Musicovery is a visually stunning music site which enables listeners to check out music from many different genres to fit their mood. You choose your spot on a scale between energetic and calm and dark and positive then Musicovery will graphically display songs from various genres within your parameters. Listeners even get to select music from a certain decade or they can restrict music offerings to certain time periods. Handy links beside each song direct listeners to where they can buy the song if they'd like to add it to their collection.
The website says that Musicovery is also available on Wii, PSP3, and certain Nokia mobile devices. I would highly recommend that you check out this cool site.