Minecraft wiki entry for music, associated text: music play <trackName: string> [volume: float] [fadeSeconds: float] [repeatMode: MusicRepeatMode]
Plays the music track.
music queue <trackName: string> [volume: float] [fadeSeconds: float] [repeatMode: MusicRepeatMode]
Adds the music track to the queue.
music stop [fadeSeconds: float]
Stops the music.
music volume <volume: float>
Adjusts the music volume.