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Abstract
Interval-succession treatises convey idiomatic polyphony by explaining what vertical intervals between two voices could follow one another in improvisation and counterpoint, as connected by specified melodic motions. They were the primary means of the transmission of contrapuntal teaching in treatises for centuries. This dissertation is the first to take a comprehensive, computer-assisted approach to the study of these treatises' numerous examples. I focus on the interval-succession lists in book I of Johannes Tinctoris's Liber de arte contrapuncti (1477), and in book II of Pietro Pontio's Ragionamento di musica (1588). By comparing Tinctoris's list of 768 interval successions to the theoretical list of all the successions that follow his five explicitly-stated voice-leading principles, I refute the commonly-held misconception that Tinctoris's list is exhaustive. In my examination of the 167 interval successions that respect all of Tinctoris's explicit constraints, yet that he omits from his list, I uncover nine tacit voice-leading principles that all of Tinctoris's successions respect despite the fact that he does not explicitly state them.
This study is also the first in-depth examination of the contrapuntal teaching found in Pontio's list of 123 interval successions. I draw attention to the multitude of contextual enrichments that he brings to the theoretical genre, the most significant of which is the inclusion of dissonance directly into interval-succession theory. I expose the tacit theoretical assumptions and analytical methods that are apparent in his interval-succession examples when considered together as a coherent whole. Well-known for the numerous repertoire references that Pontio makes to his own and other composers' works, I show that his approach to interval-succession theory is more akin to teaching through the use of commonplaces than through the memorization of tables of numerous examples. My examination of Tinctoris and Pontio's interval-succession treatises culminates in a comparison of their theoretical and pedagogic approaches. An appendix provides a transcription of all the examples from book II of Pontio's treatise.
I draw on these newly-uncovered facets of Tinctoris and Pontio's intervallic thinking and some important concepts from Nicola Vicentino and Joachim Burmeister's treatises to problematize the discernment of structural tones in a contrapuntal passage. These authors highlight important points to consider, but do not offer a viable approach to counterpoint reduction. I develop Ruth DeFord's (2015) theoretical discussions of her terms "compositional tactus" and "contrapuntal rhythm" into a historically-informed method of determining the structural tones of Renaissance counterpoint. An automated implementation of this approach, which I call the dynamic-offset method, can be used to reduce a contrapuntal passage, or to more generally characterize its rhythmic profile. It is made freely available online as part of the VIS Framework (Vertical Interval Successions) for music analysis of scores in symbolic notation. This music-analysis framework is a tool open to music researchers looking to make empirical observations about a piece or corpus of music. By taking my research on Renaissance interval-succession treatises into account in the computational tools I have created, my research findings and new analysis methods are made available to other researchers both in written form in my dissertation, and as computational tools in the VIS Framework.





