You’re listening to your favorite band in a Windows music app, and a friend sends you an mp3 of a sweet live version of a song by his favorite band. When you open the mp3, Windows Media Player opens and starts playing the song. Now both your favorite band and his favorite band are playing at the same time. Then your alarm goes off reminding you to pick up your sister from school and it’s a cacophonous mess. You panic, and shut the lid to your laptop.
See the full post on media playback @ http://blogs.msdn.com/b/windowsappdev/archive/2012/08/23/media-playback-what-you-need-to-know-about-playing-media-to-make-your-app-shine-in-windows-8.aspx.