A form of singing where a person uses the mouth cavity as a filter to seperate and amplify the individual overtones from the fundamental and rendering them audible as separate tones. There are many different traditional styles of overtone singing coming from different cultural groups such as the peoples of Tuva, Mongolia, South Africa, Inuit, as well as modern Western styles.

The common factor is that the singers can isolate the overtones and make separate melodies from the note(s) of the Fundamental.