Hyperpiano improvisation, layered. First layer: Track 1, original key. Second layer: Track 1, tuned 225 cents down, time-independent (so track became about 24 seconds longer than original), then mixed so that the two tracks time-converge at the very end. So there is some rhythmic phasing going on as well.
Catalog of djll releases here:
released October 4, 2011
Tom Djll, hyperpiano and electronics