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((step(transpose(transpose(((step(echo(transpose((((X+X) +transpose(echo(X,4,6) ,7) ) |((X+X) +transpose(step(X,12) ,12) ) ) ,-5) ,4,6) ,12) +transpose((echo((arpeggio(X) |(X|X) ) ,4,6) +(((transpose((X+transpose(transpose(X,-5) ,12) ) ,4) +transpose(step(echo((((X|X) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,12) ,12) ) +transpose((transpose((X+transpose(X,7) ) ,-7) +transpose((transpose(X,4) |(X+transpose(X,12) ) ) ,7) ) ,7) ) +((transpose(transpose(arpeggio(shuffle(X) ) ,-5) ,-5) +transpose(((((X+transpose((X+X) ,12) ) +(transpose(X,4) |transpose(arpeggio(X) ,-5) ) ) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(transpose(((X|X) |step(X,12) ) ,-7) ,7) ) ,4) ) +transpose(transpose(step((X+transpose(X,12) ) ,12) ,-7) ,7) ) ) ) ,4) ) +transpose((((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ) +transpose(shuffle(shuffle(shuffle(X) ) ) ,12) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) +(((transpose(X,-7) |(step(X,12) +transpose(X,-5) ) ) |arpeggio(X) ) |((X+X) +(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ) ) ,7) ) ,4) ,-5) ,12) +transpose((((echo(transpose((transpose((((((transpose(transpose((X+transpose(X,7) ) ,-7) ,4) +transpose(step(step((X+X) ,12) ,12) ,-5) ) +transpose(step(step(transpose(X,-7) ,12) ,12) ,7) ) +(((X+transpose(X,4) ) +transpose(arpeggio(X) ,12) ) +step(arpeggio((X+transpose(X,12) ) ) ,12) ) ) +transpose(((((X+transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,7) ) +(((step(X,12) |transpose(X,4) ) +transpose(((transpose(X,4) |(X+X) ) |((X|(X+X) ) +transpose((transpose(X,4) +transpose(X,-5) ) ,7) ) ) ,4) ) +transpose((transpose(X,-7) +transpose((echo(X,4,6) +X) ,12) ) ,7) ) ) ,4) ) +transpose(transpose((((((transpose(X,-5) +step(X,12) ) +transpose(X,12) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose((step(X,12) +echo(X,4,6) ) ,-7) ,4) ) +transpose((transpose(((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) +transpose(step(transpose(X,-5) ,12) ,12) ) ,7) ) ,4) ,7) ) ,-5) +step(transpose(transpose((transpose((shuffle((X|X) ) +arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,12) ) ) ) ) ,-7) +(shuffle((X+transpose(X,-5) ) ) |arpeggio(transpose(X,-7) ) ) ) ,-7) ,-7) ,12) ) ,-5) ,4,6) +transpose((((((transpose(transpose(arpeggio(arpeggio((step(X,12) |X) ) ) ,4) ,4) |step(transpose(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ,-5) ,12) ) +transpose((echo((transpose((echo(((X|X) +transpose(X,12) ) ,4,6) +transpose(((transpose(X,-5) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,4) +step(transpose(echo(echo(((transpose((transpose(X,4) +transpose(X,-7) ) ,4) +transpose(arpeggio((X+X) ) ,4) ) +transpose(X,7) ) ,4,6) ,4,6) ,-5) ,12) ) ,4,6) +transpose((transpose((arpeggio(transpose(transpose(shuffle(transpose((X+X) ,4) ) ,-7) ,-7) ) |(((echo(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ,4,6) +transpose(transpose((X+transpose((X|(X|X) ) ,12) ) ,-5) ,4) ) +transpose((transpose(shuffle(step(shuffle(X) ,12) ) ,4) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) +shuffle(echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) ) ) ,7) ) ,4) ) +transpose(shuffle(((echo(transpose(step(transpose(X,4) ,12) ,4) ,4,6) +((transpose((X+X) ,-5) +transpose(transpose((X+X) ,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ) |transpose((transpose(shuffle((X|X) ) ,-5) +transpose(transpose((shuffle(X) +transpose(X,12) ) ,4) ,7) ) ,4) ) ) ,7) ) ) ,-5) |transpose((arpeggio(((arpeggio(transpose((transpose(arpeggio(X) ,-7) +(X|echo(X,4,6) ) ) ,4) ) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose((transpose(((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,4) ) +transpose(X,7) ) ,-7) |(transpose(transpose(transpose(X,4) ,4) ,-7) +transpose(((X+(X+X) ) +transpose(X,12) ) ,7) ) ) ,7) ) ) +transpose((((arpeggio((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |arpeggio(X) ) |((X+transpose(arpeggio((X|X) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(transpose((((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,-5) ,7) ) ) +(((echo(shuffle(X) ,4,6) |((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(shuffle(X) ,4) ) +transpose((((arpeggio(X) +transpose(transpose(X,4) ,12) ) +transpose(arpeggio(echo((X|X) ,4,6) ) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,7) ) ) +transpose(transpose((transpose(transpose(((X|X) |X) ,4) ,4) +transpose(arpeggio(step(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,12) ) ,7) ) ,4) ,4) ) +transpose(transpose(transpose(((X+transpose(transpose(X,4) ,-7) ) |(step(X,12) +transpose(transpose((X|transpose((X+X) ,-7) ) ,-7) ,12) ) ) ,-7) ,-5) ,7) ) ,7) ) ,4) ) ,7) ) ,12) ) +transpose(shuffle(shuffle((transpose(transpose((transpose(step(X,12) ,4) +transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) ,-7) ,-5) +transpose((step(transpose(X,-5) ,12) |transpose(((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) +transpose(step(X,12) ,7) ) ,-5) ) ,12) ) ) ) ,4) ) +transpose(transpose(((transpose(shuffle(transpose(transpose((transpose(X,4) +transpose(step((echo(transpose(X,4) ,4,6) |transpose(transpose(X,-7) ,4) ) ,12) ,12) ) ,-7) ,4) ) ,-5) |transpose(echo((shuffle(X) |transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) ) ,4,6) ,-5) ) +(((transpose((((((X|X) +transpose(echo(X,4,6) ,12) ) +transpose((((transpose(X,-7) +transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(((X+X) +X) ,7) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(step(X,12) ,12) ) ) ,7) ) |(transpose(X,-5) +transpose(transpose(step(X,12) ,-7) ,12) ) ) ,-7) |transpose(transpose((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ) ,4) ,4) ) +transpose((((((shuffle(transpose(transpose(X,4) ,-5) ) +(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) +transpose((transpose((X+X) ,4) +transpose((transpose(X,-5) |(arpeggio(X) +transpose(step(X,12) ,12) ) ) ,7) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) +transpose(echo((((transpose(X,-7) |transpose(X,-7) ) +transpose((((X+transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ,7) ) |transpose(step((shuffle(transpose(X,4) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,-5) ) ,4) ) +transpose(transpose(echo(transpose(transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +(X|X) ) |transpose(X,-5) ) ,-5) ,-5) ,4,6) ,4) ,7) ) ) ,-5) ,7) ) +transpose((arpeggio((arpeggio(transpose(arpeggio(echo(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) ) ,4,6) ) ,4) ) |transpose(((transpose((((step(X,12) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ) ,4) +transpose(transpose(((transpose(X,-5) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) +((arpeggio((X+transpose(X,12) ) ) +transpose(shuffle(((X+transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) ) ,4) ) +transpose(X,7) ) ) ,-7) ,7) ) +shuffle((((transpose(shuffle(X) ,-5) +transpose(((X+X) +X) ,4) ) +transpose((((X+X) +arpeggio(X) ) +transpose(X,-7) ) ,7) ) |(transpose(((X|X) +X) ,4) |arpeggio((transpose((X+X) ,4) |(X+arpeggio(X) ) ) ) ) ) ) ) ,4) ) ) |((transpose((step((arpeggio(echo(transpose(transpose(X,-7) ,-5) ,4,6) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,12) +echo((((((X+transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) +transpose(transpose(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,-7) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+shuffle(X) ) ,7) ) +transpose(transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) ,-5) ,7) ) ,7) ) ,4,6) ) ,-7) +transpose(transpose(transpose(((transpose(((transpose(X,4) |arpeggio(X) ) +X) ,-7) +transpose((transpose(transpose(transpose(X,-5) ,-5) ,-5) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ,7) ) ,4) ) +transpose(transpose(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,7) ) +transpose(((X+transpose(echo(X,4,6) ,12) ) +(X+transpose(X,12) ) ) ,12) ) ,4) ,7) ) ,4) ,4) ,7) ) |echo((transpose(transpose(((echo(X,4,6) |(transpose(X,4) |X) ) |(X+((X+transpose(X,12) ) |transpose(X,-7) ) ) ) ,-5) ,-7) +transpose(transpose(transpose((echo(X,4,6) +transpose(((X|X) |(((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,12) ) ,-5) ,-7) ,12) ) ,4,6) ) ) ,7) ) ,4) ) +transpose(((transpose((((echo(((arpeggio(transpose(X,4) ) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(((X+transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ,4,6) +transpose(((((transpose(X,-5) |transpose(X,-7) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) +transpose((X+(arpeggio(X) +transpose((X+X) ,7) ) ) ,-7) ) |transpose((X+X) ,4) ) ,12) ) +transpose(((((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(shuffle(arpeggio((transpose(X,-5) +(X+transpose(X,12) ) ) ) ) ,7) ) ,12) ) +transpose((echo(step(transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ,-7) ,12) ,4,6) +transpose(((transpose((transpose(X,4) +transpose(X,7) ) ,-5) +transpose(((transpose(echo((X|transpose(X,-5) ) ,4,6) ,4) +transpose(((X+X) +(X|X) ) ,12) ) +transpose(((((X+X) +(X+transpose(X,12) ) ) |(arpeggio(X) +transpose(X,7) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(shuffle((((echo(transpose(shuffle(X) ,4) ,4,6) +transpose(X,-5) ) +((((X|X) |X) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ) +(((X+transpose(transpose(X,4) ,12) ) |transpose(transpose(X,4) ,-7) ) |transpose(transpose(X,-7) ,-7) ) ) ) ,7) ) ,7) ) ,12) ) ,4) |(transpose(echo(X,4,6) ,-5) |(((X+echo(X,4,6) ) +transpose(transpose(((X+X) |X) ,-5) ,12) ) +transpose(transpose(arpeggio(transpose(X,4) ) ,-7) ,12) ) ) ) |arpeggio((transpose(shuffle(echo(((((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) ,4,6) ) ,-5) +transpose(transpose((echo(echo(X,4,6) ,4,6) |transpose(transpose(X,-7) ,-7) ) ,4) ,-7) ) ) ) ,7) ) +transpose(transpose(arpeggio(transpose(((step((echo(X,4,6) +transpose(transpose((transpose(transpose(X,4) ,-5) +transpose((transpose(step((X|X) ,12) ,4) +transpose(X,-5) ) ,7) ) ,-5) ,12) ) ,12) |shuffle((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(transpose(arpeggio(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,-5) ,12) ) ) ) +transpose(((echo((transpose(X,-7) |transpose(X,-5) ) ,4,6) |transpose(transpose(arpeggio(step(((X+X) +transpose(step(X,12) ,-5) ) ,12) ) ,-7) ,4) ) +transpose(shuffle((transpose(X,-7) +(shuffle(X) |X) ) ) ,7) ) ,7) ) ,-7) ) ,-7) ,4) ) ,7) ) ,-7)
random seed used was 236137173

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