Music in general:

Not sure about the music you're looking for?  Searching for something new? 

Just want to watch some good videos?  AllMusic.com has what you need.

Another comprehensive music information site with message boards, free music downloads, and current charts.

Create custom radio, watch videos, discover new music...even find friends with similar tastes and promote your own band...all on one site!

A complete directory of genres from the Yahoo! Entertainment directory.

Looperman.com...free loops and samples, pro audio resources, and audio tutorials and tips.

DJ and lighting equipment:

Some of the best deals in live sound, recording equipment, instruments, DJ equipment, lighting, staging, and more!

Probably the foremost supplier of sound and lighting equipment for today's DJ.