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:
(((transpose(step(step((arpeggio(echo(transpose((arpeggio(((transpose(X,-7) +transpose((echo(X,4,6) +(transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) ) ,7) ) +transpose(transpose((echo(X,4,6) +transpose(arpeggio(X) ,7) ) ,-7) ,4) ) ) |transpose((transpose(shuffle(X) ,4) +transpose(shuffle(X) ,12) ) ,-5) ) ,-7) ,4,6) ) +transpose(arpeggio((shuffle(echo(shuffle(transpose(((shuffle(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ) ,4,6) ) +((arpeggio(X) +(transpose(shuffle(shuffle(X) ) ,-5) +shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) ) ) ) +transpose((arpeggio(((transpose(X,4) |arpeggio(X) ) |((transpose(X,-7) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ) ) |((transpose((X+transpose(X,7) ) ,-5) +transpose(((X+transpose((X+transpose(X,12) ) ,12) ) |transpose(X,-7) ) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) ) ,4) ) ) ) ,12) ) ,12) ,12) ,-7) +transpose(shuffle((step(arpeggio(transpose(transpose(transpose(step(shuffle((X+transpose(X,12) ) ) ,12) ,4) ,-5) ,-5) ) ,12) |(arpeggio((step((arpeggio(transpose(X,4) ) |(X+transpose(X,-5) ) ) ,12) +((transpose((((shuffle(X) +transpose((((X+X) |shuffle(X) ) +X) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(step(step((X+transpose(X,7) ) ,12) ,12) ,7) ) ,4) +transpose((((step(transpose(echo(X,4,6) ,-5) ,12) +transpose((X+X) ,12) ) +transpose(step(echo(step(transpose(arpeggio(X) ,4) ,12) ,4,6) ,12) ,4) ) +transpose(((X|(X+X) ) |(transpose(echo(X,4,6) ,4) |transpose(X,4) ) ) ,7) ) ,4) ) +transpose((shuffle((shuffle(X) +transpose(X,12) ) ) |((transpose(X,4) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(transpose(step(echo(echo(X,4,6) ,4,6) ,12) ,-7) ,12) ) ) ,7) ) ) ) |transpose(((step(echo(X,4,6) ,12) +transpose(transpose(echo(shuffle((step(X,12) +transpose((X+X) ,7) ) ) ,4,6) ,-7) ,7) ) +((step(((echo(step(X,12) ,4,6) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,4) ,7) ) ,12) +shuffle(echo(echo(X,4,6) ,4,6) ) ) +((echo(transpose(step(transpose(X,4) ,12) ,-7) ,4,6) +echo(echo(((X|X) +X) ,4,6) ,4,6) ) |(transpose(step(transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) ,12) ,-7) |step((X+transpose((echo(X,4,6) |transpose(X,-7) ) ,12) ) ,12) ) ) ) ) ,-7) ) ) ) ,12) ) +transpose((step(shuffle((arpeggio(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-5) ) +transpose(step(transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(transpose(X,-5) ,4) ) ,-5) ,12) ,12) ) ) ,12) +((step(echo((step((echo((step(echo(step(arpeggio(X) ,12) ,4,6) ,12) +shuffle(transpose((transpose(step(X,12) ,4) +arpeggio(arpeggio(arpeggio(X) ) ) ) ,-7) ) ) ,4,6) +transpose(shuffle(transpose(arpeggio(shuffle(((transpose((X+transpose(X,12) ) ,-5) +transpose((shuffle(X) |(X+X) ) ,12) ) +(transpose(echo(X,4,6) ,4) +transpose((X|X) ,7) ) ) ) ) ,4) ) ,7) ) ,12) +transpose((step(arpeggio(transpose(X,4) ) ,12) +transpose((transpose(transpose(step(((X+X) +transpose(shuffle((X|X) ) ,7) ) ,12) ,-5) ,-5) +arpeggio((transpose(step((X|X) ,12) ,-7) |(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) |step(transpose(transpose(X,4) ,-7) ,12) ) ) ) ) ,7) ) ,12) ) ,4,6) ,12) +transpose(step((((transpose(step(((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ,12) ,4) +transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +X) +transpose((transpose(arpeggio(((X+arpeggio(X) ) |echo(X,4,6) ) ) ,-5) +transpose(transpose((echo(transpose(X,-7) ,4,6) +((X+transpose(X,12) ) +step(X,12) ) ) ,-5) ,12) ) ,4) ) +transpose((((((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(shuffle(X) ,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) +transpose(step(echo(X,4,6) ,12) ,12) ) ,7) ) +transpose(transpose((transpose(step(echo(arpeggio(X) ,4,6) ,12) ,-5) +transpose(transpose(step(arpeggio(X) ,12) ,4) ,12) ) ,4) ,4) ) +transpose(echo(((step(echo((X|step((X+X) ,12) ) ,4,6) ,12) +transpose(transpose(shuffle(step((X+transpose(transpose(X,-5) ,12) ) ,12) ) ,-7) ,4) ) +transpose(((step(arpeggio((transpose(X,-5) +transpose(X,12) ) ) ,12) +transpose(transpose((((transpose(X,-5) +transpose(step(X,12) ,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,-7) ,4) ) +transpose(step(transpose(echo(X,4,6) ,4) ,12) ,7) ) ,7) ) ,4,6) ,7) ) ,4) ) +transpose(arpeggio((shuffle(step((X+transpose((X|X) ,7) ) ,12) ) |transpose((echo(arpeggio(X) ,4,6) +(arpeggio(X) |transpose(X,-5) ) ) ,-5) ) ) ,7) ) +transpose((echo((((transpose(shuffle(((X|X) +transpose(arpeggio(X) ,7) ) ) ,-5) +transpose(((step((X|X) ,12) +transpose(echo(step(((((arpeggio(X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(step(X,12) ,7) ) ,12) ,4,6) ,4) ) +transpose(((X+transpose(step(X,12) ,12) ) +X) ,7) ) ,4) ) +transpose(((shuffle(X) |step((X|X) ,12) ) +transpose(shuffle(transpose(transpose(X,-7) ,-7) ) ,12) ) ,7) ) |echo((step((X+X) ,12) |echo(X,4,6) ) ,4,6) ) ,4,6) +arpeggio(arpeggio(echo((arpeggio(((X+transpose(X,12) ) +transpose(shuffle(X) ,7) ) ) +(shuffle(arpeggio(arpeggio(X) ) ) +transpose((echo(echo(X,4,6) ,4,6) |X) ,12) ) ) ,4,6) ) ) ) ,7) ) ,12) ,4) ) +transpose(step((echo(arpeggio((((echo(step(echo(X,4,6) ,12) ,4,6) +transpose(step((arpeggio(X) +transpose(X,7) ) ,12) ,-5) ) +transpose(arpeggio((step((X|X) ,12) |transpose(X,-5) ) ) ,4) ) +transpose(shuffle(shuffle(transpose(arpeggio(echo(X,4,6) ) ,-7) ) ) ,7) ) ) ,4,6) +transpose(echo(transpose(step((transpose((X|X) ,4) +transpose((step(arpeggio(echo(X,4,6) ) ,12) +shuffle(X) ) ,12) ) ,12) ,-5) ,4,6) ,12) ) ,12) ,7) ) ) ,7) ) |transpose(echo((transpose(echo(((step((transpose((echo((shuffle(X) +(X|X) ) ,4,6) +(echo(transpose(transpose(X,-5) ,4) ,4,6) |transpose((X+echo(X,4,6) ) ,-5) ) ) ,4) +transpose(transpose((transpose(step(echo(shuffle(X) ,4,6) ,12) ,-5) |shuffle(step(step(X,12) ,12) ) ) ,-5) ,7) ) ,12) +transpose(transpose((step((X+step(X,12) ) ,12) |arpeggio(transpose(X,-7) ) ) ,-7) ,4) ) +transpose(((echo(step(step(((echo(X,4,6) +transpose(X,4) ) +transpose(arpeggio(transpose(step(X,12) ,4) ) ,7) ) ,12) ,12) ,4,6) +transpose((transpose(((transpose(X,4) +transpose(X,12) ) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,-5) ,7) ) ,-5) +(transpose(transpose(arpeggio(step(X,12) ) ,-7) ,-5) |arpeggio(arpeggio(transpose(X,-7) ) ) ) ) ,4) ) +transpose(echo(transpose((((shuffle(X) |X) +transpose(shuffle(shuffle(X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ,4,6) ,7) ) ,7) ) ,4,6) ,4) +shuffle((((transpose(echo(step(transpose(echo((((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) |step(X,12) ) ,4,6) ,-7) ,12) ,4,6) ,-5) +transpose(transpose(transpose((((shuffle(((X|X) +shuffle(X) ) ) |shuffle(X) ) +transpose(arpeggio(echo(transpose(arpeggio(transpose(X,-5) ) ,4) ,4,6) ) ,4) ) +transpose(echo(transpose((transpose(transpose(X,4) ,-7) +transpose((shuffle(transpose(X,-5) ) +step(X,12) ) ,12) ) ,-7) ,4,6) ,7) ) ,-5) ,-7) ,4) ) +transpose(arpeggio((echo(transpose(arpeggio(transpose(X,4) ) ,-5) ,4,6) +transpose((((((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +arpeggio(arpeggio(arpeggio(shuffle(X) ) ) ) ) +transpose(echo((arpeggio(X) |transpose(X,-7) ) ,4,6) ,4) ) +transpose((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(transpose(shuffle(X) ,-5) ,7) ) |echo(step(shuffle(transpose(X,-5) ) ,12) ,4,6) ) +(transpose(shuffle(((echo(X,4,6) +transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,-5) +arpeggio(step(step(X,12) ,12) ) ) ) ,7) ) ,12) ) ) ,7) ) +transpose(((step(step((X|transpose(transpose(X,4) ,-7) ) ,12) ,12) +transpose(echo((transpose(shuffle(((transpose((X+transpose(X,7) ) ,-5) +transpose((((X|X) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) |transpose(shuffle((X+transpose(X,7) ) ) ,4) ) ) ,-5) +transpose(step(step(step(arpeggio(X) ,12) ,12) ,12) ,7) ) ,4,6) ,12) ) +transpose((step(transpose(echo(shuffle(X) ,4,6) ,-7) ,12) +transpose(echo((((X+transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) +transpose(arpeggio(arpeggio(step((X+transpose(X,12) ) ,12) ) ) ,12) ) +transpose(step(((arpeggio(echo((X+transpose(X,7) ) ,4,6) ) +step(step(transpose(X,4) ,12) ,12) ) +echo(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4,6) ) ,12) ,12) ) ,4,6) ,12) ) ,7) ) ,4) ) ) ) ,4,6) ,4) )
random seed used was 121005832

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