PlaylistMap - Connect with Spotify playlist curators from around the world
HotMusic - HotMusic is the best music service to discover songs from your favourite genres RIGHT AFTER their...
Undrtone - Social layer on top of Spotify and Rdio from Scott Vener
Spotify - Map shows when two people play same song at same time
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
Boom for iOS - A music player for your iPhone with magical 3D sound