Overtone Singing

Definition

Pronunciation: OH-ver-tohn SING-ing

Also spelled: Throat Singing, Harmonic Singing, Khoomei, Hoomii, Tuvan Throat Singing

Overtone singing is a family of vocal techniques in which a single singer produces two or more audible pitches simultaneously. By precisely shaping the throat, tongue, and lips, the singer amplifies specific harmonic overtones above a sustained fundamental drone, creating the perception of a melody sung above a continuous bass note.

Etymology

The English term 'overtone singing' describes the acoustic phenomenon — singing the overtones (harmonics) that exist above a fundamental tone. The primary Central Asian term is khoomei (also spelled hoomii, xoomii), from the Tuvan/Mongolian word meaning 'throat' or 'pharynx.' The Tuvan tradition recognizes multiple sub-styles: khoomei (the generic term and a specific gentle style), sygyt (a high whistling overtone), kargyraa (a deep sub-harmonic growl), borbangnadyr (rolling overtones), and ezengileer (stirrup rhythm). Each style uses different vocal tract configurations to isolate different regions of the harmonic series.

About Overtone Singing

The physics of overtone singing rests on a principle discoverable by anyone with a voice and a quiet room. Every sung note contains not just the fundamental frequency (the pitch you hear as 'the note') but an entire series of harmonics at integer multiples of the fundamental: if you sing a note at 150 Hz, harmonics exist at 300 Hz, 450 Hz, 600 Hz, 750 Hz, and so on. Normally, these harmonics blend into the perceived timbre of the voice. Overtone singing is the technique of amplifying individual harmonics so strongly that they become separately audible — a second, third, or even fourth distinct pitch emerging from a single throat.

The vocal tract is a resonant tube approximately 17 centimeters long in adults. Its resonant frequencies — called formants — are determined by the shape of the throat, the position of the tongue, the opening of the jaw, and the rounding of the lips. In ordinary speech and singing, formants shape vowel sounds by amplifying certain harmonic regions and suppressing others. Overtone singers exploit this mechanism with extreme precision: by moving the tongue to create a very small resonant cavity within the mouth, they boost a single harmonic by 20-30 decibels above its neighbors, making it leap out of the timbre as a separate whistling tone.

The Tuvan tradition of khoomei is the most extensively documented overtone singing practice. Tuva, a republic in southern Siberia bordering Mongolia, has a population of approximately 330,000 and a pastoral nomadic culture deeply connected to landscape. Tuvan musicians describe overtone singing as imitating the sounds of their environment: wind through mountain passes, water over rocks, the calls of birds and animals. The sygyt style, which produces a piercing whistle-like overtone, is said to evoke the sound of wind. Kargyraa, which employs the vestibular folds (false vocal cords) to produce a rumbling sub-harmonic an octave below the fundamental, is associated with mountain resonance and the growl of a camel.

The ethnomusicologist Ted Levin spent years in Tuva documenting the practice, resulting in his 2006 book Where Rivers and Mountains Sing. Levin recorded master singers including Kongar-ol Ondar and Kaigal-ool Khovalyg and documented the practice's deep connection to animist spirituality. In the Tuvan worldview, sounds are not mere representations of nature — they are participations in the living acoustic environment. Overtone singing is understood as a way of entering into resonance with landscape, communicating with spirits, and maintaining right relationship with the animate world.

Mongolian khoomii shares roots with Tuvan practice but developed distinct regional styles. The Altai and Khalkha traditions emphasize different overtone ranges and combinations. In 2010, UNESCO inscribed Mongolian khoomei on the Representative List of the Intangible Cultural Heritage of Humanity, recognizing its cultural significance and the need for preservation as modernization threatens traditional pastoral lifestyles.

Tibetan Buddhist chanting employs a form of overtone production distinct from Central Asian khoomei. In the Gyuto and Gyume tantric monasteries, monks chant in an extremely low register using a technique that activates the vestibular folds, producing a fundamental around 75 Hz with clearly audible overtones. The musicologist Huston Smith recorded Gyuto monks in the 1960s and described their chanting as 'a chord sung by a single voice.' The monastic tradition attributes spiritual significance to specific overtones — the 5th and 10th harmonics are considered particularly auspicious, corresponding to intervals of a major third and a major third two octaves up. The ability to produce clear overtones is understood as a sign of spiritual development and proper intention.

Jonathan Goldman, who studied with both Tibetan monks and Tuvan singers, integrated overtone singing into the Western sound healing framework. In his 1992 book Healing Sounds: The Power of Harmonics, Goldman proposed that specific overtones resonate with specific chakras and that the practice of producing harmonics intentionally directs vibrational energy to targeted areas of the body. He developed the formula 'Frequency + Intention = Healing,' arguing that the physical frequency of the overtone combines with the singer's focused intention to produce therapeutic effects.

The practice of overtone singing has spread globally since the 1990s, taught by performers and teachers including David Hykes (founder of the Harmonic Choir in New York, 1975), Michael Vetter (Germany), and Anna-Maria Hefele (whose YouTube demonstrations have been viewed millions of times). The Harmonic Choir's performances at the Cathedral of St. John the Divine in New York demonstrated that overtone singing in reverberant spaces produces an immersive harmonic environment in which individual overtones seem to float independently in the air — an acoustic effect that influenced the development of sound bath practices.

South Africa's Xhosa people practice a form of overtone singing called umngqokolo, performed by women and girls. Documented by ethnomusicologist Dave Dargie in the 1980s, umngqokolo involves simultaneous fundamental and overtone production during call-and-response singing. The technique appears to have developed independently of the Central Asian traditions, demonstrating that overtone singing is not a single cultural invention but a discovery that different peoples have made independently by exploring the capabilities of the human voice.

Sardinian cantu a tenore, a four-part vocal tradition from the island's interior, includes a bass voice (su bassu) that produces overtone-rich tones using a technique similar to kargyraa. UNESCO inscribed cantu a tenore in 2008. The convergence of overtone vocal techniques across Siberia, Tibet, Africa, and the Mediterranean suggests that the human vocal tract's capacity for harmonic isolation is a universal potential that surfaces wherever singers explore their voices deeply enough.

Significance

Overtone singing demonstrates that the human voice is not a single-note instrument but a harmonic generator capable of producing multiple simultaneous frequencies. This revelation has implications for acoustics, vocal pedagogy, contemplative practice, and the philosophy of sound. The fact that a single fundamental tone contains an entire series of harmonics — and that a trained singer can make these harmonics individually audible — provides a living demonstration of the acoustic principles underlying all sound healing.

Culturally, overtone singing traditions preserve some of humanity's oldest relationships between voice, landscape, and spirit. Tuvan khoomei and Mongolian throat singing encode an animist worldview in which sound is not separate from the natural world but continuous with it. The UNESCO recognition of both Mongolian and Sardinian traditions reflects growing awareness that these vocal practices represent irreplaceable cultural knowledge.

Within sound healing, overtone singing occupies a unique position because it requires no external instrument. The practitioner's body becomes the sound source, the resonating chamber, and the first recipient of the vibration simultaneously. This self-contained quality connects overtone singing to the nada yoga tradition's emphasis on internally generated sound as the most direct path to meditative absorption.

Connections

Overtone singing is the vocal counterpart to singing bowls — both produce rich harmonic overtone series from a single fundamental tone. The practice demonstrates the acoustic reality underlying nada yoga's teaching that a single sound contains multiple layers of vibration.

The relationship between specific overtones and consciousness states connects to the science of mantra and the use of seed syllables (bija mantras) to activate specific energy centers. Jonathan Goldman's integration of overtone singing with chakra theory bridges the Tuvan and Tibetan vocal traditions with the Indian yogic framework. The Aum/Om chant, when sustained with proper technique, naturally produces audible overtones — the 'singing' quality of a deep Om is itself an overtone phenomenon. Cymatic imaging of overtone singing reveals complex standing wave patterns that shift as the singer moves between harmonics.

See Also

• Aum / Om
• Mantra Science
• Nada Yoga
• Singing Bowls
• Sound Bath
• Vibrational Healing

Further Reading