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:
(echo(((transpose(((((step(transpose((X+X) ,-5) ,12) |transpose(transpose((X|X) ,-5) ,-7) ) |((transpose(X,-5) +((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +(X|transpose(X,-7) ) ) ) +step(shuffle(X) ,12) ) ) +transpose(transpose(transpose(arpeggio(shuffle(X) ) ,-5) ,4) ,7) ) |transpose((((transpose(((transpose(X,-7) +((transpose(X,-5) |X) +transpose((X+transpose(X,12) ) ,12) ) ) |(transpose((X+transpose(X,12) ) ,-7) +transpose(arpeggio(X) ,12) ) ) ,4) +transpose((transpose((X+transpose(X,12) ) ,-7) |(((transpose(X,4) +transpose(transpose(echo(X,4,6) ,4) ,12) ) +transpose(arpeggio((shuffle(step(X,12) ) +((X+X) |X) ) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,-7) ) +transpose(((((transpose(transpose((X+X) ,-7) ,4) +transpose(((X|(X+transpose((X+transpose(X,12) ) ,12) ) ) +(step(X,12) +transpose(X,7) ) ) ,4) ) +transpose(arpeggio(shuffle((X|(X+X) ) ) ) ,7) ) +transpose(transpose((arpeggio(X) +transpose((step(X,12) +transpose(X,4) ) ,7) ) ,4) ,7) ) |(transpose((transpose((X+transpose(X,7) ) ,-5) +echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,4) +(transpose((X+transpose(transpose(X,-7) ,7) ) ,-5) +transpose(X,4) ) ) ) ,4) ) +transpose((((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) ,-5) |(((X+transpose(X,-7) ) |step(transpose(X,-7) ,12) ) |step((X+X) ,12) ) ) |(((transpose(((X+X) +transpose(transpose(X,-5) ,12) ) ,-7) +transpose(transpose(X,4) ,-5) ) +transpose((((X|X) +(X+transpose(X,12) ) ) +transpose(arpeggio(X) ,7) ) ,7) ) +(X+transpose(X,7) ) ) ) |echo((((shuffle(echo(X,4,6) ) +((((X+transpose(X,7) ) +transpose((X|X) ,12) ) +transpose((X|(X+transpose(X,7) ) ) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(step(X,12) ,7) ) ,7) ) ) +transpose(transpose((X|X) ,-5) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,4,6) ) ,7) ) ,4) ) ,4) +transpose((transpose(((arpeggio(transpose(shuffle(step(X,12) ) ,-5) ) |echo(shuffle(X) ,4,6) ) |echo(((((X+(X+X) ) |X) +transpose(echo(echo(shuffle(X) ,4,6) ,4,6) ,7) ) |((((X+transpose((X|X) ,7) ) |(transpose(X,-7) +transpose(X,12) ) ) +transpose(echo(((X+X) +transpose(transpose(X,4) ,12) ) ,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,4,6) ) ,-7) |shuffle((shuffle((((((shuffle(X) +X) |transpose(X,4) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((((X|X) +transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose((step(X,12) +(X|(X+X) ) ) ,7) ) ) +((echo(transpose(transpose(X,-5) ,-5) ,4,6) |transpose((X+transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(((((step(X,12) +transpose(X,4) ) +transpose((X+X) ,7) ) +transpose(step(transpose(shuffle(X) ,-7) ,12) ,4) ) +transpose(transpose(step(((X+transpose(transpose(X,-7) ,7) ) |X) ,12) ,-5) ,7) ) ,7) ) ) ) ) ,12) ) |transpose(((transpose((((transpose(transpose(X,4) ,4) +transpose(((transpose((X|X) ,-5) +arpeggio(X) ) +transpose(((transpose(transpose(X,-5) ,-5) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4) ) ,7) ) +transpose(((shuffle(transpose((X+X) ,4) ) |((arpeggio(transpose(X,-7) ) +transpose(X,4) ) +transpose(((((X+transpose(X,12) ) |X) |X) +transpose(transpose((X+X) ,-7) ,12) ) ,7) ) ) +transpose(transpose((transpose((X|echo(X,4,6) ) ,-5) +step(transpose(X,4) ,12) ) ,-5) ,-5) ) ,4) ) +transpose(transpose((((X+X) +X) +shuffle((transpose(transpose(X,-7) ,-5) +transpose(transpose(X,4) ,7) ) ) ) ,4) ,7) ) ,-7) +transpose(transpose(transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ,4) ) +transpose(((transpose(transpose(X,-5) ,-5) +transpose((transpose(X,-5) +transpose((X|X) ,7) ) ,4) ) +transpose(transpose(((X+X) |transpose(X,4) ) ,4) ,7) ) ,7) ) ,4) ,4) ,12) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |((X+transpose((transpose(echo(X,4,6) ,-5) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) ,-5) ) ,-5) ) ,4,6) |(echo(((shuffle(((step(step((shuffle(echo(((((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) +transpose(X,7) ) ,4,6) ) |(transpose(transpose((X+transpose(transpose(X,-7) ,12) ) ,4) ,-5) +X) ) ,12) ,12) +transpose(transpose(transpose((shuffle(X) +((transpose(X,-7) +transpose(X,7) ) |(X+X) ) ) ,-7) ,-5) ,7) ) +(step(echo(echo((transpose(X,4) +transpose(arpeggio(transpose((X+transpose(X,12) ) ,-7) ) ,7) ) ,4,6) ,4,6) ,12) +transpose((((transpose(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio((X|X) ) ,4) ) ,4) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose((((arpeggio((X+transpose(X,7) ) ) |X) +transpose(transpose(X,-5) ,4) ) +transpose((echo(X,4,6) +transpose(X,7) ) ,7) ) ,7) ) ,7) ) +transpose((((transpose(transpose((X+X) ,4) ,-5) |transpose(X,-5) ) |(shuffle((X+X) ) +(((X+transpose(X,12) ) |(X+X) ) +((transpose(X,-5) +transpose(((X+X) +arpeggio(X) ) ,4) ) +transpose(X,7) ) ) ) ) |((shuffle((X+X) ) +transpose(echo(X,4,6) ,7) ) +arpeggio(((X|X) +transpose(transpose(X,-5) ,7) ) ) ) ) ,12) ) +transpose(transpose(arpeggio(shuffle(transpose(X,4) ) ) ,-5) ,-7) ) ,12) ) ) ) +transpose(arpeggio((((transpose(((((((X+transpose(X,7) ) +((X|X) |X) ) +transpose((X+transpose(step(X,12) ,12) ) ,4) ) +transpose(transpose((X+shuffle(X) ) ,-5) ,7) ) +shuffle((X|(X+transpose(X,7) ) ) ) ) +transpose(transpose(echo(step((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ,4,6) ,-5) ,12) ) ,4) +transpose(((transpose(transpose(((echo((X|X) ,4,6) +transpose(shuffle(((echo(X,4,6) +transpose((((X+X) +transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,-5) ,4) +transpose(((step((transpose(transpose(X,-7) ,4) +transpose((X+transpose(X,12) ) ,-5) ) ,12) |(transpose(transpose(X,-5) ,-5) +transpose(arpeggio(transpose(X,4) ) ,7) ) ) +transpose((((arpeggio(((X+transpose(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(step((X|X) ,12) ,7) ) ) |((((X|X) +X) +transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ) +transpose(transpose((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) |transpose(((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ,-7) ) ,12) ) ,4) ) +transpose((shuffle(step(echo(transpose(X,4) ,4,6) ,12) ) +step(transpose(X,-7) ,12) ) ,7) ) ,4) ) +transpose((arpeggio((((((X+transpose(X,7) ) +transpose((transpose(X,-7) +transpose(X,4) ) ,4) ) +transpose((transpose(X,-5) |(step(X,12) +(X+transpose(X,12) ) ) ) ,7) ) +(transpose(X,4) +transpose(X,-5) ) ) |transpose(step((echo(transpose(X,-5) ,4,6) +transpose(shuffle((X|X) ) ,7) ) ,12) ,4) ) ) +transpose(transpose((arpeggio(transpose(arpeggio((((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) |X) ) ,4) ) |((((X|X) +transpose(echo((X+X) ,4,6) ,4) ) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,7) ) +(((X+transpose(X,12) ) +transpose(X,12) ) +X) ) ) ,4) ,7) ) ,7) ) |((transpose(transpose((((transpose(arpeggio((X+(X+transpose(X,12) ) ) ) ,4) +(X|((transpose((X+transpose(transpose(X,-5) ,12) ) ,4) +transpose(((X+X) +transpose(X,12) ) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) ) ) +transpose(transpose(((X+X) +X) ,4) ,12) ) +transpose((X|transpose(X,4) ) ,-5) ) ,-7) ,-5) +transpose(transpose(step((transpose(X,4) +X) ,12) ,4) ,4) ) +transpose(transpose(transpose((((shuffle((transpose(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4) |(X+transpose(transpose(X,-5) ,12) ) ) ) +transpose(transpose(((X+X) +echo(X,4,6) ) ,-7) ,-5) ) +transpose((((arpeggio(X) +(echo(X,4,6) +transpose(X,4) ) ) +transpose(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,12) ) +(arpeggio(X) +transpose(step(X,12) ,7) ) ) ,12) ) +transpose((((arpeggio(X) |transpose(arpeggio(X) ,-7) ) +transpose(transpose((((X+X) +transpose(X,7) ) +transpose((X+X) ,-7) ) ,4) ,12) ) |(shuffle(transpose(X,4) ) |(shuffle(X) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose((arpeggio(X) +transpose(X,12) ) ,4) ) +transpose((X+transpose(X,4) ) ,7) ) ,7) ) ) ) ,-5) ) ,4) ,-7) ,7) ) ) ) ,4) ) +transpose((echo(shuffle(transpose(transpose(shuffle(X) ,4) ,-7) ) ,4,6) +transpose((echo((transpose(((echo(transpose(X,-5) ,4,6) +shuffle(((X+transpose(arpeggio(X) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) +step(((X|X) +echo(echo(X,4,6) ,4,6) ) ,12) ) ,-5) +transpose(transpose(((transpose(arpeggio(X) ,-5) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) |shuffle((X+transpose(X,12) ) ) ) ,4) ) +transpose(transpose((shuffle(X) +transpose(X,7) ) ,-7) ,7) ) ,-7) ,12) ) ,4,6) |transpose(transpose(((transpose(arpeggio(arpeggio((X+X) ) ) ,-7) |(((X+transpose(X,12) ) +transpose(step(X,12) ,12) ) +transpose((step(arpeggio(X) ,12) +transpose(step(X,12) ,-5) ) ,7) ) ) |transpose((transpose(X,-7) +echo(step(X,12) ,4,6) ) ,-7) ) ,4) ,-7) ) ,-7) ) ,7) ) ,4,6) +transpose(arpeggio((transpose(transpose((transpose(transpose(transpose(X,-5) ,4) ,-5) +transpose(shuffle(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(X,4) ) +transpose(((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ,7) ) ) ,7) ) ,-7) ,4) +(shuffle((((((X+transpose(X,7) ) +transpose((transpose(echo(X,4,6) ,-5) +transpose(transpose(X,4) ,12) ) ,12) ) +transpose(((X|transpose((X+transpose(X,7) ) ,4) ) +transpose((X|(((X+transpose(X,12) ) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) ) ,12) ) ,12) ) +transpose(transpose(((X+transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(arpeggio((X+X) ) ,4) ,7) ) ,-7) ,4) ) +transpose(transpose(((step((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,12) +transpose(transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose((((X|transpose(X,-7) ) +transpose(transpose((X+X) ,-7) ,12) ) |(step((X+X) ,12) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ) ,7) ) ,-5) ,7) ) ) |step(transpose(((transpose((transpose((X|X) ,4) +transpose(transpose(X,-5) ,4) ) ,-5) +transpose((transpose(X,4) |transpose(shuffle(X) ,4) ) ,4) ) +transpose(((((shuffle(X) +transpose(X,12) ) +transpose(transpose((X|X) ,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(((echo(X,4,6) +transpose(arpeggio(X) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,7) ) ,7) ) ,-5) ,12) ) ) ) ,-5) ) )
random seed used was 155704533

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