ACRCloud - Automatic Content Recognition (ACR) cloud services for Audio Recognition ( identify music, ads ), Broadcast Monitoring, Second Screen, Copyright Protection.
AudioTag - AudioTag.info — is a free music-recognition service.
AHA Music - AHA Music is a music identifier on Chrome, it detects songs playing on your browser with Spotify...
Shazam - Shazam is a mobile app that recognizes music and TV around you.
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.