This is also called overtone singing, where a fundamental pitch is sung, and simultaneously reaching one or more octaves above or below the first pitch. The notes can be attained through vibration of the false vocal cords.
Often, singers travel far into the countryside looking for the right river, or go up to the steppes of the mountainside to create the proper environment for throat-singing.
An amazing performance of an unusual use of the vibrational energy of the human voice.
Enjoy this Zen in 10!