title: Get notification when iPod music is stopped
body: <p>I need to play background music in my app when no other (iPod) music is playing. I can determine it when initializing my audio session:</p>
  
  <pre><code>AudioSessionGetProperty (kAudioSessionProperty_OtherAudioIsPlaying, &amp;varSize, &amp;isPlaying);
  </code></pre>
  
  <p>But I want also to start my background music when user stops iPod player (pressing home button twice and pausing the music). How can I catch this event?</p>