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:
shuffle(((((((((((((X|X) +step(X,12) ) +transpose(shuffle(X) ,12) ) |(X+step((X|transpose(X,4) ) ,12) ) ) |transpose(transpose((X+transpose(X,7) ) ,4) ,-5) ) +transpose((((transpose((X+X) ,-7) +X) +(X|step(X,12) ) ) |transpose(transpose(arpeggio((X+X) ) ,-5) ,4) ) ,7) ) +transpose(transpose(step((((transpose((transpose(shuffle(X) ,4) +transpose(transpose(X,-5) ,7) ) ,-7) +step((arpeggio(transpose(X,4) ) +transpose(transpose(X,-7) ,-7) ) ,12) ) +echo(X,4,6) ) +transpose(((transpose(X,-5) +arpeggio(X) ) +step(echo(X,4,6) ,12) ) ,7) ) ,12) ,4) ,7) ) |arpeggio((((shuffle(transpose(((transpose((X+transpose(X,12) ) ,-5) +transpose((X|X) ,12) ) +transpose(shuffle(transpose((X+transpose(X,7) ) ,-5) ) ,7) ) ,-5) ) |transpose((transpose(((X|(((X+X) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose(X,4) ) ,4) +(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,-5) +transpose(X,-7) ) ) ,-5) ) +transpose(((transpose(((((echo(X,4,6) +X) +transpose(X,12) ) |transpose(((X|X) |(X+transpose(X,7) ) ) ,-7) ) |transpose(transpose(X,-7) ,-7) ) ,-7) +transpose((((transpose(X,-7) +transpose(X,12) ) +transpose((transpose(X,-5) +X) ,12) ) +transpose((transpose(echo(X,4,6) ,-7) +((X|X) +X) ) ,-7) ) ,4) ) +transpose(((transpose((X|X) ,4) +step(X,12) ) +transpose(transpose((step((X+transpose(X,12) ) ,12) |(X+X) ) ,-7) ,12) ) ,7) ) ,7) ) +transpose(transpose(arpeggio(step(echo(echo(transpose(transpose(X,4) ,-5) ,4,6) ,4,6) ,12) ) ,-7) ,7) ) ) ) +transpose(arpeggio(((transpose(echo((((transpose(X,-7) +transpose(echo(((transpose(X,-7) +transpose((X+X) ,7) ) +step(transpose(X,-5) ,12) ) ,4,6) ,4) ) +transpose(((transpose(arpeggio(X) ,-5) +transpose(echo((transpose(X,4) +X) ,4,6) ,4) ) +transpose((step((X|X) ,12) +transpose((((X+transpose(shuffle(X) ,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,12) ) +echo(X,4,6) ) ,7) ) ,7) ) ,7) ) ,7) ) +((transpose(((X+X) |X) ,-5) +(X+transpose(transpose((X+shuffle(X) ) ,-5) ,7) ) ) |step(transpose(step((transpose(X,-7) +step(X,12) ) ,12) ,-7) ,12) ) ) ,4,6) ,-5) +transpose(transpose(transpose(transpose(shuffle(step(((shuffle(transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,12) ) ,4) ,4) ,-5) ,7) ) |transpose(((((((((step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,12) +transpose(((shuffle(X) +(((X|X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) |transpose(transpose(X,4) ,-7) ) ,4) ) +transpose(((X|X) |transpose((X+transpose(transpose(X,4) ,12) ) ,-7) ) ,7) ) +transpose((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ,12) ) +transpose(transpose(echo(((X+transpose(X,12) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,4,6) ,4) ,7) ) +transpose(arpeggio(echo((((((transpose(X,4) +step(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) +transpose(step((X+X) ,12) ,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,4,6) ) ,7) ) |echo((transpose(arpeggio((transpose(X,4) +transpose(X,-5) ) ) ,-7) |echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) ) ,4,6) ) +transpose(echo((arpeggio(transpose(X,4) ) +(transpose(X,-7) |transpose((X+transpose(X,7) ) ,4) ) ) ,4,6) ,12) ) +transpose((((echo((X+transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) ,4,6) +transpose((step(transpose(X,4) ,12) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ,12) ) +transpose(transpose(transpose((transpose(X,4) +transpose(transpose(X,-7) ,12) ) ,-7) ,4) ,7) ) +transpose(shuffle(echo(transpose(transpose(((transpose(X,-5) |(X+transpose(X,7) ) ) +transpose(X,12) ) ,4) ,4) ,4,6) ) ,4) ) ,7) ) ,4) ) ) ,12) ) |shuffle(((transpose(step((transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((transpose(transpose((X+X) ,-5) ,-5) +transpose(((X+echo(X,4,6) ) |X) ,7) ) ,4) ) +transpose(transpose(echo(shuffle(X) ,4,6) ,-5) ,7) ) +transpose(transpose(transpose(transpose(shuffle(X) ,-5) ,-7) ,-5) ,4) ) +transpose(transpose(((X+transpose(X,7) ) +(X|X) ) ,-5) ,7) ) +transpose((((transpose((transpose(X,-5) |X) ,-7) +echo((((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) +transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(X,7) ) ,4,6) ) +transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,4) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ,7) ) ,12) ) ,4) |(transpose((transpose((((X|X) +transpose(((X+X) +X) ,12) ) +transpose((shuffle(X) |(X+transpose(X,7) ) ) ,7) ) ,-5) +transpose(((shuffle((X|X) ) |(arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) +transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,7) ) ,4) +transpose(transpose((transpose(transpose(X,4) ,-5) +(shuffle((X+transpose(X,7) ) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,7) ) ) ,-5) ,12) ) ) ,12) ,-5) +transpose((transpose(transpose(echo(transpose(transpose((transpose(echo(X,4,6) ,4) +transpose(X,12) ) ,-5) ,-7) ,4,6) ,4) ,4) +transpose((transpose((arpeggio(transpose(X,4) ) +transpose(transpose(transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,4) ,-7) ) ,4) +transpose(transpose((echo(((echo(arpeggio(transpose(X,-7) ) ,4,6) +transpose((transpose(X,-7) +(X+(X+transpose(X,12) ) ) ) ,4) ) +transpose((transpose(step((transpose(X,-5) |transpose(X,-5) ) ,12) ,4) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ,7) ) ,4,6) +transpose(transpose(transpose(echo(echo(echo((X|X) ,4,6) ,4,6) ,4,6) ,4) ,-5) ,7) ) ,4) ,7) ) ,12) ) ,12) ) +transpose(transpose(transpose((transpose(step(transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) ,12) ,-7) +transpose(((shuffle(echo(arpeggio(X) ,4,6) ) +transpose(transpose((((((transpose(X,-5) |X) +transpose((X+transpose(transpose(X,-7) ,7) ) ,7) ) +transpose(shuffle((transpose(X,-5) |step(X,12) ) ) ,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) +transpose(arpeggio(transpose(echo(X,4,6) ,-7) ) ,12) ) ,4) ,7) ) +transpose(transpose((((transpose(X,4) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) +(X+transpose((X|X) ,7) ) ) +transpose(step(transpose(echo(X,4,6) ,-5) ,12) ,7) ) ,-5) ,7) ) ,7) ) ,4) ,4) ,12) ) ) ) +transpose((transpose(((((((X|(((shuffle(X) +transpose(transpose(transpose(shuffle(X) ,-7) ,-5) ,12) ) +transpose(transpose((((X|X) +transpose((transpose(X,-7) +transpose((X+X) ,7) ) ,4) ) +transpose((transpose(X,4) +(X+X) ) ,7) ) ,-7) ,4) ) +transpose((shuffle(X) +transpose(echo(arpeggio((X+X) ) ,4,6) ,7) ) ,7) ) ) +transpose(transpose(((((((X+X) +transpose(X,12) ) |(X+transpose(X,12) ) ) |transpose((X+transpose(X,12) ) ,4) ) |(((arpeggio(X) +transpose(arpeggio(X) ,12) ) +transpose((((X|X) +transpose(arpeggio(X) ,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose((transpose(X,4) +transpose(shuffle(X) ,7) ) ,7) ) ) +transpose((shuffle((X+X) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,12) ) ,4) ,4) ) +transpose((((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,7) ) ) ,-7) +arpeggio(transpose((X|X) ,-7) ) ) +transpose(transpose((echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) |transpose(step(X,12) ,-7) ) ,-7) ,12) ) +(((transpose(transpose(X,-5) ,4) +transpose(arpeggio(X) ,12) ) |(((X+transpose(X,12) ) +transpose(echo(X,4,6) ,12) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) ) +transpose((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) ) ,7) ) +transpose(((arpeggio((X+transpose(X,7) ) ) +transpose(echo((echo(X,4,6) +(X+transpose(X,12) ) ) ,4,6) ,12) ) +transpose(((arpeggio(transpose(shuffle(X) ,-7) ) +transpose(transpose(((transpose(step(X,12) ,4) +transpose((X+X) ,4) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ,-7) ,4) ) +transpose((((X|X) |X) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) ,7) ) ,12) ) ,4) ) |transpose(shuffle((((transpose((X+transpose(X,7) ) ,4) |((X+transpose(X,12) ) +transpose(X,-5) ) ) +(echo(arpeggio(step(X,12) ) ,4,6) +transpose(((echo(X,4,6) +transpose(X,12) ) |(transpose(X,-5) +transpose(transpose(X,4) ,7) ) ) ,12) ) ) +shuffle((transpose(arpeggio((X|X) ) ,-7) |(step(X,12) +transpose((X+transpose(transpose(X,4) ,12) ) ,12) ) ) ) ) ) ,-7) ) +transpose(transpose((((X+X) +transpose((X|(X+transpose(X,7) ) ) ,7) ) +transpose((arpeggio(X) +X) ,7) ) ,-5) ,-7) ) ,4) |echo(transpose(shuffle(((echo(((X+step(X,12) ) |(transpose(X,-5) |(X+transpose(X,12) ) ) ) ,4,6) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((transpose((X|X) ,4) +transpose(step(shuffle(X) ,12) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,7) ) ) ,-7) ,4,6) ) ,4) ) +transpose(shuffle((transpose(arpeggio((((((transpose((((X+X) +X) +transpose(transpose(shuffle(X) ,-5) ,12) ) ,4) +transpose(step(transpose(((transpose(X,-7) +transpose((X+(X|X) ) ,4) ) +transpose(shuffle((X+X) ) ,7) ) ,-5) ,12) ,7) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ,4) ) +transpose(transpose((transpose(X,-7) +arpeggio(X) ) ,-5) ,7) ) |((transpose(((step(echo(X,4,6) ,12) +transpose((X+transpose(X,12) ) ,7) ) +echo((transpose(echo(X,4,6) ,-5) |(X+transpose(X,12) ) ) ,4,6) ) ,-5) +transpose(transpose((transpose(X,4) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,4) ,4) ) +transpose(((transpose(shuffle(((arpeggio(X) +transpose(X,4) ) +transpose((X+X) ,7) ) ) ,4) +transpose(((transpose((X+transpose(X,12) ) ,4) +transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) ) +transpose((transpose(transpose(X,4) ,-5) +transpose((transpose(X,4) |(step(X,12) +(((X|X) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ) ) ,12) ) ,7) ) ,7) ) ) +step(step((((arpeggio((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) +((X|X) +transpose((X+transpose(X,7) ) ,7) ) ) ) +transpose(((shuffle(X) |transpose(X,-5) ) |transpose(transpose((X|X) ,-5) ,-5) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) +transpose(echo((((transpose((X+X) ,-7) +transpose(arpeggio(X) ,12) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) +transpose(transpose((X|X) ,4) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ,7) ) +arpeggio(transpose(X,-5) ) ) ,4,6) ,12) ) ,12) ,12) ) ) ,4) +transpose(((transpose(((((X+transpose(X,7) ) +(X+X) ) +(transpose((X+X) ,4) +transpose(transpose((X+transpose(transpose(X,-7) ,12) ) ,-7) ,7) ) ) |(transpose((X|X) ,-7) |(step(shuffle(X) ,12) +echo(X,4,6) ) ) ) ,-5) +(((((((transpose(X,-5) +transpose(step(X,12) ,7) ) +transpose(X,4) ) +transpose((step((X+transpose(X,7) ) ,12) +transpose(X,7) ) ,12) ) +transpose((transpose(transpose(X,-7) ,-5) +transpose((((X+X) +transpose(X,12) ) +arpeggio(transpose(X,-5) ) ) ,12) ) ,7) ) +transpose(echo(echo(((transpose((arpeggio(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) +X) +shuffle(X) ) ,4,6) ,4,6) ,12) ) +(((((transpose((transpose(X,-7) +(X|X) ) ,4) |(transpose(echo(X,4,6) ,4) +transpose((transpose(X,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ) |step(((X+transpose(X,7) ) +transpose(X,12) ) ,12) ) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose(step(arpeggio(transpose(X,-5) ) ,12) ,7) ) +((transpose(X,-5) |(X+transpose((arpeggio(X) +transpose(((X+transpose(X,12) ) +(X+X) ) ,12) ) ,12) ) ) +transpose((arpeggio((X+transpose(X,7) ) ) |transpose(transpose(X,4) ,-5) ) ,7) ) ) ) |echo((echo(transpose(echo(transpose(X,4) ,4,6) ,-7) ,4,6) +transpose(((transpose(X,4) +transpose(echo(X,4,6) ,12) ) +transpose((X|X) ,7) ) ,7) ) ,4,6) ) ) |step(((((arpeggio(transpose(((X|X) +(X+transpose(X,7) ) ) ,-5) ) +(((transpose(X,-5) +transpose(echo(X,4,6) ,12) ) +transpose((X+transpose(echo(X,4,6) ,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(((transpose((X+transpose(X,12) ) ,-7) +transpose(step(transpose(X,-7) ,12) ,12) ) +transpose(((echo(X,4,6) +(X+echo(X,4,6) ) ) +transpose(transpose((((X|X) +transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,7) ) ,12) ) ,12) ) +transpose(shuffle(echo(step(((X+transpose(X,12) ) +(transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) |shuffle(X) ) ) ,12) ,4,6) ) ,12) ) |arpeggio(step((X+X) ,12) ) ) ,12) ) ,4) ) ) ,7) ) )
random seed used was 229433483

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