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.
Spotify - Map shows when two people play same song at same time
humit - A social networking app for music sharing and discovery.
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
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
SoundCloud - Enjoy music & follow favourite artists