HotMusic - HotMusic is the best music service to discover songs from your favourite genres RIGHT AFTER their...
Openwhyd - Collect and Share the tracks you love.
Spotify - Map shows when two people play same song at same time
SoundClick - SoundClick is a music-based social community.
Boom for iOS - A music player for your iPhone with magical 3D sound
Zoff - Collaborate on a live music and video playlist with your friends.