Playlistful - Collaborative playlists for parties!
Heartbeat - Listen to music with your friends together, on Spotify
Pyro - Spotify music voting for parties
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
Party On Demand - Have a party delivered to your door in 60 mins or less.
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!