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 16 generations the expression "X" became this:
(((step(echo(shuffle(((transpose(arpeggio(transpose((transpose(X,4) |X) ,-5) ) ,-5) +transpose(echo(transpose(transpose(X,-7) ,-5) ,4,6) ,7) ) |transpose(step(transpose(arpeggio(shuffle(step(X,12) ) ) ,4) ,12) ,4) ) ) ,4,6) ,12) +transpose(step(((step(shuffle(transpose((transpose((X+X) ,-5) +(X+X) ) ,4) ) ,12) +transpose(transpose(transpose(shuffle(transpose(X,4) ) ,4) ,4) ,4) ) +transpose(transpose((echo(((transpose(transpose(X,-7) ,4) +((step(transpose(X,-7) ,12) +transpose(transpose(((X+X) |(X+transpose(X,12) ) ) ,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +transpose(transpose(((X+transpose(X,12) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,-5) ,12) ) ,4,6) +((((transpose(transpose(X,-7) ,4) +transpose(((transpose(step(X,12) ,4) +transpose(X,12) ) +step(X,12) ) ,12) ) +transpose((transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose((transpose(((X+transpose(X,12) ) +(X+X) ) ,4) +shuffle(transpose(X,-5) ) ) ,7) ) +transpose((transpose(X,-5) |((X+transpose(X,12) ) +(X+transpose(X,7) ) ) ) ,4) ) ) ,-7) ,7) ) ,12) ,12) ) +transpose(echo(transpose((step(((transpose((transpose(((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) |echo(X,4,6) ) +(transpose(X,-5) +transpose(echo(shuffle(X) ,4,6) ,7) ) ) ,-7) |((X+transpose(shuffle(X) ,7) ) +transpose(transpose(X,-7) ,4) ) ) ,-5) +transpose(arpeggio(transpose(transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ,-7) ) ,4) ) +transpose(((arpeggio((transpose(X,-5) +echo(X,4,6) ) ) +transpose(X,7) ) +transpose((transpose(transpose(X,4) ,4) +transpose(transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ,-5) ,12) ) ,12) ) ,7) ) ,12) |transpose((transpose(((((transpose(X,4) +transpose(X,4) ) |((transpose(X,-5) +transpose(X,4) ) +transpose((X+X) ,7) ) ) +transpose(((transpose(((X+X) +transpose(arpeggio(X) ,7) ) ,-7) +transpose(X,4) ) +transpose(step((X+X) ,12) ,7) ) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) +transpose(arpeggio(X) ,12) ) ,7) ) ,-5) +transpose(((arpeggio(transpose(X,-5) ) +transpose((transpose((X+transpose(X,12) ) ,4) +transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,4) ) ,12) ) ,12) ) +echo(transpose(transpose((X|X) ,4) ,4) ,4,6) ) ,7) ) ,-5) ) ,-7) ,4,6) ,12) ) +transpose((((transpose(((((transpose(((transpose((X+X) ,-5) +(transpose(X,4) |(X+transpose(X,-5) ) ) ) +(echo(X,4,6) +(((echo(X,4,6) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((shuffle(X) +arpeggio(X) ) ,7) ) ) ) ,4) +transpose(shuffle(arpeggio(echo((X+X) ,4,6) ) ) ,12) ) +transpose(transpose((transpose(((transpose(X,-5) +shuffle(X) ) +transpose((X+X) ,7) ) ,-5) +(((arpeggio(transpose(transpose(X,4) ,-5) ) +transpose(transpose(transpose(step(X,12) ,4) ,4) ,4) ) +transpose(transpose((transpose(X,4) +transpose((X+transpose(X,-5) ) ,12) ) ,4) ,7) ) |((transpose(echo(transpose(X,-7) ,4,6) ,-5) |transpose(transpose(X,-5) ,4) ) +transpose(((transpose(X,-5) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ,12) ) +transpose((X|shuffle(X) ) ,-5) ) ,7) ) ) ) ,4) ,7) ) +transpose((shuffle((echo(step(transpose(echo(X,4,6) ,-5) ,12) ,4,6) +transpose(echo((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(X,7) ) ,4,6) ,12) ) ) |transpose(step(transpose(echo(transpose(echo(X,4,6) ,4) ,4,6) ,-5) ,12) ,-5) ) ,-7) ) +shuffle((((transpose(((shuffle(X) |(transpose((X|X) ,-5) +(arpeggio(X) +shuffle(X) ) ) ) +transpose(shuffle(transpose(transpose(X,-7) ,-7) ) ,12) ) ,-5) +transpose(echo(((transpose(transpose(X,-5) ,4) |transpose(transpose(X,-7) ,-7) ) +((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose((X+shuffle(X) ) ,7) ) ) ,4,6) ,4) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) ,4) ,7) ) +transpose((transpose((((X+transpose(X,7) ) |X) +X) ,-5) +arpeggio(transpose(echo(step(transpose(transpose(transpose(X,-7) ,4) ,4) ,12) ,4,6) ,4) ) ) ,7) ) ) ) ,-7) +transpose(((step(step((transpose(arpeggio(((((X+X) +X) +transpose(X,4) ) +transpose((X+X) ,7) ) ) ,-5) |((echo((X+X) ,4,6) +transpose((transpose((X+X) ,-5) |transpose(X,4) ) ,12) ) +((X+transpose(step((X|X) ,12) ,7) ) +transpose(((((X+X) |transpose(X,-5) ) +transpose(X,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,7) ) ) ) ,12) ,12) +((echo(shuffle(transpose(transpose((echo(X,4,6) |(X|X) ) ,4) ,-5) ) ,4,6) +transpose((transpose(((transpose(echo(X,4,6) ,4) +arpeggio(echo(X,4,6) ) ) +arpeggio(transpose(step(X,12) ,-5) ) ) ,-5) |(((transpose(transpose(shuffle(X) ,-7) ,4) |(transpose(X,4) +echo(X,4,6) ) ) |arpeggio(shuffle(shuffle(X) ) ) ) +transpose(transpose(((X|echo(X,4,6) ) +transpose(((arpeggio(X) |transpose(X,-7) ) +transpose((X|transpose(X,-7) ) ,12) ) ,7) ) ,-7) ,12) ) ) ,7) ) +transpose(transpose(transpose(((echo((X+X) ,4,6) +transpose((X+transpose(X,12) ) ,7) ) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) ,4) ,-5) ,7) ) ) +(echo(echo((step((arpeggio(transpose(((X+X) +transpose(shuffle(X) ,12) ) ,4) ) |(transpose((transpose((X+X) ,-7) +transpose(transpose(X,4) ,12) ) ,-5) +transpose(transpose((echo(transpose(X,4) ,4,6) +(((X|X) +(X|X) ) +transpose((X+transpose(X,12) ) ,12) ) ) ,-5) ,7) ) ) ,12) |transpose(shuffle(shuffle(((transpose(echo(X,4,6) ,-7) |X) +transpose(X,7) ) ) ) ,-5) ) ,4,6) ,4,6) +transpose(transpose(((transpose(shuffle((X+transpose(X,12) ) ) ,4) +transpose((X|X) ,4) ) +(echo(X,4,6) +transpose(transpose(((X+arpeggio(X) ) |X) ,-7) ,7) ) ) ,-5) ,4) ) ) ,4) ) +transpose(step(transpose(arpeggio(transpose(echo(transpose(shuffle((transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) +transpose(arpeggio(X) ,7) ) ) ,-7) ,4,6) ,4) ) ,-7) ,12) ,7) ) |((step(((transpose(transpose(step((((transpose((X+transpose(X,12) ) ,4) +arpeggio((X|X) ) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) ,7) ) +((((X|X) +transpose((X|(X+transpose(X,12) ) ) ,12) ) |step(X,12) ) +transpose(transpose((X+X) ,4) ,-7) ) ) ,12) ,4) ,4) +transpose(transpose(((transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +shuffle(step(X,12) ) ) ,4) +transpose(transpose((echo(transpose((X|X) ,4) ,4,6) |transpose(echo(X,4,6) ,-7) ) ,-5) ,4) ) +transpose(step((X+transpose(X,-5) ) ,12) ,7) ) ,-5) ,4) ) +transpose(((transpose(transpose(transpose((echo(X,4,6) |(X|X) ) ,-5) ,-7) ,4) |(transpose(transpose(shuffle(X) ,-7) ,-7) +transpose((((step(transpose(transpose(X,4) ,-7) ,12) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose(echo((X|X) ,4,6) ,7) ) +((((transpose(step(X,12) ,4) +transpose(shuffle(arpeggio((X|X) ) ) ,4) ) +transpose((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose((echo(((X|X) +transpose((X|X) ,7) ) ,4,6) +transpose(echo((X|X) ,4,6) ,12) ) ,7) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ) +transpose(transpose(transpose((step(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ,12) |(X+transpose(transpose(step(X,12) ,-5) ,12) ) ) ,-5) ,-5) ,12) ) ,7) ) ,12) +transpose(transpose(transpose(shuffle(step(transpose(step((X+transpose((X|(X|X) ) ,7) ) ,12) ,-5) ,12) ) ,-5) ,-5) ,4) ) +transpose((((echo(transpose((((((X|X) +X) +X) |X) +transpose((transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) |transpose(X,-7) ) ,7) ) ,4) ,4,6) |arpeggio((transpose(transpose(((transpose(X,4) +transpose(transpose(X,4) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,-7) ,-7) +transpose(transpose(transpose((step(transpose(X,4) ,12) +((X+shuffle(X) ) +((X|X) +transpose((X|X) ,12) ) ) ) ,-5) ,-5) ,7) ) ) ) +transpose((transpose(((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) +transpose((((shuffle(X) +X) +transpose((transpose(X,-7) +transpose(X,-7) ) ,7) ) +transpose(transpose(shuffle(step(X,12) ) ,-7) ,12) ) ,4) ) +transpose(transpose(arpeggio(echo(X,4,6) ) ,4) ,7) ) ,4) +transpose(transpose((transpose((transpose(X,-7) +echo((X+transpose(X,12) ) ,4,6) ) ,-7) +transpose((transpose(echo(arpeggio((X+arpeggio(X) ) ) ,4,6) ,-7) |transpose((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,-5) ) ,12) ) ,-5) ,12) ) ,7) ) +transpose(((transpose((transpose(((transpose(X,4) +transpose((X|X) ,7) ) |transpose(X,4) ) ,4) |(arpeggio(transpose(shuffle(transpose(X,-5) ) ,4) ) |echo(transpose(shuffle(X) ,-7) ,4,6) ) ) ,-5) +transpose(step((X|(transpose(X,-5) +transpose(X,7) ) ) ,12) ,-7) ) |(transpose(transpose(transpose(X,4) ,4) ,-5) +transpose(echo(((X+transpose((((X+transpose(X,12) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) |transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) ,7) ) ,4,6) ,12) ) ) ,12) ) ,7) ) ) ,12) )
random seed used was 134580754

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