North Coast Synthesis Ltd.

Fractional-octave cycle (major seconds)

This is a cycle of six minor chords, going up by a major second (one sixth of an octave) at every step. Since the major second is equivalent to two fifths, while being a smallish melodic interval too, it doesn't sound too jarring as a shift in the harmony, and keeping up the cycle prevents the music from settling into any fixed key. The cycle in the clip is D-E-F#-A♭-B♭-C. The other six notes in the octave can be used for a similar cycle, A-B-C#-E♭-F-G. PDF sheet music.