Before a tone is heard vibrations of the atmospheric air must reach the ear. These are set up by the vibration of the air within the resonance chambers, and this again is effected by the mechanism below them—i.e., by the movements of the vocal bands of the larynx which are due to the blast of air emanating from the lungs, this itself being brought into being by the movements of the chest, using the term in the widest sense, thus including the diaphragm, etc.
Breathing has for its object so far as phonation is concerned no other purpose than to so affect the vocal bands, that the resonance chambers really do resound. The question is how is this breathing best accomplished so that the instrument shall be most efficiently played upon? We cannot alter the anatomical structure of the instrument appreciably, but we can improve the functioning of the several parts of the whole apparatus. Breathing can be improved as regards power and control. More can be done with less expenditure of energy than originally if there be judicious training. How shall we train? As the outgoing stream of air alone affects the vocal bands, it is clear that we must aim to so apply and regulate this outflow that the desired result shall follow from the least possible expenditure of energy. How the air is got in is important only in relation to its expenditure. But the easier the supply is furnished the better. This law of the conservation of energy is one of the greatest importance, for all beings have but a limited supply of energy and our problem must ever be how best to husband this as a wise man should study how best to spend his limited income. One must not only consider what is called for in ordinary conversational speaking, or in singing in a small room, but also when the greatest possible efforts are demanded. In all cases when movements are concerned, indeed whenever activity of any kind psychic or physiological is involved the law of habit should be borne in mind—i.e., one should so think and do that a habit may be established, for a habit implies, when a good one, that there is economy of both mental and bodily energy.
The aim of all training is to establish good habits—ways of doing things which will leave the subject with more capital to invest so to speak, as he wastes less. It follows that the same methods should always be used in trying to attain the same end. There are few subjects of equal importance so little considered by students of music in a conscious intelligent way. A clear conviction as to the foundation for close adherence to certain methods of doing things is an invaluable mental asset for any student.
The whole subject of breathing has been so fully considered in previous chapters—indeed more or less in all parts of this work—that it is not necessary to go into much detail now. The investigations of physiologists in the internal have only emphasised the author's teaching on this subject. The present position of the subject may be stated thus: (1) In inspiration the whole chest is enlarged, this involving the descent of the diaphragm. (2) The amount of mobility is much greater in the lower half of the chest. (3) This lower half of the chest and the diaphragm act together, constituting a special mechanism of great importance. (4) The abdominal muscles discharge a coöperative function. It follows that the advice of a present day famous tenor to "breathe low" is sound. Nevertheless, it must not be forgotten that inspiration begins above and that the upper chest has its functions also. It is not merely a region of support for the lower mechanism, important as this function is. The terms "abdominal" and "diaphragmatic" respiration have led to misunderstanding. Neither the abdominal muscles nor the diaphragm ever act alone in normal respiration, though they are important coöperative factors.
Breathing exercises should be based on broad views of the subject, and no part of the respiratory mechanism should be neglected.
Small an organ as is the larynx it is through it the energy of the expiratory act is transmitted effectively or the reverse to the all-important resonance chambers. This should be so done that there is no waste; in other words, that there be perfect co-ordination between the breathing and the laryngeal mechanism. The vocal bands must be so related in function to the expiratory mechanism that the outgoing blast of air shall be as effective as possible. There must be no waste of power—i.e., of the expiratory blast through escape of air that accomplishes no purpose. The blast must be so applied to the vocal bands, or, in other words, they must be so adapted to the blast that there is no waste of energy. If the bands approximate a little too late there is waste of breath power. The bands must further so beat the air of the resonance chambers as to get the greatest possible result with the least possible expenditure of energy. As all these co-ordinations imply the action of many muscles in a related way, it is plain that intelligent and prolonged training is necessary; and if our scientific knowledge had no other result than to establish such a conviction on a sure basis it would be well worth while; but it is a light unto the feet of the student and teacher at every step, only it must be a clear light, not one seen through a mental haze. If there be failure the fault must not be set down to science but to ourselves.
It is ever to be borne in mind that when anything is done in the right way not only is there no pain, unpleasant feeling or evil after-effects, but when real skill has been attained through training, the result is accomplished with a sense of ease and all the accompanying feelings are agreeable. The singer need not know that he has a throat by any disagreeable reminder. At the same time a function may be correctly discharged but continued too long, so that weariness or positive fatigue with some evil consequences may follow. Fatigue always implies more or less poisoning of the system.
Of the resonance chambers, the mouth cavity, the pharyngeal cavity and the naso-pharynx, which may both be regarded as a part of the mouth cavity, and the nasal chambers, the latter may be considered the least variable in shape; nevertheless they can, by means of the soft palate, be to a large extent shut off from the other parts of this series of chambers.
The means by which the size and shape of the resonance chambers can be varied are chiefly the soft palate and the tongue, the latter being of the greatest importance. The changes in the shape of the mouth cavity necessary for the formation of vowels are due chiefly to the movements of the tongue, and the tongue is more largely concerned in the utterance of consonants than any other moveable part of the upper voice mechanism.
For practical ends it is important to realize that one speaks with the tongue; and if one believed that everything depended on this organ, other parts—including the outer mouth or lips merely to be kept out of the way—the result would on the whole likely be gain.