m4a is the iTunes stuff, right? You can just change the file extension to .mp4 and then you should be able to easily find a program that'll convert mp4's to mp3's. I think i used CDex but I'm not sure...
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FIGHT FOR YOUR RIGHT TO SKANK!
Emo kids don't cry because they're sad all the time, they cry because they have to listen to that horrible music all the time. I'd cry if i had to listen to that whiny music over and over and over....wouldn't you?
(I'm in a band, go to purevolume.com and check out East Coast Skank. Our recording sucks, but bear with it...)