"All Within Your Heart + Mind":

What is overtone singing?  It is singing two notes at once.  Overtone singing, also known as throat singing, is singing a fundamental tone and clearly ringing out an overtone above that note. The harmonic overtone series is always present in all of our voices when we sing or speak.  When any person sings a note,  harmonic overtones naturally occur at fixed intervals above that note, but we don't usually hear them distinctly.  The combination of overtones gives a particular voice its distinctive timbre or tone color.

 

Overtone singers listen for individual overtones in their voices.  Through careful listening and subtle adjustments of the lips, tongue, jaw, soft palate, throat, and the rest of the vocal apparatus, they can amplify individual harmonics while suppressing others. This enables them to sing two distinct notes at once.  Harmonic overtones are found in most of the sounds in our everyday lives but we don’t usually hear them as distinct tones.  We can hear the harmonic overtone series clearly expressed through the human voice via harmonic overtone singing.

 

Overtone singing techniques seem mysterious partly because their effects are so extraordinary.  Researchers have found that harmonic overtone singers use their mouth and throat anatomy to create interconnected but distinct resonating chambers of varying sizes and shapes that alter the loudness and distribution of harmonics. 

 

Thus, Spectral Voices sculpt internal spaces to interact with external spaces.