13edo scales: Difference between revisions

Note on terminology: I often use "cofourth", "cothird", and "cosecond" for octave complements of a fourth, third or second in place of sixth, seventh and eighth. The terms describe their melodic behavior being similar to octave complements of fourths, thirds, and seconds, and work in both archaeotonic and oneirotonic contexts.

Both archaeotonic and oneirotonic modes are partly analogous to diatonic modes, though many of them sound more like combinations of different diatonic modes.

The archaeotonic scale is overall brighter, more "majory" and more concordant than the oneirotonic scale: there are more 4:5:9 chords and chords involving the 11th and 13th harmonics, and extremely dissonant intervals such as 16/11 and 32/21 are less common.

The darker, damper, more "minory" cousin of archaeotonic. Only 2 out of 8 oneirotonic modes (Dylathian and Ilarnekian) are "major" in the sense of having a major third, and both sound pretty bittersweet.

Basic chord progressions can move by perfect fourths or major seconds: J major-M minor-P minor-Ob major-J major (in Ilarnekian) or J major-K major-O major-M major-J major (in Dylathian)

Oneirotonic provides unique tetrads taking every second degree of the scale, JLNP or KMOQ. They're quite spicy, might want to try different voicings?