How to put music on my IPhone 4?

My computer has no sound so I can't hear what music I download onto it. I was wondering if anyone knows of an app or something I can use to put free music on my IPhone. Or how to use a ps3. (I don't have anything to copy music onto)

If its saved on you're computer just drag it into iTunes and sync your iPhone to iTunes it will go onto your phone but don't delete it from your pc you still need it for next time you sync, if it's gone from the pc iTunes will take it off your iPhone.

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