This dissertation examines the role of speech inflection in the composition of melodies of American musical theatre and investigates how composers approached speech inflection in their work throughout this genre's history. Through analysis of songs and interviews with composers, this dissertation investigates the relevance of speech inflection in the various styles of composition existing on Broadway. The main focus of musical theatre compositions, especially post Rodgers and Hammerstein's musical Oklahoma, is to move the plot along through songs. Therefore, the delivery of the text must be of ultimate consideration in the writing of modern musicals. A well-written speech-melody facilitates the process of a speech-melody-interpretation, which will result in the delivery of lyrics with an understandable, natural sounding quality. This investigation happens through a chronologic evaluation of the relevance of speech inflection during each of the distinct phases on Broadway, as well as an examination of the approach to writing with a speech-melody focus of each individual composer throughout history. This study explores the importance of speech inflection in American musical theatre songwriting focusing on a speech-melody approach to composition. / by Ana Flavia Zuim. / Vita. / Thesis (Ph.D.)--Florida Atlantic University, 2012. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2012. Mode of access: World Wide Web.