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# MPMusicPlayerApplicationController

A media player object that you use to revise the queue that’s currently playing.

```
class MPMusicPlayerApplicationController
```

## Topics

### Changing the queue contents

[`perform(queueTransaction:completionHandler:)`](/documentation/MediaPlayer/MPMusicPlayerApplicationController/perform(queueTransaction:completionHandler:))

Changes the contents of the media items in the queue.

[`MPMusicPlayerControllerQueueDidChangeNotification`](/documentation/MediaPlayer/MPMusicPlayerControllerQueueDidChangeNotification)

Indicates the music player’s queue changed.

### Changing the queue contents

[`perform(queueTransaction:completionHandler:)`](/documentation/MediaPlayer/MPMusicPlayerApplicationController/perform(queueTransaction:completionHandler:))

Changes the contents of the media items in the queue.

  <doc://com.apple.documentation/documentation/Foundation/NSNotification/Name-swift.struct/MPMusicPlayerControllerQueueDidChange>


---

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