Musicovery is a music-streaming site with a mood-ring interface that works like a soundboard for adjusting your robot DJ’s musical taste. Sliders dial the mood from dark to positive and the tempo from fast to slow, while boxes allow you to check genres, including everything from funk to classical. The interface is so radically different from Pandora and Last.fm that it seems like it was beamed from an ultra-sophisticated, über-arty future utopia.