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:
Seed:
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Generations:
Phrase for X:
# of Tracks:
Randomize patches:
 

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After 20 generations the expression "X" became this:
transpose(((transpose((step(echo((((step(shuffle(transpose((X+transpose(X,7) ) ,-7) ) ,12) |echo(arpeggio(transpose(step((echo(X,4,6) +echo(X,4,6) ) ,12) ,4) ) ,4,6) ) +arpeggio(transpose(((step(X,12) |(X+transpose(X,7) ) ) +transpose(X,12) ) ,4) ) ) +transpose((shuffle(((echo(X,4,6) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose((X|(X+transpose(X,7) ) ) ,4) ) +transpose((X+X) ,7) ) +(((echo(X,4,6) +echo(X,4,6) ) +transpose((X+arpeggio(X) ) ,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ) ,4) ) +transpose(echo((shuffle(shuffle(X) ) +transpose(step(shuffle(shuffle(X) ) ,12) ,12) ) ,4,6) ,7) ) ) +transpose(arpeggio(step(transpose((X|X) ,4) ,12) ) ,12) ) ,7) ) ,4,6) ,12) +transpose(shuffle((transpose(echo((echo((((transpose(X,-5) |transpose(X,-7) ) +transpose(transpose(X,4) ,4) ) +transpose((transpose((X+transpose(X,12) ) ,-7) +transpose(((X+transpose(X,7) ) |transpose(X,-7) ) ,7) ) ,7) ) ,4,6) +transpose(step(transpose(arpeggio((X|X) ) ,-5) ,12) ,7) ) ,4,6) ,-5) +echo(((step(((X+transpose((((X+transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) |arpeggio((X|X) ) ) ,4) ) +transpose(((X|X) +transpose(X,7) ) ,7) ) ,12) +transpose(step(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +(echo(echo(X,4,6) ,4,6) |(shuffle(X) +transpose(X,7) ) ) ) ) ,12) ,4) ) +transpose(shuffle((((echo(transpose(X,4) ,4,6) +transpose((step(X,12) +transpose(((shuffle(X) +transpose((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(step(transpose(shuffle(X) ,-5) ,12) ,7) ) ,7) ) ,4) ) +transpose(arpeggio(echo(echo(X,4,6) ,4,6) ) ,7) ) |arpeggio(transpose(X,4) ) ) ) ,7) ) ,4,6) ) ) ,7) ) ,4) +transpose(arpeggio(step((shuffle(shuffle(step(shuffle((((transpose(shuffle(((echo((X+shuffle(X) ) ,4,6) +transpose(transpose(step(transpose(X,4) ,12) ,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,-7) +((arpeggio(echo(arpeggio(X) ,4,6) ) |echo(X,4,6) ) +transpose(transpose(arpeggio(transpose(step(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ,-5) ) ,4) ,7) ) ) +transpose(arpeggio(((echo(step(step(X,12) ,12) ,4,6) |step(((((X+X) +transpose(step(X,12) ,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,12) ) +transpose((echo(X,4,6) +transpose(((X+transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose(X,7) ) ,7) ) ,12) ) ) ,4) ) +transpose(transpose(((shuffle(((step(step(X,12) ,12) |(X+transpose(shuffle(X) ,7) ) ) +(X+transpose(transpose(X,-7) ,-7) ) ) ) +transpose(arpeggio(((transpose(transpose((transpose((X+X) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ,-5) +transpose(transpose((echo((X|X) ,4,6) |X) ,-7) ,4) ) +transpose(((transpose(X,4) +transpose(arpeggio((X+X) ) ,12) ) |transpose(arpeggio(X) ,4) ) ,7) ) ) ,4) ) +transpose(((((transpose(X,-5) +transpose(step((X|X) ,12) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(shuffle(echo(step(echo(X,4,6) ,12) ,4,6) ) ,4) ) +transpose(echo(step(echo(echo(shuffle(X) ,4,6) ,4,6) ,12) ,4,6) ,7) ) ,7) ) ,-5) ,7) ) ) ,12) ) ) +transpose(((((echo(transpose(shuffle((((arpeggio(step(echo(X,4,6) ,12) ) +transpose(X,4) ) +transpose((X+X) ,7) ) +shuffle(((X+transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) ) ,-7) ,4,6) +transpose(arpeggio(echo((transpose((X+X) ,-7) +transpose(step(step(X,12) ,12) ,7) ) ,4,6) ) ,7) ) +echo(transpose((((transpose(echo(arpeggio(arpeggio((X|X) ) ) ,4,6) ,-7) +transpose((shuffle(arpeggio(transpose(arpeggio(X) ,-5) ) ) +step(((X+X) +(X+transpose((X+X) ,7) ) ) ,12) ) ,-5) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(arpeggio(shuffle(transpose(transpose(X,-5) ,-7) ) ) ,7) ) ,-5) ,4,6) ) +transpose(step(((shuffle(arpeggio(step((X+transpose(X,7) ) ,12) ) ) +transpose(transpose(echo(echo(echo(transpose(transpose(echo(X,4,6) ,-7) ,-7) ,4,6) ,4,6) ,4,6) ,-7) ,4) ) +transpose(transpose(((shuffle((((X+transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ) +transpose(transpose(step(((X|X) +transpose(X,7) ) ,12) ,4) ,4) ) +transpose(transpose(((arpeggio((arpeggio(X) +(X+transpose(X,12) ) ) ) +transpose((shuffle(X) +transpose((X+X) ,7) ) ,4) ) +transpose(step(arpeggio(X) ,12) ,7) ) ,-5) ,7) ) ,-5) ,7) ) ,12) ,7) ) +transpose((((step((step((X+transpose(X,7) ) ,12) +transpose(step(((X+X) +transpose(X,4) ) ,12) ,7) ) ,12) +transpose(((transpose(shuffle((X+(X+transpose((X|X) ,12) ) ) ) ,-7) +transpose((echo((step(arpeggio((X+transpose(X,12) ) ) ,12) +transpose(transpose(X,-7) ,7) ) ,4,6) +transpose(arpeggio(transpose(((X+transpose(X,12) ) |echo(X,4,6) ) ,4) ) ,7) ) ,4) ) +transpose(((((X|(X|X) ) +(X+X) ) |echo(shuffle(X) ,4,6) ) +transpose((step((transpose((X|X) ,-7) |(transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) ,12) +transpose(arpeggio(arpeggio(transpose(X,-5) ) ) ,7) ) ,7) ) ,7) ) ,7) ) +transpose(transpose(shuffle(transpose(echo((transpose(step(X,12) ,4) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,4) ) ,4) ,7) ) |transpose((echo((transpose(((X+X) |echo(X,4,6) ) ,-5) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,7) ) |echo((X|X) ,4,6) ) +transpose((echo(shuffle(X) ,4,6) +transpose(step(arpeggio(X) ,12) ,12) ) ,12) ) ,12) ) ,4,6) +transpose(transpose(transpose(((arpeggio((X+transpose(X,12) ) ) +transpose((((transpose((X+transpose(X,7) ) ,4) |((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(shuffle((X+echo(X,4,6) ) ) ,4) ) +transpose(((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(((transpose(X,-7) +transpose(arpeggio(X) ,4) ) +transpose(transpose(((X|X) +X) ,-7) ,7) ) ,7) ) ,-5) ,4) ,4) ) ,-5) ) ,7) ) ,12) ) ,12) ) ,4) ) +transpose(transpose((arpeggio((((arpeggio((arpeggio(echo((step(X,12) +transpose(X,-7) ) ,4,6) ) |transpose(step(echo(X,4,6) ,12) ,4) ) ) +transpose(transpose((((transpose((X+X) ,4) +transpose((((transpose(step(X,12) ,4) +transpose(transpose(X,-7) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,7) ) +transpose((step(X,12) +(shuffle(transpose((X+transpose(X,7) ) ,-5) ) +transpose((transpose(X,4) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,7) ) ) ,12) ) +transpose(((X+transpose(shuffle((X+transpose(transpose(X,-5) ,7) ) ) ,4) ) +transpose(echo(echo(arpeggio(X) ,4,6) ,4,6) ,7) ) ,4) ) ,-7) ,12) ) |step(transpose(echo(shuffle(shuffle(X) ) ,4,6) ,-7) ,12) ) +transpose((((echo(transpose((((shuffle((X|X) ) +transpose((transpose(X,-5) +X) ,7) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose((transpose(X,4) +transpose((X+transpose(transpose(X,-7) ,7) ) ,7) ) ,7) ) ,-7) ,4,6) +transpose(transpose(shuffle(arpeggio(((((X+transpose((X+X) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,12) ) ) ,7) ) +transpose(echo(echo(echo(X,4,6) ,4,6) ,4,6) ,4) ) +transpose(arpeggio(transpose(step(X,12) ,4) ) ,7) ) ) ) ,-5) ,4) ) +transpose(arpeggio(transpose((shuffle((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) +transpose((echo(shuffle(transpose(echo(X,4,6) ,-5) ) ,4,6) +transpose(arpeggio(step(echo(shuffle(echo(X,4,6) ) ,4,6) ,12) ) ,12) ) ,7) ) ,-7) ) ,7) ) +arpeggio(transpose(((arpeggio((transpose(transpose((X+transpose(transpose(X,4) ,12) ) ,-7) ,-7) +transpose(transpose((((X+transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(echo((X|X) ,4,6) ,12) ) ,4) ,7) ) ) |arpeggio((((transpose(transpose(X,4) ,-5) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) ) +(step(((step(echo((shuffle(X) +transpose(X,7) ) ,4,6) ,12) +transpose(((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) +transpose((step(X,12) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) ,7) ) +transpose((transpose(transpose((X|X) ,-7) ,-5) +((arpeggio(transpose((X+X) ,4) ) +transpose(arpeggio(transpose((X+transpose(X,-7) ) ,-7) ) ,4) ) +transpose(((step(X,12) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(arpeggio(((X+X) +transpose(X,7) ) ) ,7) ) ,7) ) ) ,12) ) ,12) +transpose(((((echo(((X+(X+transpose(X,7) ) ) |transpose(transpose(X,-5) ,-5) ) ,4,6) +transpose(arpeggio(shuffle(X) ) ,7) ) +transpose(step((shuffle((X|X) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,12) ,7) ) +transpose(arpeggio((transpose(shuffle(transpose((shuffle(X) +(X+X) ) ,-5) ) ,-5) +(echo((step(X,12) +transpose((X+transpose(X,-5) ) ,7) ) ,4,6) +(echo((X+X) ,4,6) +transpose(shuffle(arpeggio((X+transpose(X,7) ) ) ) ,12) ) ) ) ) ,4) ) +transpose(step((((echo(X,4,6) +transpose((transpose((X+transpose(X,7) ) ,-5) +(X+transpose(X,7) ) ) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) +(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) +echo(echo(X,4,6) ,4,6) ) ) ,12) ,7) ) ,7) ) ) ,4) ) ) ,7) ) ) +transpose((transpose(((transpose(transpose(arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,-7) ,-7) +transpose(transpose(arpeggio(transpose(transpose(transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ,4) ,-7) ,-5) ) ,4) ,12) ) +transpose(echo((((((X+transpose(X,12) ) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) |(shuffle(shuffle(X) ) +transpose((X|X) ,7) ) ) +transpose(arpeggio((echo(((X+transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,4,6) +transpose((X+step(X,12) ) ,7) ) ) ,7) ) ,4,6) ,12) ) ,-5) +transpose(transpose(transpose((shuffle(transpose(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,4) ) +arpeggio(step((shuffle(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(transpose(echo((X|X) ,4,6) ,-7) ,7) ) ,12) ) ) ,4) ,4) ,7) ) ,12) ) ,-7) ,7) ) ,4)
random seed used was 2

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