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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After 20 generations the expression "X" became this:
(step(transpose((step((arpeggio(transpose(((shuffle((X+X) ) |(echo((X|X) ,4,6) |(transpose(X,4) +transpose(X,12) ) ) ) +transpose(((echo((transpose(X,4) +X) ,4,6) +transpose(echo((X+transpose(step(X,12) ,7) ) ,4,6) ,4) ) +transpose(((X+X) +transpose((arpeggio(X) |X) ,12) ) ,7) ) ,7) ) ,-7) ) +transpose((((transpose(step(transpose(transpose(((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ,4) ,12) ,-7) +((((transpose(((X|transpose(X,-5) ) |(X|arpeggio(X) ) ) ,4) +transpose(transpose(transpose(((X+X) +transpose(transpose(X,-7) ,12) ) ,-7) ,-5) ,4) ) +transpose(((((((arpeggio((X+transpose(X,7) ) ) +transpose(X,4) ) +transpose(((X+transpose(X,7) ) +X) ,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,7) ) +transpose((transpose(transpose(echo(X,4,6) ,-5) ,-5) +((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(((X|X) +transpose(X,7) ) ,-7) ,4) ) +transpose(step(transpose((X|X) ,-7) ,12) ,7) ) ) ,12) ) ,7) ) |step(X,12) ) +((((transpose(transpose((X|transpose(X,-7) ) ,-7) ,4) +((X+transpose(X,7) ) +((arpeggio(X) +transpose((X|X) ,4) ) +transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ) ) +transpose(transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |arpeggio((((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) +transpose((transpose(X,-5) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose(((X+X) +X) ,7) ) ) ) ,-5) ,12) ) +transpose((echo(X,4,6) +transpose(((X|X) |transpose(X,4) ) ,4) ) ,4) ) +transpose((shuffle(transpose((transpose(X,4) |(X+transpose(X,12) ) ) ,4) ) +transpose(((transpose(X,-7) +transpose(shuffle(X) ,4) ) +transpose(step(X,12) ,7) ) ,-5) ) ,7) ) ) ) +transpose(step(transpose((((X+X) +(X+transpose((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(transpose(X,4) ,-7) ,12) ) ,7) ) ) +arpeggio(transpose(X,4) ) ) ,-7) ,12) ,4) ) +transpose(transpose(((transpose(transpose(X,-5) ,-5) +((((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(step(X,12) ,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((transpose(X,4) |(X+X) ) ,7) ) ) +transpose(((((((X|X) +transpose(X,7) ) |transpose(echo(X,4,6) ,-5) ) +(((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X|X) +X) ,7) ) ) +transpose(((echo(arpeggio(transpose(X,4) ) ,4,6) +transpose(((X|X) +(X+X) ) ,4) ) +transpose(((((X+(X|X) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) +transpose(arpeggio(((X|X) |(X+X) ) ) ,4) ) +transpose(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ,7) ) ,7) ) ,4) ) +transpose((((X|(X+X) ) +transpose(((((((X+X) |X) +((transpose(X,-5) +transpose(X,4) ) +transpose((X|X) ,7) ) ) +transpose(step(X,12) ,4) ) +transpose(transpose(((X+transpose(X,12) ) |X) ,4) ,7) ) +(echo(X,4,6) |step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,4) ) +transpose((((transpose(X,-7) +transpose((X+transpose(arpeggio(X) ,12) ) ,4) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) +transpose(transpose(X,4) ,-5) ) ,7) ) ,7) ) ,12) ) ,-5) ,7) ) ,7) ) ,12) +(step(((arpeggio((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) ) +transpose(shuffle(shuffle(X) ) ,7) ) ) +transpose(transpose(shuffle(((transpose(((X+transpose(X,12) ) |X) ,-5) +transpose(((X+(X+X) ) +((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) ) +transpose((step(transpose(((X+transpose(X,7) ) +X) ,-5) ,12) |arpeggio((transpose(X,-5) |transpose(X,4) ) ) ) ,12) ) ) ,-7) ,12) ) +echo(transpose((transpose((((X|X) +echo(X,4,6) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) +(transpose((step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,12) +transpose(arpeggio(X) ,12) ) ,4) +((arpeggio((X+X) ) |transpose((X|X) ,4) ) +transpose(((X+transpose(X,12) ) +(X|X) ) ,7) ) ) ) ,-7) ,4,6) ) ,12) +transpose(step(((transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |transpose(X,-7) ) +transpose(transpose(step(shuffle(X) ,12) ,-7) ,7) ) ,4) +transpose(arpeggio((transpose(X,4) +transpose(transpose(X,4) ,7) ) ) ,4) ) +transpose(transpose((X+transpose((transpose(transpose(X,-5) ,4) +step(transpose(X,4) ,12) ) ,7) ) ,4) ,7) ) ,12) ,7) ) ) ,-7) ,12) +transpose((((((transpose(transpose((((arpeggio(transpose(X,-7) ) +transpose(X,4) ) |transpose((X+X) ,-7) ) +echo(echo(X,4,6) ,4,6) ) ,4) ,-7) +transpose(transpose(transpose(step(step(((((transpose((X|X) ,-7) +transpose((step(X,12) +transpose(X,12) ) ,12) ) +transpose(X,4) ) +transpose((transpose(X,-7) |transpose(X,-5) ) ,7) ) +transpose(((X+transpose(echo(X,4,6) ,12) ) |transpose(X,-7) ) ,12) ) ,12) ,12) ,-5) ,-5) ,4) ) +transpose(step(transpose(transpose(shuffle((X+transpose(transpose(X,-5) ,7) ) ) ,-7) ,4) ,12) ,7) ) +transpose(transpose(((step(echo(((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,-7) ) ,4,6) ,12) |(((transpose(echo((X+X) ,4,6) ,-5) |transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ) +transpose((shuffle(X) |(((X|X) +transpose((X+transpose(transpose(X,-7) ,12) ) ,4) ) +transpose((transpose(X,-7) +transpose((X|X) ,12) ) ,7) ) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ) +transpose((transpose((transpose((transpose(X,-5) +transpose(transpose(step(X,12) ,-7) ,12) ) ,-7) +transpose(transpose((((X+X) +transpose(X,-7) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) ,-5) ,7) ) ,-5) +transpose(transpose(transpose(transpose(transpose(shuffle(X) ,4) ,-7) ,-5) ,4) ,-7) ) ,7) ) ,-5) ,4) ) +transpose((((((transpose((step((step(arpeggio((X+X) ) ,12) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) ,12) +(((echo(step((X+X) ,12) ,4,6) +transpose(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) |transpose(transpose(X,-7) ,4) ) ,4) ) +transpose(((((echo(X,4,6) |X) +transpose((shuffle(X) |transpose(X,-5) ) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) +(arpeggio(X) |echo(X,4,6) ) ) ,7) ) +((X+transpose(transpose(X,-7) ,7) ) +transpose((shuffle(X) +transpose(arpeggio(X) ,7) ) ,4) ) ) ) ,4) +transpose(transpose((step(transpose((X+X) ,4) ,12) +transpose((((arpeggio(X) +transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,12) ) +transpose(shuffle((X|X) ) ,4) ) +transpose(X,7) ) ,12) ) ,-5) ,12) ) +transpose(transpose((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) +transpose((transpose(((X|transpose(X,4) ) |echo(arpeggio(X) ,4,6) ) ,-7) +(transpose((X+transpose(X,7) ) ,-7) +transpose((transpose(X,-7) +(X|X) ) ,7) ) ) ,-5) ) ,-5) ,4) ) +transpose((step(shuffle(transpose(echo((transpose(transpose(X,4) ,-5) +transpose((X+transpose(transpose((X|X) ,4) ,12) ) ,12) ) ,4,6) ,4) ) ,12) +transpose((transpose(arpeggio((echo((X+transpose(X,7) ) ,4,6) +transpose(X,-5) ) ) ,-7) +transpose((transpose(arpeggio(transpose(X,-7) ) ,-5) +(echo(((transpose((X|X) ,4) +transpose(transpose(X,-5) ,7) ) |((transpose(X,-5) +X) +transpose(X,12) ) ) ,4,6) +transpose(step(X,12) ,-5) ) ) ,7) ) ,7) ) ,7) ) +transpose((transpose((transpose(((transpose(X,4) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4) |(echo(X,4,6) +((X+transpose(X,7) ) +(transpose(X,4) +arpeggio(X) ) ) ) ) ,-5) |transpose(transpose((transpose(transpose(X,4) ,-7) |transpose((arpeggio(X) +transpose(X,12) ) ,4) ) ,-7) ,-5) ) ,4) ) +transpose((transpose(shuffle(echo((transpose(transpose(shuffle((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ) ,-5) ,4) +(step(transpose(X,4) ,12) |(X+transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ) ) ,4,6) ) ,-7) +transpose(transpose((transpose(transpose(X,4) ,4) |(transpose(X,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ,7) ) ,7) ) ,7) ) +transpose(((((transpose((shuffle(arpeggio((X+transpose(X,12) ) ) ) +transpose((((step(echo(transpose(X,-7) ,4,6) ,12) +(shuffle(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((step(X,12) |transpose(X,4) ) ,4) ) +transpose(echo(transpose(arpeggio(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ) ,-5) ,4,6) ,7) ) ,7) ) ,-7) +(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose((X+X) ,4) ,7) ) +(transpose(transpose((X+transpose(X,7) ) ,4) ,4) |echo(X,4,6) ) ) |(transpose(((transpose((X+step(X,12) ) ,-5) +transpose((X|X) ,4) ) +transpose(shuffle((X+X) ) ,7) ) ,-7) |(((transpose(X,-7) +((X+X) +transpose(X,12) ) ) +(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,12) ) +X) ) +arpeggio(transpose((transpose((X+transpose(X,7) ) ,-5) +transpose(X,-7) ) ,4) ) ) ) ) +(transpose(transpose((transpose((((X|X) +transpose((X+X) ,4) ) +transpose(X,7) ) ,-7) +transpose(echo(((X+transpose(X,7) ) +transpose(X,12) ) ,4,6) ,4) ) ,4) ,-5) |arpeggio((transpose((X+transpose((X+X) ,7) ) ,-5) +transpose(transpose(echo((X+X) ,4,6) ,4) ,12) ) ) ) ) ) +(((step(shuffle(transpose((X+X) ,-7) ) ,12) +transpose(transpose((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) ) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) ,-7) ,7) ) +transpose((transpose(transpose((transpose(arpeggio(transpose(X,4) ) ,-7) |(X+((X+X) |transpose(shuffle(X) ,4) ) ) ) ,-7) ,-7) |transpose(echo(transpose(((transpose(transpose(X,4) ,4) |echo(X,4,6) ) |(X+transpose((X|X) ,12) ) ) ,4) ,4,6) ,4) ) ,4) ) +transpose((arpeggio(((X+transpose(X,12) ) +(X+X) ) ) +transpose(step(echo(transpose(X,-7) ,4,6) ,12) ,12) ) ,7) ) ) +transpose((transpose(echo((transpose((echo((X|X) ,4,6) |X) ,4) +transpose(transpose(transpose(echo(transpose(X,4) ,4,6) ,-5) ,4) ,-7) ) ,4,6) ,4) |(transpose((transpose(arpeggio(transpose(echo(transpose(X,-7) ,4,6) ,4) ) ,4) +transpose(transpose((transpose(transpose(transpose(X,-5) ,-7) ,-7) +transpose((X+X) ,7) ) ,-7) ,4) ) ,-5) +transpose((transpose(transpose(shuffle(arpeggio(transpose(X,-7) ) ) ,4) ,4) +(transpose(transpose(X,-5) ,4) +X) ) ,7) ) ) ,12) ) +transpose(step(shuffle(transpose((step((transpose(X,-5) |((echo(transpose(X,-7) ,4,6) +transpose(transpose(((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose(arpeggio(X) ,7) ) ,-7) ,4) ) +transpose(X,7) ) ) ,12) +transpose(echo(((transpose(transpose((step(X,12) |transpose(X,-7) ) ,-5) ,-5) +transpose(step(X,12) ,4) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose(shuffle(transpose(X,4) ) ,12) ) ,7) ) ,4,6) ,12) ) ,-5) ) ,12) ,7) ) ,4) ) ,7) )
random seed used was 214708084

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