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:
(step((transpose(((transpose(transpose(transpose(step((shuffle(transpose((echo((((X+transpose(X,12) ) +transpose((X|X) ,12) ) +transpose((X+transpose(X,7) ) ,12) ) ,4,6) |(X|shuffle(X) ) ) ,-5) ) +((step(transpose(echo(echo(arpeggio(transpose((X+transpose(X,12) ) ,-5) ) ,4,6) ,4,6) ,-7) ,12) +transpose(((transpose(X,-5) +arpeggio(transpose(X,-5) ) ) +transpose(((echo((X+transpose(X,7) ) ,4,6) +transpose(((X+transpose(X,7) ) +transpose(X,-7) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,7) ) ,-7) ) ,4) ) +transpose(((shuffle(arpeggio((transpose((X+transpose(X,7) ) ,-5) +arpeggio((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) ) ) ) ) +transpose(transpose(((echo((X+transpose(transpose(X,-7) ,12) ) ,4,6) +transpose(transpose((X|X) ,-5) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,-5) ,4) ) +transpose(step((transpose((shuffle(X) |transpose((X+X) ,-5) ) ,-5) +transpose((((X+transpose(X,7) ) |echo(X,4,6) ) +transpose(step(X,12) ,-5) ) ,7) ) ,12) ,7) ) ,7) ) ) ,12) ,-5) ,4) ,4) +transpose((((((transpose(arpeggio(echo(echo(shuffle(transpose(X,-7) ) ,4,6) ,4,6) ) ,-7) +transpose((arpeggio(arpeggio(transpose((shuffle(X) +transpose((X|X) ,7) ) ,-7) ) ) +transpose(transpose(step(transpose(X,-5) ,12) ,4) ,7) ) ,4) ) +transpose(step(((arpeggio((X|X) ) +transpose((transpose(X,-7) +transpose((X|X) ,-7) ) ,7) ) +(step(transpose(arpeggio(X) ,-7) ,12) |arpeggio(step(X,12) ) ) ) ,12) ,7) ) |transpose(transpose((shuffle(transpose(transpose(((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ,-5) ) +transpose(((arpeggio((X+transpose(X,7) ) ) +transpose(step(X,12) ,12) ) +transpose((transpose(shuffle((transpose(X,-5) |X) ) ,-5) +arpeggio(((transpose((X+transpose(X,7) ) ,4) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ) ) ,12) ) ,7) ) ,4) ,-5) ) +transpose(step(arpeggio(shuffle((X+transpose(X,7) ) ) ) ,12) ,-5) ) +transpose(transpose(arpeggio(transpose((transpose((step(X,12) +X) ,-5) +(transpose((X+transpose(X,12) ) ,-7) +transpose(transpose(transpose(transpose(X,-7) ,4) ,4) ,12) ) ) ,-7) ) ,-7) ,7) ) ,4) ) +transpose(echo((transpose(transpose((step((transpose(transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,4) ,-5) +transpose(((shuffle(transpose(X,-5) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) ,7) ) +transpose((transpose(X,-7) +transpose(transpose(shuffle(echo(X,4,6) ) ,-7) ,7) ) ,12) ) ,12) ) ,12) +transpose((((shuffle(step(echo((echo(X,4,6) +transpose(shuffle(X) ,12) ) ,4,6) ,12) ) +transpose((((X+echo(((X|X) +X) ,4,6) ) +transpose((transpose(echo(X,4,6) ,-5) |shuffle(step(transpose(X,-5) ,12) ) ) ,4) ) +transpose(transpose((transpose(step(X,12) ,-5) +shuffle((X+X) ) ) ,4) ,7) ) ,4) ) +transpose((transpose(transpose((X|(X+transpose(X,12) ) ) ,-5) ,-7) +transpose(step(((X+transpose(X,12) ) +transpose(step(arpeggio(X) ,12) ,12) ) ,12) ,12) ) ,7) ) |(transpose((X+transpose(X,7) ) ,-5) +transpose((step((transpose(X,-7) +transpose((X+X) ,12) ) ,12) +transpose(echo(transpose(echo(X,4,6) ,-5) ,4,6) ,7) ) ,12) ) ) ,7) ) ,-5) ,-7) +transpose((((((transpose((X|X) ,-7) +transpose(echo(step(X,12) ,4,6) ,7) ) |transpose((X+transpose(X,7) ) ,4) ) |transpose(step(transpose(X,-5) ,12) ,-7) ) +transpose(shuffle(step(transpose(X,-7) ,12) ) ,7) ) |(transpose(step((shuffle(((X|X) +transpose((X+transpose(X,12) ) ,12) ) ) +transpose(transpose(X,-7) ,7) ) ,12) ,-7) +(transpose(arpeggio((X+transpose(transpose(transpose(transpose(X,-5) ,-7) ,-7) ,7) ) ) ,-7) |transpose(transpose(step(((step(X,12) |step(X,12) ) +((((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,12) ,-5) ,-7) ) ) ) ,-5) ) ,4,6) ,7) ) ,-5) +transpose(transpose(arpeggio(step((transpose(arpeggio(echo(((((transpose(step(X,12) ,-5) +(echo((X+transpose(X,7) ) ,4,6) +transpose(X,12) ) ) +transpose(step(transpose(transpose(shuffle(X) ,-5) ,-7) ,12) ,4) ) +transpose(shuffle(step(echo(transpose(X,4) ,4,6) ,12) ) ,7) ) +transpose((shuffle((arpeggio((transpose(echo(X,4,6) ,-5) +transpose(step(echo(X,4,6) ,12) ,7) ) ) +transpose(transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,-5) ,7) ) ) |((step(echo(X,4,6) ,12) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(shuffle(X) ,-7) ,12) ) ) ,7) ) ,4,6) ) ,-7) +transpose(transpose(step((((((transpose(X,-7) +transpose(X,12) ) +(shuffle(X) +transpose(X,12) ) ) +transpose((step(((transpose(transpose(X,-7) ,4) +transpose(transpose(X,-7) ,4) ) +transpose(((shuffle(X) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,12) +transpose(transpose(echo(transpose(transpose(X,-5) ,-7) ,4,6) ,-5) ,7) ) ,4) ) +transpose(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose((X|(X+transpose(X,7) ) ) ,7) ) ,12) ,7) ) +transpose(((echo((((transpose(transpose(X,-7) ,-5) +transpose(transpose(X,-7) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(X,-5) ) ,7) ) +transpose(transpose((X+transpose(echo(X,4,6) ,7) ) ,-7) ,7) ) ,4,6) +transpose(transpose((shuffle(arpeggio(X) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ) ,-5) ,4) ) +transpose(echo(transpose(transpose((((X+X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ,-7) ,4,6) ,7) ) ,12) ) ,12) ,-5) ,7) ) ,12) ) ,-7) ,7) ) ,12) +transpose(((transpose(step((transpose((((((arpeggio(transpose(X,4) ) |shuffle(transpose(X,-5) ) ) +transpose(((step(X,12) +transpose(X,7) ) +transpose(X,7) ) ,-7) ) +transpose((echo(transpose(X,4) ,4,6) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,12) ) ,-5) ,12) ) ,7) ) +transpose(transpose(shuffle(arpeggio(transpose(((step(X,12) |X) +transpose(X,7) ) ,-7) ) ) ,-7) ,4) ) +transpose(step((((X+transpose((X|X) ,12) ) +transpose(transpose((((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,4) ) +transpose(transpose(arpeggio(transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ) ,-7) ,7) ) ,12) ,7) ) ,-7) +shuffle((((((arpeggio(X) +transpose(arpeggio(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,4) ) +transpose((transpose((echo(X,4,6) +transpose(step(X,12) ,12) ) ,-7) +transpose(X,7) ) ,7) ) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose(shuffle((transpose(X,-5) +transpose(X,7) ) ) ,7) ) +transpose(((((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) +transpose((step((step(X,12) +transpose(transpose(X,-7) ,12) ) ,12) +transpose((((X+transpose(transpose(X,-5) ,-7) ) |(X+transpose((X+shuffle(X) ) ,12) ) ) +transpose((arpeggio((echo(X,4,6) +transpose(transpose(X,-7) ,7) ) ) |shuffle(X) ) ,7) ) ,7) ) ,4) ) +transpose(arpeggio(((X+transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose(X,7) ) ) ,7) ) +transpose(((((((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose((arpeggio(X) +transpose(transpose(X,-5) ,7) ) ,7) ) +transpose(((arpeggio(X) +transpose((X+transpose(X,-7) ) ,4) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) ,7) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) +transpose(((transpose((arpeggio(transpose(X,-7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,4) +transpose(transpose((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,4) ) +transpose(arpeggio(transpose((transpose(X,-7) +X) ,-5) ) ,7) ) ,7) ) ,-7) ) ,7) ) ) ) ,12) ,4) +transpose(transpose((((transpose(shuffle((echo(((transpose(X,4) +transpose(((X+transpose((X|X) ,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) +step(transpose(((X+transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose((shuffle(X) +X) ,7) ) ,-5) ,12) ) ) ,4) |transpose(step(((arpeggio((transpose(X,-7) +transpose(step(X,12) ,7) ) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) +transpose((arpeggio(arpeggio(X) ) |shuffle(transpose(X,-7) ) ) ,7) ) ,12) ,-7) ) +transpose(transpose(shuffle(echo(shuffle(((((X|X) |transpose(X,-7) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,4,6) ) ,-7) ,4) ) +transpose(((((transpose((shuffle(((X+transpose(X,7) ) +step(X,12) ) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) ,-5) +transpose(step(arpeggio(arpeggio(X) ) ,12) ,4) ) +transpose(((((transpose(X,4) +(X+transpose(X,7) ) ) +transpose(((shuffle(X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,7) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose(((transpose(X,-7) +transpose(X,12) ) +transpose(step(X,12) ,7) ) ,7) ) ,7) ) +transpose((shuffle(transpose(arpeggio(transpose(X,-5) ) ,-5) ) |(((shuffle(X) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ) ,7) ) +transpose(step(((transpose(transpose((arpeggio((transpose(X,-7) +transpose(X,7) ) ) |transpose((X+transpose(X,12) ) ,-7) ) ,-5) ,4) +transpose(echo((echo(X,4,6) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,4,6) ,7) ) +transpose((shuffle(step(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ,12) ) ,12) ) ,12) ,7) ) ,7) ) ,4) ,7) ) +transpose((echo((step(echo(echo(transpose(arpeggio(shuffle((shuffle(X) +transpose(transpose(X,-5) ,12) ) ) ) ,-7) ,4,6) ,4,6) ,12) +transpose(((echo(step(shuffle(step(transpose(transpose(((transpose(X,-7) +transpose(step(X,12) ,12) ) |step(X,12) ) ,-7) ,-7) ,12) ) ,12) ,4,6) +transpose((echo(echo((echo((arpeggio(shuffle(step(echo(X,4,6) ,12) ) ) +transpose(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ,12) ) ,4,6) +transpose(step(((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) ,12) ) ,4,6) ,4,6) |transpose(step((((X+transpose(transpose(X,-5) ,7) ) +transpose(arpeggio(X) ,12) ) +(transpose((step(X,12) +transpose((X+transpose(X,7) ) ,7) ) ,-5) +transpose(transpose((X+X) ,-7) ,12) ) ) ,12) ,4) ) ,4) ) +transpose((transpose(((step(transpose((shuffle(X) |(X|X) ) ,-7) ,12) +transpose(echo((((shuffle(X) +(X|X) ) +transpose(((((X|X) +transpose(X,7) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) +(((X+transpose(transpose(X,-5) ,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4,6) ,4) ) +transpose(((shuffle(X) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio((echo(X,4,6) +transpose(echo(arpeggio(transpose(X,-5) ) ,4,6) ,12) ) ) ,12) ) ,7) ) ,-7) +((transpose(shuffle(transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-5) ,-7) ) ,-5) +transpose(transpose(shuffle(((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose((X|X) ,7) ) ) ,-7) ,12) ) +transpose(transpose(shuffle(transpose((transpose((arpeggio((X+transpose(X,7) ) ) +transpose(((transpose(step(X,12) ,-7) +transpose((X+transpose((X|X) ,12) ) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) ,7) ) ,-5) +transpose(((transpose(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) +transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,-7) ) ,-5) ,7) ) ) ,7) ) ,12) ) ,4,6) +transpose(step(((echo(step(step(transpose((step(X,12) +transpose(transpose(X,-5) ,12) ) ,-7) ,12) ,12) ,4,6) +transpose(transpose(shuffle(((transpose(arpeggio((echo(X,4,6) +step((X|transpose(X,-5) ) ,12) ) ) ,-7) +transpose(shuffle(transpose(transpose(X,-7) ,-7) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ) ,4) ,7) ) +transpose(transpose(transpose((arpeggio(arpeggio(X) ) +transpose(((transpose(transpose(shuffle(X) ,-5) ,-7) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ,12) ) +((transpose(X,-5) +transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) ) ,7) ) ,-5) ,-5) ,7) ) ,12) ,12) ) ,12) ) ,12) )
random seed used was 214346746

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