This book and the accompanying chromatic vowel chart present many exercises that will make the voice stronger and more musical according to the precepts of Bel Canto. Vowel-pitch relationships have been notated in 117 exercises for teachers and singers, using acoustical phonetics, register, and musical notation. The exercises will develop the musical-muscular skills of both male and female singers.
Coffin's work provides an invaluable aid for voice teachers and choral conductors alike in helping singers achieve optimum resonance. Choral Journal