Abstract
This paper develops a theory of spelled pitch classes (spcs) and spelled pitch − class sets (spc sets), incorporating pitch spelling into the techniques of pitch-class set theory. The symmetries of spc space are transposition and inversion along the line of fifths. Because of the inextricable link between pitch spelling and diatonic scales, spelled heptachords—seven-note spc sets that include each letter name exactly once—occupy a privileged position in this theory. Spelled heptachords may be regarded as inflected diatonic scales, and possess a number of structural characteristics not shared by other spc sets. The 66 equivalence classes of spelled heptachords without enharmonic doublings or voice crossings are enumerated. A diatonic musical structure together with a spelled heptachord determine an spc structure in which the notes of the diatonic structure are inflected by the corresponding accidentals from the heptachord; spc structures arising in this way show promise as powerful tools in analysis of chromatic harmony.
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© 2011 Springer-Verlag Berlin Heidelberg
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Hook, J. (2011). Spelled Heptachords. In: Agon, C., Andreatta, M., Assayag, G., Amiot, E., Bresson, J., Mandereau, J. (eds) Mathematics and Computation in Music. MCM 2011. Lecture Notes in Computer Science(), vol 6726. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-21590-2_7
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DOI: https://doi.org/10.1007/978-3-642-21590-2_7
Publisher Name: Springer, Berlin, Heidelberg
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