Inuit Throat Singing
Inuit throat-singing is a guttural style of singing or chanting. It is among the world's oldest forms of music. Many think the human voice can produce only one note at a time. But throat singers can produce two or more notes at the same time. They use special techniques using throat's  resonance characteristics. By precise movements of their lips, tongue, jaw, velum, and larynx, throat-singers produce unique harmonies using only their bodies.

Inuit throat singers sometimes stand face to face and sing together until one starts to laugh.

Throat-singing is practiced in many countries where the technique takes on different styles and meanings.
 

Video: Nukariik (Inuit) Sisters Karin and Kathy Kettler demonstrate traditional Inuit throat sing
http://www.smithsonianglobalsound.org/archives_08.aspxing.

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