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:
(((((transpose(((shuffle(transpose(arpeggio((step(transpose(((X+transpose(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,12) +transpose(X,12) ) ) ,-7) ) +transpose(transpose(((transpose((X+transpose(X,7) ) ,-7) +transpose((step(X,12) +transpose(X,12) ) ,-7) ) +transpose(transpose(arpeggio(transpose((transpose(X,-5) +transpose((X+transpose(X,-5) ) ,7) ) ,-5) ) ,4) ,7) ) ,-7) ,4) ) +transpose(transpose(echo(((transpose(transpose((transpose(arpeggio(X) ,-7) |(shuffle(X) +transpose(X,12) ) ) ,4) ,-7) +transpose(transpose(transpose((((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) +transpose(X,4) ) +transpose((transpose(X,-7) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,7) ) ,-7) ,-7) ,4) ) +transpose(transpose(transpose(transpose(transpose(X,-7) ,-5) ,-7) ,-7) ,7) ) ,4,6) ,-5) ,7) ) ,-5) +transpose(transpose(arpeggio((transpose(echo(echo((transpose((((shuffle(X) +transpose((X+transpose(transpose(shuffle(X) ,-7) ,-7) ) ,4) ) +transpose(transpose((X+echo(transpose(X,4) ,4,6) ) ,4) ,7) ) +transpose(echo(((transpose((transpose(X,-5) |shuffle(X) ) ,-5) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ,7) ) ,-5) +transpose(step(arpeggio(step(transpose(((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ,12) ,7) ) ,4,6) ,4,6) ,-7) +transpose(step((shuffle(((X+transpose(X,7) ) |(shuffle(arpeggio(transpose(transpose(X,-7) ,-7) ) ) +transpose((transpose(((X+transpose(X,7) ) +transpose((X|(X+transpose(X,12) ) ) ,7) ) ,-5) +transpose(((transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4) +transpose(((echo(X,4,6) +transpose(X,12) ) +((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) ) +transpose((echo((X+echo(X,4,6) ) ,4,6) +transpose(((transpose(step(X,12) ,-5) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,12) ) ,12) ) ) ) +arpeggio(transpose((transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(shuffle(shuffle(step((X+transpose(X,12) ) ,12) ) ) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) ,4) +transpose((echo(transpose((shuffle(X) |((echo(X,4,6) +transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,-7) ,4,6) +transpose((echo(transpose(arpeggio(X) ,-7) ,4,6) +transpose((X+transpose(X,-5) ) ,7) ) ,7) ) ,12) ) ,-7) ) ) ,12) ,12) ) ) ,-7) ,4) ) +transpose(step((transpose(step(step((arpeggio(shuffle(transpose(step(X,12) ,-5) ) ) +step(transpose(echo(X,4,6) ,-7) ,12) ) ,12) ,12) ,-7) |echo(transpose(transpose(((transpose(transpose(((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ,4) +transpose(echo(step(shuffle(X) ,12) ,4,6) ,7) ) +transpose(transpose((transpose(X,-5) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ,-5) ,7) ) ,-5) ,-5) ,4,6) ) ,12) ,7) ) +transpose(arpeggio(transpose((transpose(step(transpose(((transpose(transpose(((X|X) |X) ,4) ,-7) +transpose((X+transpose(shuffle(X) ,7) ) ,12) ) +transpose((transpose(transpose((X+transpose(X,12) ) ,-5) ,4) +transpose(echo(transpose(transpose(X,-5) ,-7) ,4,6) ,12) ) ,7) ) ,4) ,12) ,-7) +((step(transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ,12) +transpose((X+transpose((shuffle((arpeggio(X) +transpose((step(X,12) +transpose(X,12) ) ,7) ) ) |transpose(step(X,12) ,-5) ) ,12) ) ,12) ) +transpose((((shuffle((shuffle((X+X) ) +transpose(transpose(echo((echo(X,4,6) |shuffle(echo(transpose(X,-7) ,4,6) ) ) ,4,6) ,-5) ,12) ) ) +transpose((step(((((X+X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) +transpose((transpose(X,-7) +transpose((transpose(X,4) |(X+transpose(X,7) ) ) ,12) ) ,4) ) +transpose(((echo(echo(X,4,6) ,4,6) +transpose((X+transpose(arpeggio(X) ,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,12) +transpose(transpose(((transpose(transpose(X,4) ,-5) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) +(((X+transpose(X,7) ) +((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,12) ) ) ,-7) ,12) ) ,4) ) +transpose(arpeggio(transpose((step(transpose(X,-7) ,12) +transpose(transpose(X,-5) ,7) ) ,-5) ) ,7) ) +((((step(arpeggio((step(X,12) +transpose(transpose(X,-7) ,-7) ) ) ,12) +transpose(transpose(transpose(step(X,12) ,-5) ,-5) ,4) ) +transpose(transpose((step(transpose(X,-5) ,12) |transpose(transpose(echo(X,4,6) ,-7) ,-7) ) ,-5) ,7) ) +step(transpose(shuffle((X+transpose(transpose((X|X) ,-5) ,12) ) ) ,-7) ,12) ) |(((((transpose(echo(X,4,6) ,-7) |(echo(X,4,6) +(X+transpose(X,12) ) ) ) +transpose(transpose(((transpose(X,-5) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,-7) ,4) ) +transpose(step(arpeggio(transpose(arpeggio(X) ,-5) ) ,12) ,7) ) +transpose(arpeggio((shuffle(echo(X,4,6) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,12) ) +transpose(transpose(transpose(arpeggio(X) ,-7) ,-5) ,12) ) ) ) ,12) ) ) ,-5) ) ,12) ) +((transpose(shuffle(shuffle((step(echo(step(step(transpose(shuffle((transpose(echo((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,-7) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) ) ,-5) ,12) ,12) ,4,6) ,12) +transpose((transpose(((((transpose(shuffle(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,-7) ) ,-7) |((transpose(X,4) +transpose(transpose(X,4) ,12) ) +transpose(shuffle((((transpose(X,-7) |X) +transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,4) ,-7) ,7) ) ) ,7) ) ) +transpose((transpose(transpose(((transpose((X|X) ,-7) +transpose(((shuffle((X+transpose(X,7) ) ) +transpose((X|(X+transpose(X,12) ) ) ,4) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,4) ) +transpose((transpose(X,-7) |arpeggio(transpose(X,-7) ) ) ,7) ) ,-7) ,-7) +((transpose((X|X) ,-5) +transpose(shuffle(echo(transpose(X,-7) ,4,6) ) ,4) ) +transpose(echo((transpose(X,-5) +transpose(transpose((X|X) ,-7) ,12) ) ,4,6) ,7) ) ) ,4) ) +transpose((step(transpose(((transpose(X,-7) |echo(X,4,6) ) +(step(X,12) +transpose(X,-7) ) ) ,-7) ,12) +transpose(transpose(shuffle(step(X,12) ) ,-7) ,7) ) ,7) ) +transpose(transpose(transpose(step(echo(X,4,6) ,12) ,-5) ,-5) ,7) ) ,4) +transpose((((transpose(transpose(((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose(transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,-7) ,7) ) ,-5) ,-5) +transpose(step(((arpeggio(((transpose((((X+X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,-7) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(((transpose(((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ,-5) +transpose(transpose((X+X) ,-7) ,7) ) +shuffle(step(transpose(X,-7) ,12) ) ) ,12) ) +((transpose((transpose(X,4) |arpeggio(transpose(X,-7) ) ) ,-7) +transpose(transpose(transpose(transpose(shuffle(X) ,-7) ,-5) ,-7) ,7) ) +transpose(step(arpeggio(X) ,12) ,12) ) ) ,12) ,12) ) +transpose(((((transpose(transpose(arpeggio(X) ,-5) ,-5) +transpose(transpose(X,4) ,7) ) +step(((X|X) +transpose(transpose(X,-5) ,12) ) ,12) ) +transpose((transpose(((echo(step((transpose(X,-5) +transpose(arpeggio(X) ,7) ) ,12) ,4,6) +transpose(step(transpose(X,-5) ,12) ,7) ) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,-5) +transpose(arpeggio((((shuffle(X) |transpose(X,-5) ) |(shuffle(X) +transpose(X,12) ) ) +transpose(shuffle(X) ,7) ) ) ,12) ) ,4) ) +transpose(((shuffle(step((X+transpose(X,12) ) ,12) ) +transpose((transpose(transpose(echo(X,4,6) ,-5) ,-7) +transpose(shuffle(arpeggio(transpose((X+transpose(X,7) ) ,-7) ) ) ,7) ) ,4) ) +transpose(shuffle(transpose(step(X,12) ,-7) ) ,7) ) ,7) ) ,4) ) +transpose(arpeggio(((transpose((arpeggio(X) |X) ,-5) |(shuffle(step(X,12) ) +transpose(arpeggio(X) ,7) ) ) |transpose(((transpose(arpeggio(X) ,-5) +transpose(((X+step(X,12) ) +transpose(X,12) ) ,4) ) +transpose(transpose(transpose((X+X) ,-7) ,4) ,7) ) ,-7) ) ) ,7) ) ,12) ) ,12) ) ) ) ,-7) +transpose(echo((shuffle(transpose((shuffle(arpeggio(step((((((X+transpose(X,12) ) +transpose((X+transpose(transpose(X,-7) ,12) ) ,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) +transpose(shuffle((X|X) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,12) ) ) +transpose(arpeggio((transpose((X+transpose(X,7) ) ,-7) +transpose(transpose(step(X,12) ,-5) ,7) ) ) ,7) ) ,-7) ) |transpose((shuffle(transpose(((((X+transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) +X) +transpose(step(shuffle(X) ,12) ,12) ) ,-7) ) +(transpose(shuffle((((transpose(X,-5) |shuffle(X) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,4) ) +transpose(shuffle(X) ,7) ) ) ,-5) |transpose(step(arpeggio(transpose((X+transpose(X,7) ) ,-5) ) ,12) ,-5) ) ) ,4) ) ,4,6) ,4) ) +transpose(transpose(transpose(transpose((echo(arpeggio((step(echo(((transpose(X,-5) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) ,4,6) ,12) +transpose(echo(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) ,4,6) ,12) ) ) ,4,6) |step(arpeggio(step(shuffle(transpose((X+transpose(X,12) ) ,-7) ) ,12) ) ,12) ) ,4) ,-5) ,-7) ,7) ) ) +transpose(shuffle(echo(transpose(((((transpose(echo(X,4,6) ,-5) +step(transpose((transpose(X,4) |(X+X) ) ,-5) ,12) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,-5) ) +transpose(((transpose(transpose(transpose(((step((X+transpose(X,7) ) ,12) +transpose(transpose(X,-5) ,4) ) +transpose(echo(transpose(transpose(X,-5) ,-5) ,4,6) ,7) ) ,-7) ,-7) ,-7) |((transpose((transpose(step(transpose(X,-7) ,12) ,-7) +transpose(step((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ,7) ) ,-5) +transpose(((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) |transpose(transpose(X,-7) ,-5) ) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,7) ) ) +transpose(((transpose(transpose(((echo(((X+transpose(X,12) ) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,12) ) ,4,6) |(arpeggio(((X+transpose(X,7) ) |echo(X,4,6) ) ) +(((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(step((X|X) ,12) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ) ) |echo(transpose(echo((X+X) ,4,6) ,4) ,4,6) ) ,-5) ,-5) +transpose(transpose(transpose((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) |arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) +transpose(((transpose(transpose(X,-5) ,-7) +transpose(((step(X,12) +transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) ,12) ) +transpose(((X|arpeggio(transpose(X,-7) ) ) +shuffle(arpeggio(X) ) ) ,7) ) ,7) ) ,-5) ,-7) ,4) ) +transpose(arpeggio(shuffle((shuffle(X) |transpose(transpose(transpose(X,4) ,-7) ,-5) ) ) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(arpeggio(step(transpose(transpose((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ,-7) ,-5) ,12) ) ,-5) ,7) ) ,-7) ,4,6) ) ,12) )
random seed used was 124540689

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