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Iannis Xenakis, the master of pre-composition, wrote everyali, his second (mature) work for solo piano in 1973 and dedicated it to pianist Marie-Francoise Bucquet. The material is laid out on a grid of 16th notes (except for the 32nd note episodes near the beginning). The Wikipedia article describes the compositional techniques in terms of “generative contour“, “stochastic clouds“, and “polyphonic arborescences“. This may well be, but to my eyes it looks very much like a kind of fractal called a “Bifurcat
