Radio Tray - Radio Tray is an online radio streaming player that runs on a Linux system tray.
Spotify - Map shows when two people play same song at same time
Radiotray-NG - An Internet radio player for Linux.
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
Radiola - Audio & Music
SoundCloud - Enjoy music & follow favourite artists