Heartbeat - Listen to music with your friends together, on Spotify
Spotify - Map shows when two people play same song at same time
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
Quorus - A new way to listen to music through collaboration
SoundCloud - Enjoy music & follow favourite artists