Musicovery

www.musicovery.com

This free music player lets you plot your mood on a spectrum and then creates a chart of songs to fit your mood. Its a bit like liveplasma.com except that instead of finding artists similar to another artist it actually finds artists that fit your mood, and it also plays music for you, which is a feature that liveplasma.com greatly lacks. Also You can further narrow your results by genre, year, and whether the tunes are hits or not. It's a great way to discover new music and find the perfect tunes to fit your mood.