The Two-Step Property and the Mathematics of Musical Scale Size
Abstract
A Pythagorean scale is a mathematical encoding of a musical scale as a finite list of numbers of the form 3b/2a. Previous work of the first author discussed the 2-step property as a way to measure which Pythagorean scales are the most "evenly-spaced." In this paper, we give a mathematician's account of the characterization of the Pythagorean scales that have the 2-step property; compellingly, the list includes the 5-note, 7-note, and 12-note Pythagorean scales, which are well-known as the pentatonic, diatonic, and chromatic scales of music theory. (After this preprint was initially posted, it was brought to our attention that these results are not new: they have previously appeared in the work of Carey and Clampitt, and related work has been done by several other members of the music theory community, now cited below. We leave this preprint available because it is written for mathematicians with no musical background, and as such may provide helpful exposition for some audiences, but we no longer make any claim to originality of the content.)
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