New research on overtone singing style

Tran Quang Hai (National Centre for Scientific Research, Paris)

My research is the result of my own experiments which will enable anyone to produce two simultaneous sounds similar to Mongolian and Tuvin overtone singing.

ABOUT MY OVERTONE TRAINING METHOD
Here is my "recipe" to help anyone to get this first step of overtone singing.
1. Intensify the vocal production with the throat voice
2. Pronounce the 2 vowels I and U linked together and repeat it several times in one breath.
3. Make a nasal sound and tip of the tongue in a down position
4. In this way, it is possible to obtain both the drone and the upper harmonic line in descending and ascending order.
This technique is called "technique of one mouth cavity".
The second "recipe" will help you to produce clear overtones called "technique of two mouth cavities"
1. Emit a throat sound of the vowel E`.
2. Pronounce the letter L . Maintain the position with the tip of the tougue touching the roof of the palate The mouth is divided into 2 cavities.
3. Say "LAANG" for the first exercice, and say "LONG " for the second excercice. The harmonics will come out of the mouth by modifying the mouth cavity from A to O and from O to A several times in one breath.

NEW EXPERIMENTS ABOUT OVERTONE SINGING
Other experiments have been carried out indicate that it is possible to obtain the undertones (sing one octave , one octave and a fifth below the fundamental).
Other new experiments show that it is possible to maintain the same selective harmonic level which is used as a drone while changing the pitch of fundamentals (e.g. C, F, G, C). During the presentation of his paper , Tran Quang Hai will give a live demonstration with spectral analyses.