The Choirmaster's Manual/Chapter 6
Sing all major scales from C upward.
For words and loose jaw.
The jaw must be kept quite still and feel as if floating; the tongue must form consonants. Sing second time mf.
Twice each vowel, slowly at first, or the notes will not be distinct.
Major thirds are very hard to sing. Boys often get a little flat on them.
Slowly at first. See that the middle note is distinct.
In Exercises 16, 17, and 18 care must be taken not to unduly accentuate the first note of the group of three.
The staccato must be effected by a sharp inward movement of the abdomen, similar to an attack (see Chapter IV); but no breath must be taken between the notes.
Sing on all vowels, softly, paying particular attention to the staccato and slurred passages. Pause on last note.
Note. Sometimes a fuller resonance is obtained by using "na" for vocalizing; this combination is also very useful for making the tongue active.