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 20 generations the expression "X" became this:
transpose(((((step(((((((((((X+transpose(X,4) ) |shuffle((X+transpose(X,7) ) ) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) |(shuffle(X) |(transpose(X,-7) +transpose(X,7) ) ) ) |transpose(transpose(echo(X,4,6) ,-7) ,-5) ) +transpose(transpose(transpose(transpose((X|X) ,-5) ,4) ,4) ,7) ) +transpose((transpose((X+transpose(X,7) ) ,4) +transpose(transpose(arpeggio((X|X) ) ,-7) ,7) ) ,12) ) +transpose((arpeggio(shuffle(transpose(((echo(X,4,6) +transpose(step(step(X,12) ,12) ,12) ) +transpose(transpose(X,4) ,7) ) ,-5) ) ) +transpose(shuffle(((arpeggio(arpeggio(X) ) +transpose(X,4) ) +transpose((X+X) ,7) ) ) ,12) ) ,12) ) +transpose((shuffle(echo((arpeggio(X) +transpose(transpose(X,-5) ,7) ) ,4,6) ) |echo(transpose(transpose(step(arpeggio(X) ,12) ,-5) ,-5) ,4,6) ) ,7) ) |(arpeggio((transpose((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ,4) +transpose(step(transpose(X,4) ,12) ,7) ) ) |((transpose((echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) +transpose(transpose(X,4) ,7) ) ,-5) |shuffle(((transpose((X+transpose(X,12) ) ,-7) |transpose(X,-7) ) +transpose(step((X+transpose((X+transpose(X,7) ) ,7) ) ,12) ,7) ) ) ) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) ) ) ,12) |(((transpose(shuffle(transpose(arpeggio((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ) ,4) ) ,4) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,-5) ) +transpose((echo(echo(step(((transpose(shuffle(X) ,4) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(((X|transpose(X,-5) ) +transpose(X,12) ) ,7) ) ,12) ,4,6) ,4,6) +transpose(transpose((((((transpose(transpose(X,-5) ,-7) +transpose((X|transpose(X,-5) ) ,12) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose(shuffle(X) ,7) ) ,-7) ,12) ) ,12) ) +transpose(((transpose(echo((echo(transpose(transpose(((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,4) ,4,6) +transpose(((transpose(step(X,12) ,-5) +transpose((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,12) ) |transpose(transpose(X,4) ,-7) ) ,7) ) ,4,6) ,4) +transpose((transpose((transpose(transpose(((X+transpose(transpose(X,-7) ,12) ) +transpose(transpose(X,-5) ,12) ) ,-7) ,-7) +transpose(transpose(shuffle(((transpose(X,-5) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,4) ) +transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ,4) ,12) ) ,4) +(transpose(((((transpose(X,4) +transpose(X,4) ) +transpose((X|X) ,7) ) |((transpose(X,4) |X) +transpose(echo(step(X,12) ,4,6) ,12) ) ) |shuffle((echo(arpeggio(arpeggio(shuffle(X) ) ) ,4,6) +transpose(((shuffle(echo((transpose(X,4) |arpeggio(X) ) ,4,6) ) +transpose(transpose((X|(X+transpose(X,12) ) ) ,-7) ,4) ) +transpose((transpose(((X+transpose(X,7) ) |(X+transpose(X,7) ) ) ,-5) +transpose(transpose((X+transpose((arpeggio(X) +transpose(X,12) ) ,7) ) ,-7) ,7) ) ,7) ) ,7) ) ) ) ,4) |((transpose(transpose((transpose(transpose(X,4) ,4) |(X+transpose(X,12) ) ) ,-7) ,-5) +transpose(((transpose(transpose(X,-5) ,-5) +(shuffle(transpose((X+transpose(X,12) ) ,-7) ) +(X|transpose(X,4) ) ) ) +transpose((arpeggio(shuffle(transpose(X,-5) ) ) +transpose(transpose((arpeggio(X) |(X+transpose(X,12) ) ) ,-7) ,7) ) ,7) ) ,4) ) +transpose((((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,4) |((transpose(X,-7) +transpose(shuffle((X|X) ) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,12) ) +transpose((transpose(echo(X,4,6) ,4) +transpose((X+transpose(((arpeggio((X+transpose(X,7) ) ) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,7) ) ,12) ) ,7) ) ) ) ,4) ) +transpose(transpose(step((step(step((echo(((X+transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) ,4,6) +transpose(shuffle(transpose((X+transpose(X,7) ) ,-7) ) ,7) ) ,12) ,12) +transpose(arpeggio(shuffle(transpose(arpeggio((transpose((X|X) ,-5) +transpose(echo(X,4,6) ,12) ) ) ,-7) ) ) ,12) ) ,12) ,4) ,7) ) ,12) ) ) +transpose(arpeggio((((shuffle(((echo(arpeggio((transpose(transpose(step(X,12) ,4) ,-5) +transpose(transpose(shuffle(X) ,4) ,12) ) ) ,4,6) +transpose(shuffle(transpose(transpose((echo(X,4,6) +transpose(shuffle((X+X) ) ,12) ) ,4) ,-7) ) ,4) ) +transpose(echo((((transpose(transpose(transpose((arpeggio(X) +transpose(step(X,12) ,7) ) ,-5) ,4) ,-7) +transpose(transpose(shuffle(step(X,12) ) ,-5) ,12) ) |transpose((transpose(transpose(echo(X,4,6) ,-7) ,4) |((X|X) +transpose(X,7) ) ) ,-5) ) +transpose(transpose((transpose(transpose(transpose(X,-5) ,-7) ,-7) +transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,-5) ,12) ) ,4,6) ,7) ) ) +transpose(transpose(transpose((((transpose((X+transpose(X,12) ) ,4) +transpose((arpeggio(echo(X,4,6) ) +((transpose(X,-5) +transpose(step((X+transpose(transpose(X,-7) ,7) ) ,12) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-5) ,4) ,7) ) ) ,4) ) +transpose(transpose(transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) ,-7) ,-5) ,4) ,7) ) +transpose(arpeggio(echo(transpose(X,-5) ,4,6) ) ,12) ) ,-7) ,-7) ,4) ) +transpose((transpose(arpeggio((transpose((echo(((X+transpose((X|X) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) |echo(X,4,6) ) ,-7) |(transpose(X,-5) +transpose(X,12) ) ) ) ,-7) |transpose(((transpose(transpose(transpose(X,-7) ,4) ,-7) +transpose((step((X+transpose(X,12) ) ,12) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) |shuffle(transpose(((X|X) +X) ,4) ) ) ,4) ) ,7) ) +transpose(step((transpose(shuffle(arpeggio(shuffle(((transpose(step(X,12) ,4) +transpose(shuffle(X) ,4) ) +transpose(echo(transpose((X+X) ,-7) ,4,6) ,7) ) ) ) ) ,-5) |((((step(echo(transpose(X,-5) ,4,6) ,12) +transpose(transpose(X,-5) ,4) ) +transpose((transpose((X+transpose(X,12) ) ,4) +transpose(shuffle((X+X) ) ,7) ) ,7) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(transpose((X|X) ,-5) ,7) ) ,-5) ) +transpose(arpeggio(transpose(transpose((X|X) ,4) ,-7) ) ,12) ) ) ,12) ,7) ) ) ,7) ) +transpose(transpose(((transpose(transpose((transpose(step(transpose(((X+transpose((transpose(X,4) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,4) ) +transpose((transpose(X,-5) +transpose(X,7) ) ,7) ) ,4) ,12) ,4) +transpose(transpose(transpose(((X+X) +transpose((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) ,12) ) ,-5) ,-5) ,-7) ) ,4) ,4) +transpose(transpose(transpose((transpose(transpose(transpose(transpose(X,-7) ,-7) ,4) ,-5) +transpose(transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) ,4) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,4) ) ) ,7) ) ,-7) ,7) ) ,4) ,4) ,4) ) +transpose(transpose(arpeggio((transpose((transpose(((shuffle((transpose((X+transpose(X,7) ) ,-5) +transpose(X,-5) ) ) +transpose(((transpose(X,-5) +transpose(shuffle(X) ,7) ) |arpeggio((X+transpose(transpose(X,-7) ,7) ) ) ) ,7) ) +transpose(transpose((X|X) ,4) ,7) ) ,-7) |((transpose((transpose(transpose(echo((X+transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,-7) ,-7) |transpose(transpose(shuffle(((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) ,4) ,4) ) ,-5) +transpose((transpose((shuffle(((X|X) +transpose(transpose(X,-7) ,12) ) ) |transpose(X,-5) ) ,-7) +transpose((step(shuffle(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((transpose(X,4) |step(X,12) ) ,12) ) |transpose(echo(X,4,6) ,4) ) ) ,12) +transpose((echo(transpose(transpose(X,4) ,-7) ,4,6) +transpose(transpose(((((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,12) ) |transpose(X,-7) ) ,7) ) ,-5) ,12) ) ,12) ) ,12) ) ,4) ) +transpose((transpose(arpeggio(((((X+transpose(X,7) ) +transpose(X,-7) ) +transpose(step(echo(step(X,12) ,4,6) ,12) ,4) ) +transpose(echo((X|X) ,4,6) ,7) ) ) ,-5) +transpose((arpeggio(arpeggio(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,-5) ) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,12) ) ,7) ) ) ,-7) +(transpose(arpeggio(X) ,-7) +transpose(transpose(transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ,-7) ,-7) ,-7) ,12) ) ) ) ,-7) ,7) ) ,4) ,7) ) |shuffle(transpose(((step(step(echo(transpose(transpose(echo(transpose(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ,4) ,4,6) ,-5) ,-7) ,4,6) ,12) ,12) +transpose(arpeggio(((step(transpose((transpose(((transpose(transpose(shuffle((X+transpose(X,12) ) ) ,4) ,4) +transpose(transpose((X|transpose(X,-7) ) ,-5) ,4) ) +transpose(transpose(shuffle(transpose(X,4) ) ,-7) ,7) ) ,-7) +transpose(transpose((((X+transpose((X+X) ,12) ) +transpose((X|X) ,7) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ,-7) ,12) ) ,-7) ,12) +transpose(transpose(((transpose(arpeggio(((transpose(X,-7) |X) |arpeggio(step(transpose(X,-5) ,12) ) ) ) ,4) +transpose(echo(transpose((((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |transpose(transpose((X+X) ,-7) ,-7) ) |((transpose(transpose(X,-7) ,-7) +transpose(((transpose(X,4) +transpose(X,-5) ) +transpose(X,12) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ) |(transpose(X,-5) +transpose(step(transpose(X,4) ,12) ,7) ) ) ,4) ,4,6) ,4) ) +transpose((transpose(shuffle(transpose(X,-7) ) ,4) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,7) ) ,-7) ,12) ) +transpose(transpose(transpose(arpeggio(arpeggio(arpeggio(step(X,12) ) ) ) ,4) ,-5) ,7) ) ) ,12) ) +transpose((((((((((shuffle((((((transpose(X,4) +transpose(transpose(X,4) ,7) ) +transpose(transpose((echo(X,4,6) +X) ,-5) ,12) ) +transpose(step(X,12) ,12) ) +transpose(transpose(((X|X) |transpose(X,4) ) ,-7) ,4) ) +transpose(transpose(step(shuffle((X+X) ) ,12) ,4) ,7) ) ) |transpose(step((X|transpose(X,4) ) ,12) ,-5) ) +transpose(((((echo(echo(X,4,6) ,4,6) +transpose(transpose((X|arpeggio(X) ) ,-7) ,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) +transpose((X|(X+transpose(X,12) ) ) ,4) ) +transpose(transpose((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) ,-5) ,7) ) ,4) ) +transpose(transpose(arpeggio((arpeggio(X) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) ,4) ,7) ) +transpose((transpose(transpose(X,-5) ,-7) +step(((X+transpose((X|(X|X) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,12) ) +transpose(transpose(arpeggio(transpose(echo(echo(X,4,6) ,4,6) ,-5) ) ,-5) ,4) ) +transpose((transpose((((echo(X,4,6) +transpose(arpeggio(X) ,7) ) |transpose(transpose(X,4) ,4) ) +transpose(transpose(echo(((X+transpose(X,7) ) +transpose(X,12) ) ,4,6) ,4) ,7) ) ,4) +transpose(arpeggio(echo(transpose(echo(shuffle((X|X) ) ,4,6) ,-5) ,4,6) ) ,12) ) ,7) ) +transpose((transpose((((transpose(arpeggio(arpeggio(shuffle(transpose(X,-5) ) ) ) ,-7) +transpose((echo(step(transpose(X,4) ,12) ,4,6) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,-7) ) |transpose(arpeggio(((((transpose(X,-7) +X) +shuffle(X) ) |shuffle(X) ) |((shuffle(X) |transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,-5) ) |(((((transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,-7) |(((transpose((X+X) ,4) +transpose(X,4) ) |echo(echo(shuffle(X) ,4,6) ,4,6) ) |step((X+transpose(X,12) ) ,12) ) ) +transpose((shuffle(X) |arpeggio((transpose(X,-7) +((X+transpose(X,7) ) +transpose((X+X) ,12) ) ) ) ) ,4) ) +transpose(transpose(arpeggio(echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) ) ,4) ,7) ) +transpose(step((transpose(step(X,12) ,4) |((X+X) |shuffle(((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ) ) ) ,12) ,4) ) +transpose((transpose((transpose(transpose(X,4) ,-7) |arpeggio(transpose(X,4) ) ) ,4) |arpeggio(transpose(echo((X+transpose(transpose(X,-7) ,12) ) ,4,6) ,4) ) ) ,7) ) ) ,-5) +transpose(transpose((arpeggio(transpose(transpose(step((X+transpose(X,7) ) ,12) ,4) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,-7) ,12) ) ,4) ) +transpose(step(transpose(transpose(transpose(transpose(transpose(echo(transpose(X,4) ,4,6) ,-5) ,-5) ,4) ,-7) ,4) ,12) ,7) ) +transpose(transpose(step(transpose(shuffle(transpose((((((step(X,12) |(X+transpose(X,7) ) ) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose(((transpose((X+X) ,-7) |(X+transpose(X,7) ) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) |(X+transpose(X,12) ) ) ,4) ) ,-5) ,12) ,4) ,7) ) ,12) ) ,4) ) ) ,-5)
random seed used was 224754606

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