Partyhero - Pass your friends the aux!
Heartbeat - Listen to music with your friends together, on Spotify
Join My Playlist - Listen to music live together with your friends in Spotify.
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
OutLoud Social Jukebox - Control the music with your friends in real-time
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!