TuneFind - Tunefind contains an index of music and songs appearing in popular television shows and movies. Find a song, or see where an artists music has been featured.
Shazam - Shazam is a mobile app that recognizes music and TV around you.
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.
Midomi - midomi.com find and discover music and people.
ACRCloud - Automatic Content Recognition (ACR) cloud services for Audio Recognition ( identify music, ads ), Broadcast Monitoring, Second Screen, Copyright Protection.