Heartbeat - Listen to music with your friends together, on Spotify
Momixa - Pick two songs and get the perfect mix
Liyo - Stream your favorite music live with friends 🎶
Pacemaker - Create and share mixtapes with friends
Festify - Festify is a free Spotify-powered app that lets your guests choose which music should be played...
FIEND.fm - "Hot or Not" for music discovery: 2 hrs of tracks in 2 mins