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 18 generations the expression "X" became this:
((arpeggio(((transpose((transpose(((((transpose(arpeggio(transpose(X,-5) ) ,4) +arpeggio(arpeggio(transpose(transpose(transpose(X,4) ,-7) ,-5) ) ) ) +transpose(echo(echo(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-5) ,4,6) ,4,6) ,4) ) +transpose(transpose(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4,6) ,4) ,7) ) |((((transpose(step(X,12) ,-5) |transpose(transpose(X,4) ,-5) ) +transpose(((shuffle(echo((X|(X+X) ) ,4,6) ) +transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(((X+X) |echo(X,4,6) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(transpose(echo(X,4,6) ,-7) ,4,6) ,7) ) ,12) ) +transpose((echo(echo(((step((X+X) ,12) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) ) +transpose(X,7) ) ,4,6) ,4,6) +(step((shuffle(X) |(X+X) ) ,12) +((transpose((X|X) ,4) |transpose(X,-7) ) |(X+transpose((X|X) ,12) ) ) ) ) ,4) ) +transpose((((((step((X|X) ,12) +transpose(X,7) ) +(shuffle(X) |(X+X) ) ) +transpose(((transpose(X,-5) +transpose(X,4) ) +((X|transpose(X,-7) ) +transpose((X+X) ,12) ) ) ,12) ) +transpose(echo(shuffle(transpose(transpose(X,4) ,4) ) ,4,6) ,12) ) +((transpose(shuffle((X+X) ) ,4) +transpose(transpose(step(transpose((X|X) ,-7) ,12) ,-7) ,7) ) +transpose((arpeggio((X|X) ) +((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ) ) ,7) ) ) ,4) +transpose((transpose(arpeggio(transpose(((X|(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ) |(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) +transpose(X,7) ) ) ,-5) ) ,4) +transpose(transpose(echo((transpose(transpose(X,-5) ,-5) |(transpose(echo((X+transpose(X,12) ) ,4,6) ,4) |((X|((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) |transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) ) ) ,4,6) ,4) ,7) ) ,7) ) ,4) |transpose(transpose(shuffle((shuffle(shuffle((X+transpose(X,7) ) ) ) |echo(echo(transpose(X,4) ,4,6) ,4,6) ) ) ,-7) ,-7) ) +transpose(shuffle((step(transpose(transpose((arpeggio(transpose(((X|X) +(X+transpose(X,7) ) ) ,-7) ) +transpose((transpose(echo(((X|X) |X) ,4,6) ,-7) +transpose((X+transpose(((X+transpose(X,12) ) |X) ,12) ) ,7) ) ,12) ) ,4) ,4) ,12) +transpose(transpose((transpose(((transpose(transpose((transpose(X,-5) |X) ,4) ,-5) +transpose(X,4) ) +transpose((((transpose((X|(X+X) ) ,4) +echo(X,4,6) ) +transpose(echo(((X+transpose((echo(X,4,6) |X) ,12) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,12) ) ,4,6) ,4) ) +transpose(echo((((X+transpose(transpose((X+X) ,-5) ,4) ) +transpose(((X+X) +X) ,7) ) +transpose(shuffle(shuffle((X|X) ) ) ,7) ) ,4,6) ,7) ) ,7) ) ,4) +(transpose(step(step(transpose(X,-5) ,12) ,12) ,-7) |(shuffle(((X+transpose(X,7) ) +X) ) +arpeggio(transpose(X,-5) ) ) ) ) ,-5) ,12) ) ) ,12) ) ) +transpose(((step(((shuffle((X+transpose(X,7) ) ) |(arpeggio(X) +transpose(((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +step(transpose(X,-5) ,12) ) ,12) ) ) |shuffle((transpose(X,-7) +(transpose(transpose(transpose(step(X,12) ,-7) ,4) ,-7) +((((X+transpose(X,7) ) +transpose(X,-5) ) +transpose(shuffle(transpose(X,4) ) ,12) ) |transpose(shuffle(X) ,4) ) ) ) ) ) ,12) +transpose(((transpose((shuffle((((((X|X) +transpose(X,7) ) +transpose(transpose(X,4) ,-5) ) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ) +transpose((((transpose((X+X) ,4) +transpose(((X+transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(arpeggio(echo(transpose(X,-7) ,4,6) ) ,7) ) +transpose(((((X|X) +X) +transpose((arpeggio(X) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,7) ) ,12) ) ,4) +transpose((arpeggio((arpeggio(transpose((X|echo(X,4,6) ) ,-5) ) +transpose(transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) ) +transpose((transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose((((transpose(echo(X,4,6) ,4) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) ,12) ) ,7) ) ,-7) ) |transpose((((((transpose(X,-5) +transpose(((X+X) |(X|X) ) ,7) ) |(X+X) ) +step(transpose((step(arpeggio(X) ,12) +transpose(X,12) ) ,-7) ,12) ) +transpose((X+transpose(step((shuffle(X) |echo(X,4,6) ) ,12) ,-5) ) ,12) ) +transpose((((echo((transpose(transpose(X,-5) ,4) |arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +echo(X,4,6) ) ,-7) +echo(shuffle((X+transpose(transpose(X,-7) ,12) ) ) ,4,6) ) ,4) ) +transpose(shuffle((transpose(transpose(X,4) ,-5) |transpose(X,4) ) ) ,7) ) +transpose((transpose(arpeggio(X) ,-5) +transpose(transpose(X,4) ,4) ) ,12) ) ,12) ) ,-5) ) ,4) ) +transpose((transpose(transpose(((((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(echo(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,12) ) ,4,6) ,12) ) |echo((transpose((X|X) ,-7) +(X+transpose(X,7) ) ) ,4,6) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |transpose((X+transpose(X,4) ) ,4) ) ,12) ) ,-7) ,-5) +transpose(shuffle(shuffle(shuffle((transpose((transpose(X,-5) +transpose(echo(X,4,6) ,-5) ) ,4) +(transpose(transpose(X,-5) ,-7) +(echo(X,4,6) |(X|X) ) ) ) ) ) ) ,12) ) ,4) ) ,4) ) +transpose(step(transpose(((transpose(echo(transpose(((step(((X|(X|X) ) +arpeggio(echo((X+X) ,4,6) ) ) ,12) |transpose((X+shuffle((X+X) ) ) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,12) ) ,-7) ,4,6) ,-5) +transpose(transpose(((transpose(transpose(transpose(X,4) ,-5) ,-5) +transpose(transpose(shuffle(X) ,-7) ,4) ) |transpose((transpose(echo((X|X) ,4,6) ,4) |transpose(((transpose(X,4) +step(X,12) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,-5) ) ,-7) ) ,-5) ,7) ) +transpose(transpose((arpeggio(((transpose(echo(((((X+transpose(X,7) ) +transpose((X|X) ,7) ) +(X|X) ) +echo((X+transpose(X,12) ) ,4,6) ) ,4,6) ,4) |step(step(transpose((X+transpose(X,12) ) ,-5) ,12) ,12) ) |shuffle(shuffle((X+transpose(X,7) ) ) ) ) ) +transpose((arpeggio((transpose((((transpose(X,-5) |transpose(X,4) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) +transpose((step(X,12) +transpose(echo(X,4,6) ,7) ) ,-7) ) ,4) +transpose((((X+X) +(X|X) ) |transpose(X,-5) ) ,7) ) ) +transpose(step(((step((X|X) ,12) +transpose((transpose(transpose(X,4) ,-5) |X) ,7) ) +((X+echo(X,4,6) ) +(transpose(X,4) +transpose(((X|X) |transpose(X,4) ) ,7) ) ) ) ,12) ,12) ) ,12) ) ,4) ,12) ) ,-7) ,12) ,7) )
random seed used was 211 EXPR = echo((step((((transpose((transpose(((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) +(transpose(transpose((X+X) ,-7) ,-7) +transpose((X|X) ,4) ) ) ,-7) |(transpose(echo(transpose((shuffle(X) +transpose(transpose(X,4) ,12) ) ,-7) ,4,6) ,4) +transpose(echo((transpose(X,-7) |X) ,4,6) ,7) ) ) +transpose(transpose(transpose(((transpose((shuffle(X) |X) ,-5) +transpose(X,12) ) +transpose((echo(transpose(X,4) ,4,6) |(transpose(X,4) +arpeggio((X|X) ) ) ) ,12) ) ,4) ,-7) ,7) ) |step(step((transpose(step((step(X,12) +step(X,12) ) ,12) ,-7) |transpose(((X+X) +transpose((X+transpose(shuffle(X) ,7) ) ,12) ) ,-7) ) ,12) ,12) ) ,12) +transpose((arpeggio(transpose(transpose(((transpose(step(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ,12) ,-7) +transpose(((echo((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(((X+X) |step(X,12) ) ,7) ) ,4,6) +transpose(transpose(X,-7) ,7) ) +transpose((shuffle((transpose(X,-7) +transpose(X,-5) ) ) +transpose(((transpose(X,-7) |transpose(X,-7) ) |((X+transpose(X,7) ) |X) ) ,12) ) ,12) ) ,4) ) +transpose(transpose((((shuffle(X) +transpose(((((shuffle((X+transpose(X,7) ) ) +shuffle(transpose(X,-5) ) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) ,4) ) +transpose(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) +transpose(((transpose(step(X,12) ,-7) +transpose(arpeggio(X) ,-5) ) +transpose(echo(X,4,6) ,-5) ) ,12) ) ,7) ) +transpose((transpose(((((X+X) +X) +(transpose(X,-5) +transpose(X,12) ) ) |(echo(shuffle(X) ,4,6) |X) ) ,4) +transpose(arpeggio(transpose(X,4) ) ,7) ) ,4) ) +transpose(arpeggio((X|(transpose(X,4) +(((X+transpose(echo(X,4,6) ,7) ) +transpose(((X|X) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ) ) ,7) ) ,-5) ,7) ) ,-5) ,4) ) +transpose(transpose(arpeggio((transpose(transpose(transpose((arpeggio((X|echo(X,4,6) ) ) +transpose(X,4) ) ,-7) ,-5) ,-7) +step((shuffle(step((echo(step(X,12) ,4,6) +transpose(((transpose(X,-7) +(X|X) ) +transpose((X|X) ,7) ) ,7) ) ,12) ) +transpose(transpose(transpose((transpose(transpose(X,-7) ,-7) +X) ,-5) ,-7) ,12) ) ,12) ) ) ,-7) ,12) ) ,7) ) ,4,6)
random seed used was 0

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