She and William Vennard are the only contemporary music teachers to have their technical approaches withstand the scrutiny of scientific investigation.
Some pioneers in vocal pedagogy, like Margaret Green and William Vennard, were quick to adopt current scientific research in the 1950s, and pursued capturing the biological process of female falsetto on film.
A few American voice teachers began to study the science, anatomy, and physiology of singing, especially Ralph Appelman at Indiana University, Oren Brown at the Washington University School of Medicine and later the Juilliard School, and William Vennard at the University of Southern California.
He taught many successful singers including acclaimed mezzo-soprano Marilyn Horne, who studied under him at the University of Southern California.
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This shift in approach led to the rejection of many of the beliefs and practices held since the bel canto era, most particularly in the areas of vocal registration and vocal resonation.
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