Playlist Machinery - Tools that help you create & organize your Spotify playlists
Spotify - Map shows when two people play same song at same time
Heartbeat - Listen to music with your friends together, on Spotify
Apple Music - Apple Music app combines your personal iTunes library with Apple's music subscription service. Music you have purchased from the iTunes store, or synced over from other sources, is available in the "Library" tab. Read more about Apple Music.
Partyhero - Pass your friends the aux!
TIDAL - Tidal is a streaming music service supported by some of the most influential artists working in the industry.