Prelude and Fugue in A flat minor - (2012)
Diatonic triads yield to the inclusion of non-harmonic tones, becoming fully polytonal as at measure 16. The "tenor voice" predominant in the midst of the prelude becomes the fugue subject to follow.
The fugue opens out of the final cadence, and as a stretto at the outset with a third voice for harmonic content. Additional recurrences of the subject occur beginning on other notes of the natural minor, including the seventh as an emphasized color which also begins the prelude. The last cadence retires into a lightly polytonal quiet.
2 pages, circa 3' 10" - an MP3 demo is here:
The score is available as a free PDF download, though any major commercial performance or recording of the work is prohibited without prior arrangement with the composer. Click on the graphic below for this piano score.
Prelude and Fugue in A flat minor