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:
echo(transpose((transpose(transpose((((transpose(echo(shuffle(step(transpose(X,4) ,12) ) ,4,6) ,-5) +transpose(((transpose((echo((X+transpose(transpose(transpose(X,4) ,-7) ,7) ) ,4,6) +transpose(transpose((transpose(shuffle(X) ,-5) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) ,4) ,7) ) ,4) +transpose((transpose(step(transpose((X+transpose(X,7) ) ,-5) ,12) ,-5) +transpose((transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,-5) +transpose(transpose((X+X) ,-7) ,12) ) ,7) ) ,4) ) +transpose((shuffle(((X+transpose(X,12) ) +transpose((echo(X,4,6) +transpose((X+X) ,7) ) ,7) ) ) +transpose(transpose((X|X) ,-5) ,12) ) ,7) ) ,7) ) |arpeggio(((X|X) +transpose(arpeggio(X) ,7) ) ) ) |transpose(((((((((X+transpose(X,7) ) +transpose(X,7) ) +X) +transpose(step(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) ,12) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) +transpose(((transpose(transpose(transpose(transpose(X,4) ,4) ,-5) ,-5) |(transpose(transpose((X|X) ,-7) ,-7) |(transpose(transpose(transpose(X,-7) ,4) ,-5) +transpose((((X+transpose(transpose(X,-5) ,7) ) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ) ,7) ) ) ) +transpose(arpeggio((((X|X) |echo((X+X) ,4,6) ) |transpose(X,4) ) ) ,7) ) ,12) ) +transpose((((echo(transpose(arpeggio(transpose(X,-5) ) ,4) ,4,6) +transpose(transpose(((transpose(X,-5) +transpose(step(X,12) ,7) ) |shuffle((transpose(X,-7) |X) ) ) ,4) ,-7) ) +transpose(((transpose(shuffle(transpose(echo(X,4,6) ,-5) ) ,4) |transpose(transpose((((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +(X+X) ) ,4) ,4) ) +transpose((transpose(((step(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) ,12) |transpose(transpose(transpose(X,-5) ,4) ,-5) ) +transpose(transpose(transpose(echo(X,4,6) ,4) ,4) ,12) ) ,-5) |echo(((shuffle((X+transpose(X,7) ) ) +transpose(transpose(X,-5) ,12) ) +transpose(((transpose(X,4) +(X|X) ) +transpose(X,4) ) ,7) ) ,4,6) ) ,7) ) ,4) ) +transpose(((arpeggio(transpose(echo(echo((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ,4,6) ,4,6) ,-5) ) +transpose(((transpose((X|X) ,4) |transpose(shuffle((arpeggio(X) +transpose(X,4) ) ) ,-7) ) +transpose(shuffle(((X|X) +transpose(X,7) ) ) ,-5) ) ,7) ) |transpose((transpose(transpose(step((echo(X,4,6) +transpose(X,12) ) ,12) ,4) ,-7) +(echo(arpeggio(((transpose(X,4) +transpose(((X+transpose(X,7) ) +transpose((X+X) ,7) ) ,4) ) +transpose(X,7) ) ) ,4,6) +transpose(((transpose(X,-7) |X) +transpose((X|X) ,7) ) ,12) ) ) ,-7) ) ,7) ) ,4) ) +transpose(transpose((echo(transpose(transpose(shuffle(X) ,4) ,-7) ,4,6) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) |X) ,12) ) ,4) ,7) ) ,-7) ) ,-7) ,-7) +transpose(transpose((transpose(((transpose((((arpeggio(transpose(((transpose((step(X,12) +transpose(X,12) ) ,-7) +transpose((X+transpose(X,7) ) ,-7) ) +transpose((X+shuffle((X+transpose(X,12) ) ) ) ,12) ) ,-5) ) |(transpose(((transpose((transpose((X+transpose(X,12) ) ,4) |X) ,4) +(transpose(step(X,12) ,-5) +(echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) ) ) +(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ,-7) +transpose(((shuffle(X) +transpose(((X+transpose(transpose(X,-5) ,12) ) +(echo(transpose(X,4) ,4,6) |transpose(X,-5) ) ) ,7) ) +transpose(transpose(step((((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,12) ,-5) ,7) ) ,7) ) ) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,4) ) +transpose(((echo(transpose(transpose(arpeggio(echo((X|X) ,4,6) ) ,-7) ,4) ,4,6) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) |transpose(transpose(X,4) ,4) ) ,7) ) ,4) +transpose((transpose(((echo(((((X+transpose(X,7) ) +transpose(X,12) ) |(arpeggio(shuffle(X) ) +transpose((X+transpose(X,12) ) ,12) ) ) +transpose((X|(X+transpose(transpose(X,-7) ,12) ) ) ,-5) ) ,4,6) +transpose((transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-5) +transpose(X,4) ) ,12) ) |(((X+transpose(arpeggio((arpeggio(step(X,12) ) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ) ,4) ) +transpose(X,7) ) +transpose((transpose(((transpose(transpose(X,-7) ,-5) +X) |step(X,12) ) ,-5) +(transpose(X,-7) |(X+transpose(X,7) ) ) ) ,12) ) ) ,-5) +transpose(transpose((shuffle(arpeggio(transpose((X|X) ,-7) ) ) |(transpose(((((X|X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,7) ) ,-7) +((X+transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose((X+transpose(step(step(X,12) ,12) ,7) ) ,7) ) ) ) ,-7) ,7) ) ,-7) ) +echo(step((shuffle((step(transpose(step((X+X) ,12) ,-5) ,12) |transpose(((transpose((step(transpose(X,-7) ,12) +shuffle(echo(X,4,6) ) ) ,4) +transpose(((transpose((X+transpose(X,12) ) ,-5) +transpose((X+X) ,7) ) |step(transpose(shuffle(X) ,-7) ,12) ) ,4) ) +transpose((transpose(((X+X) +(X+transpose(X,7) ) ) ,4) +transpose((((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(X,4) ) ,7) ) ,7) ) ,-7) ) ) |echo((echo(((((X|X) +X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) +echo(transpose(shuffle((X+transpose((X+transpose(X,12) ) ,7) ) ) ,4) ,4,6) ) ,4,6) ) ,12) ,4,6) ) ,-5) |(transpose(echo(transpose(arpeggio((step(arpeggio(arpeggio(shuffle(X) ) ) ,12) +transpose((transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-7) +transpose(((((X+transpose(X,12) ) +transpose(X,-7) ) |X) +transpose(((X|X) +transpose((X+X) ,7) ) ,12) ) ,12) ) ,12) ) ) ,4) ,4,6) ,-7) |transpose(transpose((((transpose(shuffle((transpose((((X|X) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(shuffle(X) ,12) ) ,7) ) ,4) +step(step((X|X) ,12) ,12) ) ) ,-7) +transpose((transpose(echo(((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) |(X|X) ) +transpose(((((X|X) +transpose(X,12) ) |((X+transpose(X,12) ) +transpose(X,12) ) ) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,12) ) ,7) ) ,4,6) ,-7) |(transpose(transpose(X,-5) ,4) +(((transpose(arpeggio(X) ,-5) |(X+transpose(X,7) ) ) +transpose(transpose((X|shuffle(X) ) ,4) ,12) ) |((transpose((transpose(X,-5) |X) ,4) +transpose(echo(echo((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,4,6) ,4) ) +transpose(((((arpeggio(X) |step(X,12) ) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(X,7) ) +transpose(transpose(((X+X) +transpose(transpose(X,4) ,7) ) ,-5) ,7) ) ,7) ) ) ) ) ,7) ) +transpose(shuffle((transpose(((step(transpose(X,-7) ,12) +transpose((((echo(transpose((X+transpose(X,7) ) ,4) ,4,6) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) ) |((((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +arpeggio(transpose(X,4) ) ) ) +transpose(((echo((X+step(X,12) ) ,4,6) +transpose(echo((X+X) ,4,6) ,12) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-5) ,12) ) ,12) ) ,4) ) +transpose(((echo((echo(step(X,12) ,4,6) |transpose(transpose(X,-5) ,4) ) ,4,6) +transpose(step((transpose(transpose(X,-5) ,-5) |((X+transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ) ,12) ,4) ) +transpose(step(arpeggio((X+X) ) ,12) ,7) ) ,7) ) ,4) |((arpeggio((transpose(X,4) +((X|X) +transpose(arpeggio(X) ,12) ) ) ) +transpose(transpose(transpose(step(X,12) ,4) ,-7) ,12) ) +shuffle(arpeggio(transpose(X,-5) ) ) ) ) ) ,4) ) +transpose(((((((transpose((X+X) ,4) +transpose((step(X,12) |echo(X,4,6) ) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) |(transpose((X+transpose(X,12) ) ,4) +transpose(arpeggio(arpeggio(X) ) ,-7) ) ) +transpose((((echo(transpose(X,-7) ,4,6) +transpose((echo((X|X) ,4,6) +transpose(((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,4) ) +transpose((X+(echo(X,4,6) |transpose(X,4) ) ) ,7) ) +transpose(arpeggio(X) ,4) ) ,7) ) +transpose(((((((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(echo((X+transpose((X+transpose(X,7) ) ,12) ) ,4,6) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) +transpose(echo(transpose(transpose(shuffle(shuffle(X) ) ,-5) ,-7) ,4,6) ,7) ) +transpose((((((X+X) +(echo(transpose(X,-5) ,4,6) |(transpose(X,4) |(X+transpose(X,7) ) ) ) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(step((transpose(X,4) |transpose(X,-5) ) ,12) ,4) ) +transpose((step((X+X) ,12) |((shuffle(transpose(X,-5) ) |arpeggio(X) ) +((X+echo(X,4,6) ) +transpose(arpeggio(X) ,4) ) ) ) ,7) ) ,12) ) ,12) ) +transpose((((shuffle((((X|X) +X) |transpose(X,-5) ) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(((transpose(X,-7) +(X+transpose(X,7) ) ) +(((X+X) +transpose((X+transpose(X,7) ) ,-7) ) +transpose(transpose((X+X) ,4) ,-7) ) ) ,7) ) |((((step(X,12) |X) +transpose(shuffle(step(X,12) ) ,7) ) |transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ,7) ) ,4) ,-5) ) ) ,4) ,7) ) ,-5) ,4,6)
random seed used was 148229380

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