My iPhone 4 won't play music anymore?

After I updated my phone to iOS 6, my phone won't play music. The volume bar won't show up on the bottom of iTunes, YouTube, or pandora. And if it does and I press play it quickly disappears. Even songs I bought from iTunes won't play with out stopping. I can still hear people when they call me and what not. Is there any way I can fix this?

Go to at&t and they will help you with your phone or go to a apple store and they'll automatically give you a new iPhone if they see something they can't fix easily

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