IPhone music/iPod app won't open

Help please! My iPhone 4s is on iOS 5.1.1, and the music app won't open at all, when I click it, the app attempts to open, but my screen dims black a little, then goes back to the normal home screen! I've tried rebooting and respringing my phone, but it ain't working! How to fix this? I don't want to restore.

Have to restore. Just make sure you back up first

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