What's a good site that you can listen to rap music online?

Rap/hip-hop

A great site for music is Pandora Internet Radio (http://www.pandora.com)

You can enter artists you like, and it recommends music with similar musical style. They're the same people that did the Music Genome project a while back, and they're using their research for this.

If you don't like a song it recommends, you can tell it so and it will avoid songs with those musical qualities in future.

Best of all, all the music is streaming.