Spotify - Map shows when two people play same song at same time
Audiorealm.com - AudioRealm is your destination for thousands of radio stations from all over the globe.
SoundCloud - Enjoy music & follow favourite artists
Radio Replaio - Radio Replaio is a quick or efficient online audio platform that allows users to listen to audio broadcast worldwide with instant processing by connecting to thousands of radio channels.
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
Shortwave Bookmarklet - Shortwave is an extensible quick-search and shortcut bookmark.