Openwhyd - Collect and Share the tracks you love.
DeviantArt - deviantART was created to entertain, inspire, and empower the artist in all of us.
Music Smasher - Find any song. Music Smasher searches Spotify, Rdio, SoundCloud, Bandcamp, and YouTube.
Spotify - Map shows when two people play same song at same time
FoxTube - Play YouTube video continuously with playlists. FoxTube features:
SoundCloud - Enjoy music & follow favourite artists