Pandora will steal your time.

This is cool.

I don't know how deep their resources are, but it is still cool.

http://www.pandora.com/

Type in an artist, and they will play songs of people that have been pre-determined to have an affinity with that artist. You can vote thumbs up or down, and the music will be suited to that in your future use of the site.

I typed in The Stooges and they played the Moistboyz' "I Don't Give a Fuck Where the Eagle Flies," the antithesis of John "I am afraid of cats" Ashcroft's "Let the Mighty Eagle Soar." They get props for that.