Music on iPhone 4S not working?

It started a couple weeks ago when all my album art was turned into a music note, which wasn't a big deal so i ignored it. But now when i press play, it shows that music is playing but no sound comes out and the volume slider disappears (the buttons don't work either). I hadn't downloaded anything before the changes occurred. Does anybody know how i can fix it? I have an iPhone 4S with the lates version of ios

Get the 5 then

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