Spotify - Map shows when two people play same song at same time
Shazam - Shazam is a mobile app that recognizes music and TV around you.
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
Acclaimed Music - Acclaimed music is a top music recommendation tool that showcases the most popular song based on which is currently topping the Billboard charts and provides links to the latest music news.
Deezer - Deezer is a music streaming app created in France. It is available in 180 counties and gets 16 million users a month. 6 million of the users have paid subscriptions. Read more about Deezer.
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.