Watch Free Online HD Moviesjoy. William Vennard's collaboration with Janwillem van den Berg resulted in his film Voice Production: the Vibrating Larynx. Winning several awards, including best medical research film from a festival in Prague in 1960, it shows the anatomy and physiology of voice production in the excised larynx. He was a pioneer in the science of singing and in voice pedagogy and was instrumental in fostering collaborative efforts between singers, physicists, psychologists and voice scientists.