Fractional-octave cycle (minor third)
2019/12/20 Album: Ambient chord progressions
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This progression is a cycle of four minor chords, going up by a minor third (one quarter of the octave) at every step. Each chord includes the root of the next, which helps with the voice leading. This clip illustrates the cycle A♭-B-D-F. Two other minor-third cycles are possible in the standard 12-note octave: B♭-C#-E-G, and C-E♭-F#-A. PDF sheet music.