AudioTag - AudioTag.info — is a free music-recognition service.
Shazam - Shazam is a mobile app that recognizes music and TV around you.
Gracenote Music Recognition - Gracenote Music Recognition is best in class music recognition platform that uses audio fingerprinting technology for identifying any music.
AHA Music - AHA Music is a music identifier on Chrome, it detects songs playing on your browser with Spotify...
Tunatic - Free software to identify songs on your computer
Music Recognition - Music Recognition is a best-in-class application that identifies music of different categories in a quick and best way.