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
AudD - Basically, Shazam API. Recognize music in microphone recordings, audio files, and UGC. Identify songs playing on radio stations and audio streams. Or make your own music recognition app. Recognize music from social networks and analyze trends.