Vinyl Music Player - A fork of Phonograph Music Player that "makes all Pro features free, as they used to be".
Spotify - Map shows when two people play same song at same time
RockPlayer - RockPlayer is a video player that supports nearly all formats.
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
VPlayer - VPlayer - a free music player for VKontakte.
SoundCloud - Enjoy music & follow favourite artists