Tune Toys : Expresso

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Expresso takes a simple musical expression (literally "X") and mutates it. In each generation, transformations are applied to components of the expression. This is a fractal technique known as an L-system. The more generations there are, the larger and more complex the expression gets (and the longer it can take to compute). The output varies wildly, from boring to fascinating. Press "Mutate" a few times till you get something that looks interesting, then click on the image to play it. See Composer's Quarry for examples of output.

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After 20 generations the expression "X" became this:

(((((((echo(transpose(shuffle(transpose(transpose(echo((X+transpose(transpose(X,4) ,7) ) ,4,6) ,-5) ,-5) ) ,4) ,4,6) +transpose(arpeggio(transpose(transpose(step(((transpose(X,4) +transpose((X|X) ,12) ) +shuffle(((X+transpose(X,12) ) |transpose((X+X) ,-5) ) ) ) ,12) ,4) ,4) ) ,12) ) |(transpose(((echo(transpose(transpose(shuffle(echo(step(X,12) ,4,6) ) ,-5) ,-7) ,4,6) +transpose(transpose((echo(transpose(echo((X|transpose(X,-5) ) ,4,6) ,-7) ,4,6) +transpose(transpose(((transpose((X|X) ,-7) +transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ,7) ) ,-5) ,7) ) ,4) ,4) ) +transpose((((shuffle(echo(X,4,6) ) |transpose(X,4) ) |((arpeggio(X) +transpose(transpose(echo((transpose(X,-5) |transpose(X,-7) ) ,4,6) ,4) ,4) ) +transpose(step(X,12) ,7) ) ) |arpeggio((X+transpose(shuffle(transpose(X,-7) ) ,7) ) ) ) ,7) ) ,4) |transpose((arpeggio(echo(echo(((X+X) +(X+X) ) ,4,6) ,4,6) ) |transpose(((((X|X) +transpose(step(transpose(X,4) ,12) ,12) ) +transpose((transpose((X+transpose(echo(X,4,6) ,12) ) ,-7) +transpose((X+transpose(X,7) ) ,12) ) ,4) ) +transpose(transpose(transpose((X|X) ,4) ,-5) ,7) ) ,4) ) ,-7) ) ) |transpose(((arpeggio((shuffle((step(shuffle((X+transpose(X,7) ) ) ,12) +echo(transpose(transpose(X,-5) ,4) ,4,6) ) ) +transpose(transpose(X,-5) ,7) ) ) +transpose(((transpose(arpeggio(step(transpose((X+transpose(X,7) ) ,-5) ,12) ) ,-5) +transpose(transpose((transpose(((X|X) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,-7) +transpose(transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ,-5) ,7) ) ,-5) ,12) ) +transpose(step(((transpose(step(X,12) ,-5) +X) +transpose(shuffle(((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) +transpose(arpeggio(transpose(X,4) ) ,12) ) ) ,12) ) ,12) ,7) ) ,4) ) +transpose((shuffle(((transpose((X+transpose(X,7) ) ,-7) +transpose(((X+X) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) +transpose(transpose(transpose((transpose((echo(transpose(X,-5) ,4,6) +transpose(shuffle(X) ,7) ) ,-5) +transpose((transpose(transpose(X,4) ,-5) +arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) ,4) ,-5) ,12) ) ,7) ) ,-7) ) +transpose(transpose(((transpose((step(((transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,-5) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,-7) ) ,12) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) ,-5) +transpose((((((X+(X+X) ) |((X+transpose(X,7) ) +X) ) +transpose(X,-5) ) |transpose(((X+X) +arpeggio(X) ) ,4) ) +transpose((step((transpose(transpose(transpose(X,4) ,4) ,-5) +transpose((transpose(X,4) +transpose(echo((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,12) ) ,12) ) ,12) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ,12) ) ,4) ) +transpose(transpose(transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +(X+X) ) +transpose((transpose((((X+transpose(X,7) ) |transpose(X,-5) ) +transpose(step(X,12) ,12) ) ,4) +transpose(arpeggio((X+transpose(step(X,12) ,7) ) ) ,-5) ) ,7) ) ,4) ,-5) ,7) ) ,4) ,4) ) +transpose(transpose(step(step((((transpose((transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) ,4) +(((transpose(X,-5) |arpeggio(X) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose((((X+transpose(X,7) ) +transpose((X|X) ,7) ) +(transpose((X+transpose(X,12) ) ,4) +transpose(X,7) ) ) ,7) ) ) ,-7) +transpose((step(((arpeggio(X) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,12) +transpose((transpose(transpose((X|X) ,-7) ,4) +(transpose(transpose(X,4) ,4) +arpeggio(X) ) ) ,12) ) ,4) ) +transpose(transpose((transpose(echo(transpose(transpose(transpose((X|X) ,-7) ,-5) ,4) ,4,6) ,-5) +transpose(transpose((echo((X|X) ,4,6) |step(transpose(step(X,12) ,4) ,12) ) ,-5) ,12) ) ,-7) ,7) ) +transpose((transpose(transpose((X+(X+X) ) ,-7) ,4) +transpose((transpose(((X+X) +transpose(X,-5) ) ,-5) +((((X+X) +transpose(X,-5) ) +echo(transpose(X,4) ,4,6) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ) ,12) ) ,7) ) ,12) ,12) ,-7) ,7) ) +transpose(step(((step(((((step(transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-5) ,-5) ,12) |transpose(step(transpose(X,-5) ,12) ,-7) ) +((transpose((transpose(X,4) |(X|X) ) ,-7) +(echo((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(arpeggio(X) ,7) ) ,4,6) +transpose((transpose(shuffle(transpose(X,4) ) ,4) |(X|X) ) ,7) ) ) +shuffle((transpose(arpeggio(transpose((X+X) ,4) ) ,-7) +shuffle((X+transpose(X,12) ) ) ) ) ) ) +(echo(((transpose((arpeggio(shuffle(X) ) +transpose(echo(X,4,6) ,-7) ) ,4) +transpose(shuffle(echo(X,4,6) ) ,4) ) +transpose(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,4) ,7) ) ,4,6) |((transpose(transpose(transpose(X,4) ,-5) ,-7) +transpose(((((arpeggio(step(X,12) ) +transpose((X|X) ,4) ) +transpose((X+transpose(X,4) ) ,7) ) +transpose(((X+transpose(X,7) ) |(X+X) ) ,4) ) +transpose((X+X) ,7) ) ,12) ) +shuffle(transpose((arpeggio(X) |shuffle(X) ) ,4) ) ) ) ) |transpose(transpose(echo(arpeggio(((arpeggio(step(transpose(X,4) ,12) ) +transpose(((transpose(X,-7) +transpose(X,7) ) |echo(X,4,6) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ,7) ) ) ,4,6) ,-7) ,4) ) ,12) +(transpose(arpeggio((transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) |transpose(((((((transpose(X,-7) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(X,7) ) |arpeggio(echo((transpose(shuffle(X) ,-5) +transpose(((X|X) +transpose((X|X) ,7) ) ,7) ) ,4,6) ) ) +shuffle((transpose(X,-7) |X) ) ) ,-7) ) ) ,-5) +((((transpose(transpose(X,4) ,4) +transpose((transpose(((X+X) |(X+transpose(X,12) ) ) ,4) |(transpose(transpose(X,-7) ,4) +transpose(transpose(X,-7) ,7) ) ) ,12) ) +transpose(transpose(arpeggio((echo(X,4,6) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ) ,-7) ,12) ) |transpose((((X+transpose(X,12) ) +transpose((X+X) ,-7) ) +transpose(echo(X,4,6) ,4) ) ,4) ) +((transpose(((shuffle(echo(X,4,6) ) +transpose(transpose((transpose((X+X) ,-7) +transpose(X,-5) ) ,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) +transpose(((transpose(echo(X,4,6) ,-7) +transpose(transpose((X|X) ,-5) ,7) ) |((transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) +transpose(step(transpose(X,-7) ,12) ,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) +echo((((X+transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,4,6) ) ) ) ) +transpose(((transpose((transpose((((X+transpose(X,12) ) +transpose(transpose(transpose((X|X) ,-5) ,-7) ,12) ) |(((transpose((X+transpose((X|X) ,7) ) ,-7) |((transpose(X,-5) +transpose((step(X,12) +transpose(transpose(X,-5) ,12) ) ,12) ) +transpose(step((X|X) ,12) ,12) ) ) +((X|X) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ) +transpose((shuffle(transpose(arpeggio(X) ,-5) ) |transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) ) ,12) ) ) ,-5) |(echo(((transpose((((X+X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,4) ) +transpose(step(transpose(transpose(transpose(X,-5) ,-5) ,-7) ,12) ,7) ) ,4,6) +transpose((transpose((((((transpose((X|X) ,-5) +transpose(shuffle(transpose(X,-5) ) ,7) ) +transpose(transpose(X,4) ,7) ) +transpose((((X+X) +transpose(X,4) ) +transpose((transpose(X,-7) |(X+X) ) ,7) ) ,12) ) |(shuffle(X) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ) +transpose((((step(X,12) +X) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +X) ) +((X+transpose(echo(X,4,6) ,12) ) +step((step(X,12) +transpose(X,7) ) ,12) ) ) ,-7) ) ,-5) +transpose(((transpose(transpose(shuffle((X+transpose((X+transpose(X,7) ) ,7) ) ) ,4) ,-7) +transpose((transpose(X,-7) +transpose((transpose(X,-5) +(transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ,7) ) ,12) ) +transpose(echo((((X|transpose(X,-5) ) +X) +transpose(((transpose(X,-7) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,7) ) ,4,6) ,7) ) ,-5) ) ,12) ) ) ,4) |(((transpose(transpose(transpose((((X+transpose(X,7) ) |X) +transpose(arpeggio(step(X,12) ) ,7) ) ,4) ,4) ,-7) +transpose(echo((((transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose((((transpose(X,-7) +transpose((X|X) ,4) ) +transpose(shuffle(X) ,7) ) |echo(step(transpose(X,-5) ,12) ,4,6) ) ,7) ) +(((X+transpose(X,7) ) |X) |arpeggio(X) ) ) ,4,6) ,12) ) +arpeggio(shuffle((transpose((((X+transpose(X,7) ) +transpose(transpose((X+X) ,4) ,4) ) +transpose((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,-5) +transpose((((arpeggio(transpose(X,-5) ) +transpose(arpeggio(shuffle(transpose(X,-7) ) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) +(shuffle(((X|X) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(((transpose(echo(X,4,6) ,4) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose((X+X) ,7) ) ,12) ) ) ,-5) ) ) ) ) +transpose(transpose(shuffle(shuffle(transpose((transpose(transpose(step(X,12) ,-5) ,-5) |(shuffle(X) +transpose(X,12) ) ) ,-7) ) ) ,-7) ,7) ) ) |transpose((transpose(((transpose(transpose(echo((X|X) ,4,6) ,-5) ,4) +transpose((echo(step(transpose(transpose(X,-7) ,-5) ,12) ,4,6) +(transpose(step(X,12) ,4) |step(X,12) ) ) ,4) ) +transpose(((((transpose((X|X) ,4) +transpose((((transpose(X,-5) +X) +transpose(transpose((X|X) ,4) ,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +((transpose(X,4) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) +transpose((transpose(X,-5) +transpose(arpeggio(X) ,-7) ) ,12) ) ) +transpose(echo(step(shuffle(transpose(X,4) ) ,12) ,4,6) ,7) ) ,7) ) ,4) |transpose((((shuffle(echo((X+X) ,4,6) ) +transpose((((transpose(transpose(X,-7) ,-5) +transpose(echo(X,4,6) ,7) ) +transpose(X,12) ) |shuffle(transpose(X,4) ) ) ,12) ) +transpose((X+transpose(shuffle(echo(X,4,6) ) ,12) ) ,4) ) +transpose(((step((X|X) ,12) +(echo((X+transpose(X,12) ) ,4,6) +(X+transpose(X,7) ) ) ) +transpose(shuffle((echo(X,4,6) +transpose((transpose((X+X) ,-7) +transpose(shuffle((X+X) ) ,12) ) ,12) ) ) ,7) ) ,7) ) ,-5) ) ,4) ) ,12) ) ,12) ,7) ) +transpose((((transpose((echo(((transpose((((((transpose((X+X) ,-5) +transpose((step(X,12) +(echo(X,4,6) |X) ) ,4) ) +transpose(transpose(transpose((X+X) ,-5) ,-5) ,7) ) +transpose((transpose(transpose(X,4) ,4) |step(transpose(X,-5) ,12) ) ,7) ) +transpose((transpose((X+transpose(X,12) ) ,4) +transpose(arpeggio((X+X) ) ,7) ) ,4) ) +transpose(arpeggio(step(step(transpose(X,-5) ,12) ,12) ) ,7) ) ,-7) |transpose((((X+X) +((X+transpose(step(X,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +(((((X+X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(X,-7) ,12) ) |(arpeggio(X) +step(X,12) ) ) ) ,-5) ) +transpose(arpeggio(echo(echo(X,4,6) ,4,6) ) ,4) ) ,4,6) +transpose(transpose((((transpose(step(((step((transpose(X,4) +step(X,12) ) ,12) +transpose((transpose(transpose(X,4) ,-5) +transpose((transpose(X,-7) +transpose((X|X) ,12) ) ,12) ) ,4) ) +transpose(((transpose(X,-7) +transpose(arpeggio((X+(X+transpose(X,12) ) ) ) ,4) ) +transpose((X|transpose(X,-7) ) ,7) ) ,7) ) ,12) ,-7) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose(((transpose(transpose(X,-7) ,-7) +transpose(transpose(arpeggio(arpeggio(X) ) ,4) ,7) ) +arpeggio(transpose((arpeggio(transpose(X,-5) ) |((X+transpose(X,12) ) |(X+transpose(X,7) ) ) ) ,4) ) ) ,7) ) +transpose(transpose(shuffle(((step(X,12) +((X+transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ) ,4) ,12) ) ,-5) ,12) ) ,-5) +transpose(((transpose((((transpose((transpose((((transpose((step(transpose(X,4) ,12) +step(shuffle(transpose(arpeggio(X) ,-5) ) ,12) ) ,-7) |(shuffle((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ) +(echo(transpose(X,-5) ,4,6) +((X+transpose(X,7) ) +transpose(X,7) ) ) ) ) +transpose(((echo((((arpeggio(X) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(X,7) ) |((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) ) ,4,6) +transpose((transpose(X,4) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ,-5) ) +transpose(transpose(shuffle(transpose(X,-7) ) ,4) ,12) ) ,4) ) +transpose(((transpose((X+transpose(X,7) ) ,4) +transpose(step((((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) +transpose(step(X,12) ,-5) ) ,12) ,12) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |transpose(step((X+transpose(X,7) ) ,12) ,-7) ) ,4) ) ,7) ) ,4) |transpose(((transpose(((X+transpose(X,12) ) |(((((X+transpose(X,12) ) +transpose(X,7) ) |arpeggio(X) ) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(((step(X,12) |(X+transpose(X,12) ) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,7) ) ) ,4) +transpose(transpose(((step(X,12) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ,-5) ,4) ) +transpose((transpose(((shuffle((X+X) ) +transpose(shuffle(transpose(X,-7) ) ,12) ) +transpose((((X+X) +transpose((X+transpose(X,7) ) ,7) ) |transpose(X,-5) ) ,7) ) ,4) +transpose(((((transpose(transpose(X,-7) ,4) +echo(X,4,6) ) +transpose(((X|X) +transpose(X,-5) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |arpeggio(X) ) ,7) ) +transpose(((X|transpose(X,-7) ) +transpose(((X+transpose(X,7) ) |(X+X) ) ,12) ) ,7) ) ,7) ) ,7) ) ,-7) ) ,-5) +transpose(echo((echo(X,4,6) +transpose((X+transpose(X,-5) ) ,12) ) ,4,6) ,4) ) +transpose(step(arpeggio(transpose((arpeggio(transpose(step(X,12) ,-7) ) +transpose((arpeggio(X) |(X|X) ) ,12) ) ,-5) ) ,12) ,7) ) |(transpose(transpose(shuffle(transpose(transpose(transpose((arpeggio(X) +transpose((X|X) ,7) ) ,4) ,-5) ,4) ) ,4) ,-7) |transpose(transpose(transpose((transpose(transpose(transpose(X,-7) ,-7) ,-7) +arpeggio(X) ) ,-7) ,-7) ,-7) ) ) ,4) +transpose(((transpose((transpose(shuffle(echo(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) |(transpose(X,4) +transpose(X,7) ) ) +((echo((shuffle((X|X) ) +transpose((transpose(X,-5) +transpose(X,7) ) ,12) ) ,4,6) +transpose((transpose(X,-7) +transpose(step((step(X,12) |(X+X) ) ,12) ,12) ) ,12) ) +echo(((transpose(X,-7) +transpose(X,7) ) |transpose(X,-7) ) ,4,6) ) ) +((transpose(X,4) |(transpose(X,-7) |(X|X) ) ) +transpose((((X|echo(X,4,6) ) +transpose((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +((X+transpose(X,7) ) +transpose(shuffle(X) ,7) ) ) ,7) ) +transpose(((echo(X,4,6) |transpose(X,-7) ) |echo(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,7) ) ,12) ) ) ,4,6) ) ,-7) +transpose(arpeggio((((((transpose(arpeggio(echo(shuffle(X) ,4,6) ) ,4) |((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(X,4) ) +transpose(step(X,12) ,7) ) |(echo(X,4,6) +transpose(X,-5) ) ) +(((transpose(X,-5) |(X+transpose(X,12) ) ) |transpose(((X|X) |(X+transpose(X,12) ) ) ,-7) ) |((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ) +transpose(((((X|X) +transpose(transpose(shuffle(X) ,-7) ,7) ) +transpose((transpose(transpose(arpeggio(X) ,4) ,-5) +transpose((transpose(X,-5) +transpose(((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,12) ) |((echo(echo(X,4,6) ,4,6) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(arpeggio((transpose(X,4) +transpose((X+X) ,12) ) ) ,7) ) ) ,4) ) +transpose(transpose((((transpose(X,-5) +transpose(X,12) ) +transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,7) ) +transpose(((step(X,12) +transpose(shuffle(X) ,12) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,4) ) ,4) ,7) ) +transpose(arpeggio(((((X|X) +transpose(transpose(transpose(X,4) ,4) ,7) ) |(transpose((transpose(X,-5) +transpose(transpose((X+X) ,-7) ,7) ) ,-5) +(arpeggio(X) +transpose((X+transpose(X,12) ) ,12) ) ) ) +transpose(step(transpose((shuffle((X+(X+transpose(X,12) ) ) ) +transpose(X,-5) ) ,-7) ,12) ,7) ) ) ,4) ) +transpose(echo((transpose((X+transpose(transpose(echo(X,4,6) ,4) ,7) ) ,4) +((X+transpose(X,12) ) +echo(X,4,6) ) ) ,4,6) ,7) ) ) ,7) ) ,-5) +transpose((step((transpose((step((echo(((((transpose(X,-5) +transpose((X|X) ,7) ) +transpose(X,-7) ) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,4,6) |echo(echo(((X|X) |transpose(X,4) ) ,4,6) ,4,6) ) ,12) |step(shuffle(transpose(arpeggio(transpose(X,-5) ) ,4) ) ,12) ) ,4) +transpose(((((transpose((((X+transpose(transpose(X,4) ,4) ) +transpose((((X|X) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) |((X|X) +(X|X) ) ) ,-7) +transpose(transpose((transpose(X,-7) |(X+X) ) ,4) ,4) ) +transpose((step((shuffle((X|X) ) +transpose((((X+transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) |(X+transpose(X,12) ) ) ,12) ) ,12) +transpose(arpeggio((transpose(transpose(arpeggio(X) ,-5) ,-5) +transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ) ,12) ) ,7) ) +transpose(((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) |step(transpose((X+X) ,4) ,12) ) ,4) ) |(transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) +(transpose(transpose(step(transpose(transpose(X,4) ,4) ,12) ,-7) ,-5) +step(arpeggio(echo((X|(X+transpose(X,7) ) ) ,4,6) ) ,12) ) ) ) ,-5) ) ,12) +transpose(shuffle(((((((transpose((X|X) ,-5) +transpose(echo((((X+transpose(X,7) ) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ,4,6) ,4) ) +transpose(transpose(arpeggio((X+X) ) ,-7) ,7) ) +transpose(arpeggio(((((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(X,4) ) +transpose(step((X+X) ,12) ,7) ) ) ,4) ) +transpose(((echo((X+transpose(X,7) ) ,4,6) |echo(step(X,12) ,4,6) ) +transpose(transpose(transpose(transpose(X,4) ,4) ,-5) ,12) ) ,7) ) +transpose(transpose(transpose(((X+transpose((X+X) ,12) ) +transpose(transpose((((X|transpose(X,-7) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,-5) ,12) ) ,-7) ,4) ,7) ) +transpose(shuffle(((transpose((X+transpose(X,4) ) ,4) +transpose(echo((X|X) ,4,6) ,7) ) +transpose((((arpeggio(X) +(transpose(X,4) +transpose(echo(X,4,6) ,7) ) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,-5) ) ) ,7) ) ) ,4) ) ,12) ) +arpeggio(arpeggio(step(transpose(((shuffle(transpose((arpeggio(step(X,12) ) |(transpose(X,4) +transpose(X,12) ) ) ,-7) ) +(transpose(transpose(transpose(X,-5) ,-5) ,-7) +transpose(((arpeggio((X+transpose(X,12) ) ) +transpose(X,4) ) +transpose(transpose((X+(X+transpose(X,7) ) ) ,4) ,7) ) ,7) ) ) +transpose(((transpose(transpose((X|transpose(X,-7) ) ,4) ,-7) +arpeggio(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) ) ) |((transpose((echo(X,4,6) |transpose(X,-5) ) ,-7) +transpose(echo(((((X|echo(X,4,6) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose((step(X,12) +transpose(X,12) ) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ,4,6) ,12) ) +((((X|X) +transpose((X+transpose(X,7) ) ,12) ) +(X+transpose(X,7) ) ) +transpose((arpeggio(((arpeggio(arpeggio(X) ) +transpose((transpose(X,-7) |X) ,4) ) +transpose((X|transpose(X,-7) ) ,7) ) ) +arpeggio(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,12) ) ) ) ,12) ) ,4) ,12) ) ) ) ,4) ) +transpose(shuffle(step((transpose(transpose(transpose(arpeggio(echo(transpose((shuffle(transpose((X+transpose(X,7) ) ,-7) ) |(X+(X|(X|X) ) ) ) ,4) ,4,6) ) ,4) ,-7) ,-5) +transpose(echo(transpose(transpose((transpose((transpose(X,4) +transpose(X,12) ) ,4) +transpose((shuffle(step(transpose(transpose((X+transpose(X,7) ) ,4) ,4) ,12) ) +transpose(transpose(transpose(transpose((X|X) ,4) ,4) ,4) ,12) ) ,12) ) ,-5) ,-5) ,4,6) ,12) ) ,12) ) ,7) ) ,4) ) +transpose(echo(transpose(arpeggio(transpose(((((transpose(X,-7) |echo(transpose(X,-5) ,4,6) ) +transpose(((transpose((X+transpose(X,7) ) ,-7) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) ,12) ) +arpeggio(((transpose(X,4) +transpose((X|X) ,12) ) +((X+transpose(X,12) ) |X) ) ) ) +transpose((transpose((((((shuffle((X+transpose(X,7) ) ) |transpose(X,-7) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(transpose((transpose(X,-5) |X) ,-7) ,7) ) +transpose(((transpose(X,-5) +transpose(X,12) ) +X) ,4) ) +transpose((((X|X) |transpose(X,-7) ) +transpose((X|(X|X) ) ,12) ) ,7) ) ,-5) |step(transpose((((X|X) +transpose((X|X) ,12) ) +transpose(((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,4) ,12) ) ,7) ) ,-5) ) ,4) ,4,6) ,7) ) +((transpose((((transpose(((X+transpose(X,12) ) +transpose((X|X) ,-5) ) ,-7) +transpose(transpose((transpose(((transpose(X,4) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,7) ) +((transpose(X,4) +transpose(X,-5) ) +transpose(arpeggio(X) ,12) ) ) ,-5) +((echo(X,4,6) +transpose(transpose((X+transpose((X|X) ,12) ) ,-5) ,4) ) +transpose((((X|X) +transpose((X+X) ,7) ) +transpose(X,-7) ) ,7) ) ) ,4) ,7) ) |step(((((X+transpose(X,7) ) |transpose((X+X) ,-5) ) +(step((X+transpose(X,7) ) ,12) +transpose((((X+(X+transpose(X,7) ) ) +transpose(X,-7) ) +transpose(step(X,12) ,12) ) ,7) ) ) +((X+transpose(X,12) ) |X) ) ,12) ) +((shuffle(transpose((step(X,12) +transpose(echo(X,4,6) ,7) ) ,-5) ) +transpose((transpose(step(transpose((transpose(X,4) |X) ,4) ,12) ,4) +transpose(transpose(((X+X) +(X+transpose(X,7) ) ) ,-7) ,7) ) ,4) ) +transpose(((transpose(X,-7) +transpose(transpose(transpose(((X|transpose(X,4) ) |transpose(step(X,12) ,-5) ) ,4) ,-5) ,4) ) +transpose(((X+X) +transpose(((X|X) |transpose(transpose(X,4) ,-7) ) ,12) ) ,7) ) ,7) ) ) ,-7) +transpose(((((step(((step(((transpose(transpose(X,4) ,-7) +transpose((transpose(X,4) |transpose(X,4) ) ,12) ) +echo((((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,4,6) ) ,12) +transpose((transpose(step(shuffle(transpose(X,-7) ) ,12) ,-7) |echo(transpose(((X+transpose((X|(X+transpose(X,7) ) ) ,12) ) +transpose(step(X,12) ,-5) ) ,4) ,4,6) ) ,12) ) +transpose(transpose(step(transpose(step((X+(X+transpose((X|X) ,12) ) ) ,12) ,-7) ,12) ,-5) ,12) ) ,12) +transpose((echo(((transpose(arpeggio((((((transpose(X,-5) +X) +transpose(transpose(X,4) ,4) ) +transpose(((X+X) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) +X) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +(transpose(X,4) +shuffle(X) ) ) ,-5) ) ) ,-7) +transpose((transpose(transpose(transpose(arpeggio(X) ,-5) ,-7) ,-5) +(transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) |((((((X+transpose((X|X) ,4) ) +transpose((X+X) ,7) ) +transpose((X+(X|X) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) |arpeggio(transpose(X,4) ) ) ) ) ,4) ) +transpose(transpose(((transpose(transpose((X|X) ,-7) ,4) |(transpose((transpose(X,4) +transpose(X,-7) ) ,-7) +((X+transpose((X|X) ,4) ) +transpose((X+X) ,7) ) ) ) +echo((transpose(((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) |X) ,4,6) ) ,4) ,7) ) ,4,6) +transpose(((((arpeggio(X) |(X+transpose(X,12) ) ) +shuffle(((((X+X) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X+X) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ) ) +transpose(echo(((transpose((X+X) ,-5) +((((X+transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose((X+transpose(X,12) ) ,12) ) ) +transpose(step(transpose((X+transpose(X,12) ) ,-5) ,12) ,7) ) ,4,6) ,7) ) +transpose(echo(((((X+(X+X) ) |transpose(((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) |(transpose(X,-5) |(transpose(X,4) +X) ) ) |((transpose((echo((X+transpose(X,7) ) ,4,6) |(shuffle(X) +transpose(step(X,12) ,12) ) ) ,-7) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose((transpose((X+X) ,-5) |(step((transpose(X,-5) |(X+transpose(X,12) ) ) ,12) |step(transpose(X,-5) ,12) ) ) ,7) ) ) ,4,6) ,7) ) ,7) ) ,4) ) +transpose(echo(transpose(echo((((arpeggio(transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(arpeggio(arpeggio((X+transpose(X,12) ) ) ) ,7) ) +(step(X,12) +transpose(X,-5) ) ) |arpeggio(echo(transpose(transpose((X|X) ,-5) ,4) ,4,6) ) ) ,4,6) ,-7) ,4,6) ,7) ) +transpose(transpose((arpeggio(transpose(transpose(echo(X,4,6) ,-7) ,-5) ) |echo(((transpose(arpeggio(((X+X) +transpose((X+X) ,7) ) ) ,4) +transpose(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ,7) ) +transpose((((transpose(X,-5) +(X+X) ) |shuffle(X) ) |transpose(arpeggio(((X+X) +transpose(X,4) ) ) ,4) ) ,7) ) ,4,6) ) ,4) ,4) ) +transpose(transpose(transpose(echo(transpose((transpose(((transpose(transpose((arpeggio(X) +transpose((X|X) ,12) ) ,4) ,-7) +transpose(step((X+transpose(X,4) ) ,12) ,12) ) +(((X+X) +(transpose(X,4) +X) ) +transpose(transpose(transpose((X+X) ,-5) ,4) ,4) ) ) ,4) +transpose(step(((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,12) ,4) ) ,-7) ,4,6) ,-7) ,-7) ,7) ) ,7) ) +transpose((((shuffle(((((((shuffle(X) +transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(((step((X+transpose(X,12) ) ,12) |(X+transpose(X,12) ) ) +((transpose(X,-5) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,7) ) +transpose((echo((X|X) ,4,6) +echo(((X|X) |X) ,4,6) ) ,4) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) +transpose(transpose(echo(((transpose(arpeggio(X) ,4) +transpose(X,-5) ) |(((X+X) +X) +transpose(step(X,12) ,4) ) ) ,4,6) ,-5) ,7) ) ) +transpose((transpose((transpose((transpose(transpose(arpeggio(X) ,4) ,-7) +transpose((step(step(transpose(transpose(step(X,12) ,-5) ,-5) ,12) ,12) +transpose(transpose(((echo((shuffle(X) +X) ,4,6) +transpose((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,7) ) ,7) ) ,-5) +(transpose((((X+(X|X) ) +transpose((transpose(arpeggio(X) ,4) +arpeggio(arpeggio(X) ) ) ,12) ) |transpose((transpose((X+transpose(X,7) ) ,-7) +transpose((arpeggio(X) |(X+transpose(X,12) ) ) ,12) ) ,-5) ) ,-7) +transpose(((transpose((echo(transpose(X,4) ,4,6) +(transpose((transpose(X,-7) |X) ,-7) +transpose((transpose(X,-7) +transpose(X,-5) ) ,7) ) ) ,4) +transpose(step(arpeggio((arpeggio(X) +transpose(transpose(X,-7) ,12) ) ) ,12) ,4) ) +transpose(transpose(transpose(echo(step(X,12) ,4,6) ,-7) ,-5) ,7) ) ,7) ) ) ,4) |step((echo(transpose((X+X) ,-5) ,4,6) |transpose(((transpose(arpeggio(X) ,-7) +transpose((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,7) ) +transpose((arpeggio(transpose(X,-7) ) +transpose(step(X,12) ,7) ) ,7) ) ,-5) ) ,12) ) ,7) ) +(echo(((transpose(shuffle(step(((X+transpose(X,12) ) +transpose(shuffle(X) ,12) ) ,12) ) ,-5) +transpose(transpose(step((transpose(X,-7) |transpose(step(X,12) ,-7) ) ,12) ,-5) ,7) ) +transpose(((transpose(transpose(transpose(shuffle((transpose(X,4) +(X|X) ) ) ,4) ,4) ,-7) +transpose((((step(transpose(X,-7) ,12) +(transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) |((((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,12) ) ) ,12) ) ) |((transpose(((X|X) +transpose(transpose(X,-7) ,12) ) ,-5) |(transpose(transpose(X,4) ,4) +transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ) +transpose(((transpose((X|X) ,-7) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ) ) ,7) ) +transpose(step(((transpose((arpeggio((X|X) ) +transpose(transpose(X,-5) ,12) ) ,4) +transpose(arpeggio(((echo((X|X) ,4,6) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ) ,4) ) +transpose((echo(transpose(arpeggio(X) ,4) ,4,6) |((transpose(X,-7) +X) +transpose((X|(X+transpose(X,7) ) ) ,7) ) ) ,7) ) ,12) ,7) ) ,7) ) ,4,6) |transpose(transpose(shuffle(transpose((((((X+transpose(X,12) ) +arpeggio(X) ) +transpose((transpose(X,-5) |echo(X,4,6) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) +transpose(shuffle((X|X) ) ,7) ) ,4) ) ,4) ,4) ) ) |(shuffle(shuffle(step((((transpose(transpose(transpose(X,-5) ,-7) ,-5) +transpose((X+transpose(X,7) ) ,-5) ) |(transpose(((X+transpose(X,12) ) |arpeggio(X) ) ,4) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ) |(transpose(X,-7) |(transpose((X|step(transpose(X,-5) ,12) ) ,-7) +((transpose(shuffle(X) ,-7) +transpose((transpose(X,-7) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,12) ) +(((shuffle(X) +transpose(X,12) ) |transpose(transpose(X,4) ,4) ) |arpeggio(transpose(X,4) ) ) ) ) ) ) ,12) ) ) +transpose(transpose(transpose(arpeggio((transpose(transpose((echo(X,4,6) +X) ,4) ,4) |((((X+transpose(X,12) ) +(X+transpose(X,7) ) ) |step(X,12) ) |(transpose((X+transpose(X,12) ) ,-7) +transpose(X,-5) ) ) ) ) ,4) ,-7) ,-5) ) ) ,7) ) ) ,12) )
random seed used was 153929489

The algorithm for Expresso is written in KeyKit, and here's the source code.