The “Nocturne” is based on the randomized diatonic four-pitch chords I’ve used in several pieces. Seven of these chords were used for the left-hand part. A set of seven numbers gave the number of repetitions of each chord (6215734) and the key of each chord (7623154: BECGFAD). They were then arpeggiated, in the familiar nocturnal 12/8. The right hand part was written from the three remaining pitches in each key, plus the flatted seventh, thus giving the eight pitches of two adjacent keys (B+E, E+A, C+F, etc.). The second part of the nocturne repeats the process with different chords, repetition sequence, and key sequence; with the key sequence darkened by dialing it over a couple of stops on the circle of fifths: E♭+A♭, A+D, G+C, F+B♭, B♭+E♭, D+G, C+F.

You can hear it on Bandcamp, over here.