If I got it right you want to play an mp3 playlist on OS 3.1 using the standard media player without having it on screen.
Well if you'll play audio you could use AVPlayer (http://developer.apple.com/library/ios/#documentation/AVFoundation/Reference/AVPlayer_Class/Reference/Reference.html) or, if you want pre-buffering as well, you could use AVQueuePlayer (http://developer.apple.com/library/ios/#documentation/AVFoundation/Reference/AVQueuePlayer_Class/Reference/Reference.html) - they both work with the HTTP live streaming protocol but you should fragment your tracks by using the tools provided by apple: http://developer.apple.com/resources/http-streaming.
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