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:
(transpose(step(arpeggio(((echo(shuffle(transpose(arpeggio(((X+transpose(transpose(X,-7) ,12) ) +transpose(((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,7) ) ) ,4) ) ,4,6) +transpose(((((transpose(((X|(X|X) ) +X) ,-5) +transpose(echo(((X|X) +transpose(transpose(X,-7) ,12) ) ,4,6) ,4) ) +transpose(shuffle(transpose(shuffle((X+X) ) ,-5) ) ,7) ) +transpose(echo(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ,4,6) ,7) ) +transpose(((echo(echo(step(echo(arpeggio(X) ,4,6) ,12) ,4,6) ,4,6) +transpose(step((shuffle((step((echo(X,4,6) |arpeggio(X) ) ,12) +(shuffle(X) |(X|X) ) ) ) +transpose(((transpose(transpose(X,4) ,-7) |echo(X,4,6) ) +transpose(((X|X) |shuffle(X) ) ,7) ) ,12) ) ,12) ,4) ) +transpose(step(shuffle(step(echo(transpose(arpeggio(X) ,-5) ,4,6) ,12) ) ,12) ,7) ) ,7) ) ,12) ) |transpose((arpeggio(step(shuffle(step(X,12) ) ,12) ) +(step((echo(shuffle(transpose((X+transpose(X,12) ) ,4) ) ,4,6) +transpose(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,12) ) ,12) +((transpose((arpeggio(X) +shuffle(X) ) ,4) +(((X+X) +transpose(echo(X,4,6) ,7) ) |transpose(shuffle(X) ,4) ) ) +transpose(step(shuffle(transpose(X,-7) ) ,12) ,7) ) ) ) ,4) ) ) ,12) ,4) +transpose(((arpeggio(step((arpeggio(transpose(((transpose(transpose(((transpose(transpose(step(X,12) ,-7) ,4) +transpose(transpose(shuffle(echo(X,4,6) ) ,-5) ,4) ) +transpose(X,7) ) ,4) ,-5) +transpose(transpose(X,4) ,7) ) +(((step((step(X,12) +transpose(X,7) ) ,12) +transpose(echo(step(transpose((X+transpose(echo(X,4,6) ,7) ) ,4) ,12) ,4,6) ,4) ) +transpose(shuffle(transpose(shuffle(echo(X,4,6) ) ,4) ) ,7) ) |shuffle(transpose(echo((((((X+transpose(X,7) ) +X) +transpose(step(X,12) ,7) ) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose(echo((X|(X+transpose((X|X) ,12) ) ) ,4,6) ,7) ) ,4,6) ,4) ) ) ) ,4) ) +((((transpose((arpeggio(echo(transpose(transpose(arpeggio(shuffle(echo(X,4,6) ) ) ,-7) ,-5) ,4,6) ) |echo(echo(transpose(arpeggio(transpose(X,-7) ) ,4) ,4,6) ,4,6) ) ,-5) +transpose((shuffle(step(shuffle(transpose(echo(transpose(X,-5) ,4,6) ,-7) ) ,12) ) +(arpeggio(echo(((((step(transpose(X,-5) ,12) +transpose(shuffle(echo(X,4,6) ) ,12) ) |transpose(X,-5) ) |(echo(((X+X) +transpose(X,7) ) ,4,6) +((X+X) |(X|X) ) ) ) |shuffle((arpeggio(transpose(shuffle(X) ,-5) ) |step((X|X) ,12) ) ) ) ,4,6) ) +transpose(transpose(transpose(step(transpose((X+X) ,-7) ,12) ,4) ,-7) ,12) ) ) ,4) ) +transpose(arpeggio(((transpose(((((transpose(((X+step(X,12) ) +transpose(step(X,12) ,7) ) ,4) +transpose(step(transpose(X,-7) ,12) ,12) ) +transpose((transpose((transpose(X,4) |echo(X,4,6) ) ,-5) +transpose(transpose(X,-5) ,-5) ) ,4) ) +transpose(transpose(((transpose(transpose(X,-5) ,-5) +transpose((echo(X,4,6) +echo(X,4,6) ) ,4) ) +transpose(X,7) ) ,4) ,7) ) +(((X+transpose(X,12) ) +step(X,12) ) +echo((transpose(arpeggio(X) ,-5) |step(X,12) ) ,4,6) ) ) ,4) +transpose(transpose((echo(arpeggio(((X+transpose(X,12) ) +step(transpose(X,-5) ,12) ) ) ,4,6) +transpose(step((((X+transpose(step(X,12) ,4) ) +transpose((X+X) ,7) ) +transpose(step(transpose((X+transpose(X,12) ) ,4) ,12) ,7) ) ,12) ,12) ) ,-5) ,4) ) +transpose(transpose(transpose(arpeggio(step((X+X) ,12) ) ,-5) ,4) ,7) ) ) ,7) ) +transpose((transpose(shuffle((((((shuffle(step((X+X) ,12) ) +(step(((echo(X,4,6) +transpose(X,12) ) |transpose(step(X,12) ,-7) ) ,12) |echo(step(X,12) ,4,6) ) ) +transpose(transpose(step(transpose(arpeggio(X) ,-7) ,12) ,-7) ,7) ) +transpose(arpeggio(transpose((shuffle(step(X,12) ) +arpeggio(X) ) ,-7) ) ,4) ) +transpose(arpeggio(((transpose(arpeggio(echo(X,4,6) ) ,-5) +transpose(shuffle(echo(X,4,6) ) ,4) ) +transpose(transpose(shuffle(echo(X,4,6) ) ,-7) ,7) ) ) ,7) ) +transpose(((((((echo(shuffle(X) ,4,6) +transpose(X,4) ) +transpose(transpose(step(echo(X,4,6) ,12) ,-7) ,7) ) |((step(X,12) +transpose(arpeggio(X) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ) |transpose(shuffle((X|X) ) ,-5) ) +transpose(step(((echo(X,4,6) +transpose(step((X|X) ,12) ,12) ) +transpose((transpose(((X|X) |step(X,12) ) ,4) +transpose(transpose(((echo(X,4,6) |X) +transpose(((X|X) +X) ,7) ) ,-7) ,12) ) ,7) ) ,12) ,4) ) +transpose((transpose((((shuffle(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(X,-5) ,12) ) ,-5) +(echo((X+X) ,4,6) +transpose(echo(arpeggio(X) ,4,6) ,4) ) ) ,7) ) ,7) ) ) ,-5) |echo(transpose(shuffle(arpeggio(arpeggio(transpose(transpose(X,-7) ,-7) ) ) ) ,4) ,4,6) ) ,4) ) +transpose(echo(transpose(step(echo((arpeggio(echo(((arpeggio(shuffle((X|X) ) ) +transpose(echo(shuffle(shuffle(X) ) ,4,6) ,4) ) +transpose(step(transpose(arpeggio(X) ,4) ,12) ,7) ) ,4,6) ) +(step((((echo(X,4,6) +(X+transpose(X,12) ) ) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(step(arpeggio(X) ,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,12) |echo(arpeggio(((echo(X,4,6) +X) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) ,4,6) ) ) ,4,6) ,12) ,-7) ,4,6) ,7) ) ) ,12) ) +transpose(step(transpose(transpose(arpeggio(echo(((echo((echo((shuffle(X) |echo(X,4,6) ) ,4,6) +transpose(transpose((X+transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,4) ,7) ) ,4,6) +transpose(echo((echo(transpose(transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) ,4,6) ,4) ,-7) ,4,6) +transpose(step((((X+transpose(arpeggio(X) ,12) ) +transpose(transpose(arpeggio(X) ,-7) ,12) ) +((shuffle(X) +transpose(X,7) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ) ,12) ,12) ) ,4,6) ,4) ) +transpose(transpose(transpose(echo(transpose(echo(shuffle(echo(X,4,6) ) ,4,6) ,4) ,4,6) ,4) ,-7) ,7) ) ,4,6) ) ,-5) ,-5) ,12) ,4) ) +transpose(transpose((transpose((shuffle(((((step((transpose(echo(arpeggio(X) ,4,6) ,-7) +transpose(((echo(((transpose(arpeggio(transpose(X,-7) ) ,4) |arpeggio((X|X) ) ) |arpeggio(shuffle(step(X,12) ) ) ) ,4,6) +transpose(transpose((arpeggio(X) |echo(X,4,6) ) ,4) ,4) ) +transpose((arpeggio((X+transpose(X,12) ) ) +((X+transpose(X,12) ) +transpose(X,-7) ) ) ,7) ) ,12) ) ,12) +transpose(echo((shuffle(((transpose(X,4) +transpose((echo(X,4,6) +transpose(X,12) ) ,4) ) +transpose(step((X+X) ,12) ,7) ) ) |transpose(echo(echo(X,4,6) ,4,6) ,-7) ) ,4,6) ,12) ) +transpose(shuffle(transpose(arpeggio(shuffle(transpose(transpose(arpeggio(X) ,-5) ,4) ) ) ,-7) ) ,4) ) +transpose(shuffle(transpose(transpose(step(echo(echo((echo(X,4,6) |echo(X,4,6) ) ,4,6) ,4,6) ,12) ,-7) ,-7) ) ,7) ) +echo(arpeggio(step(transpose(step(transpose(X,4) ,12) ,-7) ,12) ) ,4,6) ) ) |(shuffle(shuffle(shuffle((((shuffle((X+X) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) +transpose(arpeggio(arpeggio(transpose(X,-7) ) ) ,4) ) ) ) ) +transpose((((step(step(step(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ,12) ,12) ,12) +shuffle((arpeggio(arpeggio(X) ) |step((X+transpose(X,7) ) ,12) ) ) ) +transpose(step(((arpeggio(shuffle(shuffle(X) ) ) +transpose(echo(transpose(step(transpose(X,-7) ,12) ,-7) ,4,6) ,4) ) +transpose(((transpose((((X|X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) +arpeggio(transpose(step(X,12) ,4) ) ) +(arpeggio(echo(X,4,6) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) ) ,7) ) ,12) ,7) ) +transpose(step(shuffle((((echo(X,4,6) +transpose(echo(step(transpose(step(X,12) ,-5) ,12) ,4,6) ,12) ) +transpose(transpose(step(step((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose((X+X) ,-7) ,12) ) ,12) ,12) ,4) ,7) ) |shuffle(transpose(transpose(transpose((transpose(X,4) +(X|(X+transpose(X,7) ) ) ) ,-5) ,4) ,-7) ) ) ) ,12) ,12) ) ,7) ) ) ,-7) +(step(transpose(arpeggio(step(transpose(transpose(arpeggio(step(echo(transpose((X|(echo(X,4,6) +step(X,12) ) ) ,4) ,4,6) ,12) ) ,-7) ,4) ,12) ) ,-7) ,12) |step(transpose(transpose(step(arpeggio(((step(transpose(transpose((X|X) ,-5) ,-7) ,12) +transpose(shuffle((transpose(arpeggio(X) ,-7) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ) ,12) ) |arpeggio((echo(arpeggio(echo(X,4,6) ) ,4,6) +((transpose(echo(arpeggio((X|X) ) ,4,6) ,4) +transpose((arpeggio(step(X,12) ) +transpose(X,4) ) ,4) ) +transpose((transpose((step(X,12) |X) ,-5) +(step(transpose(echo(X,4,6) ,-7) ,12) +transpose((X|X) ,4) ) ) ,7) ) ) ) ) ) ,12) ,-5) ,-5) ,12) ) ) ,4) ,7) ) ,12) )
random seed used was 3691115

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