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 13 generations the expression "X" became this:
(((transpose((transpose(arpeggio(((step((transpose(((X+transpose(X,7) ) +X) ,-7) +((echo((X+X) ,4,6) +transpose(shuffle(X) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ) ,12) +transpose(echo((transpose(transpose(X,-7) ,4) |(transpose(X,-7) +transpose((X+X) ,12) ) ) ,4,6) ,4) ) +transpose((arpeggio(transpose(X,-5) ) +transpose(transpose(arpeggio(transpose(X,-7) ) ,-7) ,12) ) ,7) ) ) ,-5) |(echo((transpose(X,-5) +(((X+transpose(X,12) ) +transpose(((X+X) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) ,4,6) +transpose((X+transpose((X+X) ,7) ) ,-7) ) ) ,-5) |(((((transpose(arpeggio((X+X) ) ,4) |(shuffle(X) +(X+transpose(X,7) ) ) ) +transpose(transpose(transpose(((X+X) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ,4) ,7) ) |step(transpose(transpose((arpeggio(transpose(X,-7) ) +transpose(X,-5) ) ,-5) ,-5) ,12) ) +((((step(transpose(shuffle(X) ,4) ,12) +transpose(echo(X,4,6) ,12) ) +(transpose(X,-5) +transpose(step(X,12) ,12) ) ) +transpose((transpose((shuffle(arpeggio(transpose(shuffle(X) ,4) ) ) +transpose(((X+transpose(X,-5) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,12) ) ,7) ) ,-5) +echo(transpose(step(((X+transpose(X,12) ) |transpose(X,4) ) ,12) ,-7) ,4,6) ) ,4) ) +transpose(transpose((((((X|X) +transpose(X,-7) ) +X) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) |((transpose(echo(X,4,6) ,4) +transpose(transpose(X,4) ,7) ) +echo(transpose((X+transpose(X,12) ) ,4) ,4,6) ) ) ,-5) ,7) ) ) +transpose(transpose((transpose(step(X,12) ,-7) |arpeggio((transpose((X|X) ,4) +step((transpose(X,4) +X) ,12) ) ) ) ,-7) ,12) ) ) +transpose((arpeggio((transpose((((X|(transpose((X|X) ,-7) +transpose(((X+transpose((transpose(X,-7) +transpose(X,12) ) ,4) ) +transpose((X+transpose((X|X) ,7) ) ,7) ) ,12) ) ) +((transpose(step(X,12) ,-5) +transpose(((X+transpose(X,12) ) +transpose(((X+transpose(X,7) ) +X) ,7) ) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) ) +((transpose(arpeggio(X) ,4) +transpose(transpose(arpeggio(X) ,-5) ,12) ) +transpose(((transpose(X,-5) +transpose(X,-5) ) |(transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ) ,7) ) ) ,4) +transpose((transpose(echo((arpeggio(transpose(X,-5) ) +transpose(shuffle(transpose(X,-5) ) ,12) ) ,4,6) ,4) +transpose((transpose(arpeggio(transpose((transpose(X,-7) |(X+echo(X,4,6) ) ) ,4) ) ,-5) +(transpose(step(X,12) ,4) +transpose((X|X) ,12) ) ) ,7) ) ,7) ) ) |((transpose(arpeggio(transpose(transpose(X,-5) ,-7) ) ,4) +transpose(shuffle(transpose(transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-5) ,-5) ,-5) ) ,7) ) +transpose(arpeggio(((arpeggio(echo(arpeggio(X) ,4,6) ) |((transpose(X,4) +transpose((arpeggio(transpose(X,-5) ) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ,7) ) +(((X+transpose(X,12) ) +transpose(X,7) ) |step(X,12) ) ) ) |transpose((transpose(X,-7) +(transpose(((transpose(X,-7) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4) +arpeggio((X+transpose((X|X) ,7) ) ) ) ) ,-7) ) ) ,7) ) ) ,4) ) +transpose((((shuffle((transpose((X|X) ,-5) +transpose(arpeggio(transpose(transpose(X,-5) ,4) ) ,-5) ) ) +transpose(transpose(transpose(transpose((transpose(X,-7) |step(((X|X) +transpose((arpeggio(X) +(X+X) ) ,7) ) ,12) ) ,4) ,4) ,4) ,4) ) +transpose(step(transpose(echo(step(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-7) ,12) ,4,6) ,4) ,12) ,7) ) +transpose(transpose(((((echo(transpose(transpose(X,4) ,-7) ,4,6) |transpose(((transpose(X,-7) |(X+X) ) +transpose((X|X) ,12) ) ,4) ) +step(transpose(echo(echo(X,4,6) ,4,6) ,4) ,12) ) +transpose(((transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) +((X+X) +transpose(X,-7) ) ) ,4) ) |(arpeggio(transpose((transpose(echo(echo(X,4,6) ,4,6) ,-5) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ,4) ) |arpeggio((transpose(((step(X,12) |(transpose(X,-7) +X) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,4) +transpose(((transpose((step(X,12) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,-5) +transpose(transpose((X|X) ,4) ,4) ) +transpose(shuffle(transpose(transpose((X|X) ,4) ,-7) ) ,7) ) ,7) ) ) ) ) ,-7) ,12) ) ,7) )
random seed used was 17161 EXPR = (transpose(((shuffle(((arpeggio(echo(shuffle(((X|X) +X) ) ,4,6) ) |(arpeggio(transpose(transpose(X,4) ,4) ) |transpose((X|arpeggio(transpose(X,-5) ) ) ,-7) ) ) +((echo(X,4,6) |transpose(X,-7) ) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,12) ) ) ) +transpose(transpose(((arpeggio((transpose(transpose((X|X) ,4) ,-5) |transpose((X+transpose(X,7) ) ,-7) ) ) +transpose(((((transpose(X,4) +transpose(X,4) ) +transpose(((X+transpose(X,7) ) +(X+X) ) ,7) ) +transpose((X|(((X+X) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) +transpose(transpose((transpose(transpose(X,4) ,-7) +step(X,12) ) ,4) ,4) ) ,-7) ,4) ) +transpose((((((echo(((X+transpose(X,7) ) |X) ,4,6) +transpose(((step(X,12) |((X+transpose(X,4) ) +transpose(X,7) ) ) +(X+transpose(X,7) ) ) ,12) ) |transpose(((transpose((X|X) ,-7) +(X+transpose(X,12) ) ) +transpose((X|transpose(X,-7) ) ,12) ) ,-7) ) +transpose(transpose(echo(((X+X) |transpose(step(X,12) ,-7) ) ,4,6) ,-7) ,4) ) +transpose(((transpose(arpeggio(arpeggio((X+X) ) ) ,4) |transpose(X,4) ) +transpose(transpose(((echo(X,4,6) +transpose(X,12) ) |step((X|X) ,12) ) ,-5) ,7) ) ,12) ) +transpose(arpeggio(((arpeggio((transpose(step(X,12) ,-5) +(X|step(X,12) ) ) ) +transpose(step(echo((X+transpose(X,12) ) ,4,6) ,12) ,12) ) +transpose(transpose((X+transpose((X+X) ,12) ) ,4) ,12) ) ) ,7) ) ,7) ) ,4) +(shuffle((transpose((echo(X,4,6) +transpose((X|step(X,12) ) ,7) ) ,4) +transpose(((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((arpeggio(X) |X) ,4) ) ,-7) +transpose(((((X+X) +X) +transpose(arpeggio((((X|X) +transpose(transpose(X,4) ,4) ) +transpose(((X+X) |X) ,7) ) ) ,4) ) +transpose(transpose(arpeggio(transpose((X+X) ,-5) ) ,-7) ,7) ) ,4) ) +transpose(step((transpose(transpose((transpose(X,4) +transpose(transpose(X,-7) ,12) ) ,-5) ,4) +transpose(arpeggio(((X|X) |X) ) ,7) ) ,12) ,7) ) ,7) ) ) +transpose(arpeggio(((X+transpose(step((transpose(X,-5) +transpose(transpose(X,4) ,12) ) ,12) ,4) ) +transpose((X+transpose((transpose(X,4) |(X+transpose(X,12) ) ) ,12) ) ,7) ) ) ,12) ) )
random seed used was 0 EXPR = (echo((transpose(transpose(((arpeggio((X+X) ) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) +transpose(((X|X) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,7) ) ,-5) ,-7) +transpose(transpose(transpose(((shuffle((arpeggio(X) +transpose((echo(X,4,6) +transpose(X,7) ) ,7) ) ) |shuffle((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ) +transpose((((echo(transpose(X,-7) ,4,6) +transpose((echo(X,4,6) +transpose(X,12) ) ,12) ) +transpose(transpose(arpeggio(transpose(X,-7) ) ,-5) ,4) ) +transpose(transpose(((shuffle(X) +transpose(transpose(X,-5) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) ,-7) ,7) ) ,7) ) ,-5) ,4) ,7) ) ,4,6) +((transpose(transpose(arpeggio((transpose((arpeggio(X) |arpeggio(X) ) ,4) +transpose(transpose(transpose(transpose(arpeggio(X) ,-7) ,-7) ,4) ,12) ) ) ,-5) ,-5) +transpose((transpose(((shuffle(X) |echo((X+transpose(X,12) ) ,4,6) ) +step(transpose(arpeggio(((step((X|X) ,12) +transpose(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,-7) ,12) ) ,-5) +transpose(transpose((transpose(arpeggio(shuffle(X) ) ,-5) +arpeggio((X+transpose(X,7) ) ) ) ,-7) ,7) ) ,4) ) +transpose(arpeggio((((step(X,12) +transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ) ,7) ) )
random seed used was 0 EXPR = (((transpose((transpose(shuffle(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ) ,4) +((((X+transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) |transpose(X,4) ) +transpose((transpose(X,4) +transpose((X|X) ,4) ) ,12) ) ) ,-7) |(shuffle(transpose(transpose(X,4) ,-7) ) +transpose(shuffle(transpose((transpose(X,-7) +transpose(X,7) ) ,4) ) ,-7) ) ) +arpeggio((transpose(transpose((X+X) ,-5) ,-5) +transpose(echo((((X+(X|X) ) |transpose(X,-7) ) +transpose(((transpose(X,-5) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4,6) ,7) ) ) ) +transpose(transpose(transpose(echo(((transpose(X,-5) +(transpose(X,-7) +shuffle((X|X) ) ) ) +transpose(((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,4) |(echo(transpose(X,4) ,4,6) +transpose((X|X) ,-5) ) ) +(step(((X+X) |transpose(X,4) ) ,12) +transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ,12) ) ) ,12) ) ,4,6) ,-5) ,-5) ,7) )
random seed used was 0

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