Spotify - Map shows when two people play same song at same time
Heartbeat - Listen to music with your friends together, on Spotify
SoundCloud - Enjoy music & follow favourite artists
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
Audiomack - The free SoundCloud alternative
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!