Home : Tune Toys : Expresso 
  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.

Transformations:
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After 19 generations the expression "X" became this:
step((((transpose(echo(((transpose(echo(transpose(step((arpeggio(transpose(X,4) ) +(transpose(X,-5) +transpose((X+X) ,12) ) ) ,12) ,4) ,4,6) ,-7) +transpose((((((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) +transpose((transpose(transpose(step(X,12) ,4) ,4) +transpose((X+transpose(transpose(X,4) ,-5) ) ,-7) ) ,7) ) |echo(X,4,6) ) +step(echo((transpose(X,-7) +((X+transpose(X,7) ) |arpeggio(X) ) ) ,4,6) ,12) ) +(echo(((arpeggio((((X+transpose(X,7) ) |(X+transpose(X,7) ) ) +transpose(shuffle((X|X) ) ,7) ) ) |transpose(arpeggio(transpose(transpose(X,-5) ,-5) ) ,4) ) +transpose((transpose(transpose(transpose((X|X) ,-7) ,-5) ,-7) |transpose(arpeggio(X) ,4) ) ,12) ) ,4,6) +transpose((transpose(((shuffle(X) +transpose(arpeggio(X) ,-5) ) +transpose(step((arpeggio(transpose(transpose(X,-5) ,-5) ) +transpose((echo(X,4,6) +step(X,12) ) ,12) ) ,12) ,12) ) ,-7) +transpose(transpose(arpeggio((shuffle(X) +X) ) ,-5) ,12) ) ,7) ) ) ,7) ) +transpose((arpeggio(echo((echo(step(shuffle((X+shuffle((X+X) ) ) ) ,12) ,4,6) +transpose(transpose((transpose(transpose((X|X) ,4) ,-7) +transpose(((echo(X,4,6) +transpose((step(X,12) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,4) ,4) ) ,4,6) ) +transpose((transpose((transpose(transpose(transpose(transpose(X,4) ,-7) ,-7) ,-7) +transpose(arpeggio(arpeggio((transpose((X|X) ,-7) +transpose((step(X,12) +transpose(X,12) ) ,7) ) ) ) ,7) ) ,4) +transpose(transpose(echo(transpose(((X|(X+transpose(X,7) ) ) +X) ,-7) ,4,6) ,-7) ,12) ) ,12) ) ,12) ) ,4,6) ,4) +transpose(echo((step(transpose(arpeggio(((((((X|(X|X) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(step(X,12) ,-5) ,12) ) |(transpose(X,4) |echo((X|X) ,4,6) ) ) +transpose((transpose(X,-7) +transpose(transpose(echo(arpeggio(X) ,4,6) ,4) ,12) ) ,4) ) +transpose(((arpeggio(X) +shuffle(X) ) +transpose(((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ,7) ) ) ,-5) ,12) |step((((step(transpose((echo((X+X) ,4,6) |transpose(transpose(echo(X,4,6) ,-5) ,4) ) ,-7) ,12) +transpose((((((transpose(X,-7) +transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +(X+transpose(X,7) ) ) |(step(X,12) +(X+transpose(X,7) ) ) ) +transpose(step((transpose((((X+transpose(X,12) ) +transpose((X|X) ,7) ) |echo((X|X) ,4,6) ) ,-7) |echo((transpose(X,-5) +transpose(X,7) ) ,4,6) ) ,12) ,4) ) ,7) ) |transpose(transpose((((shuffle((transpose(X,4) |X) ) +echo((shuffle(X) +transpose((step(X,12) +transpose(X,-5) ) ,12) ) ,4,6) ) +transpose((((transpose(transpose(echo(X,4,6) ,-7) ,-7) +transpose((((X+X) |X) +X) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) |transpose(X,-7) ) ,7) ) ,4) ) +transpose((arpeggio((X+X) ) +transpose((((transpose(X,4) |X) +transpose((X+X) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,-7) ) ,12) ) ,7) ) ,4) ,-7) ) |((shuffle(echo((transpose(echo((X+X) ,4,6) ,4) +(transpose(X,-5) +(((X+transpose(X,12) ) +transpose((X+X) ,12) ) +echo(transpose(X,-7) ,4,6) ) ) ) ,4,6) ) +(step(transpose(transpose(transpose(X,-5) ,-7) ,-7) ,12) +((transpose(((X|X) +transpose((echo(X,4,6) +transpose(shuffle(X) ,12) ) ,12) ) ,4) +transpose(transpose(transpose(transpose(X,-7) ,4) ,4) ,4) ) +transpose(echo((arpeggio(X) +transpose(shuffle(transpose(X,-7) ) ,12) ) ,4,6) ,7) ) ) ) |(arpeggio(((((((X+arpeggio(X) ) |transpose((X|X) ,-7) ) +transpose(echo(transpose(X,4) ,4,6) ,12) ) +((step(transpose(transpose(X,-7) ,-5) ,12) +transpose((transpose((X|X) ,-7) +transpose((transpose(X,4) +transpose(X,4) ) ,7) ) ,4) ) +transpose((((X+X) |X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) ,7) ) ,7) ) ) +transpose(transpose(arpeggio((transpose(X,-5) +(X+transpose(X,-5) ) ) ) ,4) ,7) ) +transpose(transpose(transpose(transpose(transpose(arpeggio(X) ,-5) ,-7) ,4) ,-5) ,-7) ) ) +transpose(transpose(transpose(transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,-5) ) ,-5) ,4) ,-7) ,12) ) ) ) ,12) ) ,4,6) ,12) ) +transpose(transpose(transpose((((transpose(step(arpeggio((shuffle((((transpose(X,-5) +(X|X) ) |(X+X) ) |((X+X) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ) +((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) +transpose(echo(transpose(shuffle(X) ,4) ,4,6) ,12) ) ) ) ,12) ,4) +transpose(transpose(shuffle(echo((echo((transpose(X,4) |transpose((X+transpose(X,12) ) ,-5) ) ,4,6) +transpose(transpose((((transpose((X+transpose(X,12) ) ,4) |X) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) |((transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,-7) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,4) ) +transpose((((X+transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(((X+X) +arpeggio(X) ) ,12) ) ,7) ) ) ,-5) ,7) ) ,4,6) ) ,4) ,4) ) +transpose(echo(transpose((shuffle(shuffle(X) ) +transpose(((transpose(transpose(transpose(transpose(X,4) ,4) ,-5) ,-5) |((X+X) +transpose(echo((X+transpose(transpose(X,-5) ,12) ) ,4,6) ,12) ) ) +(shuffle(transpose(((X+X) |transpose(shuffle(transpose(X,-7) ) ,4) ) ,4) ) |shuffle((arpeggio(transpose(shuffle(arpeggio(X) ) ,-7) ) |step(step((X+transpose(X,12) ) ,12) ,12) ) ) ) ) ,7) ) ,-5) ,4,6) ,7) ) +transpose((arpeggio(echo(((arpeggio((X+X) ) +transpose((X|X) ,-5) ) +transpose((transpose(X,4) +transpose(echo(X,4,6) ,7) ) ,4) ) ,4,6) ) +transpose(((((echo((X+transpose(X,-5) ) ,4,6) +transpose(arpeggio((X|X) ) ,7) ) +transpose(step(transpose(step(X,12) ,4) ,12) ,4) ) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-7) ,7) ) |transpose(((echo((X+transpose(X,7) ) ,4,6) +transpose(step((transpose((X+transpose(X,12) ) ,4) +transpose((X+transpose(step(X,12) ,12) ) ,12) ) ,12) ,12) ) +(transpose(X,4) +transpose((transpose((X+transpose(X,12) ) ,-7) +transpose(step(transpose(X,4) ,12) ,12) ) ,4) ) ) ,-5) ) ,-7) ) ,7) ) ,-5) ,-7) ,4) ) +transpose((step(echo(echo(transpose(((((arpeggio((shuffle(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,-5) ) +transpose(transpose((transpose(echo(X,4,6) ,-7) |(((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ,-5) ,12) ) ) +transpose(shuffle(echo(((step(X,12) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose((X+transpose(echo(X,4,6) ,7) ) ,7) ) ,4,6) ) ,7) ) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(step((transpose(((X+X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) +transpose((echo(transpose(X,-7) ,4,6) |transpose((X+transpose(X,12) ) ,-7) ) ,12) ) ,12) ,4) ) ) +transpose(shuffle(transpose(arpeggio(step(transpose((X+transpose(X,7) ) ,4) ,12) ) ,-5) ) ,4) ) +transpose(transpose(transpose(transpose((shuffle(X) +(X+transpose(X,7) ) ) ,4) ,-5) ,-5) ,7) ) ,-7) ,4,6) ,4,6) ,12) |(arpeggio(echo(arpeggio(transpose((transpose(X,-7) |step(X,12) ) ,4) ) ,4,6) ) +transpose(((((transpose(transpose(((transpose((X+transpose(X,7) ) ,-7) +transpose(arpeggio(((transpose(X,4) +transpose(transpose(X,-7) ,4) ) +transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) ,4) ) +transpose((transpose((transpose(X,-7) +step(X,12) ) ,-7) +transpose((X|X) ,7) ) ,7) ) ,-7) ,4) +transpose((transpose(echo((step(X,12) +transpose((X+X) ,7) ) ,4,6) ,-5) |((((X+transpose(X,12) ) +(X+X) ) |arpeggio(X) ) |((transpose(X,-7) |X) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ) ) ,4) ) +transpose((((X+X) +arpeggio(X) ) +transpose((arpeggio(transpose((X|(X+X) ) ,-7) ) +transpose(transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ,7) ) ,12) ) ,7) ) +transpose((transpose(arpeggio(echo(X,4,6) ) ,4) +transpose(step(transpose(transpose((((X+transpose(transpose(X,-7) ,12) ) +transpose((transpose(X,4) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(transpose(X,4) ,4) ) ,-5) ,-5) ,12) ,7) ) ,7) ) |(((transpose((X+transpose((X|X) ,12) ) ,-7) +(step((X+transpose(X,7) ) ,12) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ) +transpose(transpose(shuffle((shuffle(X) +transpose(((X+transpose(X,12) ) |(X+X) ) ,7) ) ) ,-5) ,12) ) +transpose(step(arpeggio(transpose(transpose((transpose((X+transpose(X,12) ) ,-5) +step((X|(X+transpose(X,7) ) ) ,12) ) ,-5) ,-5) ) ,12) ,12) ) ) ,12) ) ) ,7) ) ,12)
random seed used was 164732213

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