Comment: The important thing to take away from this lesson is that there are no so-called front and back vowels in singing. All vowels are formed in the back. The use of the "oo" vowel here is interesting.
Quote: Vowels are of particular interest throughout training. Tonal impurities are easily detectable there, as well as misconcepts in the area of pronunciation and quality. However, as vowel distortion lies within the functional process as a whole and not within the vowel proper, purification of the vowel without regard for the condition of the registration or the resonance adjustment will be ineffective. A VOWEL WILL ONLY BE AS PURE AS THE COORDINATIVE PROCESS WILL ALLOW. Consequently, work on the vowel must move toward two major functional objectives: 1) it must improve the resonance adjustment, i.e., eliminate constrictor tensions, and 2) it must assist in making changes in the registration, whether it be for purposes of separation or unification. (Voice: Psyche and Soma)