ok dude first: do you have a cd burner? cuz if you do, put the mp3 files on a cd-rw and just stick it in your xbox. it might not read it the first few times depending on your xbox, but it should work.
second if you do not have a cd burner, you have to have a modded xbox. if you dont want to spend any money, you can softmod. but as you didnt know how to move music to ur xbox, yor probably a n00b(no offense) so since softmodding is confusing, you should probably just go and buy a modchip. you can get a solderless one for around 35 bucks(executer2 lite)
and you can do some really cool things with a xbox a pc and a cable modem: xbox live (didnt see that one comin, did you now?)and
xbconnect lol
to ax: "dusty?!
what a shame for such a beautiful peace of art work"
well dude, i think that i have to disagree with ur opinion on the beauty of our favorite box, lol