Help with uploading songs to youtube

I wan't to upload my songs to youtube but how? You can't just upload mp3 files and when i use windows movie maker it's the wrong format when i try to upload. And i have tried to convert them into flv and avi but they still fail

When i try to upload to myspace it also fails. Format that you can upload: avi, asf, dv, **WMV**, mov, qt, 3g2, 3gp, 3gp2, 3gpp, gsm, mpg, mpeg, mp4, m4v, mp4v, cmp, divx, xvid, 264, rm, rmvs, flv, mkv, ogm.

Wtf!?