The Psychology of Singing / A Rational Method of Voice Culture Based on a Scientific Analysis of All Systems, Ancient and Modern

by David C. Taylor

Describing the toneless breathing exercises to be practised with the candle flame, Browne and Behnke say, "Let it be observed that the above exercise is quite distinct from the well-known practice of singing before a lighted candle, which is, comparatively speaking, an easy matter." (Voice, Song, and Speech.) A very striking fact is stated correctly by Browne and Behnke,—there is no current of air created at the lips during tone-production. Of the truth of this statement the reader may readily convince himself by trying this same experiment with a candle flame, or even with a lighted match. Hold a lighted match just in front of the lips and sing a powerful tone. The quality of the tone is of no consequence so long as it be powerful. Just sing, shout, yell, the louder the better. You will find that the flame is less affected under these circumstances than by the quiet expiration of ordinary breathing.

Considerable practice and close attention are required in order to hold back the breath in toneless breathing exercises. Whereas in producing any kind of powerful tone the breath normally creates no current of air at the lips.

There is no reason for considering this experiment a test of correct tone-production. It is impossible to produce a powerful tone of any kind, good, bad, or indifferent, and at the same time to create an appreciable current of air at the lips.

Needless to say, the breath-control theorists have entirely failed to grasp the significance of the candle-flame experiment. Yet we have here a demonstration of the mechanical law of tone-production.

Considered as a mechanical process, tone-production occurs when the energy exerted by the expiratory muscles, in their contraction, is converted into energy of motion of the vocal cords.[8] In other words, tone-production is an example of the transformation of energy. The law of the transformation and conservation of energy must therefore apply to this operation. This law is stated as follows: "Energy may be transformed from any of its forms to any other form. When energy is thus transformed the quantity of energy in the resulting form or forms is equal to the quantity of energy in the original form."

The mechanical operation of tone-production comprises the following transformations of energy: First, the energy exerted in the contraction of the expiratory muscles is converted into energy of condensation or elasticity of the air in the lungs and trachea. Second, this energy of condensation of the air is converted into energy of motion of the vocal cords. In other words, the expiratory energy is transformed into energy of motion.

One objection, at first sight very serious, may be offered against this statement: the amount of strength exerted in the contractions of the breath muscles seems many times greater than is accounted for in the motion of the vocal cords. The movements of the vocal cords are so slight as to be observable only with the aid of a specially devised apparatus, the stroboscope. Can all the expiratory force expended in tone-production show such a small result? This apparent objection is found to be groundless in view of the application in this operation of Pascal's law. As this topic was fully treated in Chapter II of Part II, no further explanation is required here.

The erroneous idea of vocal mechanics involved in the doctrine of breath-control is now fully exposed. Tone can be produced only when the expired air exerts a pressure on the vocal cords. There is no necessity for any conscious or voluntary check on the expiration. The energy of the expiration is expended in setting the vocal cords in motion. No energy of condensation is left in the expired air the instant it has passed the vocal cords. Beyond that point there is no expiratory pressure.

In one sense it is true that the expiration is "controlled" in tone-production. But this control is strictly an automatic action. The vocal cords are adjusted, by the appropriate muscular contractions, to move in response to the air pressure exerted against them. This action involves, as a necessary consequence, the holding back by the vocal cords of the out-rushing air. So long as the vocal cords remain in the position for producing tone, they also control the expiration. In this sense breath-control is an inseparable feature of tone-production.