Spotify - Map shows when two people play same song at same time
Headset - Personal music player for Youtube and Reddit
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
Plexamp - A small music player with a number of unique features
SoundCloud - Enjoy music & follow favourite artists
Poolsuite™ - The super-summer music player