Invention No. 4 in 3 parts, 67:43:31

Back to using prime numbers. This invention maps the three parts onto a 2-minute interval. The voices proceed slowly at 33.5, 21.5, and 15.5 beats per minute. There is a 7-pitch mensural canon in play: each voice proceeds through the canon at its own pace, and each begins and ends on pitches outlining a collective D minor triad. For what it is worth, the canon begins its inverted form at the halfway mark. Some spare lengthening or shortening of note values is used to achieve those last two points. The original 7-pitch theme uses all intervals (0-6, or minor 2nd through tritone). I then added some deep digital reverb to make it trippy.

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