MediaPlayer.GameHasControl Property
Determines whether the game has control of the background music.
Namespace: Microsoft.Xna.Framework.Media
Assembly: Microsoft.Xna.Framework (in microsoft.xna.framework.dll)
A gamer can play his or her own music as the background to your game by using the Xbox 360 dashboard. If the game is currently playing custom background music (specified by the gamer using the Xbox 360 dashboard), calls to Play, Stop, Pause, Resume, MoveNext, and MovePrevious have no effect.
If another application's background music is playing, your game will need to call in order to pause the other application's background music in order to play the game's music.