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 15 generations the expression "X" became this:
(shuffle(transpose(((shuffle(transpose(transpose(X,-7) ,-7) ) |(transpose(echo(shuffle(((transpose(X,4) +transpose(X,4) ) +transpose((X+X) ,7) ) ) ,4,6) ,-5) |((arpeggio(transpose((X+X) ,4) ) +transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose((transpose(X,-5) +transpose((X+transpose(X,12) ) ,7) ) ,4) ,-7) ,7) ) ) ) |echo((shuffle((X+X) ) |(shuffle(transpose(transpose(X,-5) ,-7) ) +((transpose(X,-7) +transpose(transpose((X+X) ,4) ,4) ) +transpose((X|X) ,7) ) ) ) ,4,6) ) ,-7) ) +transpose(((transpose(transpose((step((((((X+X) |echo(X,4,6) ) |shuffle(transpose(X,4) ) ) +transpose(transpose(transpose(echo(X,4,6) ,-5) ,4) ,7) ) +transpose(transpose(X,4) ,12) ) ,12) |transpose(shuffle((X+transpose((X+transpose(transpose(X,-7) ,4) ) ,12) ) ) ,4) ) ,-5) ,-7) +transpose((((transpose((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,-7) +(((X+transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose((X|transpose(X,-7) ) ,-5) ,12) ) ) +transpose(((echo(echo((((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,4,6) ,4,6) +echo((transpose(((X|X) +((step(X,12) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,-5) +transpose((echo(X,4,6) |X) ,4) ) ,4,6) ) +transpose(transpose(step((transpose(((transpose(X,-7) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) +X) ,7) ) ,4) +transpose((transpose(X,-7) |step(((X+X) +transpose(X,7) ) ,12) ) ,-7) ) ,12) ,4) ,12) ) ,7) ) |transpose(transpose(transpose((((step(X,12) |((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) +((X+transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) |((X+transpose(X,12) ) +transpose((X+step(X,12) ) ,12) ) ) +transpose(((step(X,12) +transpose(transpose((X|X) ,-5) ,12) ) |(step(arpeggio(X) ,12) +((X+X) +X) ) ) ,12) ) ,4) ,-7) ,-7) ) ,4) ) +transpose((arpeggio(transpose(transpose(step(X,12) ,-5) ,-5) ) +(transpose(((((transpose(X,4) +X) +transpose(transpose(transpose(X,-5) ,4) ,7) ) +step(X,12) ) +arpeggio((shuffle(X) +transpose(X,7) ) ) ) ,-7) +shuffle(transpose(transpose((transpose(X,-5) +(X+transpose(transpose(X,4) ,12) ) ) ,-7) ,-5) ) ) ) ,7) ) ,12) )
random seed used was 10 EXPR = (((arpeggio((step(arpeggio(transpose(((X+transpose(transpose(X,-7) ,7) ) +echo((X+X) ,4,6) ) ,4) ) ,12) |(transpose((transpose(echo(transpose(X,-7) ,4,6) ,4) |(transpose(X,-5) +transpose((X+echo(X,4,6) ) ,7) ) ) ,4) |transpose(step(transpose(X,-7) ,12) ,-5) ) ) ) +transpose(transpose(((echo(((step(transpose(transpose(X,-5) ,4) ,12) +transpose(transpose((step(X,12) |X) ,-5) ,4) ) +transpose(((((echo(X,4,6) +transpose((X+X) ,4) ) +transpose(X,7) ) +shuffle((X+X) ) ) +((X|X) |X) ) ,7) ) ,4,6) |transpose(shuffle(step(transpose(((echo(X,4,6) +X) +transpose((transpose(X,-5) |transpose(X,-7) ) ,7) ) ,-5) ,12) ) ,-5) ) +((echo(((X+X) |transpose(X,4) ) ,4,6) +transpose(transpose(echo((X|X) ,4,6) ,-5) ,4) ) |((transpose(transpose(X,-7) ,4) +transpose(((transpose(X,-7) +arpeggio(X) ) +transpose(((shuffle(X) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,7) ) +step(transpose(arpeggio(((X|X) |X) ) ,-7) ,12) ) ) ) ,-5) ,4) ) +((step(transpose(transpose((transpose(((step(X,12) +transpose(X,12) ) +(X|X) ) ,-5) +transpose(arpeggio(transpose(transpose(X,-5) ,4) ) ,12) ) ,4) ,-5) ,12) +((transpose(transpose(((((transpose(X,4) +transpose(transpose(X,-5) ,12) ) +transpose((X|(X+transpose(X,12) ) ) ,7) ) |transpose((transpose(X,4) |step((X|X) ,12) ) ,-5) ) +transpose(arpeggio((transpose(X,-5) +(transpose(X,-5) +transpose(X,12) ) ) ) ,7) ) ,-7) ,4) +transpose(arpeggio(transpose(((arpeggio(transpose(X,-5) ) +transpose(echo((X|X) ,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) ) ,-5) ) +transpose(((((((X|(arpeggio(X) +(X+X) ) ) |((X+transpose(step(X,12) ,7) ) +step((X|X) ,12) ) ) +transpose(arpeggio((transpose(transpose(X,4) ,4) +transpose((X|X) ,12) ) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |((echo(((X+transpose((X+transpose(X,12) ) ,7) ) +transpose(step(echo(X,4,6) ,12) ,12) ) ,4,6) +transpose(transpose((X|X) ,-7) ,12) ) |(step((X+X) ,12) |transpose((transpose(X,4) +transpose(transpose(X,-5) ,12) ) ,-7) ) ) ) |echo(transpose((transpose(X,4) |X) ,-5) ,4,6) ) ,7) ) ) |((transpose((shuffle(transpose((((shuffle(X) |transpose(X,-7) ) +transpose(transpose(step((X+transpose(X,7) ) ,12) ,-5) ,7) ) +transpose(transpose(((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ,12) ) ,-7) ) +transpose(arpeggio((transpose(shuffle(transpose(X,-5) ) ,4) +(transpose(arpeggio((X+transpose(X,7) ) ) ,-7) |transpose(transpose(((X+X) |transpose((X|X) ,-5) ) ,-7) ,-5) ) ) ) ,7) ) ,4) +transpose(transpose(arpeggio(echo(transpose((step(transpose(shuffle(X) ,4) ,12) +transpose(((arpeggio(transpose(X,4) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,-7) ,4,6) ) ,-7) ,4) ) +transpose(((transpose(transpose(((X|transpose(X,-7) ) |transpose(X,-7) ) ,4) ,-5) +transpose((step(((transpose(X,4) +transpose(((X|X) +X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) +transpose(transpose(shuffle(X) ,4) ,12) ) ,4) ) +transpose(transpose((arpeggio(transpose((X|X) ,4) ) |(((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(step(step((X|X) ,12) ,12) ,12) ) ) ,4) ,7) ) ,7) ) ) ) |transpose(echo((arpeggio((((transpose(transpose(X,4) ,-7) |X) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) +(transpose(X,4) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +X) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,12) ) ) ) |(step(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |((X+X) |transpose(X,4) ) ) ) ,12) +((transpose((arpeggio(X) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,7) ) ,-7) +transpose(shuffle(step(X,12) ) ,4) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,7) ) ) ) ,4,6) ,4) )
random seed used was 0 EXPR = ((transpose(transpose(arpeggio(echo(shuffle(((X+transpose(X,7) ) +echo((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ) ) ,4,6) ) ,4) ,-5) +transpose(transpose(((arpeggio(echo(step(transpose((((X+transpose(echo(X,4,6) ,4) ) +transpose(transpose(echo(shuffle(arpeggio(X) ) ,4,6) ,4) ,7) ) +transpose(((arpeggio(X) +transpose((X+(X+transpose(X,7) ) ) ,12) ) +transpose(transpose(transpose(transpose(X,-5) ,4) ,-7) ,7) ) ,7) ) ,-7) ,12) ,4,6) ) +transpose((transpose(step(((shuffle(transpose(shuffle(X) ,-7) ) +transpose(echo(transpose(transpose(X,4) ,4) ,4,6) ,4) ) +transpose(transpose((((echo(X,4,6) +transpose((transpose(X,4) +X) ,12) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-7) ,7) ) ,12) ,4) |((transpose(((X+transpose(transpose(shuffle(X) ,-5) ,7) ) +transpose(transpose(transpose((X+X) ,-5) ,-5) ,7) ) ,-7) |transpose(((transpose((X+transpose(X,7) ) ,-7) +transpose(((X+(X+X) ) |transpose(X,-5) ) ,4) ) +transpose(X,7) ) ,-7) ) +((arpeggio(echo(transpose(transpose(X,-7) ,-7) ,4,6) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) ) ,4) ) +transpose(shuffle(((transpose(transpose(((((transpose(echo(arpeggio(X) ,4,6) ,-7) +transpose(transpose(X,4) ,7) ) |(arpeggio(echo((X+X) ,4,6) ) |step(((X+X) +transpose((X|X) ,12) ) ,12) ) ) +(arpeggio(echo(X,4,6) ) +transpose(((step(X,12) +X) +transpose((((X+X) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,7) ) ) |transpose(transpose((X|X) ,-7) ,4) ) ,-5) ,4) +((((X|((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ) |step(echo(X,4,6) ,12) ) +((transpose(X,-7) |(X+X) ) |X) ) +transpose(transpose((X+X) ,4) ,-5) ) ) +step(arpeggio(transpose((((X+transpose(X,4) ) +transpose(arpeggio(shuffle(X) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,-5) ) ,12) ) ) ,7) ) ,-5) ,4) ) +transpose(transpose(((transpose(X,-7) +echo((transpose((X|X) ,4) +transpose(X,4) ) ,4,6) ) |echo(arpeggio(X) ,4,6) ) ,-5) ,7) )
random seed used was 0 EXPR = ((((transpose((arpeggio(step(arpeggio(X) ,12) ) +step(step((X|(X+transpose(X,12) ) ) ,12) ,12) ) ,-5) +shuffle((((((X+X) +transpose((X|(X|X) ) ,7) ) +transpose((transpose(X,4) +transpose(shuffle(X) ,12) ) ,12) ) +transpose((shuffle((((X+X) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(step(X,12) ,-7) ) ,4) ) +transpose((transpose(((X+X) +transpose(X,12) ) ,4) +transpose(((X+X) +(X+X) ) ,12) ) ,7) ) ) ) +transpose(step(transpose(shuffle((transpose((X|X) ,-7) +transpose((X+step((X+transpose((X|X) ,12) ) ,12) ) ,12) ) ) ,4) ,12) ,4) ) +transpose(transpose(step(transpose(shuffle(transpose((transpose(X,-5) +transpose(X,7) ) ,-7) ) ,-5) ,12) ,4) ,7) ) +(((arpeggio(echo((echo((transpose(transpose(X,4) ,-7) +transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,4,6) +transpose(transpose(X,4) ,12) ) ,4,6) ) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) +transpose(step(transpose(((transpose(transpose(echo((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,7) ) ,4,6) ,4) ,4) +transpose(transpose(((X+X) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,-5) ,7) ) +echo(((transpose((X+transpose(X,12) ) ,-7) +transpose(echo(transpose(X,4) ,4,6) ,7) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,-5) ,-5) ) ,4,6) ) ,-7) ,12) ,12) ) |(((transpose((arpeggio(transpose(echo((transpose(X,-7) |X) ,4,6) ,-7) ) +((step(transpose(X,4) ,12) +transpose((X+transpose((X+X) ,7) ) ,7) ) +transpose((X+X) ,4) ) ) ,-7) +transpose(transpose(transpose(arpeggio(step(echo(X,4,6) ,12) ) ,-5) ,-7) ,12) ) +((shuffle(transpose(((transpose(X,-7) +(X+X) ) |X) ,4) ) |transpose(((arpeggio(X) |transpose(X,4) ) |(X+transpose(X,7) ) ) ,-5) ) +transpose(transpose(transpose(((X+transpose(X,12) ) +transpose(X,-7) ) ,-7) ,4) ,7) ) ) +shuffle(((((step(arpeggio(X) ,12) +transpose(((transpose(X,-7) +transpose(arpeggio(X) ,4) ) +transpose((X+X) ,7) ) ,12) ) +transpose(transpose(step(X,12) ,-5) ,-7) ) +transpose(shuffle(transpose(step(transpose(X,-5) ,12) ,-7) ) ,12) ) +(X+(X+transpose(X,7) ) ) ) ) ) ) )
random seed used was 0

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