Mod-7 Transformations in Post-Functional Music

TL;DR: In this article, the authors explore a number of specific graphing techniques, including the diatonic lattice (Jones 2002), the justintonation Tonnetz, and mod-12/mod-7 prolongational networks.

Abstract: Many musical compositions from the end of the nineteenth century and the beginning of the twentieth century retain some elements of functional tonality but abandon others. Most analytical methods are designed to address either tonal music or atonal music, but no single method completely illuminates this body of extended-tonal music. While both tonal and post-tonal theory have been extended in various ways to address this music, the use of tonal theory for analysis of this repertoire has not been completely formalized. The main obstacle for prolongational views of extended tonality is finding sufficient conditions for establishing that certain harmonies are structural in the absence of traditional harmonic function. In this regard, acoustical measures of stability, motivic connections, and chord equivalence all may form a part in determining the structural harmonies. Prolongational analyses of music may be represented by Schenkerian notation or transformational networks based on Lewin’s Generalized Musical Intervals and Transformations (1987). This study explores a number of specific graphing techniques, including the diatonic lattice (Jones 2002), the justintonation Tonnetz, and mod-12/mod-7 prolongational networks. After using group theory to explore the relationship of diatonic scale theory and tuning theory to transformational and prolongational analysis, excerpts from Wolf, Wagner, and Ravel are analyzed using mod-7 transformations. In giving support for prolongational analyses of chromatic and neo-tonal music, this study provides a case for tonality-based approaches to post-functional harmony.