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Well, Apple apps pull a few tricks in order to background. The apps themselves don't background, they use daemons that are always running in the background (usually use very, very little RAM and sit completely idle unless told to do something). The iPod app for example, just sends commands to this daemon which does the actual playback. The OS can also talk to the daemon (so you can double-tap the home button for iPod controls, for example).
Ideally, Apple would open up a way to write a daemon for something like Pandora.
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