These exercises should be sung to several vowels, but especially to the sound "koo," which will at first immensely amuse the boys, but will afterwards be found to throw the tone forward towards the teeth in a way that no other sound does.
Pure vowel tone goes with pure and resonant voice. The broad and pure vowels of the Yorkshire dialect have, more than anything else, produced the Yorkshire voices. Hence the choirmaster must make a determined effort to cure provincialisms in so far as they prevent the issue of pure vowel sounds from the mouth. The vowels should be sung in their vocal order as recommended by Mr. Behnke, oo (as in you), o (as in owe), ah (as in Shah), a (as pay), and ee (as in see). These may be taken to slow scales, thus:—
Let the choirmaster watch carefully for impure sounds, and call upon each boy to sing two measures by himself from time to time.
In singing the boy should stand upright and free. He must not lean or bend his body. The mouth must be fairly opened, but not too wide. As the voice ascends the mouth opens wider. The lips must lie lightly on the teeth, and the tongue should lie at rest, just touching the front teeth. If, for the sake of change during a long rehearsal, the boys sit, let it be remembered that there are many ways of sitting, and that the upright posture hinders the breath less than lolling and a crooked posture. Rigidity is the enemy of all good singing. Let the whole body and vocal apparatus be relaxed, and pure tone will result. "If I hear a boy forcing up his voice," said Herr Eglinger, of Basel, to me, "I ask the rest of the class to point him out, and they do it at once." This at once cures the transgressor and sharpens the consciences of the other boys. As to the vowel on which singers should be trained, there are differences of opinion. Maurice Strakosch, the trainer of Patti, Nilsson, &c., used "ha," which causes a slight breath to precede the articulation. This, he said, gives the voice a natural start. It is something like the "koo" of Mrs. Seiler. Learners he required to lower their heads while singing, and to show the upper teeth, so as to keep the lips out of the way of the tone. Mr. Barnicott, a successful choirmaster at Taunton, uses "ka." But as in the actual singing of the English language all the vowels are encountered in turn, it would seem reasonable that they should all be included in the practice.
Mr. Walter Brooks, quoted elsewhere, lays stress upon long-sustained notes in the scale of E flat, and up to G. These expand the lower part of the lungs, and produce steady, firm tone. They should be sung both loud and soft, the boys one by one and together. An admirable plan is to keep boys on the alert listening for faults, asking those not singing, "Whose fault is that?" Jealousy and conceit, says Mr. Brooks, are avoided by giving a solo to three or four boys to sing in unison. Three or four will blend better than two, and after proper rehearsal the tone is so like one voice that people say, "What a beautiful voice that boy has!"
As to balance of parts, the following table is given by Mr. H. B. Roney of Chicago:—