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:
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After 20 generations the expression "X" became this:
arpeggio((((step(echo(transpose(transpose(transpose((transpose(arpeggio((step(X,12) |((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) ) ,-5) +transpose(((transpose(echo(transpose(shuffle(((transpose(X,-5) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) ) ,-5) ,4,6) ,-5) +transpose(shuffle(step(step((transpose(X,4) +transpose(step(X,12) ,7) ) ,12) ,12) ) ,4) ) +transpose((((shuffle(((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ) +transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((step(X,12) +transpose(transpose(X,-5) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,12) ) +transpose((transpose(arpeggio(echo(X,4,6) ) ,-5) |shuffle((step(step(X,12) ,12) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) ) ) ,4) ) +transpose(step(((transpose(shuffle(X) ,-7) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,12) ,7) ) ,7) ) ,7) ) ,-7) ,-7) ,-5) ,4,6) ,12) +transpose(transpose(step(transpose(transpose(step((echo(arpeggio(echo(transpose(X,-5) ,4,6) ) ,4,6) +transpose(X,12) ) ,12) ,4) ,-7) ,12) ,4) ,4) ) +transpose(((step(echo((((transpose(step(step(shuffle(step((X+transpose(X,7) ) ,12) ) ,12) ,12) ,4) |((transpose(shuffle((transpose(X,4) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ,4) ) ) ,-5) +transpose(step((((X|X) |echo(X,4,6) ) +step(step(X,12) ,12) ) ,12) ,4) ) +transpose(echo((((X|X) +X) +transpose(echo(step((X|X) ,12) ,4,6) ,12) ) ,4,6) ,7) ) ) +transpose(((shuffle((((((X|X) +transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(X,4) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) +transpose(transpose(((transpose((step(X,12) |((X+X) +transpose(X,12) ) ) ,-5) +transpose(X,4) ) +transpose(step((echo(X,4,6) +transpose(echo(X,4,6) ,7) ) ,12) ,7) ) ,4) ,4) ) +transpose(((((transpose(echo(X,4,6) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(arpeggio(X) ,12) ,7) ) +echo(X,4,6) ) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,-7) ,12) ) ,7) ) ,12) ) +shuffle(shuffle(transpose((echo(X,4,6) +transpose(arpeggio(X) ,12) ) ,4) ) ) ) ,4,6) ,12) +transpose(step((((echo(echo(arpeggio(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,4,6) +transpose((shuffle(((((transpose(step(X,12) ,4) +transpose(transpose(echo(echo(X,4,6) ,4,6) ,-7) ,4) ) +transpose(((arpeggio(X) +transpose(X,-5) ) |echo(X,4,6) ) ,7) ) +transpose((((transpose(step(X,12) ,-5) +echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +transpose((((echo(X,4,6) |step(X,12) ) +transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ,4) ) +transpose((arpeggio(((X|X) |X) ) +transpose(transpose((X|X) ,-7) ,12) ) ,7) ) ) +transpose(((transpose(echo(transpose(transpose(echo(X,4,6) ,-7) ,-7) ,4,6) ,-5) +transpose(transpose((X|(X|X) ) ,-7) ,4) ) +transpose((((step(transpose((shuffle(X) +transpose(X,-5) ) ,4) ,12) +transpose(transpose(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ,4) ) +transpose(((X|(echo(X,4,6) +transpose((shuffle(X) |X) ,7) ) ) |(transpose(shuffle(X) ,-7) +transpose(transpose(X,-7) ,7) ) ) ,4) ) +transpose(step(transpose((arpeggio(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,12) ,7) ) ,7) ) ,12) ) ,4) ) +transpose((arpeggio(step(transpose(transpose((transpose((arpeggio(X) +transpose(X,4) ) ,-7) |(((echo(X,4,6) +transpose(X,7) ) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ) ,4) ,4) ,12) ) +transpose((((echo(step(transpose(((X+transpose(X,12) ) +transpose(step(X,12) ,7) ) ,-5) ,12) ,4,6) |arpeggio(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) ,-5) ) ) +transpose(step((transpose(X,-5) |shuffle(transpose(X,-7) ) ) ,12) ,12) ) +transpose(echo((transpose(echo(transpose((((X+transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) ,-7) ,4,6) ,-7) |arpeggio(X) ) ,4,6) ,12) ) ,7) ) ,7) ) +transpose(transpose(transpose((arpeggio(shuffle(echo(transpose(X,-5) ,4,6) ) ) +((step(shuffle(X) ,12) +transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4) ) +transpose(((echo(transpose(X,-7) ,4,6) +transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) ) ,-5) ,-7) ,7) ) ,12) ,4) ) +transpose(shuffle(step(step(((arpeggio(((transpose(transpose(X,4) ,-5) +transpose((shuffle((X+(echo(X,4,6) |X) ) ) +transpose(echo((((X|X) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ,12) ) ,4) ) +transpose(arpeggio(step((X|echo((X+X) ,4,6) ) ,12) ) ,7) ) ) |step(shuffle(transpose(transpose(transpose(echo(X,4,6) ,-7) ,4) ,4) ) ,12) ) +((arpeggio((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +echo((shuffle(X) +transpose(arpeggio(X) ,12) ) ,4,6) ) ) +transpose(transpose(step(X,12) ,-7) ,4) ) +transpose(shuffle(arpeggio(((shuffle(X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ) ) ,7) ) ) ,12) ,12) ) ,7) ) ,7) ) +transpose(step(echo(echo((shuffle(arpeggio((((step(shuffle(((echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) +transpose(((arpeggio(X) +arpeggio(X) ) +transpose(((X|X) |X) ,7) ) ,4) ) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) ,12) +transpose(((step(transpose((transpose(X,4) +transpose(X,-5) ) ,4) ,12) +transpose((step(X,12) +step(X,12) ) ,4) ) +transpose(arpeggio(step((transpose(X,-5) |(X+transpose(X,12) ) ) ,12) ) ,7) ) ,4) ) +transpose((transpose(((shuffle(arpeggio(((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) ) +transpose(transpose((X+echo(X,4,6) ) ,-5) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) ) ,-7) +transpose(((transpose(((X|X) +transpose(X,12) ) ,-5) +transpose(step(((((echo(X,4,6) +transpose(arpeggio((X+X) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) +transpose(echo((step(X,12) |X) ,4,6) ,4) ) +transpose(shuffle((step(echo(X,4,6) ,12) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ) ,7) ) ,12) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,7) ) +transpose(((echo(transpose((step(step(X,12) ,12) +transpose(arpeggio(X) ,7) ) ,-7) ,4,6) +transpose((transpose(echo(transpose(X,4) ,4,6) ,-5) |echo(arpeggio((arpeggio(X) +step(X,12) ) ) ,4,6) ) ,4) ) +transpose(arpeggio(echo((((transpose(echo(X,4,6) ,4) +transpose(((X+transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(X,7) ) |echo(transpose((echo(X,4,6) |transpose(X,-5) ) ,-7) ,4,6) ) ,4,6) ) ,7) ) ,12) ) ) ) +transpose((((shuffle(((transpose(transpose(transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +(X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) ,4) ,-5) +transpose(transpose(((step(echo(X,4,6) ,12) +transpose(shuffle((arpeggio(transpose(transpose(X,-7) ,4) ) +(X|((X+transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) ) ) ) ,4) ) +transpose(arpeggio((arpeggio(step(X,12) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) |arpeggio((X|X) ) ) ) ) ,7) ) ,4) ,4) ) +transpose(shuffle((step(arpeggio(step((X+transpose(X,7) ) ,12) ) ,12) |(((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((arpeggio(echo(X,4,6) ) |((X+transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) ) ) ,7) ) ) +transpose(echo(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(echo(((X+X) +transpose(shuffle(X) ,12) ) ,4,6) ,12) ,12) ) +transpose(transpose(step(shuffle(transpose(transpose(X,-7) ,-7) ) ,12) ,-7) ,4) ) +transpose(shuffle(echo((echo(X,4,6) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ,4,6) ) ,7) ) ,-5) ,4,6) ,4) ) +transpose(echo(shuffle(transpose(((transpose(X,4) +X) |(echo(X,4,6) |(X+transpose((echo(X,4,6) +transpose((X+X) ,7) ) ,12) ) ) ) ,-5) ) ,4,6) ,7) ) +transpose(step((echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) +transpose(shuffle(((step(X,12) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,12) ) ,12) ,7) ) ,7) ) ,4,6) ,4,6) ,12) ,4) ) )
random seed used was 225819478

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