MusicZen - mp3 file organizer
Spotify - Map shows when two people play same song at same time
Harmony Music Player - Music player with sleek interface & cloud compatibility
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
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
SoundCloud - Enjoy music & follow favourite artists