How To Throat-Sing
STEP 1: The shape of the mouth

Japanese page
Relax the muscles of your jaw and lips. Keep your mouth open with about one centimeter between your upper and lower teeth.

(Dan Bennett adds: you may need to stiffen the muscles in your lips and tongue later on when you're working on the quality and pitch of the resonance.)

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Special thanks to Dan. He translated all of these instructions.

Saga J Haruhiko thro@sings.jp