Sound experimentation by avant-garde theatre artists of the late-nineteenth and early-twentieth centuries is an important but largely ignored aspect of theatre history. In this book, Curtin shows how attention to this activity enhances our understanding of artistic practice (modernism) and historical circumstance (modernity) and considers how avant-gardists staged sonic modernity by exploring its conceptual and communicative possibilities as well as its experiential realities. He critically examines avant-garde theatre through a composite analysis of dramatic texts, historical productions, sound recordings, philosophical speculations, and social movements.