Comment: Ascending arpeggios to bring the head voice quality down making the voice more lyric. Change of vowels on a single note, the sequence bringing a more lyric quality into the other vowels.

Quote: Since under certain conditions the physical dimensions of the vocal folds adjust to the acoustic properties of the surrounding resonators, it is apparent that vowel manipulation, especially when used in conjunction with the principles known to govern registration, is both theoretically and practically significant to vocal pedagogy. (A Dictionary of Vocal Terminology)