MakeMePulse - Amazing audio visual experiment.
Spotify - Map shows when two people play same song at same time
YuMe - A multi-screen video advertising company providing digital video brand advertising solutions.
SoundCloud - Enjoy music & follow favourite artists
Visual Beat - Interactive music video
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