playing music on my phone

I got the PNY 4gb mirco sd and i know how to put the music on and i also have friends who know how to put music on so thats not the problem. The problem is that my LG chocolate is not detecting any music on the phone, though it does show my pics. i even try a friends 8GB miro SD and it worked. so why cant my phone find the music on the card?

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