Musicovery
Looking for music fitting your current mood? Try Musicovery an interactive web radio categorizing music with tags depending on moods like »calm«, »positive«, »dark« or »energetic«. My current mood is very important when choosing which music I want to listen to in certain moment, therefore I personally have playlists based on certain moods in iTunes too. The Musicovery interface links related music visually and makes discovering new music really easy.