Er, MP3 problem

I recently decided to use the MP3 feature of my PSP by putting on a few MP3 files on my memory stick. I have 2.71 SE-C. All my MP3 files come up as Corrupted Data. Why?


edit: Nevermind. I found out that all my MP3s have no data in them... which is still odd...

you've checked it was all MP3??

you put them in: PSP/MUSIC/
right??
i've done that, it worked :s sounds wierd,