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c# - How to detect if another audio is playing in background? (Windows Phone 7)

One of my apps have recently failed certification because: "my app stops background music without asking user when it wants to play some music".

Now the question is: how can we detect if there is any music playing in the background?

Regards

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  using Microsoft.Xna.Framework.Media;

...

    if (Microsoft.Xna.Framework.Media.MediaPlayer.State == MediaState.Playing)
    {
          ....
    }

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