The polyphonic overtone singing of German vocalist Anna-Maria Hefele is something truly unique. Her precise melodic control of the pitch of both the fundamental and overtones is amazing to watch and listen to, and something very different to the chanting style of overtone singing.
See her introductory video below, which gets particularly fascinating around the 3 minute mark as Anna-Maria demonstrates moving the fundamental and overtone pitch in different directions and at greater speed.
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