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:
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Phrase for X:
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After 20 generations the expression "X" became this:
((echo((((transpose((echo(transpose((step(transpose(shuffle((X+X) ) ,-5) ,12) |(arpeggio(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose((X|X) ,4) ,12) ) ) ,-5) ,4,6) +step(transpose(((echo(transpose(X,-7) ,4,6) +transpose((transpose(echo(X,4,6) ,4) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,12) ) |(((transpose(X,-7) +transpose((shuffle(X) +X) ,12) ) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,7) ) ) ,-5) ,12) ) ,-5) +transpose(transpose(transpose(arpeggio(echo(step(((((transpose(echo((X+X) ,4,6) ,-5) +transpose(transpose(step(transpose(step(X,12) ,4) ,12) ,-7) ,12) ) |shuffle(arpeggio(transpose((X+X) ,-7) ) ) ) +arpeggio((((X+transpose((X+X) ,12) ) |(X+transpose((X+transpose(X,12) ) ,12) ) ) |(((X|X) +transpose((echo(X,4,6) +X) ,7) ) +transpose(transpose(arpeggio((X|X) ) ,4) ,7) ) ) ) ) +transpose(shuffle(transpose(((X+X) +X) ,-5) ) ,4) ) ,12) ,4,6) ) ,-7) ,4) ,4) ) +transpose((echo(echo(shuffle(transpose(((echo(X,4,6) |transpose(X,4) ) |transpose(transpose((X|X) ,-7) ,-7) ) ,4) ) ,4,6) ,4,6) +step(((((transpose(transpose(X,-5) ,4) +transpose(transpose((transpose((X+transpose(X,7) ) ,-7) +transpose(transpose(((((transpose(transpose(X,-5) ,-7) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose((transpose(X,4) |shuffle(X) ) ,7) ) +transpose(echo(X,4,6) ,12) ) |transpose(transpose(X,4) ,-7) ) ,4) ,12) ) ,-7) ,4) ) +transpose((transpose(step((echo(X,4,6) +X) ,12) ,-5) +transpose(shuffle(transpose(transpose(transpose(arpeggio(X) ,4) ,4) ,4) ) ,12) ) ,7) ) +transpose(transpose((transpose(arpeggio(arpeggio(echo(X,4,6) ) ) ,-5) +shuffle((((arpeggio(X) |(X+transpose((arpeggio(X) +X) ,12) ) ) +X) +transpose(transpose(transpose(((X|X) |(X+transpose(X,12) ) ) ,-7) ,-5) ,7) ) ) ) ,-5) ,12) ) |(((((X+X) +shuffle(transpose(shuffle(X) ,-7) ) ) +transpose(echo(((echo(X,4,6) +transpose(echo((X|X) ,4,6) ,7) ) +transpose(X,12) ) ,4,6) ,-5) ) +transpose((transpose((((((step(X,12) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +(X+X) ) ,7) ) +transpose((X|X) ,7) ) |step(shuffle(X) ,12) ) ,4) |(transpose(shuffle(transpose(transpose((X+X) ,4) ,4) ) ,4) +transpose((transpose(arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +((X+transpose(X,7) ) |X) ) ) ,4) +transpose(step(transpose((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) ,4) ,12) ,-7) ) ,7) ) ) ,12) ) +transpose((echo(((transpose((X+transpose(X,12) ) ,-7) +transpose(shuffle(transpose((X+X) ,4) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,4,6) +echo((step((step(X,12) +transpose((transpose(X,-5) |(X|X) ) ,12) ) ,12) +transpose((X+transpose(X,7) ) ,-7) ) ,4,6) ) ,12) ) ) ,12) ) ,7) ) +(transpose(echo(((echo(echo((((X+transpose(X,12) ) +transpose((X|X) ,12) ) |transpose(X,4) ) ,4,6) ,4,6) +((X+X) +X) ) +(((arpeggio(transpose(transpose((X|X) ,4) ,-7) ) |(transpose(((transpose((X+X) ,-5) +transpose(transpose(step(X,12) ,-5) ,4) ) +transpose((((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +(X+transpose(X,12) ) ) ,7) ) ,4) |transpose(step(((X+X) +transpose((X|X) ,7) ) ,12) ,-5) ) ) +transpose(transpose(echo(echo(((X|shuffle(X) ) +transpose(transpose(X,-7) ,-7) ) ,4,6) ,4,6) ,4) ,4) ) +transpose(((((shuffle((transpose(X,-7) |(X+X) ) ) +transpose((X|transpose(transpose(X,-7) ,-5) ) ,4) ) +transpose((X+transpose((transpose(X,4) +X) ,7) ) ,7) ) |arpeggio(X) ) +step(transpose((echo((arpeggio(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) +transpose(transpose((transpose(X,-7) +transpose(X,12) ) ,4) ,12) ) ,-7) ,12) ) ,7) ) ) ,4,6) ,4) +((((transpose((transpose(transpose(transpose(X,4) ,4) ,-7) +((transpose(echo(X,4,6) ,-5) +transpose(echo((X|X) ,4,6) ,4) ) +transpose(((X+X) +step(X,12) ) ,7) ) ) ,-5) +transpose((((((X+X) +transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) ,12) ) +transpose(((transpose((((X+transpose(X,12) ) |shuffle(X) ) +(X+transpose(X,7) ) ) ,4) +transpose(transpose(shuffle(arpeggio(X) ) ,-7) ,12) ) +(X+X) ) ,12) ) +transpose((step((X+X) ,12) |arpeggio((X+X) ) ) ,12) ) +transpose((transpose(arpeggio(transpose(step(X,12) ,4) ) ,-5) +shuffle(shuffle(transpose((X|(X|X) ) ,4) ) ) ) ,7) ) ) ) ,4,6) +transpose(((arpeggio(step((arpeggio(transpose(transpose(transpose(transpose((arpeggio(transpose((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) |echo(transpose(((X|X) +X) ,-7) ,4,6) ) ,4) ,4) ,4) ,4) ) +transpose(transpose((transpose(((X+transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose((X+X) ,7) ) ,-7) |(((echo((X+transpose(X,12) ) ,4,6) +transpose((X+X) ,7) ) +transpose(X,4) ) +transpose(transpose((transpose(X,-5) +(X|X) ) ,4) ,7) ) ) ,-5) ,-5) ) ,12) ) +transpose(transpose(((transpose((arpeggio(step((transpose(((X+transpose(transpose((X+X) ,4) ,4) ) +transpose(((X|X) |X) ,7) ) ,-5) |transpose(arpeggio(echo((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,-5) ) ,12) ) |((((step(transpose(transpose(X,4) ,4) ,12) +arpeggio((X+X) ) ) +transpose(((transpose(X,-7) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(X,7) ) ,-7) ) |arpeggio(transpose(transpose((arpeggio(X) |X) ,-5) ,-7) ) ) +(transpose(transpose(X,-5) ,-5) |shuffle((shuffle(X) |(X+transpose(X,12) ) ) ) ) ) ) ,4) +transpose((transpose(((transpose((transpose((X+transpose(transpose(X,4) ,7) ) ,-5) |arpeggio(X) ) ,-5) +transpose((echo(X,4,6) |((transpose(X,-7) |transpose(X,-7) ) +transpose(step((X|X) ,12) ,12) ) ) ,-7) ) |((arpeggio(transpose((X+X) ,4) ) +transpose((((X|X) +transpose(X,4) ) +echo((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ) ,-5) ) |((X+transpose((X+transpose(X,7) ) ,7) ) |transpose(step((X|X) ,12) ,-5) ) ) ) ,-7) |(transpose((echo(transpose((X+X) ,-7) ,4,6) +(transpose(((X+X) +transpose(X,7) ) ,4) +transpose(((X+transpose(X,12) ) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +(X+transpose(X,7) ) ) ,12) ) ,7) ) ) ,-5) +transpose(echo((step(X,12) +transpose((transpose(X,-7) |arpeggio(X) ) ,12) ) ,4,6) ,12) ) ) ,7) ) |transpose(transpose((echo(shuffle(((echo(X,4,6) +transpose(transpose(X,-7) ,7) ) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,12) ) ) ,4,6) +(echo(transpose((echo(X,4,6) |((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ,4,6) +transpose(transpose((transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,-7) +step(step(transpose(transpose(X,4) ,-5) ,12) ,12) ) ,4) ,7) ) ) ,-5) ,-7) ) ,-7) ,4) ) +transpose(shuffle(transpose((step(transpose((echo((transpose((transpose(X,4) +transpose((X|X) ,7) ) ,-7) +transpose((transpose(X,-5) +transpose(X,7) ) ,4) ) ,4,6) +transpose((transpose(((X+step(X,12) ) +transpose((transpose(X,4) +transpose((X+X) ,7) ) ,12) ) ,4) +transpose((transpose(((((X+X) |X) +transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) +(((X+echo(X,4,6) ) +transpose(transpose((X|X) ,4) ,4) ) +transpose(transpose(transpose(((X+X) +transpose(X,12) ) ,-7) ,-7) ,7) ) ) ,7) ) ,12) ) ,-7) ,12) |transpose((transpose(transpose((transpose((X|shuffle(X) ) ,-5) |transpose(arpeggio(X) ,-7) ) ,-5) ,4) +transpose((echo(transpose(transpose(((X+transpose(X,7) ) +X) ,-5) ,-7) ,4,6) +transpose(transpose((transpose(X,4) +echo(transpose(X,-7) ,4,6) ) ,-5) ,-5) ) ,7) ) ,4) ) ,4) ) ,7) ) ,4) ) +transpose((transpose(shuffle(transpose(transpose((transpose(transpose(transpose(transpose(transpose((X+transpose(step(X,12) ,7) ) ,-5) ,-5) ,-5) ,4) ,-5) +transpose(transpose(step(((((X+(X+X) ) +(arpeggio((X+transpose(X,12) ) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) |(((((transpose(X,4) |X) +transpose(transpose(X,-5) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) +transpose(transpose(step(X,12) ,-7) ,4) ) +transpose((X+transpose(X,-5) ) ,7) ) ) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(arpeggio(transpose(X,-7) ) ,4,6) ,7) ) ,-7) ) ,12) ,-5) ,12) ) ,-5) ,4) ) ,-7) |transpose(echo(arpeggio(transpose(transpose(transpose(shuffle((shuffle(X) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ) ,4) ,4) ,-5) ) ,4,6) ,-7) ) ,7) )
random seed used was 225039680

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