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 19 generations the expression "X" became this:

((((echo((((((transpose(shuffle((step(transpose(X,-5) ,12) +transpose(transpose(X,-5) ,-5) ) ) ,-7) |(((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose((X+X) ,7) ) ,7) ) +transpose((shuffle(X) +transpose(X,7) ) ,12) ) ) +transpose(((transpose(X,4) |arpeggio(echo(((transpose(X,4) +transpose(X,12) ) +transpose((step(X,12) +X) ,12) ) ,4,6) ) ) +transpose((transpose(echo(transpose(shuffle(X) ,-7) ,4,6) ,4) +transpose((transpose(transpose(X,4) ,-5) +((arpeggio(X) +(X|step(X,12) ) ) +transpose(((X+X) +((transpose(X,4) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ) ,7) ) ,7) ) ,4) ) +transpose(shuffle(arpeggio(transpose(((X+X) +X) ,-7) ) ) ,7) ) +transpose((step(transpose(transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,-5) ,-7) ,12) +transpose(((transpose(transpose(X,-5) ,4) |((X+transpose(X,7) ) |X) ) +transpose(transpose(step(step(X,12) ,12) ,-7) ,12) ) ,-7) ) ,-5) ) +shuffle(transpose(echo((transpose(transpose(step(((X|X) |transpose(X,-5) ) ,12) ,4) ,4) |((shuffle(transpose(X,-7) ) +transpose((transpose(X,4) +transpose(transpose(X,-5) ,7) ) ,12) ) +((X+transpose((arpeggio(X) +transpose(transpose(X,4) ,7) ) ,12) ) |(echo(X,4,6) +transpose(echo(X,4,6) ,7) ) ) ) ) ,4,6) ,4) ) ) ,4,6) +arpeggio((transpose(echo(transpose(((echo(transpose(shuffle(transpose(X,-7) ) ,-5) ,4,6) +transpose(transpose(X,-7) ,4) ) |transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) ,4) ) ,4) ,4,6) ,4) |transpose((transpose(step(((transpose((X+X) ,-5) +transpose(echo(shuffle(transpose(X,-7) ) ,4,6) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +(transpose(X,-5) |transpose(X,4) ) ) ,7) ) ,12) ,-5) +((step((transpose(X,4) +X) ,12) +transpose(arpeggio((X+transpose(X,7) ) ) ,12) ) +echo(((X+X) +((transpose(X,-5) +((((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ) +X) ) ,4,6) ) ) ,4) ) ) ) +transpose(((transpose((echo(((shuffle(transpose((((((X|X) +transpose(arpeggio(X) ,12) ) +transpose(((step(arpeggio(X) ,12) +transpose((X+X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose((transpose(arpeggio(X) ,4) |((echo(X,4,6) +transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,-7) ,7) ) +transpose(transpose(shuffle(((X+transpose(X,12) ) +transpose(X,12) ) ) ,4) ,-5) ) ,-7) ) |(transpose(((transpose((X|X) ,4) +transpose((shuffle(X) |X) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) ,-7) |((step((X+X) ,12) |step(transpose(X,4) ,12) ) |echo((transpose(X,-5) |echo(X,4,6) ) ,4,6) ) ) ) +transpose(arpeggio((echo(shuffle(transpose((echo(X,4,6) |transpose(X,-5) ) ,4) ) ,4,6) +transpose((step((transpose(X,-7) |transpose((X+transpose(X,-7) ) ,-5) ) ,12) |((X|X) |transpose(X,-5) ) ) ,7) ) ) ,7) ) ,4,6) +(echo(transpose((transpose(transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) ,-5) ,-5) +((shuffle(echo(X,4,6) ) |(shuffle(X) |transpose(transpose(X,-7) ,-7) ) ) +((X+transpose((X+X) ,7) ) +transpose(X,4) ) ) ) ,-5) ,4,6) +transpose(transpose((transpose(transpose(X,-5) ,-5) +echo(((transpose(transpose(transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,4) ,-5) ,4) +transpose(transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(transpose(step(transpose(X,4) ,12) ,-5) ,7) ) ,4,6) ) ,-5) ,7) ) ) ,-5) +transpose(arpeggio((step(((transpose(arpeggio((arpeggio(X) |((X+transpose(X,7) ) +transpose(X,7) ) ) ) ,4) +transpose(transpose(transpose(transpose((X+X) ,4) ,-7) ,-5) ,12) ) +(transpose(arpeggio((transpose((X|X) ,4) +transpose((transpose(X,4) +(X+transpose(X,12) ) ) ,12) ) ) ,-7) +((shuffle(transpose(step(X,12) ,4) ) +shuffle((transpose(X,-5) +transpose((X+transpose(X,12) ) ,7) ) ) ) |((((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose((transpose(X,-5) |X) ,7) ) +transpose(transpose(transpose(shuffle(X) ,4) ,4) ,12) ) +transpose(shuffle(echo(X,4,6) ) ,12) ) ) ) ) ,12) +transpose((shuffle((shuffle(arpeggio((X|(((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(step(shuffle(X) ,12) ,4) ,12) ) |arpeggio(shuffle(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ) ) ) ) ) ) +transpose(((transpose(transpose(X,4) ,-7) +step((shuffle((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) +transpose(echo(((X+transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,7) ) ,12) ) +transpose(echo((echo(X,4,6) +X) ,4,6) ,12) ) ,12) ) ) +transpose(transpose((transpose((transpose(X,4) +transpose(step(X,12) ,12) ) ,4) +step(arpeggio(((transpose(echo(X,4,6) ,-5) +((transpose(X,-5) |X) |(X+transpose(transpose(X,-5) ,7) ) ) ) +((((X+transpose(arpeggio(X) ,12) ) +transpose(step(X,12) ,4) ) +transpose((X+transpose(X,-7) ) ,7) ) +transpose(step(X,12) ,-5) ) ) ) ,12) ) ,-5) ,12) ) ,7) ) ) ,12) ) +transpose(transpose(((shuffle(transpose(((((transpose(((transpose(transpose(X,-7) ,-7) |transpose(X,-5) ) +transpose((transpose(X,-7) +transpose(step(X,12) ,12) ) ,12) ) ,-5) +transpose(((echo(transpose(X,-7) ,4,6) +transpose(transpose((transpose(X,4) +transpose(shuffle(X) ,7) ) ,-5) ,4) ) +transpose((((X+transpose(X,7) ) +transpose((shuffle(X) +(X+transpose(X,7) ) ) ,4) ) +transpose((arpeggio(X) +(transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(transpose(transpose(transpose(((X+transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) ,-5) ,-7) ,-5) ,4) ,7) ) +transpose(echo((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(X,7) ) ,4,6) ,4) ) +transpose(transpose(transpose(transpose(step(X,12) ,-5) ,4) ,4) ,7) ) ,4) ) +transpose(transpose(((((arpeggio(transpose(X,-5) ) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose(arpeggio(transpose(transpose((X+X) ,-5) ,-5) ) ,4) ) +transpose((transpose(transpose(step(X,12) ,-7) ,4) +transpose(step(step(arpeggio(echo(X,4,6) ) ,12) ,12) ,12) ) ,7) ) +step((((arpeggio(X) +transpose((X|step(X,12) ) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,12) ) ,-7) ,4) ) +transpose(echo((((transpose(((X+arpeggio(X) ) +shuffle(shuffle(step(X,12) ) ) ) ,-7) +transpose(arpeggio(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ) ,-5) ) +transpose((transpose(((((X+transpose(X,7) ) +transpose(X,12) ) +transpose(X,7) ) +((X+transpose(transpose(X,4) ,12) ) +echo((X+X) ,4,6) ) ) ,-7) +transpose((echo(shuffle(transpose(X,-5) ) ,4,6) |echo(X,4,6) ) ,12) ) ,4) ) +transpose(step(transpose(step(echo(X,4,6) ,12) ,-7) ,12) ,7) ) ,4,6) ,7) ) ,-7) ,4) ) ,4) ) +transpose(((transpose(transpose((((((echo(step((X+X) ,12) ,4,6) +transpose((((((X+X) +echo(X,4,6) ) +transpose(arpeggio(echo(X,4,6) ) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) |(((transpose(transpose(X,-7) ,4) +transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) |(arpeggio(X) |step(echo(X,4,6) ,12) ) ) ) ,12) ) +transpose((arpeggio(X) +transpose(X,7) ) ,-7) ) +((((echo(X,4,6) |echo(X,4,6) ) +transpose(shuffle(transpose((X+transpose(X,12) ) ,-7) ) ,12) ) |transpose((((X|X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ) +arpeggio((((X+transpose(X,7) ) +(X+X) ) |(transpose(X,-5) +X) ) ) ) ) +transpose(transpose(arpeggio((shuffle(transpose((X+X) ,4) ) |(shuffle(X) +transpose((X+X) ,12) ) ) ) ,-5) ,12) ) |transpose((transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) +(arpeggio(X) |((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ) ) ,-5) ) ,-5) ,-7) +transpose((transpose(transpose(echo(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,4,6) ,4) ,-7) +transpose(((transpose(transpose(arpeggio(((transpose(((X+transpose(X,-5) ) +transpose((X|X) ,-5) ) ,4) +(transpose(step(step(X,12) ,12) ,-5) |((((X+transpose(X,12) ) +shuffle(X) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(X,-7) ,7) ) ) ) +transpose(((((((X|X) +transpose(transpose(X,-5) ,7) ) |step(X,12) ) +((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) +transpose(transpose((X+transpose(shuffle(X) ,7) ) ,-7) ,12) ) ) +transpose(((shuffle((X+X) ) +transpose(X,4) ) |arpeggio((X+transpose(X,4) ) ) ) ,-5) ) +(transpose((X+(X+X) ) ,4) |((echo(X,4,6) +transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose((step(X,12) |X) ,7) ) ) ) ,12) ) ) ,-5) ,-7) +transpose((transpose(transpose(transpose(X,-7) ,-7) ,4) +transpose(transpose(transpose(arpeggio(((shuffle(echo(X,4,6) ) +shuffle((X|step(X,12) ) ) ) +(transpose(echo(transpose(X,4) ,4,6) ,4) |transpose((X+transpose(echo(X,4,6) ,12) ) ,4) ) ) ) ,4) ,-5) ,-7) ) ,4) ) +transpose(transpose(transpose(((transpose(transpose(((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ,-5) ,4) |transpose(echo((transpose(arpeggio(X) ,-5) +(X+transpose(X,7) ) ) ,4,6) ,-7) ) +transpose(transpose((((X+transpose((X+transpose(X,12) ) ,7) ) |(transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) +X) ,-7) ,4) ) ,4) ,4) ,7) ) ,12) ) ,4) ) +transpose(shuffle((step(arpeggio(shuffle(transpose(shuffle(transpose(transpose((X+transpose(step(X,12) ,7) ) ,-7) ,-5) ) ,-5) ) ) ,12) +transpose(shuffle(step((echo(transpose((transpose(arpeggio(X) ,4) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,4) ) +transpose(echo(X,4,6) ,4) ) ,12) ) ,-5) ,4,6) +transpose((step((transpose(transpose(arpeggio(X) ,-7) ,4) +transpose(step(step(transpose(X,-5) ,12) ,12) ,12) ) ,12) +shuffle(transpose(transpose((((X|X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) ,12) ) +echo(transpose(transpose(X,-7) ,-7) ,4,6) ) ,-7) ,4) ) ) ,7) ) ,12) ) ,12) ) ) ,7) ) ,7) ) +echo((transpose((echo((((((arpeggio(X) +shuffle(X) ) |transpose((X+transpose(shuffle(X) ,12) ) ,-5) ) |((transpose((X|X) ,-7) +(echo(X,4,6) +transpose(transpose(X,4) ,-7) ) ) |((transpose(X,-5) +X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ) |transpose(X,4) ) +echo(transpose((((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) +transpose(step(X,12) ,7) ) |transpose(echo(transpose(transpose(X,4) ,4) ,4,6) ,4) ) ,4) ,4,6) ) ,4,6) +((transpose(((transpose((X+(X+echo(X,4,6) ) ) ,4) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) |transpose((((X|X) +transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) ,4) ) ,4) +transpose((transpose((((((transpose(transpose(X,-5) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(step(arpeggio(X) ,12) ,4,6) ,7) ) |echo(X,4,6) ) +transpose(shuffle(transpose(step(transpose((shuffle(X) +transpose(X,12) ) ,-7) ,12) ,-7) ) ,4) ) +transpose((transpose(((arpeggio(X) +transpose(shuffle(X) ,7) ) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ,-7) |((((X+transpose(X,4) ) +transpose(X,7) ) +X) +transpose((X+step(X,12) ) ,12) ) ) ,7) ) ,-7) |(transpose(arpeggio(((((transpose(X,-5) |shuffle(X) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ) ,-5) +(((((transpose(X,-7) +(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) +transpose((transpose(X,-5) |step(X,12) ) ,4) ) +transpose(((((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,7) ) |step(transpose(step((X+transpose(X,12) ) ,12) ,-7) ,12) ) +transpose(step(transpose(echo(transpose(X,-7) ,4,6) ,4) ,12) ,7) ) ) ) ,4) ) +transpose((((transpose(((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(X,-5) ,7) ) ,-7) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose(((transpose(X,4) +transpose(transpose(transpose(shuffle(X) ,4) ,-7) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,7) ) +transpose(transpose(transpose((X+echo(X,4,6) ) ,-5) ,-5) ,4) ) ,7) ) ) ,-7) |transpose(((step(((step((transpose((X|X) ,-5) +transpose(shuffle((X+transpose(X,7) ) ) ,12) ) ,12) +transpose(((((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,12) ) |transpose((shuffle(X) +transpose(X,7) ) ,-7) ) ,12) ) +transpose((transpose((transpose((transpose(X,4) |transpose(X,4) ) ,-5) +transpose(transpose(X,4) ,-5) ) ,4) +transpose((shuffle(((transpose(X,-5) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) +transpose((((arpeggio(X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |(X|X) ) ,7) ) ) +transpose(transpose(((X+transpose(X,12) ) +transpose((X|step(X,12) ) ,7) ) ,4) ,7) ) ,7) ) ,7) ) ,12) |transpose((transpose(echo((echo(X,4,6) +transpose((X+X) ,7) ) ,4,6) ,4) +echo((X+transpose(X,7) ) ,4,6) ) ,-5) ) |((((((transpose(transpose(transpose((transpose(X,-5) |(X+X) ) ,4) ,4) ,4) +transpose((X+transpose(shuffle((X+X) ) ,7) ) ,-5) ) |((transpose(X,-5) +transpose(transpose((echo(X,4,6) |X) ,-7) ,4) ) +transpose(echo(transpose(transpose(((X+transpose(X,12) ) |X) ,-7) ,-7) ,4,6) ,7) ) ) +transpose((arpeggio((X+transpose((shuffle(X) +((X+transpose(X,12) ) +X) ) ,7) ) ) |(((transpose(X,-7) |(X|X) ) +(transpose(X,4) +(X+transpose(X,12) ) ) ) |shuffle(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ) ) ) ,7) ) +transpose(step(transpose((shuffle((X+X) ) +transpose((X+transpose(X,12) ) ,-5) ) ,-5) ,12) ,4) ) +transpose(arpeggio(step(((transpose(step((transpose(transpose(X,4) ,-5) +echo(X,4,6) ) ,12) ,-7) +transpose(step(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X|X) ) ,4) ,12) ,4) ) |arpeggio((X|echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ) ) ,12) ) ,7) ) +(transpose(echo(step(((step(X,12) |(transpose((X|X) ,4) +transpose((X+transpose(X,12) ) ,12) ) ) |((transpose((X+transpose(X,7) ) ,-5) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose((transpose(transpose(X,4) ,-7) +transpose(shuffle(X) ,-5) ) ,7) ) ) ,12) ,4,6) ,4) +transpose((((arpeggio(echo(((X|(X|X) ) +transpose(shuffle(shuffle(X) ) ,7) ) ,4,6) ) +transpose(echo((shuffle(X) |(shuffle(X) |(X|X) ) ) ,4,6) ,12) ) +arpeggio(transpose((shuffle(echo(arpeggio(X) ,4,6) ) +step((X+transpose(X,12) ) ,12) ) ,-7) ) ) +transpose((((((step(X,12) +transpose(step(X,12) ,12) ) +transpose(echo(transpose(X,4) ,4,6) ,12) ) |X) |((transpose(shuffle(((X+transpose((X+X) ,4) ) +transpose(shuffle(X) ,7) ) ) ,-7) |(X+transpose((transpose(transpose(X,-5) ,-5) +(X+X) ) ,7) ) ) +transpose(transpose(((transpose(X,-5) +echo(X,4,6) ) +echo(transpose(X,-5) ,4,6) ) ,-7) ,12) ) ) +transpose((transpose(shuffle(((X+X) |transpose(X,-7) ) ) ,-5) |transpose(((X+transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) ,12) ) ,7) ) ,12) ) ) ) ,-7) ) ,4,6) )
random seed used was 72222346

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