foobar2000 - An advanced freeware audio player for the Windows platform.
Spotify - Map shows when two people play same song at same time
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
SoundCloud - Enjoy music & follow favourite artists
noidd.com - Enable users to share music and videos LIVE with others people on customizable channels.
Deezer - Deezer is a music streaming app created in France. It is available in 180 counties and gets 16 million users a month. 6 million of the users have paid subscriptions. Read more about Deezer.