Spotify - Map shows when two people play same song at same time
Bosca Ceoil - A free, easy to use tool for creating music.
SoundCloud - Enjoy music & follow favourite artists
Renoise - Renoise is a digital audio workstation.
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
Zynewave Podium - Podium is a modern digital audio workstation (DAW) for Windows.