Throat Singing /Hoomii

The best-known musical form of the Mongols is the throat
singing tradition known as hoomii. Sung differently than traditional
vocals, this unique type of singing involves the production of two
distinctively audible pitches at the same time, including a low pedal
note, or drone, derived from the fundamental frequency of the vocal
cord vibrations, and higher melodic notes that result when the
singer’s mouth acts as a filter, selecting one note at a time from
among the drone’s natural overtone series pitches.