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The Tongue as Master of your Singing: Vowel Modification
Article by Shirlee Emmons
As mentioned in the homepage essay the system described here sprang from a unique experience with the natural trumpet. Post facto I discovered the writings of Shirley Emmons and Salvatore Marchesi and Ernest G White and more recently Robert Lunte. In my own teaching practice the calisthenics have proved themselves ideal for the realisation of the arguments expressed in these writings even though initially I was working on a very ad hoc basis. The basic ideas were reinforced by my working with pupils of all ages who considered themselves ( or had been cruelly told they were) as non-singers - in common parlance 'tone deaf'. (documentation here)
The Shirlee Emmons article concludes with this summation.
Thus, the crux of the matter is this: modifications persuade the resonator (vowel) to work