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((((arpeggio((X|transpose(X,4) ) ) +transpose(arpeggio(shuffle(transpose(transpose(X,4) ,-5) ) ) ,7) ) +transpose(transpose(transpose(arpeggio(((transpose((X+transpose(X,-5) ) ,-5) +transpose(((X+transpose(((transpose(X,-7) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(echo((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,7) ) ) ,4) ,-5) ,12) ) +transpose(echo(((((arpeggio(X) +transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) ,12) ) +transpose(echo(transpose(step(X,12) ,4) ,4,6) ,4) ) +transpose(step(arpeggio(X) ,12) ,7) ) +transpose((((shuffle(step(transpose((X+transpose(X,7) ) ,4) ,12) ) +transpose((transpose(((X|X) |X) ,-7) +transpose(step((X|transpose(X,-7) ) ,12) ,12) ) ,4) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(transpose(X,-5) |transpose(X,4) ) ) ,4) ,7) ) +transpose((transpose((X|X) ,4) +transpose(X,12) ) ,12) ) ,12) ) ,4,6) ,12) ) ,-7) ,4) ,12) |((arpeggio(((((transpose(transpose(((((X|X) |X) +step(X,12) ) +transpose(transpose(transpose(transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,-7) ,-5) ,7) ) ,-7) ,4) +transpose((transpose((transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-7) +transpose(transpose((((arpeggio(transpose(X,-7) ) +transpose((X|X) ,-7) ) +transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,4) ,7) ) ,-7) |transpose((((X+X) +transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) ,-5) ) ,4) ) +transpose(echo(((((step(((X+transpose((X|X) ,4) ) +transpose((X|X) ,7) ) ,12) |X) +transpose((((arpeggio((X+X) ) |X) +transpose(shuffle(X) ,7) ) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) ,4) ) +transpose(((echo((transpose(X,4) +transpose(step((X+transpose(X,12) ) ,12) ,12) ) ,4,6) +transpose((step((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) +transpose((transpose(transpose(X,4) ,4) |transpose((X+transpose(X,12) ) ,4) ) ,12) ) ,4) ) +transpose(transpose((arpeggio(X) +(X+transpose(X,12) ) ) ,-5) ,7) ) ,7) ) +transpose(transpose(transpose((transpose(arpeggio(X) ,4) +transpose((X|X) ,-7) ) ,4) ,4) ,7) ) ,4,6) ,7) ) +transpose((echo((step(transpose((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,-7) ,12) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) ,4,6) +transpose(arpeggio(((((((echo(X,4,6) |step(X,12) ) +transpose(arpeggio(X) ,12) ) |step(transpose(transpose(transpose(X,4) ,4) ,-5) ,12) ) +transpose(transpose(((transpose(X,-7) |((X|X) +transpose(X,4) ) ) |transpose(transpose(X,-5) ,4) ) ,4) ,12) ) +transpose(transpose((transpose(step(X,12) ,4) +(transpose((X+transpose(X,7) ) ,-7) +transpose((X+transpose(X,-5) ) ,7) ) ) ,-7) ,4) ) +transpose(transpose(shuffle(shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) ) ) ,4) ,7) ) ) ,12) ) ,4) ) +transpose((transpose((transpose((transpose(((X|X) +transpose(X,12) ) ,-5) |transpose(X,4) ) ,-5) |(((arpeggio(X) |arpeggio(transpose(X,-7) ) ) +transpose(transpose(step(transpose((X|X) ,-7) ,12) ,-7) ,4) ) |transpose((transpose(arpeggio(X) ,4) |X) ,-7) ) ) ,4) |(((step((arpeggio(transpose(X,-5) ) |((transpose(X,-7) +transpose(X,7) ) +transpose(step((X+transpose(X,12) ) ,12) ,12) ) ) ,12) +transpose(transpose((echo(X,4,6) +transpose(echo(arpeggio(X) ,4,6) ,12) ) ,-5) ,7) ) +transpose(((echo((shuffle(transpose(((X|X) +transpose(arpeggio((X|X) ) ,12) ) ,-5) ) |transpose(transpose((transpose(X,-7) |transpose(X,4) ) ,-5) ,4) ) ,4,6) +transpose(((transpose(((transpose(transpose(X,4) ,-5) +transpose(X,7) ) |X) ,4) +transpose(((X+transpose(X,12) ) |(((((X|X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) ,7) ) +transpose(transpose(X,-5) ,4) ) ) ,12) ) +transpose(((transpose((shuffle(arpeggio(X) ) +transpose((X|X) ,7) ) ,-5) +transpose(shuffle(X) ,7) ) +transpose(transpose(transpose(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,-7) ,4) ,7) ) ,12) ) ,4) ) +transpose(transpose(transpose((step(X,12) +transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,-7) ,-7) ,7) ) ,12) ) +transpose((transpose((transpose((X+transpose(shuffle(X) ,12) ) ,-5) +transpose(transpose(X,-7) ,7) ) ,4) |step(arpeggio((echo(X,4,6) |(transpose((X+transpose(X,12) ) ,-7) +transpose(transpose((X+X) ,4) ,12) ) ) ) ,12) ) ,7) ) ) ,7) ) ) |((echo(((((((X+transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) +transpose(arpeggio(transpose((X|echo(X,4,6) ) ,-7) ) ,12) ) +transpose((step(transpose(X,-5) ,12) +transpose(transpose(step(X,12) ,4) ,-7) ) ,4) ) +transpose(step(transpose((X|(X|X) ) ,4) ,12) ,7) ) +transpose(arpeggio(shuffle((shuffle((transpose(X,4) |(X+transpose(X,7) ) ) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,7) ) ,4,6) +transpose((((echo((X+transpose(transpose(X,4) ,12) ) ,4,6) +(transpose(transpose(step((X+transpose(X,7) ) ,12) ,-5) ,-7) +transpose(step((echo((X+transpose(transpose(X,-7) ,7) ) ,4,6) +transpose((X+transpose(X,12) ) ,-7) ) ,12) ,-5) ) ) |transpose(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ) |(((((X+transpose(transpose(echo((echo(X,4,6) +(X|X) ) ,4,6) ,-5) ,12) ) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose(((transpose(echo(X,4,6) ,-5) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) ) ,12) ) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) +(transpose(transpose(X,-5) ,-7) |((step(((X+transpose(X,12) ) +transpose(arpeggio(X) ,7) ) ,12) +transpose((((X|X) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(((X+X) |transpose(X,-5) ) ,7) ) ,4) ) +transpose(echo(transpose(shuffle(X) ,-7) ,4,6) ,7) ) ) ) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +X) +transpose(transpose(X,4) ,4) ) +transpose((step((X+transpose(X,7) ) ,12) +(transpose(X,-5) |transpose(X,-5) ) ) ,7) ) |transpose(shuffle(shuffle(transpose(X,4) ) ) ,4) ) ,12) ) ) ,12) ) |((echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,4,6) +transpose(transpose((arpeggio(shuffle(X) ) |echo(X,4,6) ) ,-5) ,12) ) +transpose((transpose(echo(((transpose(transpose(transpose(transpose(((X|X) +transpose(transpose(X,-5) ,12) ) ,-5) ,-7) ,-5) ,-5) +transpose((transpose((echo(X,4,6) +transpose(((X+X) |X) ,12) ) ,-7) +(transpose((X+transpose(X,12) ) ,4) +transpose(step(shuffle(X) ,12) ,4) ) ) ,4) ) +transpose(((transpose(step(transpose(transpose((X+transpose(X,7) ) ,4) ,4) ,12) ,-5) +transpose((((echo(echo(X,4,6) ,4,6) +transpose(step(arpeggio(arpeggio(echo(X,4,6) ) ) ,12) ,4) ) +transpose(((X|step(X,12) ) +transpose((echo(X,4,6) |transpose(X,4) ) ,12) ) ,7) ) |step(transpose(transpose(transpose(X,4) ,4) ,4) ,12) ) ,4) ) +transpose(shuffle(transpose(shuffle(X) ,-7) ) ,7) ) ,7) ) ,4,6) ,-5) +transpose(transpose(transpose(transpose(transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ,4) ,-7) ,-5) ,4) ,12) ) ,12) ) ) ) +transpose((echo((echo(step(echo(echo(transpose(X,-7) ,4,6) ,4,6) ,12) ,4,6) +transpose(echo(transpose(shuffle((((arpeggio(shuffle(X) ) +transpose(shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,7) ) +transpose((transpose((X+transpose(shuffle(X) ,7) ) ,-7) |transpose((X|X) ,-5) ) ,4) ) +transpose(((echo(X,4,6) +transpose(echo(X,4,6) ,7) ) +transpose(transpose((X|transpose(X,4) ) ,4) ,12) ) ,7) ) ) ,4) ,4,6) ,12) ) ,4,6) +transpose(arpeggio(transpose(((transpose(transpose(((X|(X+transpose(X,7) ) ) |shuffle((X+X) ) ) ,4) ,4) |(transpose(((transpose(transpose(X,4) ,-5) |(((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) ) |X) ,-7) +transpose(transpose((step((X+transpose((X|X) ,12) ) ,12) |(transpose(echo(X,4,6) ,-7) +transpose(echo((X+transpose(transpose(X,4) ,12) ) ,4,6) ,12) ) ) ,4) ,7) ) ) |(step(((transpose(X,-7) +(X|X) ) |(X|X) ) ,12) +transpose(transpose(echo(transpose((transpose(transpose(X,-5) ,4) |transpose(transpose(X,4) ,-5) ) ,4) ,4,6) ,4) ,12) ) ) ,-7) ) ,7) ) ,12) ) ) |echo(transpose(((shuffle(((echo(transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,-7) ,4,6) +transpose(transpose((echo(X,4,6) +(transpose(arpeggio(X) ,-7) +transpose(transpose(X,-5) ,-7) ) ) ,-5) ,12) ) +transpose(shuffle(transpose((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) +transpose((transpose(X,-5) |(X|X) ) ,12) ) ,-7) ) ,12) ) ) +transpose(((transpose(transpose(step((transpose(X,4) |transpose(X,-5) ) ,12) ,-5) ,4) +transpose(((transpose((transpose(X,4) |(X+X) ) ,-7) +transpose(transpose(echo(shuffle(((transpose(X,-5) +transpose(X,7) ) +transpose(((step(X,12) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,12) ) ) ,4,6) ,4) ,4) ) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,7) ) ,4) ) +transpose(transpose(((((step((X+transpose(X,7) ) ,12) |shuffle(transpose(X,-7) ) ) +((X+transpose((X|X) ,4) ) +transpose((X|X) ,7) ) ) +transpose(transpose((((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) |echo((X+X) ,4,6) ) ,-7) ,12) ) +transpose(transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose(((X|X) +transpose(echo(X,4,6) ,12) ) ,7) ) ,4) ,12) ) ,-7) ,7) ) ,4) ) +transpose(((shuffle(transpose(((X+transpose((X+transpose(X,7) ) ,12) ) |((X|X) +step(X,12) ) ) ,-5) ) +transpose(step((arpeggio(echo(echo(X,4,6) ,4,6) ) +transpose(((shuffle(X) +transpose(X,12) ) +transpose((X+shuffle(X) ) ,7) ) ,12) ) ,12) ,7) ) |echo(shuffle(X) ,4,6) ) ,7) ) ,-5) ,4,6) ) +transpose(transpose(((transpose((transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,-7) |((((transpose((((transpose(transpose(X,-7) ,-5) +(transpose(X,4) |transpose(X,4) ) ) +transpose((shuffle(transpose(X,-5) ) |transpose((transpose(X,4) |(X|X) ) ,4) ) ,4) ) +transpose(transpose(transpose(shuffle(X) ,-7) ,-5) ,7) ) ,4) +transpose((shuffle(transpose(((X|X) |(X+transpose(X,7) ) ) ,4) ) |(echo(shuffle((X|X) ) ,4,6) +transpose(arpeggio(X) ,12) ) ) ,4) ) +transpose((X|((transpose(transpose(X,4) ,-7) +transpose((transpose(X,4) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose((X|X) ,7) ) ) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(transpose((arpeggio(echo(transpose(X,-5) ,4,6) ) |transpose(transpose(X,-5) ,4) ) ,4) ,12) ) ,-7) ,4) ) +transpose(transpose(transpose((transpose((shuffle(arpeggio(X) ) |arpeggio((echo(X,4,6) +transpose(X,12) ) ) ) ,4) +transpose(transpose(((X|transpose(X,4) ) |step(((transpose(X,-7) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,-5) ,12) ) ,-5) ,-7) ,7) ) ) ,-5) +transpose((((echo(transpose(((echo(X,4,6) +transpose(transpose(X,-5) ,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((echo(X,4,6) +transpose((X|X) ,7) ) ,7) ) ,-7) ) ,4) ,4,6) |(((echo((shuffle((transpose(X,4) |transpose(X,4) ) ) |shuffle(X) ) ,4,6) +(echo(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) |((transpose(X,4) +transpose(X,12) ) |transpose(X,4) ) ) ) +transpose(((transpose(step(X,12) ,-5) +transpose(transpose((X+transpose(transpose(X,-7) ,12) ) ,4) ,4) ) +transpose(transpose((arpeggio(X) +transpose(X,7) ) ,-7) ,7) ) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,4) ,7) ) ) +transpose(arpeggio(transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ) ,4) ) ,4) ) +transpose((transpose(echo(arpeggio(echo(((X+transpose(X,4) ) +transpose(arpeggio(X) ,12) ) ,4,6) ) ,4,6) ,-5) |(transpose(transpose(X,4) ,-5) +transpose(transpose(shuffle((X+transpose(X,7) ) ) ,-7) ,12) ) ) ,7) ) ,4) ) +transpose(((((((transpose((X+transpose(X,12) ) ,4) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose((((transpose(X,-5) +transpose((X|X) ,4) ) +transpose(X,7) ) |(transpose(X,-5) +transpose(X,7) ) ) ,7) ) +transpose((step(transpose(transpose(X,4) ,4) ,12) +(transpose(transpose(echo(X,4,6) ,4) ,4) |transpose((X+transpose(X,7) ) ,4) ) ) ,7) ) +transpose(step(((((shuffle((X+X) ) +transpose(shuffle(X) ,7) ) +((X+transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ) |((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(echo(X,4,6) ,7) ) +transpose(echo(X,4,6) ,12) ) ) +transpose((((X+transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) +step((X+transpose(X,7) ) ,12) ) ,7) ) ,12) ,4) ) +transpose((((transpose(transpose(X,-5) ,4) |arpeggio(echo(transpose(arpeggio(X) ,-5) ,4,6) ) ) |shuffle(transpose(X,4) ) ) +transpose((arpeggio((X|X) ) +transpose(transpose(echo(X,4,6) ,4) ,-7) ) ,7) ) ,7) ) +transpose((transpose(transpose((shuffle(X) +transpose(transpose(X,-5) ,7) ) ,-5) ,-5) +transpose(transpose(arpeggio(X) ,-5) ,-7) ) ,4) ) ,7) ) ,4) ,7) ) ,4)
random seed used was 219502498

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