Shazam - Shazam is a mobile app that recognizes music and TV around you.
Spotify - Map shows when two people play same song at same time
AudioTag - AudioTag.info — is a free music-recognition service.
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
Gracenote Music Recognition - Gracenote Music Recognition is best in class music recognition platform that uses audio fingerprinting technology for identifying any music.
SoundCloud - Enjoy music & follow favourite artists