SoundNode - SoundCloud desktop app (OS X, Windows, Linux)
Spotify - Map shows when two people play same song at same time
BeardedSpice - BeardedSpice is a menubar application for Mac OSX that allows you to control web based media...
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
Atavi - Your bookmarks are always close at hand!
SoundCloud - Enjoy music & follow favourite artists