Christian Wolff's alternatively notated scores grant the performer several interpretive choices. These pieces feature symbols (known as "coordination neumes") that instruct performers when to begin and end a sound event in relation to the sounds being made around them, thereby generating a reactive improvisation between the musicians. Among these scores are five compositions that form the basis of this project: For 5 or 10 People (1962), In Between Pieces (1963), For 1, 2, or 3 People (1964), Septet (1964), and Edges (1968). Focusing on these pieces specifically, this dissertation explores the unique performance practices required by Wolff's indeterminate music and contextualizes that music within his career in classics and comparative literature, particularly with regard to the concept of translation, and within his creative communities. These creative communities include his fellow New York School composers, New York's wider downtown artistic scenes in the 1950s and 60s, and the experimental music scenes at Cologne and Darmstadt. While scholars such as David Behrman, Thomas DeLio, and Mark Nelson have addressed the interactive quality of Wolff's notation and the technical skills needed to execute his pieces, I argue that there are deeper processes at work in these compositions that go beyond typical discussions of …

This dissertation explores the use of topics for dramatic purposes in Mozart's Così fan tutte. The five analytical chapters are organized around a central question: how do pastoral and fanfare topics shape the plot of Così fan tutte? Chapter 2 highlights the role topics and tropes play in emplacing and nuancing emergent meaning in the Così fan tutte motto. Chapter 3 examines transformative topical tropes in "Ah guarda, sorella." Chapter 4 shows how the horn fifths and fanfare topics in "Per pietà, ben mio" frame Fiordiligi's choice: the Albanian or Guglielmo. Chapter 5 illustrates the relationship between fanfare topics and galant recitative schemas to articulate formal boundaries between accompanied recitatives and arias. The expectations of closure emplaced by the examples from Così fan tutte nuance a reading of "Hai già vinta la causa!" from Le nozze di Figaro. Chapter 6 discusses the role of recitative intrusions and their articulation of the Count's unrest in "Vedrò mentre io sospiro." Detailed analyses and close readings of the topics and tropes in this dissertation drawn from throughout Così fan tutte showcase Mozart's rich deployment of topics in varied musical and dramatic roles.