IPhone 4s not playing music?

I had like 300 purchased songs on my phone and today I backed up my phone and fixed some MMS settings (I have a factory unlocked phone) and ever since then whenever I try to play a song it will just continue to skip to the next one and so one. I tried to download all the songs on my computer from my itunes account and put them back on my phone but it still doesn't work?

Try hold the home key && the lock button for 10 seconds && see if that helps.

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