SOUNDS - Discover music with friends
MusicJet - Sharing links to promote all of your music, tickets and merchandise with a unique page and get insights into your fans
Spotify - Map shows when two people play same song at same time
Record Union - Record Union bids a great online platform that is appreciated for sharing music and promoting music around the sphere.
Songlink - Share music with anyone.
DistroKid - Unlimited uploads to iTunes and more. Keep 80-100% of your royalties.