Prelude and Fugue in A minor - (2011)
The nine-beat (4/4 + 5/4) ground bass as theme repeats, voices and other development added as successive statements pass. The generally closed form of the parallel triads is a part of the ground bass texture, setting it apart from the additional lines.
The top voice of the ground bass' triads becomes the fugue subject with some octave displacement, twice repeated and rising a twelfth. Among the episodes, at measure 21, the ground bass harmonies blur in octave juxtaposition. With as much chromaticism as the theme offers, the statements of the subject appear in only the tonic and dominant.
2 pages, circa 3' 45" - 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 minor