In this mind-boggling video, singer Anna-Maria Hefele demonstrates polyphonic overtone singing, in which a singer sounds like they are creating two pitches at once. The singer creates two tones — the fundamental and overtone — by altering the shape of their mouth and throat to manipulate resonances in their voice (the two apparent tones are, technically speaking, a single frequency). Overtone singing is found in a number of music traditions around the world, including Tuvan throat singing.
via Boing Boing
