Query by humming (QbH) is a music retrieval system that branches off the original classification systems of title, artist, composer, and genre. It normally applies to songs or other music with a distinct single theme or melody. The system involves taking a user-hummed melody (input query) and comparing it to an existing database. The system then returns a ranked list of music closest to the input query. One example of this would be a system involving a portable media player with a built-in microphone that allows for faster searching through media files. The MPEG-7 standard includes provisions for QbH music searches. Examples of QbH systems include ACRCloud, SoundHound, Musipedia, and Tunebot. External links Online demos ACRCloud SDKs SoundHound (mobile app) QbH system from Musipedia QbH research project at NYU Query by Humming at Sloud Inc, QbH applet (Active X) MaART at Sourceforge Tunebot at Northwestern University General info and articles Query By Humming – Musical Information Retrieval in an Audio Database, paper by Asif Ghias, Jonathan Logan, David Chamberlin, Brian C. Smith; ACM Multimedia 1995 A survey presentation of QBH by Eugene Weinstein, 2006 The New Zealand Digital Library MELody inDEX, article by Rodger J. McNab, Lloyd A. Smith, David Bainbridge and Ian H. Witten; D-Lib Magazine 1997 Name that Tune: A Pilot Study in Finding a Melody from a Sung Query, article by Bryan Pardo, Jonah Shifrin, and William Birmingham, Journal of the American Society for Information Science and Technology, vol. 55 (4), pp. 283-300, 2004 Acoustic fingerprinting Music search engines Voice technology