Shazam - Shazam is a mobile app that recognizes music and TV around you.
Midomi - midomi.com find and discover music and people.
AHA Music - AHA Music is a music identifier on Chrome, it detects songs playing on your browser with Spotify...
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.
SoundHound - SoundHound - the most immersive music search, discovery and play experience on mobile.
ACRCloud - Automatic Content Recognition (ACR) cloud services for Audio Recognition ( identify music, ads ), Broadcast Monitoring, Second Screen, Copyright Protection.