"The next step is to study sustained tones. As you see the artist begins
in the middle of her voice--always the best way--and sings a whole tone
on A, with the syllable Ah, always waiting a whole measure for the pupil
to imitate the tone. Next she sings A flat and so on down to lower A,
the pupil imitating each tone. She now returns to middle A and ascends
by half steps to E natural, the pupil copying each tone after it is sung
by the artist.
"The tone should be free, round and full, but not loud, and the aim be
to preserve the same quality throughout. Do not throw or push the tone,
_but spin it_.