Free Music

Musopen provides recordings, sheet music, and textbooks to the public for free, without copyright restrictions.

Internet Archive provides public domain and Creative Commons-licensed music.

Netlabels Free "virtual record labels from Archive.org

Jamendo.com provides Creative Commons-licensed music

IODAPromonet - The Independent Online Distribution Alliance represents independent music labels and provides some legal music in mp3 format for blogs and podcasts.

ccMixter - Another great source for Creative Commons-licensed music.

Free Music Archive Legal audio download site managed by freeform radio station WFMU