer } from '../utils/presentation'
 
 const props = defineProps<{
+  server: string
   playlists: MusicPlaylist[]
   localPlaylists: Playlist[]
   channel: ChannelState
@@ -51,39 +52,256 @@ function isCurrent(index: number) {
 const canPlay = computed(() => !!props.channel.source && props.outputOpen && !props.isBusy)
 function edit() {
   if (props.isBusy || !props.canEdit) return
-  selectedId.value = props.channel.playlistId
+  selectedId.value = props.channel.playlistId ?? props.playlists[0]?.id ?? null
+  lastSelected.value = selected.value
   reset()
   isEditing.value = true
 }
 const selectedId = ref<number | null>(null)
 const name = ref('')
+const originalName = ref('')
+const newGroupName = ref('')
+const pendingGroupName = ref('')
+const pendingDeletedGroupId = ref(0)
+type GroupDraft = MusicGroup & { originalName: string; originalMode: MusicGroup['endMode'] }
+const groupDrafts = ref<GroupDraft[]>([])
+const lastSelected = ref<MusicPlaylist>()
+const isNameDirty = computed(() => name.value !== originalName.value)
+function isGroupDirty(group: GroupDraft) {
+  return group.name !== group.originalName || group.endMode !== group.originalMode
+}
+const hasDraft = computed(
+  () =>
+    isDirty.value ||
+    isNameDirty.value ||
+    !!newGroupName.value.trim() ||
+    groupDrafts.value.some(isGroupDirty),
+)
+const groupModes = [
+  { label: 'Повторять группу', value: 'repeat' },
+  { label: 'Остановиться', value: 'stop' },
+  { label: 'Следующая группа', value: 'next' },
+]
+function groupDraft(group: MusicGroup): GroupDraft {
+  return { ...group, originalName: group.name, originalMode: group.endMode }
+}
+function groupConflict(group: GroupDraft) {
+  const current = selected.value?.groups?.find((item) => item.id === group.id)
+  return (
+    !current ||
+    (isGroupDirty(group) &&
+      (current.name !== group.originalName || current.endMode !== group.originalMode))
+  )
+}
+const isPlaylistActive = computed(
+  () => selectedId.value === props.channel.playlistId && props.channel.desired !== 'stopped',
+)
+function groupLocked(groupId: number) {
+  return isPlaylistActive.value && (!props.channel.groupId || props.channel.groupId === groupId)
+}
+const editorSections = computed(() => [
+  ...groupDrafts.value.map((group) => ({ id: group.id, name: group.originalName, draft: group })),
+  { id: 0, name: 'Без группы', draft: undefined },
+])
+const playbackSections = computed(() => [
+  ...(activePlaylist.value?.groups ?? []).map((group) => ({
+    id: group.id,
+    name: group.name,
+    endMode: group.endMode,
+  })),
+  { id: 0, name: 'Без группы', endMode: undefined },
+])
+function sectionTracks(groupId: number) {
+  return order.value.filter(
+    (id) => (selected.value?.tracks.find((track) => track.id === id)?.groupId ?? 0) === groupId,
+  )
+}
+function playbackTracks(groupId: number) {
+  return (activePlaylist.value?.tracks ?? [])
+    .map((track, index) => ({ track, index }))
+    .filter(({ track }) => (track.groupId ?? 0) === groupId)
+}
+function completionLabel(mode: MusicGroup['endMode'] | undefined) {
+  return groupModes.find((item) => item.value === (mode ?? 'repeat'))?.label
+}
+function saveGroup(group: GroupDraft) {
+  if (!selected.value || !group.name.trim() || groupConflict(group)) return
+  emit('action', {
+    action: 'group-save',
+    playlistId: selected.value.id,
+    groupId: group.id,
+    name: group.name.trim(),
+    endMode: group.endMode,
+  })
+}
+function createGroup() {
+  if (!selected.value || !newGroupName.value.trim()) return
+  pendingGroupName.value = newGroupName.value.trim()
+  emit('action', {
+    action: 'group-save',
+    playlistId: selected.value.id,
+    groupId: 0,
+    name: newGroupName.value.trim(),
+    endMode: 'repeat',
+  })
+}
+function cancelGroup(group: GroupDraft) {
+  const current = selected.value?.groups?.find((item) => item.id === group.id)
+  groupDrafts.value = current
+    ? groupDrafts.value.map((item) => (item.id === group.id ? groupDraft(current) : item))
+    : groupDrafts.value.filter((item) => item.id !== group.id)
+}
+function moveGroup(id: number, offset: number) {
+  if (!selected.value) return
+  const ids = selected.value.groups?.map((group) => group.id) ?? []
+  const index = ids.indexOf(id),
+    target = index + offset
+  if (index < 0 || target < 0 || target >= ids.length) return
+  ids.splice(index, 1)
+  ids.splice(target, 0, id)
+  emit('action', { action: 'group-reorder', playlistId: selected.value.id, groupIds: ids })
+}
+function removeGroup(group: GroupDraft) {
+  const playlistId = selected.value?.id
+  if (!playlistId) return
+  dialog.warning({
+    title: 'Удалить группу?',
+    content: `Группа «${group.name}» будет удалена. Все её треки останутся в плейлисте без группы.`,
+    positiveText: 'Удалить',
+    negativeText: 'Отмена',
+    onPositiveClick: () => {
+      pendingDeletedGroupId.value = group.id
+      emit('action', { action: 'group-delete', playlistId, groupId: group.id })
+    },
+  })
+}
+function assignGroup(trackId: number, groupId: number) {
+  if (selected.value)
+    emit('action', { action: 'track-group', playlistId: selected.value.id, trackId, groupId })
+}
+function finish() {
+  const close = () => {
+    isEditing.value = false
+    reset()
+  }
+  if (!hasDraft.value) {
+    close()
+    return
+  }
+  dialog.warning({
+    title: 'Отменить несохранённые изменения?',
+    content: 'Черновики плейлиста и групп будут отменены.',
+    positiveText: 'Отменить изменения',
+    negativeText: 'Продолжить редактирование',
+    onPositiveClick: close,
+  })
+}
+watch(
+  () => props.server,
+  () => {
+    isEditing.value = false
+    selectedId.value = null
+    lastSelected.value = undefined
+    reset()
+  },
+)
 const order = ref<number[]>([])
 const original = ref<number[]>([])
-const selected = computed(() => props.playlists.find((p) => p.id === selectedId.value))
+const selected = computed(
+  () =>
+    props.playlists.find((p) => p.id === selectedId.value) ??
+    (isEditing.value && hasDraft.value ? lastSelected.value : undefined),
+)
 const isDirty = computed(() => JSON.stringify(order.value) !== JSON.stringify(original.value))
+const isSelectedMissing = computed(
+  () => !!selectedId.value && !props.playlists.some((item) => item.id === selectedId.value),
+)
 const hasConflict = computed(
   () =>
-    selected.value &&
-    JSON.stringify(selected.value.tracks.map((t) => t.id).sort((a, b) => a - b)) !==
-      JSON.stringify([...original.value].sort((a, b) => a - b)),
+    isSelectedMissing.value ||
+    (!!selected.value &&
+      JSON.stringify(selected.value.tracks.map((track) => track.id)) !==
+        JSON.stringify(original.value)),
 )
-const isDisabled = computed(() => !props.canEdit || props.isBusy)
+const isDisabled = computed(() => !props.canEdit || props.isBusy || isSelectedMissing.value)
 let timer: ReturnType<typeof setInterval> | undefined
 function reset() {
   original.value = selected.value?.tracks.map((t) => t.id) ?? []
   order.value = [...original.value]
   name.value = selected.value?.name ?? ''
+  originalName.value = name.value
+  newGroupName.value = ''
+  pendingGroupName.value = ''
+  pendingDeletedGroupId.value = 0
+  groupDrafts.value = (selected.value?.groups ?? []).map(groupDraft)
 }
-watch(selectedId, reset)
+function resetOrder() {
+  original.value = selected.value?.tracks.map((track) => track.id) ?? []
+  order.value = [...original.value]
+}
+watch(selectedId, () => {
+  lastSelected.value = props.playlists.find((item) => item.id === selectedId.value)
+  reset()
+})
 watch(
   () => props.playlists,
   (items, old) => {
+    if (!isEditing.value) return
     const added = items.find((p) => !old.some((o) => o.id === p.id))
-    if (!isDirty.value && added) selectedId.value = added.id
-    if (selectedId.value && !selected.value) selectedId.value = null
-    const oldName = old.find((p) => p.id === selectedId.value)?.name
-    if (name.value === oldName) name.value = selected.value?.name ?? ''
-    const ids = selected.value?.tracks.map((t) => t.id) ?? []
+    if (!hasDraft.value && added) selectedId.value = added.id
+    const current = items.find((item) => item.id === selectedId.value)
+    if (!current) {
+      if (!hasDraft.value) {
+        selectedId.value = null
+        lastSelected.value = undefined
+        reset()
+      }
+      return
+    }
+    lastSelected.value = current
+    const previous = old.find((item) => item.id === current.id)
+    const created = current.groups?.find(
+      (group) =>
+        group.name === pendingGroupName.value &&
+        !previous?.groups?.some((item) => item.id === group.id),
+    )
+    if (
+      pendingGroupName.value &&
+      created?.name === pendingGroupName.value &&
+      newGroupName.value.trim() === pendingGroupName.value
+    ) {
+      newGroupName.value = ''
+      pendingGroupName.value = ''
+    }
+    if (!isNameDirty.value || name.value.trim() === current.name) {
+      name.value = current.name
+      originalName.value = current.name
+    }
+    const drafts = groupDrafts.value
+    groupDrafts.value = [
+      ...(current.groups ?? []).map((group) => {
+        const draft = drafts.find((item) => item.id === group.id)
+        if (
+          !draft ||
+          !isGroupDirty(draft) ||
+          (draft.name.trim() === group.name && draft.endMode === group.endMode)
+        )
+          return groupDraft(group)
+        return { ...draft, position: group.position }
+      }),
+      ...drafts.filter(
+        (draft) =>
+          draft.id !== pendingDeletedGroupId.value &&
+          isGroupDirty(draft) &&
+          !current.groups?.some((group) => group.id === draft.id),
+      ),
+    ]
+    if (
+      pendingDeletedGroupId.value &&
+      !current.groups?.some((group) => group.id === pendingDeletedGroupId.value)
+    )
+      pendingDeletedGroupId.value = 0
+    const ids = current.tracks.map((track) => track.id)
     if (!isDirty.value || JSON.stringify(order.value) === JSON.stringify(ids)) {
       original.value = ids
       order.value = [...ids]
@@ -105,18 +323,24 @@ onMounted(() => {
   timer = setInterval(refresh, 10000)
 })
 onUnmounted(() => clearInterval(timer))
-function move(index: number, offset: number) {
-  const target = index + offset
-  if (target < 0 || target >= order.value.length) return
-  const [id] = order.value.splice(index, 1)
-  if (id !== undefined) order.value.splice(target, 0, id)
+function move(id: number, groupId: number, offset: number) {
+  const ids = sectionTracks(groupId),
+    target = ids[ids.indexOf(id) + offset]
+  if (target === undefined) return
+  const from = order.value.indexOf(id),
+    to = order.value.indexOf(target)
+  order.value[from] = target
+  order.value[to] = id
 }
 function remove(trackId?: number) {
   if (!selected.value) return
   const playlistId = selected.value.id
   dialog.warning({
     title: trackId === undefined ? 'Удалить плейлист?' : 'Удалить трек?',
-    content: 'Изменение сохранится на сервере. Используемые плейлисты и треки удалить нельзя.',
+    content:
+      trackId === undefined
+        ? 'Изменение сохранится на сервере. Назначенный игре или сценарию плейлист удалить нельзя.'
+        : 'Трек будет удалён из плейлиста и с сервера. Для удаления трека активной группы сначала остановите музыку.',
     positiveText: 'Удалить',
     negativeText: 'Отмена',
     onPositiveClick: () =>
@@ -133,14 +357,31 @@ function remove(trackId?: number) {
 <template>
   <n-card title="План музыки" data-testid="music-plan">
     <template #header-extra>
-      <n-button size="small" v-if="!isEditing" square aria-label="Редактировать" title="Редактировать" :disabled="isDisabled" @click="edit">
-        <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
+      <n-button
+        size="small"
+        v-if="!isEditing"
+        square
+        aria-label="Редактировать"
+        title="Редактировать"
+        :disabled="isDisabled"
+        @click="edit"
+      >
+        <svg
+          width="18"
+          height="18"
+          viewBox="0 0 24 24"
+          fill="none"
+          stroke="currentColor"
+          stroke-width="2"
+          aria-hidden="true"
+        >
           <path d="m16 3 5 5M3 21l5-1L21 7a2.8 2.8 0 0 0-4-4L4 16z" />
         </svg>
       </n-button>
       <n-space v-else>
         <template v-if="isDirty || hasConflict">
-          <n-button size="small"
+          <n-button
+            size="small"
             :disabled="isDisabled || !selected || hasConflict"
             @click="
               selected &&
@@ -152,24 +393,29 @@ function remove(trackId?: number) {
             "
             >Сохранить порядок</n-button
           >
-          <n-button size="small" :disabled="props.isBusy" @click="reset">Отменить порядок</n-button>
+          <n-button size="small" :disabled="props.isBusy" @click="resetOrder"
+            >Отменить порядок</n-button
+          >
         </template>
-        <n-button size="small" :disabled="isBusy || isDirty || !!hasConflict" @click="isEditing = false"
-          >Готово</n-button
-        >
+        <n-button size="small" :disabled="isBusy" @click="finish">Готово</n-button>
       </n-space>
     </template>
-    <n-space v-if="isEditing" vertical data-testid="music-plan-editor">
+    <n-space v-if="isEditing" vertical :wrap-item="false" data-testid="music-plan-editor">
       <p v-if="!canEdit">Для редактирования библиотеки подключитесь к серверу.</p>
       <template v-else>
         <n-select
           v-model:value="selectedId"
           :options="playlists.map((p) => ({ label: p.name, value: p.id }))"
-          :disabled="isDisabled || isDirty"
+          :disabled="isDisabled || hasDraft"
           placeholder="Плейлист для редактирования"
           :input-props="{ 'aria-label': 'Плейлист для редактирования' }"
         />
         <p v-if="!playlists.length">Плейлистов пока нет.</p>
+        <n-alert
+          v-if="selectedId && !playlists.some((item) => item.id === selectedId)"
+          type="warning"
+          >Плейлист удалён на сервере. Черновик сохранён до отмены изменений.</n-alert
+        >
         <template v-if="selected">
           <label for="playlist-name">Название плейлиста</label>
           <n-input
@@ -178,7 +424,8 @@ function remove(trackId?: number) {
             :disabled="isDisabled"
           />
           <n-space>
-            <n-button size="small"
+            <n-button
+              size="small"
               :disabled="isDisabled || !name.trim() || name === selected.name"
               @click="emit('action', { action: 'playlist-rename', playlistId: selected.id, name })"
               >Сохранить название</n-button
@@ -186,44 +433,174 @@ function remove(trackId?: number) {
             <n-button size="small" :disabled="isDisabled || isDirty" @click="remove()"
               >Удалить плейлист</n-button
             >
-            <n-button size="small"
+            <n-button
+              size="small"
               :disabled="isDisabled || isDirty"
               @click="emit('action', { action: 'playlist-upload', playlistId: selected.id })"
               >Добавить MP3</n-button
             >
-            <n-button size="small"
+            <n-button
+              size="small"
               :disabled="isDisabled || isDirty || !canUse || !selected.tracks.length"
               @click="emit('action', { action: 'playlist-use', playlistId: selected.id })"
               >Использовать в игре</n-button
             >
           </n-space>
-          <p v-if="!order.length">Треков пока нет.</p>
-          <ul class="track-list">
-            <li v-for="(id, index) in order" :key="id" class="track-row">
-              <div class="track-content track-edit-content">
-                <span>{{
-                  selected.tracks.find((t) => t.id === id)?.name ?? `Трек №${id} удалён на сервере`
-                }}</span>
+          <n-space :wrap="false">
+            <n-input
+              v-model:value="newGroupName"
+              placeholder="Новая группа"
+              aria-label="Название новой группы"
+              :maxlength="255"
+              :disabled="isDisabled"
+            />
+            <n-button :disabled="isDisabled || isDirty || !newGroupName.trim()" @click="createGroup"
+              >Добавить группу</n-button
+            >
+          </n-space>
+          <p v-if="isPlaylistActive">
+            Остановите музыку для изменения активной группы и порядка групп. Другие игры также могут
+            блокировать изменения.
+          </p>
+          <div class="music-groups">
+            <section
+              v-for="(section, groupIndex) in editorSections"
+              :key="section.id"
+              class="music-group"
+              :aria-label="section.name"
+            >
+              <h4>{{ section.name }}</h4>
+              <template v-if="section.draft">
+                <n-input
+                  v-model:value="section.draft.name"
+                  :maxlength="255"
+                  :disabled="isDisabled"
+                  :input-props="{ 'aria-label': `Название группы ${section.name}` }"
+                />
+                <n-select
+                  v-model:value="section.draft.endMode"
+                  :options="groupModes"
+                  :disabled="isDisabled || groupLocked(section.id)"
+                  :input-props="{ 'aria-label': `Завершение группы ${section.name}` }"
+                />
+                <n-alert v-if="groupConflict(section.draft)" type="warning"
+                  >Группа изменена или удалена на сервере. Черновик сохранён до отмены
+                  изменений.</n-alert
+                >
                 <n-space>
-                  <n-button size="small"
-                    :disabled="isDisabled || index === 0"
-                    :aria-label="`Поднять трек ${index + 1}`"
-                    @click="move(index, -1)"
+                  <n-button
+                    size="small"
+                    :disabled="
+                      isDisabled ||
+                      !section.draft.name.trim() ||
+                      !isGroupDirty(section.draft) ||
+                      groupConflict(section.draft)
+                    "
+                    @click="saveGroup(section.draft)"
+                    >Сохранить группу</n-button
+                  >
+                  <n-button
+                    v-if="isGroupDirty(section.draft) || groupConflict(section.draft)"
+                    size="small"
+                    :disabled="isBusy"
+                    @click="cancelGroup(section.draft)"
+                    >Отменить изменения группы</n-button
+                  >
+                  <n-button
+                    size="small"
+                    :disabled="
+                      isDisabled ||
+                      isPlaylistActive ||
+                      isDirty ||
+                      groupIndex === 0 ||
+                      groupConflict(section.draft)
+                    "
+                    :aria-label="`Поднять группу ${section.name}`"
+                    @click="moveGroup(section.id, -1)"
                     >↑</n-button
                   >
-                  <n-button size="small"
-                    :disabled="isDisabled || index === order.length - 1"
-                    :aria-label="`Опустить трек ${index + 1}`"
-                    @click="move(index, 1)"
+                  <n-button
+                    size="small"
+                    :disabled="
+                      isDisabled ||
+                      isPlaylistActive ||
+                      isDirty ||
+                      groupIndex >= (selected.groups?.length ?? 0) - 1 ||
+                      groupConflict(section.draft)
+                    "
+                    :aria-label="`Опустить группу ${section.name}`"
+                    @click="moveGroup(section.id, 1)"
                     >↓</n-button
                   >
-                  <n-button size="small" :disabled="isDisabled || isDirty" @click="remove(id)"
-                    >Удалить трек</n-button
+                  <n-button
+                    size="small"
+                    type="error"
+                    :disabled="
+                      isDisabled || groupLocked(section.id) || groupConflict(section.draft)
+                    "
+                    @click="removeGroup(section.draft)"
+                    >Удалить группу</n-button
                   >
                 </n-space>
-              </div>
-            </li>
-          </ul>
+              </template>
+              <p v-if="!sectionTracks(section.id).length">Треков пока нет.</p>
+              <ul class="track-list">
+                <li v-for="(id, index) in sectionTracks(section.id)" :key="id" class="track-row">
+                  <div class="track-content track-edit-content">
+                    <span>{{
+                      selected.tracks.find((track) => track.id === id)?.name ??
+                      `Трек №${id} удалён на сервере`
+                    }}</span>
+                    <n-select
+                      :value="section.id"
+                      :options="
+                        (selected.groups ?? [])
+                          .map((group) => ({
+                            label: group.name,
+                            value: group.id,
+                            disabled: groupLocked(group.id),
+                          }))
+                          .concat([{ label: 'Без группы', value: 0, disabled: false }])
+                      "
+                      :disabled="isDisabled || isDirty || groupLocked(section.id)"
+                      :input-props="{
+                        'aria-label': `Группа трека ${selected.tracks.find((track) => track.id === id)?.name}`,
+                      }"
+                      @update:value="assignGroup(id, $event)"
+                    />
+                    <n-space>
+                      <n-button
+                        size="small"
+                        :disabled="
+                          isDisabled || (section.id !== 0 && groupLocked(section.id)) || index === 0
+                        "
+                        :aria-label="`Поднять трек ${index + 1} в группе ${section.name}`"
+                        @click="move(id, section.id, -1)"
+                        >↑</n-button
+                      >
+                      <n-button
+                        size="small"
+                        :disabled="
+                          isDisabled ||
+                          (section.id !== 0 && groupLocked(section.id)) ||
+                          index === sectionTracks(section.id).length - 1
+                        "
+                        :aria-label="`Опустить трек ${index + 1} в группе ${section.name}`"
+                        @click="move(id, section.id, 1)"
+                        >↓</n-button
+                      >
+                      <n-button
+                        size="small"
+                        :disabled="isDisabled || isDirty || groupLocked(section.id)"
+                        @click="remove(id)"
+                        >Удалить трек</n-button
+                      >
+                    </n-space>
+                  </div>
+                </li>
+              </ul>
+            </section>
+          </div>
           <n-alert v-if="hasConflict" type="warning"
             >Состав треков изменился на сервере. Отмените черновик, чтобы принять актуальный
             список.</n-alert
@@ -243,8 +620,10 @@ function remove(trackId?: number) {
             emit('command', { action: 'playlist', channel: 'music', playlistId: $event })
           "
         />
-        <n-button size="small"
+        <n-button
+          size="small"
           square
+          v-if="!channel.groupId"
           :type="channel.loop ? 'primary' : 'default'"
           :disabled="isBusy"
           :aria-pressed="channel.loop"
@@ -252,53 +631,51 @@ function remove(trackId?: number) {
           title="Повторять плейлист"
           @click="emit('command', { action: 'loop', channel: 'music', enabled: !channel.loop })"
         >
-          <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true">
+          <svg
+            width="18"
+            height="18"
+            viewBox="0 0 24 24"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2"
+            aria-hidden="true"
+          >
             <path d="m17 2 4 4-4 4M3 11V8a2 2 0 0 1 2-2h16M7 22l-4-4 4-4m14-1v3a2 2 0 0 1-2 2H3" />
           </svg>
         </n-button>
       </div>
-      <p v-if="channel.source" class="current-track" data-testid="current-music-track">{{ channel.source.name }}</p>
+      <p v-if="channel.source" class="current-track" data-testid="current-music-track">
+        {{ channel.source.name }}
+      </p>
       <div class="track-actions">
         <n-space align="center">
-          <n-button size="small"
+          <n-button
+            size="small"
             square
             :disabled="!canPlay"
             :aria-label="control.label"
             :title="control.label"
             @click="emit('command', { action: control.action, channel: 'music' })"
           >
-            <svg
-              width="18"
-              height="18"
-              viewBox="0 0 24 24"
-              fill="currentColor"
-              aria-hidden="true"
-            >
-              <path
-                v-if="control.action === 'pause'"
-                d="M6 4h4v16H6zM14 4h4v16h-4z"
-              />
+            <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true">
+              <path v-if="control.action === 'pause'" d="M6 4h4v16H6zM14 4h4v16h-4z" />
               <path v-else d="M7 4v16l13-8z" />
             </svg>
           </n-button>
-          <n-button size="small"
+          <n-button
+            size="small"
             square
             :disabled="!canPlay"
             aria-label="Стоп"
             title="Стоп"
             @click="emit('command', { action: 'stop', channel: 'music' })"
           >
-            <svg
-              width="18"
-              height="18"
-              viewBox="0 0 24 24"
-              fill="currentColor"
-              aria-hidden="true"
-            >
+            <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true">
               <path d="M5 5h14v14H5z" />
             </svg>
           </n-button>
-          <n-button size="small"
+          <n-button
+            size="small"
             square
             :disabled="!canPlay"
             aria-label="Сначала"
@@ -363,41 +740,90 @@ function remove(trackId?: number) {
           {{ channel.duration === null ? '—' : formatTimer(channel.duration * 1000) }}
         </span>
       </div>
-      <n-alert v-if="channel.error" type="error">{{
-        channel.error
-      }}</n-alert>
+      <n-alert v-if="channel.error" type="error">{{ channel.error }}</n-alert>
 
       <p v-if="!localPlaylists.length">Плейлистов в игре пока нет.</p>
       <p v-else-if="!activePlaylist">Выберите плейлист.</p>
       <p v-else-if="!activePlaylist.tracks.length">Треков пока нет.</p>
-      <ul v-if="activePlaylist" class="track-list">
-        <li
-          v-for="(track, index) in activePlaylist.tracks"
-          :key="track.id"
-          class="track-row"
-          :class="{ 'track-current': isCurrent(index) }"
-          :data-track-index="index"
-          :aria-current="isCurrent(index) ? 'true' : undefined"
+      <n-button
+        v-if="channel.groupId"
+        size="small"
+        :disabled="isBusy || !outputOpen"
+        @click="emit('command', { action: 'group', channel: 'music', groupId: 0 })"
+        >Играть весь плейлист</n-button
+      >
+      <div v-if="activePlaylist" class="music-groups">
+        <section
+          v-for="section in playbackSections"
+          :key="section.id"
+          class="music-group"
+          :aria-label="section.name"
         >
-          <div class="track-content">
-            <div class="track-title">
-              <span>{{ track.name || `Трек ${index + 1}` }}</span>
-              <n-button
-                data-testid="select-track"
-                size="small"
-                :disabled="isBusy || isCurrent(index)"
-                @click="emit('command', { action: 'track', channel: 'music', trackIndex: index })"
-                >{{ isCurrent(index) ? 'Выбран' : 'Выбрать' }}</n-button
-              >
-            </div>
-          </div>
-        </li>
-      </ul>
+          <n-space align="center" justify="space-between">
+            <h4>
+              {{ section.name
+              }}{{ section.id && channel.groupId === section.id ? ' · Выбрана' : '' }}
+            </h4>
+            <n-button
+              v-if="section.id"
+              size="small"
+              :disabled="isBusy || !outputOpen || !playbackTracks(section.id).length"
+              @click="emit('command', { action: 'group', channel: 'music', groupId: section.id })"
+              >Играть группу</n-button
+            >
+          </n-space>
+          <p v-if="section.id">{{ completionLabel(section.endMode) }}</p>
+          <p v-if="!playbackTracks(section.id).length">Треков пока нет.</p>
+          <ul class="track-list">
+            <li
+              v-for="{ track, index } in playbackTracks(section.id)"
+              :key="track.id"
+              class="track-row"
+              :class="{ 'track-current': isCurrent(index) }"
+              :data-track-index="index"
+              :aria-current="isCurrent(index) ? 'true' : undefined"
+            >
+              <div class="track-content">
+                <div class="track-title">
+                  <span>{{ track.name || `Трек ${index + 1}` }}</span>
+                  <n-button
+                    data-testid="select-track"
+                    size="small"
+                    :disabled="isBusy || (isCurrent(index) && channel.groupId === section.id)"
+                    @click="
+                      emit('command', { action: 'track', channel: 'music', trackIndex: index })
+                    "
+                    >{{
+                      isCurrent(index) && channel.groupId === section.id ? 'Выбран' : 'Выбрать'
+                    }}</n-button
+                  >
+                </div>
+              </div>
+            </li>
+          </ul>
+        </section>
+      </div>
     </div>
   </n-card>
 </template>
 
 <style scoped>
+.music-groups {
+  display: grid;
+  gap: 12px;
+}
+
+.music-group {
+  border-top: 1px solid var(--n-border-color);
+  display: grid;
+  gap: 8px;
+  padding-top: 12px;
+}
+
+.music-group h4 {
+  margin: 0;
+}
+
 .music-plan-view {
   display: flex;
   flex-direction: column;
@@ -432,7 +858,6 @@ function remove(trackId?: number) {
   border-color: var(--brand-text);
 }
 
-
 .track-content {
   display: flex;
   flex: 1 1 380px;
diff --git a/src/types/online.ts b/src/types/online.ts
index 6a861c8..85a727f 100644
--- a/src/types/online.ts
+++ b/src/types/online.ts
@@ -1,4 +1,4 @@
-import type { ScreenStep } from './screen.js'
+import type { ScreenStep, MusicGroup } from './screen.js'
 
 export const DEFAULT_SERVER = 'https://evening-detective.crabs-games.art'
 export type GameStatus = 'draft' | 'run' | 'pause' | 'finish'
@@ -7,7 +7,8 @@ export type GameCommand = 'start' | 'pause' | 'play' | 'finish' | 'reset'
 export interface MusicPlaylist {
   id: number
   name: string
-  tracks: { id: number; name: string }[]
+  groups?: MusicGroup[]
+  tracks: { id: number; name: string; groupId?: number }[]
 }
 
 export interface GameMaterial {
@@ -27,6 +28,10 @@ export type OnlineIntent =
   | { action: 'playlist-delete' | 'playlist-upload' | 'playlist-use'; playlistId: number }
   | { action: 'playlist-track-delete'; playlistId: number; trackId: number }
   | { action: 'playlist-reorder'; playlistId: number; trackIds: number[] }
+  | { action: 'group-save'; playlistId: number; groupId: number; name: string; endMode: MusicGroup['endMode'] }
+  | { action: 'group-delete'; playlistId: number; groupId: number }
+  | { action: 'group-reorder'; playlistId: number; groupIds: number[] }
+  | { action: 'track-group'; playlistId: number; trackId: number; groupId: number }
   | { action: 'plan-save'; key: string; steps: ScreenStep[] }
   | { action: 'plan-refresh' }
   | { action: 'login'; server: string; email: string; password: string }
diff --git a/src/types/screen.ts b/src/types/screen.ts
index 4a562ad..49935d9 100644
--- a/src/types/screen.ts
+++ b/src/types/screen.ts
@@ -10,6 +10,7 @@ export type Intent =
   | { action: 'select'; channel: 'main'; sourceId: string }
   | { action: 'playlist'; channel: 'music'; playlistId: number }
   | { action: 'track'; channel: 'music'; trackIndex: number }
+  | { action: 'group'; channel: 'music'; groupId: number }
   | { action: 'next'; channel: 'music' }
   | { action: 'loop'; channel: 'music'; enabled: boolean }
   | { action: 'mode'; mode: ScreenMode }
@@ -26,10 +27,17 @@ export interface MediaSource {
   url: string
   ready?: boolean
 }
+export interface MusicGroup {
+  id: number
+  name: string
+  position: number
+  endMode: 'repeat' | 'stop' | 'next'
+}
 export interface Playlist {
   id: number
   name: string
-  tracks: { id: number; name: string; source: MediaSource }[]
+  groups?: MusicGroup[]
+  tracks: { id: number; name: string; groupId?: number; source: MediaSource }[]
 }
 export type TimerType = 0 | 1 | 2
 export type ScreenMode = 1 | 2 | 4 | 6 | 7 | 8 | 9 | 10
@@ -103,6 +111,7 @@ export interface ChannelState {
   error: string
   playlistId: number | null
   trackIndex: number
+  groupId: number
   loop: boolean
 }
 export interface TeamsSnapshot {
diff --git a/src/utils/media-player.ts b/src/utils/media-player.ts
index 8535dd1..f5a40d0 100644
--- a/src/utils/media-player.ts
+++ b/src/utils/media-player.ts
@@ -1,3 +1,4 @@
+import { nextMusicTrack } from './musicGroups.js'
 import type { Channel, ChannelState, Report, State } from '../types/screen.js'
 
 export function waitUntil(
@@ -165,8 +166,9 @@ export class MediaPlayer {
     const active = this.channels.music.media
     if (!state || !active) return
     const c = state.channels.music
-    const tracks = state.catalog.playlists.find((p) => p.id === c.playlistId)?.tracks ?? []
-    const next = tracks[c.trackIndex + 1] ?? (c.loop ? tracks[0] : undefined)
+    const playlist = state.catalog.playlists.find((p) => p.id === c.playlistId)
+    const transition = playlist ? nextMusicTrack(playlist, c.trackIndex, c.groupId, c.loop) : null
+    const next = transition ? playlist?.tracks[transition.index] : undefined
     const spare = this.elements.music.find((media) => media !== active)!
     spare.pause()
     spare.muted = true
diff --git a/src/utils/musicGroups.ts b/src/utils/musicGroups.ts
new file mode 100644
index 0000000..32ba54e
--- /dev/null
+++ b/src/utils/musicGroups.ts
@@ -0,0 +1,33 @@
+import type { MusicGroup } from '../types/screen.js'
+
+// The catalogue supplies groups in playback order and tracks in their global order.
+export function nextMusicTrack(
+  playlist: { groups?: MusicGroup[]; tracks: { groupId?: number }[] },
+  index: number,
+  groupId: number,
+  loop: boolean,
+): { index: number; groupId: number } | null {
+  const tracks = playlist.tracks
+  if (!tracks.length) return null
+  if (!groupId) {
+    if (index + 1 < tracks.length) return { index: index + 1, groupId: 0 }
+    return loop ? { index: 0, groupId: 0 } : null
+  }
+  const groups = playlist.groups ?? []
+  const position = groups.findIndex((group) => group.id === groupId)
+  const group = groups[position]
+  if (!group) return null
+  const following = tracks.findIndex((track, i) => i > index && track.groupId === groupId)
+  if (following >= 0) return { index: following, groupId }
+  if (group.endMode === 'repeat') {
+    const first = tracks.findIndex((track) => track.groupId === groupId)
+    return first < 0 ? null : { index: first, groupId }
+  }
+  if (group.endMode === 'next') {
+    for (const next of groups.slice(position + 1)) {
+      const first = tracks.findIndex((track) => track.groupId === next.id)
+      if (first >= 0) return { index: first, groupId: next.id }
+    }
+  }
+  return null
+}