Shazam is an app that can identify music, movies, advertising, etc.

SoundHound is an audio recognition and cognition company.

Siri is an intelligent personal assistant.

Song Kong is an intelligent music tagger app designed to make the task of managing, organizing and cleaning up your digital music collection easy.

AudioTag is a music recognition website.

MusicBrainz Picard is a free and open-source software application for identifying, tagging, and organising digital audio recordings.

Musixmatch is the worlds largest lyrics platform.

ACRCloud (Formerly Syntec TV) is an automatic content recognition platform based on acoustic fingerprinting technology.

freedb is a database of compact disc track listings, where all the content is under the GNU General Public License.