Skeptical Thinking (Carl-Robert)

Recently, my mom's friend's friend said something about how it supposedly isn't safe to post music on your myspace or blog. I was really skeptical about this. What music producer would want to take a bunch of kids crappily recorded music?! All that really matters is that we manage to get out there. I recorded an acoustic instrumental and tried to put it on myspace but it said the file (which I recorded on garage band before exporting to iTunes) was too big. Does anybody know how to make an mp3 file smaller? Please comment.