When i play a song in my ipod and when the screen of my ipod locks the song stops automatically

I had created a music application and my ipod is updated to OS4.0 .When i play song in ipod and after sometime when the screen of my ipod locks the song which is being play开发者_StackOverflowed also stops automatically which is a problem.Please anybody help me in solving this problem.

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See the answer I just posted here:

how to handle the interruption in iphone