Blind voices are often caused by the exaggerated practice of closing off the throat too tightly from the head cavities; that is, drawing the pillars of the fauces too far toward the wall of the throat. The large resonating chamber thus formed yields tones that are powerful close at hand, but they do not carry, because they are poor in overtones. The mistake consists in the practice of stretching the pillars too widely in the higher vocal ranges, also. In proportion as the pillars are extended, the breath spreads over the entire palate, instead of being concentrated on only one point of it, and bringing at the same time the resonance of the head cavities into play. The soft palate must first be drawn up to, then behind, the nose, and the attack of the higher tones be transferred thither. The pillars of the fauces must necessarily be relaxed by this action of the soft palate. Thereby breath is introduced into the cavities of the head to form the overtones, which contribute brilliancy and freshness to the voice.
Many singers persist in the bad habit here described, as long as nature can endure it; in the course of time, however, even with the most powerful physiques, they will begin to sing noticeably flat; with less powerful, the fatal tremolo will make its appearance, which results in the ruin of so many singers.
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