Modplug
Modplug central is your portal into the free music subculture of the internet. you can download free music, and learn how to make music on your home computer, and download songs all for free!
http://www.modplug.com/
Supersonic
Supersonic
http://www.gosupersonic.com/
Winamp
Winamp, the ultimate media player, allows you to manage and play audio and video files, rip and burn cds, enjoy free music, access and share your music and videos remotely, and sync your music to your ipod , creative, and microsoft plays for sure devices . winamp features album art support, streams audio and video content, and provides access to thousands of internet radio stations and podcasts.
http://www.winamp.com/