Abstract
Music theorists have proposed two very different geometric models of musical objects, one based on voice leading and the other based on the Fourier transform. On the surface these models are completely different, but they converge in special cases, including many geometries that are of particular analytical interest.
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Notes
- 1.
Throughout this paper we assume that pitch classes are labeled with a continuous map from the space of notes’ fundamental frequencies to \(\mathbb {R}\), with the integer values of traditional music theory arising as a discretization of this mapping. This permits labelings like f(C\() = 0\), f(C\(\sharp ) = 1\), f(D\()=2\), but not f(C\()=0\), f(G\()=1\), f(D\()=2\).
- 2.
Such smoothly changing distributions might occur in algorithmic composition or in statistical analysis. Yust [20] touts this approach as a “cardinality-flexible,” “common-tone-based” conception of musical distance, because it can relate chords of different sizes based on shared pitch-class content. It is possible that a something similar might be achieved by non-bijective cross-cardinality voice leading.
- 3.
Note that we define these crossfade paths for real-valued pitch classes, assuming each chord only has a finite number of non-zero weighted pitch classes.
- 4.
This is a reflection of the fact that a loop enclosing the circular dimension of voice-leading space sends each note in a chord up or down by one chordal step.
- 5.
It remains an open question whether there exist forms of enharmonicism, perhaps arising from extended just intonation, that cannot be captured by scalar context.
- 6.
Amiot [1], pp. 145–9, subsequently demonstrated this analytically.
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Tymoczko, D., Yust, J. (2019). Fourier Phase and Pitch-Class Sum. In: Montiel, M., Gomez-Martin, F., Agustín-Aquino, O.A. (eds) Mathematics and Computation in Music. MCM 2019. Lecture Notes in Computer Science(), vol 11502. Springer, Cham. https://doi.org/10.1007/978-3-030-21392-3_4
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