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((shuffle((shuffle(((transpose(step((transpose(step((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) +step(X,12) ) ,12) ,4) |transpose(transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-5) ,-7) ,-5) ) ,12) ,-7) +transpose((arpeggio((((transpose((X+X) ,-5) +(X|shuffle(X) ) ) +((((transpose(X,-7) +transpose((X|X) ,4) ) +transpose((X|X) ,7) ) |arpeggio(X) ) +(transpose(X,-7) +transpose(step(X,12) ,7) ) ) ) +transpose(((echo(((X+transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) ,4,6) |shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ) |transpose(((arpeggio(X) +transpose((X+transpose((X|X) ,7) ) ,12) ) +transpose(transpose(((X+transpose((X+X) ,7) ) +transpose(transpose((X+X) ,4) ,12) ) ,-7) ,7) ) ,-5) ) ,12) ) ) +transpose(((transpose(transpose(transpose(transpose(((shuffle(X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,4) ,-5) ,-5) +(shuffle(arpeggio(transpose(echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) ,-5) ) ) +(shuffle(((step(X,12) +transpose(X,-5) ) +X) ) +transpose(((arpeggio((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) +transpose((step(step(X,12) ,12) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,4) ) +transpose(transpose(transpose(transpose(X,4) ,4) ,4) ,7) ) ,7) ) ) ) +shuffle((transpose((transpose(step((X+X) ,12) ,4) +shuffle(arpeggio(X) ) ) ,-5) +transpose(transpose(((X+transpose(X,12) ) +step(transpose(shuffle(X) ,4) ,12) ) ,4) ,7) ) ) ) ,12) ) ,12) ) +transpose((transpose(step(transpose((((transpose((transpose(X,-5) +(transpose(X,-5) +(X|X) ) ) ,4) +transpose(transpose(step(arpeggio((X+transpose(X,12) ) ) ,12) ,-5) ,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ,12) ) |step((transpose(X,-7) |echo(X,4,6) ) ,12) ) ,4) ,12) ,4) +transpose(transpose((transpose((transpose(transpose(echo(X,4,6) ,4) ,-5) +transpose(transpose(transpose(transpose(X,4) ,-5) ,4) ,7) ) ,-5) |(transpose((transpose(transpose(arpeggio(transpose(X,-7) ) ,4) ,4) +transpose(shuffle((((transpose(X,-5) +transpose(X,12) ) +transpose(((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4) ) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,12) ) ,-5) +shuffle(transpose(transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(transpose(X,4) ,12) ,7) ) ,12) ,4) ,-7) ) ) ) ,-7) ,7) ) ,7) ) ) |((transpose(((transpose(transpose(transpose(step(((arpeggio(X) +transpose(arpeggio((X+X) ) ,4) ) +transpose(((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose((X|X) ,7) ) ,7) ) ,12) ,-5) ,4) ,-5) |step(step(transpose(step((X+transpose(X,7) ) ,12) ,-5) ,12) ,12) ) +transpose(shuffle((shuffle(shuffle((echo(transpose(arpeggio((X|X) ) ,-5) ,4,6) |((arpeggio((transpose(X,4) +transpose(transpose(X,-7) ,4) ) ) +transpose(transpose((echo(X,4,6) |(X+transpose(X,12) ) ) ,4) ,12) ) +transpose(shuffle((transpose(echo(X,4,6) ,-7) +transpose(((X+transpose(X,7) ) |transpose(X,-5) ) ,7) ) ) ,12) ) ) ) ) +transpose(step((transpose((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) ,-5) +transpose((((X+X) |((transpose(arpeggio(X) ,-7) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose(shuffle((X|X) ) ,7) ) ) |shuffle((echo(X,4,6) |echo(echo(X,4,6) ,4,6) ) ) ) ,12) ) ,12) ,-7) ) ) ,-7) ) ,-5) |transpose(((((transpose((((X+transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(((X|X) +shuffle(X) ) ,12) ) ,4) +transpose(((transpose(shuffle(transpose(transpose(X,-5) ,-5) ) ,4) +transpose((transpose(step(transpose(transpose(X,4) ,-7) ,12) ,-7) +((((X+transpose(X,12) ) +transpose(X,-5) ) +transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose(step((X+X) ,12) ,7) ) ) ,7) ) +(step(transpose(X,-5) ,12) +transpose(transpose(((((X+X) +transpose((transpose(X,-5) |(X+transpose(X,12) ) ) ,7) ) +transpose((step(X,12) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose((((echo(X,4,6) |X) +((X+transpose(X,7) ) +transpose((X+X) ,7) ) ) +transpose((transpose(transpose(X,4) ,4) +transpose((X|X) ,7) ) ,7) ) ,7) ) ,-7) ,12) ) ) ,4) ) +transpose(shuffle(transpose(shuffle((X|(X+transpose(X,12) ) ) ) ,4) ) ,7) ) +transpose(echo(arpeggio(((arpeggio(X) |X) +((X|X) +(arpeggio(X) |X) ) ) ) ,4,6) ,12) ) +transpose(transpose((step(((echo(step((X+(X+X) ) ,12) ,4,6) +transpose(shuffle(transpose(transpose(transpose(X,4) ,-7) ,4) ) ,4) ) +transpose(((shuffle((X+transpose(X,12) ) ) +transpose(X,12) ) |((transpose(X,-5) +transpose(X,12) ) +step(X,12) ) ) ,7) ) ,12) |((echo((transpose(transpose(X,-7) ,-5) +transpose(transpose(((transpose(X,-5) +transpose(X,7) ) +X) ,4) ,12) ) ,4,6) +transpose(((echo(transpose(X,-5) ,4,6) +transpose(transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,4) ,4) ) +transpose((X|shuffle(transpose(X,4) ) ) ,7) ) ,4) ) +transpose(((transpose(X,-5) +(transpose(X,-7) +transpose(X,12) ) ) +(X+transpose(transpose(X,-7) ,7) ) ) ,7) ) ) ,4) ,7) ) ,-5) ) +transpose(transpose(((transpose(transpose(((((X+X) |(((X+transpose(X,4) ) +transpose(X,7) ) |step(X,12) ) ) +transpose(transpose(X,-7) ,4) ) +transpose(((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) +transpose(X,4) ) +transpose((transpose(X,-5) +X) ,7) ) ,7) ) ,4) ,-7) +transpose(transpose(transpose((transpose((((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) ,4) |transpose((X+transpose(X,7) ) ,-5) ) ,-5) ,-7) ,4) ) +transpose((((step(X,12) |(transpose((X+transpose(X,12) ) ,-7) +transpose(transpose(arpeggio(X) ,4) ,7) ) ) |step(X,12) ) +((transpose((X+transpose(X,12) ) ,-5) +((X+transpose(X,4) ) +transpose((X+X) ,7) ) ) |(((X+X) |arpeggio(X) ) +echo(transpose(X,4) ,4,6) ) ) ) ,7) ) ,-7) ,12) ) ) ) +(transpose(echo(transpose(((transpose(transpose((arpeggio(X) +transpose(transpose(X,-5) ,12) ) ,4) ,4) +(shuffle(((arpeggio(X) +transpose((X+X) ,12) ) +transpose(transpose(step(X,12) ,4) ,12) ) ) |(transpose(arpeggio((transpose(X,-5) +transpose(echo(X,4,6) ,12) ) ) ,-5) +transpose((echo((X+X) ,4,6) +transpose(echo((X+X) ,4,6) ,12) ) ,12) ) ) ) +transpose((transpose(transpose(transpose(transpose(step(transpose((X|X) ,-5) ,12) ,-5) ,-5) ,-7) ,-7) +transpose(((echo(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,4,6) |((transpose(X,-7) +transpose((X+X) ,4) ) +transpose(X,7) ) ) +transpose(((transpose((X+X) ,-5) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +(X+transpose(X,7) ) ) ) |(((X|X) +transpose(X,7) ) +transpose(arpeggio(X) ,4) ) ) ,12) ) ,7) ) ,12) ) ,-5) ,4,6) ,-7) +transpose((((arpeggio(step((echo(shuffle((shuffle(transpose((X+transpose(transpose(X,-5) ,7) ) ,4) ) +transpose((((X+transpose(transpose((X|X) ,4) ,12) ) +transpose(((((transpose(X,4) +X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(step((transpose(X,-7) +(X+X) ) ,12) ,12) ) ,4) ) +transpose((transpose(transpose(X,4) ,-5) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) ,7) ) ,12) ) ) ,4,6) +transpose(transpose(transpose(transpose(((shuffle((X+X) ) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) ,-7) ,4) ,-7) ,12) ) ,12) ) +transpose((transpose(transpose((transpose((((step(step(X,12) ,12) +(transpose(X,-5) +transpose(transpose(X,4) ,7) ) ) |arpeggio(X) ) +transpose((transpose(X,-5) +transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((transpose(X,-5) +transpose(X,-5) ) ,-7) ) ,7) ) ,7) ) ,4) |arpeggio(transpose(((X+X) +transpose((X+transpose(X,12) ) ,-5) ) ,4) ) ) ,-5) ,4) +(transpose(shuffle(((((echo(step(step(step(X,12) ,12) ,12) ,4,6) |transpose((transpose(transpose((X+X) ,4) ,-7) +(X+transpose(((echo(X,4,6) |transpose(transpose(X,-7) ,-5) ) +transpose(X,-7) ) ,7) ) ) ,-7) ) +(((transpose((X+transpose(X,12) ) ,-7) +(X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) +echo((arpeggio(X) +(X|(X|X) ) ) ,4,6) ) |(echo(echo(X,4,6) ,4,6) |((transpose(arpeggio(shuffle(X) ) ,4) +transpose(transpose((step((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) +transpose(transpose(X,-5) ,-5) ) ,4) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ) ) ) |transpose(shuffle(shuffle(((((step(X,12) +transpose(step(X,12) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) +transpose(arpeggio((transpose(transpose(X,4) ,-7) +(X|X) ) ) ,4) ) +transpose(transpose((X|X) ,-5) ,7) ) ) ) ,-5) ) +echo(((X+echo(step((X|echo(X,4,6) ) ,12) ,4,6) ) +transpose(((transpose((X+X) ,4) +arpeggio((arpeggio(X) +step((X|X) ,12) ) ) ) |transpose((arpeggio(X) |X) ,4) ) ,12) ) ,4,6) ) ) ,-5) |((step(arpeggio(step(transpose(step(arpeggio(shuffle(transpose(((X+X) |X) ,4) ) ) ,12) ,-5) ,12) ) ,12) |(((transpose(X,4) |(transpose((echo(echo(X,4,6) ,4,6) +X) ,-7) +transpose(transpose(X,4) ,4) ) ) +transpose(shuffle(echo(transpose(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,-7) ,4,6) ) ,12) ) +(transpose((((arpeggio(transpose((X|X) ,-5) ) +((X+transpose(X,12) ) +transpose(X,4) ) ) +transpose(((shuffle(transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-7) ,4) ) +transpose(((step(X,12) |(X+X) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,7) ) |echo(((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) +X) ,4,6) ) ,-7) |(((((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,4) ) +transpose((shuffle(X) +transpose(X,12) ) ,7) ) +transpose((transpose(X,4) +transpose(X,-5) ) ,-5) ) +(transpose((transpose(echo(transpose(X,-7) ,4,6) ,-7) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,7) ) ,-5) +shuffle(X) ) ) |(transpose(transpose(arpeggio(transpose(X,4) ) ,-5) ,-7) |(((X+transpose(step(transpose(transpose(X,4) ,-5) ,12) ,12) ) +(step((X|X) ,12) +transpose((echo(transpose(echo(X,4,6) ,4) ,4,6) |((transpose(X,4) +transpose((transpose(X,-5) +transpose(X,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ) |(transpose(((transpose(transpose(X,4) ,-5) |(X|X) ) +transpose(((X|X) |X) ,12) ) ,4) +echo(transpose(transpose(X,-7) ,-7) ,4,6) ) ) ) ) ) ) ) +(transpose(transpose(transpose((transpose(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ,4) |transpose(((((X|(X|X) ) +transpose(transpose((X+X) ,4) ,4) ) +transpose(X,7) ) |((transpose(arpeggio(X) ,-7) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,-5) ) ,-5) ,4) ,-5) +transpose((arpeggio(echo((X+transpose(X,7) ) ,4,6) ) |(((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) +transpose(((((transpose((X+transpose(X,12) ) ,4) +(X|X) ) +transpose((transpose(X,-7) |(X|X) ) ,4) ) +transpose(transpose((step(X,12) +echo(X,4,6) ) ,-7) ,7) ) +(shuffle(X) |transpose(X,4) ) ) ,12) ) +transpose(transpose(((X|X) +transpose((X|X) ,7) ) ,4) ,-7) ) ) ,4) ) ) ) ) ,4) ) +transpose(((transpose(shuffle(arpeggio((((transpose((X+transpose(X,7) ) ,4) |transpose(step(X,12) ,-7) ) +transpose(shuffle(X) ,-7) ) |transpose((transpose(echo((X+X) ,4,6) ,-7) +transpose(transpose(arpeggio((X+X) ) ,-7) ,7) ) ,4) ) ) ) ,4) +transpose(arpeggio(shuffle(transpose(transpose(((((transpose(transpose((X|X) ,-5) ,-5) |transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,-7) ) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) |((transpose(transpose(X,-7) ,-5) +transpose((transpose(X,4) +transpose(X,7) ) ,12) ) +transpose(shuffle(transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) ,12) ) ) ,-5) ,-5) ) ) ,12) ) |transpose((transpose(transpose((echo(arpeggio(((((transpose(X,-5) |(transpose(X,4) |(X|X) ) ) +step(transpose((X+X) ,-7) ,12) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,4) ) +transpose((X|X) ,7) ) ) ,4,6) +transpose((transpose(((X+X) +transpose(X,7) ) ,-5) |echo(echo(arpeggio(arpeggio(X) ) ,4,6) ,4,6) ) ,7) ) ,-7) ,-5) +transpose(step(echo(((transpose((transpose((shuffle(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) +transpose(X,7) ) ,-7) +transpose(transpose(((X+transpose(transpose(X,-7) ,7) ) +transpose(X,7) ) ,-5) ,4) ) +transpose(transpose(transpose(shuffle(X) ,-5) ,4) ,7) ) ,4,6) ,12) ,12) ) ,4) ) ,7) ) +transpose(transpose(((arpeggio(transpose(shuffle(transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) |step((X+X) ,12) ) ,7) ) |step(((transpose(X,4) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) +transpose(transpose((arpeggio(shuffle((X+X) ) ) +transpose(((transpose(transpose(X,-5) ,-7) +transpose(((X+transpose(X,12) ) +echo(transpose(X,-5) ,4,6) ) ,4) ) +transpose(transpose((((X+X) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) ,7) ) ,12) ) ,-5) ,7) ) ,4) ) ,4) ) +transpose(shuffle((transpose(transpose(transpose((transpose(transpose(X,-7) ,-7) +transpose(arpeggio(X) ,4) ) ,-5) ,-5) ,-5) +transpose(transpose(transpose(step((echo(transpose((X|X) ,4) ,4,6) +transpose((arpeggio(X) |shuffle(X) ) ,4) ) ,12) ,4) ,4) ,7) ) ) ,4) ) +transpose(transpose((transpose((shuffle(X) |X) ,-5) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,-5) ,-5) ) ,-7) ,7) ) ,-5) ,12) ) ,7) ) ) ,-5)
random seed used was 231738213

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