Note: this post is from 2007, outbound links may be broken.
90+ Essential Music and Audio Websites
From the article:
Online music has always been popular, and now social networks, peer recommendations and personalized radio stations are helping fans find bands faster than ever before. Here are more than 90 sites for musicians, fans, and everyone who enjoys music.
The list includes Internet Radio, Social Networks, Music Sharing Applications and Widgets, Remixing, Mobile Music Services and even Karaoke.
Visit Masable for the full article.