Overtone singing is a fascinating vocal technique where it seems like one person is singing two notes at the same time. This happens by filtering and amplifying the natural harmonics that are contained in the sound of the human voice through specific and precise modulations of the tongue and the vocal tract.
In the western style of overtone singing it is worked without pressure on the larynx. This allows a flexible use of overtone singing technique while keeping up the ability to perform other singing styles. Also it enables polyphonic overtone singing, where besides the precise control of the harmonic scale from one stabile fundamental note, also the fundamental pitch is changed in order to enlarge the musical possibilities of this particular vocal technique.
Overtone singing can be used artistically as a musical instrument or it can function as an educational tool for singers, choral conductors and voice teachers. The capability of being able to hear and control the harmonics in the voice refines the singer‘s audio perception regarding timbre and vowel colour and improves blending and intonation in any vocal ensemble.