Playstation Vita problem

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Hi all. Can anyone out there help. Just got a Playstation Vita. Trying to get my music from my P.C. onto it. I am using Content Manager as instructed, but it keeps telling me there are no songs. It will recognise Photos and Video, but not hte music. I,ve tried all sorts, you know mp3 or wav, but still nothing. Would love any help or advice.
Cheers in advance.