Published in 1899, 'Duality of Voice' by Emil Sutro is a research treatise that analyzes the human voice, proposing a dual nature of vocal production that challenges traditional anatomical understandings. Sutro introduces the concept that sound is generated not only through the trachea but also the œsophagus, emphasizing the interplay between physical and spiritual elements in vocalization. This work combines personal narrative with scientific inquiry, aiming to redefine voice science and psychology while exploring broader implications for understanding human existence.
