LARYNGEAL HEIGHT AS SEEN IN MODERN AND HISTORICAL VOCAL TREATISES, AND INSTRUCTIONAL LITERATURE ON HISTORICAL PERFORMANCE PRACTICE by Stacey L. Helley A Master’s Thesis Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree of MASTER OF ARTS IN EARLY MUSIC PERFORMANCE December 2015 Copyright 2015 Stacey L. Helley