http://blogs.msdn.com/b/wpukcoe/archive/2012/02/10/background-audio-in-windows-phone-7-5-part-2.aspxThe story so far In the first part of this series on Background Audio the architecture of the Background Audio feature of the phone was introduced. The Marketplace Certification guidelines that are relevant to Background Audio were highlighted. Thenen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)