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!
SoundCloud - Enjoy music & follow favourite artists
üWave - üWave is a self-hosted collaborative listening platform.
Deezer - Deezer is a music streaming app created in France. It is available in 180 counties and gets 16 million users a month. 6 million of the users have paid subscriptions. Read more about Deezer.
musiqpad - Musiqpad is a social-music software platform for users to host their own ‘pads’ (rooms).