VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Spotify - Map shows when two people play same song at same time
foobar2000 - An advanced freeware audio player for the Windows platform.
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
Winamp - Winamp is a media player that allows users to play multiple-file formats, arrange media in a varied file-management system, and play unique media with AAC encoding.
SoundCloud - Enjoy music & follow favourite artists