Call out to Shelby Rogers who sent me a link to www.pandora.com
They've got something called the "Music Genome Project," where you can put in the name of any band (see my Crosby, Stills, Nash, and Young example here) and based on that one artist, they will craft a radio station comprised of similar music.
It's an awesome tool and a fantastic way to get introduced to new artists.
You can also network w/your friends and see their custom radio stations (see my profile here) as well as on Facebook.
For a non-music aficionado, it's a great thing.
Also, makes you realize that the days of an iPod or mp3 on your PC are numbered (here's a post from Fred Wilson on the topic as well).
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