Select now a number of the class who upon trial have been found to have light, clear voices and who are not prone to shout. Let them sing
and then slowly descend the scale of E or F, singing each tone softly, and those below C
very lightly. This will insure the uninterrupted use of the thin register to the lowest note. Let them now sing up and down the scale several times, observing the same caution when notes below C or B are sung, and also insisting that no push be given to the upper notes. Now, first excusing monotones, let the other pupils in the room sing first down the scale and then up, imitating the quality and softness of tone of the picked class. Recollect, you are asking something of your pupils which it is perfectly easy for them to do. It may be that the strength of well-formed habits stands opposed to the change, but, on the other hand, every musical instinct latent, or partly awakened, is becoming alert and proving the truth of your teaching better and faster than can any finespun reasoning. Illustrate the difference in tone-quality between the thick and thin register as often as it is necessary, to show your pupils what you wish to avoid and how you wish them to sing. When in doubt whether or not the thin quality is being sung, require softer singing until you are sure. It is better to err upon the side of soft singing than to take any chances.
In time teachers will become quick to detect the change in register, and in time also the pupils who are trained to sing in the thin voice will yield to the force of good habit, as they once did to bad habit, and seldom offend by too loud or too harsh tone.
The inquiry may naturally have arisen ere this: Are syllables, i.e., do, re, mi, etc., to be used, or the vowel-sounds? It is immaterial from the standpoint of tone-production, whether either or both are used. Until children are thoroughly accustomed to sing softly, they will be kept upon the thin register more easily when singing with a vowel-sound, than when using the syllables. The reason is that the articulation of the initial consonants of the syllables requires considerable movement of the organs of speech, viz., the tongue, lips, etc., and these movements are accompanied by a continually-increasing outrush of air from the lungs, occasioning a corresponding increase in the volume of sound. Adult voices show the same tendency to increase the volume of tone when first applying words to a passage practiced pianissimo with a vowel-sound. It is advisable then to sing scales and drill upon them with a vowel-sound, and to recur to the same drill for a corrective, when a tendency to use the thick voice in singing note exercises appears.
Scale drill may be carried on as follows: If the scales are written upon a blackboard staff, they may from day to day be in different keys. It is a very easy matter to extend the scale neither above nor below the pitches within which it is desired to confine the voice. For example, the scale of E or F may be written complete, that of G as follows:
or A