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:
(arpeggio((((step(shuffle(transpose(shuffle(shuffle(step(X,12) ) ) ,4) ) ,12) |((((((shuffle(transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ) ,-7) ) |(transpose(arpeggio(X) ,4) |transpose(X,-7) ) ) +transpose((X|X) ,4) ) +transpose((arpeggio(arpeggio((arpeggio(X) +transpose(shuffle(X) ,12) ) ) ) +transpose(transpose(transpose((X+X) ,-7) ,-5) ,-7) ) ,7) ) +(shuffle(echo(echo(arpeggio((arpeggio(X) +transpose((shuffle(X) +X) ,7) ) ) ,4,6) ,4,6) ) +transpose(shuffle(shuffle(transpose(X,-5) ) ) ,7) ) ) +transpose(arpeggio((shuffle(transpose(echo(echo((X|X) ,4,6) ,4,6) ,-5) ) +transpose(transpose((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,-5) ,-5) ) ) ,4) ) +transpose((shuffle(arpeggio(transpose(X,-5) ) ) +transpose(shuffle(transpose(shuffle(X) ,4) ) ,7) ) ,7) ) ) |step((arpeggio(step((arpeggio((((((X+transpose(arpeggio(X) ,12) ) +transpose(shuffle(X) ,-7) ) +transpose(arpeggio((((X+transpose(step(X,12) ,12) ) +transpose(arpeggio((X|X) ) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ) ,4) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ,7) ) |transpose(transpose((X+X) ,-5) ,-7) ) ) +transpose((((((X+X) +transpose(arpeggio(X) ,12) ) +transpose(arpeggio(X) ,4) ) +transpose(((X|(X+transpose(X,12) ) ) +transpose(shuffle(((X|X) +X) ) ,12) ) ,7) ) |arpeggio((((shuffle(echo(X,4,6) ) +transpose((X|shuffle(X) ) ,12) ) +transpose((arpeggio(transpose(X,-5) ) |step(transpose(X,4) ,12) ) ,4) ) +transpose(arpeggio(((X+transpose((arpeggio(X) +(X+X) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ) ,7) ) ) ) ,12) ) ,12) ) |shuffle(transpose(step(arpeggio(shuffle((X|X) ) ) ,12) ,-7) ) ) ,12) ) +transpose((((transpose(transpose(arpeggio((((step((((step(X,12) |echo(X,4,6) ) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose((step(X,12) |arpeggio(X) ) ,7) ) ,12) +transpose((transpose((X+X) ,-7) +transpose(((X+transpose(transpose(X,-5) ,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,7) ) +transpose(transpose(shuffle((X+transpose(shuffle(X) ,12) ) ) ,-7) ,4) ) +transpose(transpose(((transpose(transpose(X,-7) ,-7) |(transpose(shuffle(X) ,-5) +transpose(arpeggio(X) ,-5) ) ) +transpose(transpose(X,-5) ,7) ) ,-5) ,7) ) ) ,-5) ,-7) +shuffle((transpose(arpeggio(transpose((echo(echo(X,4,6) ,4,6) +shuffle(X) ) ,4) ) ,-7) +transpose(((transpose(transpose(transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,12) ) ,-7) ,4) ,-5) +transpose(shuffle(shuffle(step((transpose(X,4) |echo(X,4,6) ) ,12) ) ) ,7) ) |transpose(arpeggio(transpose(transpose(transpose(shuffle(X) ,-7) ,4) ,-5) ) ,-5) ) ,7) ) ) ) +transpose(arpeggio((((transpose(transpose((((((((echo(X,4,6) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+(X+X) ) ,7) ) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ,12) ) +transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(step((X+transpose(X,12) ) ,12) ) ,7) ) +shuffle(echo(transpose(((X+transpose(X,12) ) |X) ,4) ,4,6) ) ) +transpose(shuffle((step(transpose((X+transpose(X,7) ) ,4) ,12) +transpose((((X+transpose(X,7) ) +shuffle(X) ) +transpose(shuffle(X) ,4) ) ,12) ) ) ,4) ) ,-7) ,4) +transpose(transpose(echo(transpose(transpose((transpose(X,4) +(X|X) ) ,4) ,-5) ,4,6) ,-7) ,4) ) +transpose(((shuffle((((transpose((((X+X) +transpose(X,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,-7) +transpose(transpose(step((X+X) ,12) ,-5) ,4) ) +transpose(transpose((X|step(X,12) ) ,-5) ,7) ) |((X+X) +X) ) ) |(((arpeggio(((echo(transpose(X,-7) ,4,6) +shuffle(shuffle(X) ) ) +transpose(shuffle(X) ,7) ) ) |transpose((X|shuffle(X) ) ,-7) ) +transpose(echo(arpeggio((((transpose(X,-7) |echo(X,4,6) ) +transpose(arpeggio(X) ,4) ) +transpose((X|shuffle(echo(X,4,6) ) ) ,7) ) ) ,4,6) ,4) ) +transpose(shuffle((shuffle(echo(step(X,12) ,4,6) ) +transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,-7) ) ) ,7) ) ) +transpose(transpose(shuffle((((transpose(shuffle(arpeggio((X+X) ) ) ,4) +transpose(((arpeggio(shuffle(X) ) +transpose(((X+transpose(X,12) ) +shuffle(X) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(((X+(X+transpose(X,12) ) ) +(X|X) ) ,4,6) ,7) ) +(step((transpose(X,-5) +transpose((X|X) ,12) ) ,12) +transpose(transpose(arpeggio(X) ,4) ,12) ) ) ) ,-5) ,7) ) ,7) ) +transpose(step(shuffle(((((arpeggio(transpose(X,-7) ) |(X|X) ) +transpose((transpose(X,4) +echo(arpeggio(X) ,4,6) ) ,7) ) |((transpose(transpose(X,-5) ,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +arpeggio(transpose((X+X) ,4) ) ) ) +transpose((step(X,12) +transpose(step(step(arpeggio(X) ,12) ,12) ,-7) ) ,7) ) ) ,12) ,7) ) ) ,7) ) +(transpose(arpeggio(shuffle((echo(echo(arpeggio(step(transpose(X,-5) ,12) ) ,4,6) ,4,6) +transpose((transpose(((X+X) +transpose(transpose(X,-7) ,7) ) ,-7) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,12) ) ) ) ,-7) +transpose(arpeggio(transpose(transpose(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,-7) ,-7) ) ,-5) ) ) ,12) ) ) |arpeggio((transpose((transpose(echo((shuffle(echo(arpeggio(transpose(((X|X) +transpose(transpose((X|X) ,4) ,12) ) ,4) ) ,4,6) ) +transpose(transpose(shuffle((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(shuffle(arpeggio(X) ) ,12) ) ) ,-7) ,7) ) ,4,6) ,4) +((arpeggio((transpose(transpose(arpeggio((X+X) ) ,4) ,4) +transpose(arpeggio(echo(transpose((transpose(X,-5) +transpose(X,4) ) ,-7) ,4,6) ) ,12) ) ) +arpeggio(transpose(shuffle(transpose((transpose(X,4) +(X+transpose(X,12) ) ) ,4) ) ,-7) ) ) +transpose((shuffle(((((step(X,12) |((X+transpose(X,7) ) +echo(X,4,6) ) ) +echo(step(((X+X) +transpose(echo(X,4,6) ,7) ) ,12) ,4,6) ) +transpose(X,4) ) +transpose(((echo((X+transpose(X,7) ) ,4,6) +transpose(step((((X|X) +transpose(X,12) ) |((X+transpose(X,12) ) |X) ) ,12) ,4) ) +transpose((X+transpose(((X|X) +(arpeggio(X) +transpose(X,12) ) ) ,12) ) ,7) ) ,12) ) ) +transpose(echo(((transpose(shuffle(transpose((X+transpose(X,12) ) ,4) ) ,-5) +transpose(shuffle(shuffle((transpose(X,4) +transpose((transpose(X,-7) |X) ,12) ) ) ) ,12) ) +transpose((arpeggio(arpeggio(arpeggio(transpose(X,-7) ) ) ) |transpose(arpeggio(transpose(X,4) ) ,-5) ) ,7) ) ,4,6) ,7) ) ,12) ) ) ,4) +(shuffle((step(shuffle(echo((shuffle(((shuffle(((shuffle(shuffle(X) ) +transpose(((transpose(X,-5) +transpose((X|X) ,4) ) +transpose(((X+X) +X) ,7) ) ,4) ) +transpose(((X+transpose(transpose(arpeggio(X) ,-5) ,4) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,7) ) ) +transpose((transpose(shuffle(((X+transpose((X|X) ,12) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ) ,-7) +transpose(shuffle((X+transpose((X+transpose(step(X,12) ,7) ) ,12) ) ) ,7) ) ,4) ) +transpose(((transpose((transpose((echo(X,4,6) +arpeggio(X) ) ,4) +transpose((arpeggio(X) +transpose(X,7) ) ,7) ) ,-7) +transpose(transpose(X,-5) ,4) ) +transpose(transpose((transpose(X,4) |shuffle(X) ) ,-5) ,7) ) ,7) ) ) +transpose((shuffle(shuffle(echo(arpeggio(X) ,4,6) ) ) |(((X+X) +X) |arpeggio(X) ) ) ,7) ) ,4,6) ) ,12) |arpeggio(transpose((transpose((shuffle(arpeggio(X) ) +(transpose((X+X) ,-5) +transpose(step(transpose(X,-7) ,12) ,12) ) ) ,4) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,-5) ,12) ) ,4) ) ) ) +transpose(arpeggio((transpose(transpose((transpose(transpose(arpeggio(step(arpeggio((X+X) ) ,12) ) ,-5) ,-5) +transpose((transpose(step((X+X) ,12) ,4) +transpose((((arpeggio(transpose(X,-5) ) +transpose((transpose(X,-7) +transpose(X,-5) ) ,4) ) +transpose(transpose(transpose(transpose(X,4) ,-7) ,-5) ,7) ) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) ,4) ) ,12) ) ,4) ,4) +echo((transpose(shuffle(transpose(echo(echo(X,4,6) ,4,6) ,-5) ) ,-5) +step(transpose(((X+(arpeggio(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((transpose(X,-5) +transpose(shuffle(X) ,12) ) ,12) ) ,-7) ,12) ) ,4,6) ) ) ,-7) ) ) ) )
random seed used was 238504668

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