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

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