File:Octatonic Groove 22 edo.mp3
Octatonic_Groove_22_edo.mp3 (file size: 1.75 MB, MIME type: audio/mpeg)
This is a microtonal (22 EDO) jazz piece based on a theme I wrote for standard 12-EDO tuned piano, exploring the half-step/whole-step Octatonic scale. For the retuning I used a variant of the Octatonic scale that I hadn't seen before:
Rather than using Diminished temperament, tempering out both 36/35 and 50/49, I only tempered out 50/49. This results in a scale where the whole steps alternate between a larger ~8/7 whole step and a smaller ~10/9 whole step, in the pattern sMsLsMsL. This allows a distinction between septimal and 5-limit minor and major thirds without creating any wolf intervals. All dominant 7th chords either become harmonic 7th chords (4:5:6:7) or utonal chords with the ratios (1/9:1/7:1/6:1/5). Diminished 7th chords all become some inversion of (10:12:14:17).
This version is in 22 EDO. I also rendered this piece in 26 and 48 EDO.
The microtonal tuning allowed me to write two different variants of the first part of the bridge swapping 5-limit and septimal intervals. There's a neat little Av A Bb commatic passing tone in an inner melodic line in the second part of the bridge in this and the 48EDO version. This version sounds a bit wonky to me. I'm not sure why. It might work in a different timbre.
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