iBroadcast - iBroadcast is a place to consolidate all of your music online.
Spotify - Map shows when two people play same song at same time
Harmony Music Player - Music player with sleek interface & cloud compatibility
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
Audiobox - Your music collection is now truly portable!
SoundCloud - Enjoy music & follow favourite artists