Audio in Background in iphone

I want to make an app which can play audio in background in iphone.Is there any tutorial or example av开发者_开发百科ailable?

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There are plenty out there! Google is your friend :)

http://developer.apple.com/library/ios/#documentation/Audio/Conceptual/AudioSessionProgrammingGuide/Cookbook/Cookbook.html#//apple_ref/doc/uid/TP40007875-CH6-SW1