Musicovery is a really fun and neat music discovery site which stands out because of its innovative interface. The site separates its music into "Mood" music and "Dance" music. To help figure out what type of music you want to hear, it presents a grid with two axes which represent two musical attributes. For "Dance" music, the axes are Dance and Tempo. For "Mood" music, the axes are (Dark -> Positive) and (Calm -> Energetic). You can click anywhere on the axes to get the perfect blend of both attributes. For a good time, try alternating between Dark and Calm to Positive and Energetic.
I really like the eclectic assortment of music this site plays for you. Most other music discovery sites seem to stick to a particular genre, but with Musicovery, you will get George Gershwin right before James Brown, simply because you wanted happy, energetic music. Brilliant! For the purists, there are also controls to filter the music by genre and decade.
Nice resource for finding some old and new music stuff. I like to function of selecting mood. This really helps in finding new songs unheard before. Good website