I have also noted in many bass voices a similar change of adjustment at the E and F below the bass clef
It would seem therefore, that in a majority of voices until an even scale has been developed, that these readjustments appear at about the E and F and B and C throughout the vocal compass. The exceptions to this rule are so numerous however, that it can scarcely be called a rule. Some voices will have but one noticeable readjustment, and it may be any one of the three.
In some voices the changes are all imperceptible. In others, due to wrong usage, they are abrupt breaks. In every instance the teacher must give the voice what it needs to perfect an even scale. There should be no more evidence of register changes in the vocal scale than in the piano scale.
Leaving the lower two changes for the moment, let us consider the one at the upper E and F. This one is so common among sopranos that there are few who have not one, two, or three weak tones at this point. To avoid these weak tones many are taught to carry the thicker tones of the middle register up as far as they can force them in order to get the “big tone” which seems to be the sole aim of much modern voice teaching. The victims of this manner of teaching never use the real head voice, and one thing happens to them all. As time goes on the upper voice grows more and more difficult, the high tones disappear one by one, and at the time when they should be doing their best singing they find themselves vocal wrecks. Some of them change from soprano to alto and end by that route.
Now these are not instances that appear at long intervals. They are in constant evidence and the number is surprisingly large. The cause is ignorance of how to treat the upper voice, together with an insane desire for a “big tone” and a lack of patience to await until it grows. The incredible thing is that there is a teacher living whose ear will tolerate such a thing.
Now there is a way to develop the head voice that gives the singer not only the full power of his upper voice, but makes it free, flexible and vibrant, a sympathetic quality, a perfect messa di voce, and enables him to sing indefinitely without tiring his voice. He must learn that it is possible to produce a full tone with a light mechanism. This is the natural way of producing the head voice. Further, the light mechanism must be carried far below the point where the so called change of register occurs.
Every voice should have a head register, and it may be developed in the following way. With altos and sopranos I start with this exercise
