Compare the voice instrument with the pianoforte, violin, and organ and the similarity will plainly appear.

The artificial instruments undergo no change when making a tone of higher or lower pitch other than the attuning of the vibrator to the pitch desired.

All other parts remain the same.

So when the voice is correctly focused and delivered, the only change incident to altered pitch is that made in the vibrator so as to give the proper number of vibrations for the pitch required.

If the scale is sung down, using the same vowel sound for the whole scale, the comparison will be appreciated; the pupil will not be conscious of any change in the vocal organ or experience any difficulty in descending the scale.