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:
transpose(((transpose(transpose((transpose((X|X) ,-5) +transpose(transpose(shuffle((transpose((arpeggio((X+X) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,-7) +transpose(transpose((shuffle((((X+transpose(X,12) ) |(X+X) ) +transpose((X+transpose(X,7) ) ,-7) ) ) +transpose((((transpose(X,-5) +transpose((X+transpose(X,7) ) ,-5) ) +transpose(((X+transpose(X,12) ) +echo(X,4,6) ) ,12) ) +transpose((shuffle((X|(X|X) ) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,7) ) ,12) ) ,-5) ,7) ) ) ,-5) ,7) ) ,-7) ,-7) +transpose(shuffle((((step(transpose((transpose(transpose((((X+X) +X) +transpose((transpose(X,4) +transpose(X,-5) ) ,7) ) ,-7) ,-7) |echo(((step(transpose(transpose(X,-5) ,4) ,12) +transpose(((((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +(X+transpose(X,12) ) ) ,4) ) +transpose(transpose((((X|X) +transpose(transpose(X,-5) ,7) ) +transpose((transpose(X,4) |X) ,12) ) ,-5) ,7) ) ,4,6) ) ,4) ,12) |(transpose(shuffle(transpose(((transpose(echo(echo((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,4,6) ,4) +transpose((((X+X) +transpose((echo(X,4,6) |(X+X) ) ,12) ) +transpose(transpose((((X+X) +transpose((X|X) ,4) ) +transpose(X,7) ) ,4) ,7) ) ,4) ) +transpose(((step((X+X) ,12) +transpose((((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) ,7) ) ,-5) ) ,4) |step(transpose(step((((X|echo((X|X) ,4,6) ) +(transpose((X+transpose(X,12) ) ,-5) |X) ) +transpose((transpose(echo(X,4,6) ,4) +transpose(X,-7) ) ,4) ) ,12) ,-5) ,12) ) ) +transpose(transpose(((transpose((((arpeggio(step(((X+transpose(X,12) ) |transpose(X,-5) ) ,12) ) +transpose(transpose((echo(X,4,6) +transpose(transpose(X,-5) ,12) ) ,-7) ,7) ) +transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(step(X,12) ,12) ) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,4) ) +transpose((transpose(shuffle(X) ,-7) +transpose((arpeggio((X+transpose(X,12) ) ) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ) ,12) ) ,7) ) |((transpose(X,4) +transpose((transpose(X,4) |(transpose(X,4) |(X|X) ) ) ,4) ) +transpose(shuffle(X) ,7) ) ) ,7) ) +transpose(transpose(((shuffle(X) +step(X,12) ) +transpose(transpose((X|transpose(X,-5) ) ,-7) ,7) ) ,-7) ,-5) ) ,-7) |echo(echo(((transpose(transpose((step(step(X,12) ,12) +transpose((X+transpose(X,12) ) ,12) ) ,4) ,-5) +transpose((transpose((((X+transpose(transpose(X,-7) ,4) ) +transpose(step(X,12) ,7) ) |transpose(X,-5) ) ,4) +transpose((transpose(arpeggio(transpose(transpose(X,-5) ,-7) ) ,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ,12) ) ,12) ) ,4) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ,4,6) ,4,6) ) |((shuffle(transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,-5) ) +transpose(echo(transpose(step((X+transpose(arpeggio(X) ,12) ) ,12) ,-5) ,4,6) ,4) ) +transpose(((transpose(transpose((((X|X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ,-7) +transpose((((arpeggio((X+X) ) +X) +transpose(transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,7) ) ,12) ) |(((transpose(X,4) |transpose(X,-5) ) +transpose((transpose((X+transpose(X,7) ) ,-7) |step(X,12) ) ,4) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) ,7) ) ) ,7) ) ) ,4) ,4) ) +transpose(transpose(transpose((((transpose(transpose(X,-5) ,4) |(((transpose((transpose(((X+transpose(X,12) ) +X) ,-7) |step(arpeggio(X) ,12) ) ,4) +transpose((transpose(transpose(((X+X) |echo(X,4,6) ) ,-5) ,-5) |((((((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) |echo((X+transpose(X,7) ) ,4,6) ) +transpose(((transpose(X,4) +X) |(X+shuffle(X) ) ) ,4) ) +transpose((X+X) ,7) ) +step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,12) ) ) ,12) ) +transpose(transpose(transpose(echo(((X+transpose(X,7) ) +transpose(X,4) ) ,4,6) ,4) ,-7) ,4) ) +transpose(X,7) ) ) +transpose(arpeggio(transpose((((((shuffle(echo(X,4,6) ) |echo((X+(X+transpose(X,12) ) ) ,4,6) ) +transpose(transpose((X+transpose(transpose(X,-5) ,7) ) ,4) ,4) ) +transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) ,4,6) ,7) ) +transpose(transpose(step(X,12) ,-7) ,4) ) +transpose(((((X|transpose(X,4) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((transpose((X|echo(X,4,6) ) ,-5) |shuffle(transpose(X,4) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,4) ) ,4) ) +transpose((transpose(transpose((transpose(X,-5) +transpose(X,12) ) ,-7) ,4) |(((((X|(X+X) ) +transpose((transpose(X,4) +transpose((X+X) ,7) ) ,7) ) +transpose((((X|X) +transpose((X|X) ,7) ) +transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,12) ) ,4) ) +transpose(shuffle(transpose((X+transpose(X,7) ) ,-5) ) ,7) ) +transpose(transpose(transpose(transpose((X|X) ,-7) ,-7) ,4) ,7) ) ) ,7) ) ,-5) ,-5) ,7) ) ) ,4) ) +transpose(transpose((transpose(shuffle(transpose((transpose(step(transpose(transpose(X,4) ,4) ,12) ,-5) +transpose(step(arpeggio((step(transpose(transpose(echo(X,4,6) ,-5) ,4) ,12) +transpose((transpose(arpeggio(transpose(X,4) ) ,4) +((arpeggio(echo(X,4,6) ) +transpose(((X+X) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ) ,7) ) ) ,12) ,7) ) ,-5) ) ,-5) +transpose(echo(transpose((((((((X|X) +X) |(((transpose(X,-5) +X) +transpose((X+transpose(X,7) ) ,7) ) +step(transpose((X+transpose(X,7) ) ,-7) ,12) ) ) +transpose(((echo(X,4,6) +transpose(X,7) ) +(transpose(X,4) +transpose(X,12) ) ) ,12) ) +step(shuffle(transpose((X+(X+X) ) ,-7) ) ,12) ) +transpose((((shuffle((((arpeggio(X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) |(shuffle(X) +X) ) ) +transpose((shuffle((X+(transpose(X,-5) +transpose(X,-5) ) ) ) +(((step(X,12) +transpose((X+X) ,12) ) |(transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) |transpose(X,-5) ) ) ,12) ) +shuffle(((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ) ) |(((transpose(step((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,-7) |((X+transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) |(X|((X+transpose(X,4) ) +transpose((X+X) ,7) ) ) ) ) |arpeggio(transpose(step(transpose(((transpose(echo(X,4,6) ,-5) +transpose(shuffle(shuffle(X) ) ,4) ) +transpose(X,7) ) ,-7) ,12) ,4) ) ) +((transpose(((arpeggio(transpose((X+X) ,4) ) |transpose(X,-5) ) +(step(echo((X+transpose(transpose(X,4) ,7) ) ,4,6) ,12) +shuffle(shuffle((arpeggio(X) +X) ) ) ) ) ,-7) +transpose(((transpose((transpose((((X+transpose(X,12) ) +transpose(shuffle((X|X) ) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,-5) +transpose(step((X+transpose(transpose(X,4) ,12) ) ,12) ,7) ) ,4) +transpose(arpeggio(step(transpose(X,-7) ,12) ) ,4) ) +transpose((transpose(transpose(transpose(echo(X,4,6) ,-7) ,4) ,-5) +transpose(echo(transpose(arpeggio(X) ,-5) ,4,6) ,7) ) ,7) ) ,4) ) +transpose((((X|X) +X) +(X|(X|X) ) ) ,7) ) ) ) ,4) ) +transpose(((step(transpose(((step(transpose(transpose(transpose(X,4) ,-5) ,-5) ,12) +transpose((echo(transpose(echo(X,4,6) ,-7) ,4,6) |transpose((X+transpose(step(X,12) ,7) ) ,-5) ) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ,-5) ,12) +transpose((((arpeggio((X+transpose(X,7) ) ) +transpose(arpeggio(X) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) |shuffle((X|(transpose(X,-7) |arpeggio(X) ) ) ) ) ,12) ) +shuffle(((echo(arpeggio(shuffle(((X|X) |(X+transpose(X,12) ) ) ) ) ,4,6) +transpose(arpeggio((transpose(echo((X|X) ,4,6) ,-7) |(transpose(transpose(shuffle(X) ,-7) ,4) +transpose(step(X,12) ,12) ) ) ) ,4) ) +transpose((transpose((echo(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4,6) +transpose((((X|X) +transpose((X+transpose(X,7) ) ,12) ) +transpose(X,12) ) ,7) ) ,-7) |transpose(transpose(((X+transpose(X,12) ) |X) ,-7) ,4) ) ,7) ) ) ) ,7) ) ,4) ,4,6) ,12) ) ,-7) ,7) ) ,-7)
random seed used was 234177799

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