title: how to close/stop the music which is playing in background in windows phone 8 app
body: <p>How can i stop the music/song which is currently playing in background from my app?</p>
  
  <p>When user clicks the stop button in my app it should close/stop the music.</p>
  
  <p>How to implement this functionality.</p>
  
  <p>Thanks...</p>