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:
transpose((transpose(transpose((((transpose(X,4) +transpose((transpose(step(X,12) ,4) +((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) ,7) ) +(X+transpose(X,7) ) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ,7) ) ,-7) ,4) +transpose(step((((echo((transpose(transpose(X,-5) ,-5) +transpose((transpose(X,4) +transpose((X+transpose((X+X) ,12) ) ,12) ) ,7) ) ,4,6) |shuffle(arpeggio((X+X) ) ) ) +(step(transpose((echo(X,4,6) +transpose(shuffle(echo(X,4,6) ) ,12) ) ,-7) ,12) |transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,4) ,-5) ) ) +(shuffle(((shuffle(echo((X+X) ,4,6) ) +(step(X,12) +transpose(transpose(X,4) ,12) ) ) +transpose(transpose((transpose(transpose((X+(X+transpose(X,12) ) ) ,-7) ,-5) +(transpose(echo(X,4,6) ,-5) +transpose(shuffle(X) ,7) ) ) ,-7) ,7) ) ) |(((echo((transpose((transpose((X+(X|X) ) ,-7) |transpose(((X+X) +transpose(X,4) ) ,4) ) ,-7) |(step((X+transpose(X,12) ) ,12) +transpose(X,12) ) ) ,4,6) +transpose(step(((((transpose(X,-5) +(X+transpose(X,7) ) ) +arpeggio(X) ) +transpose(((step(X,12) |((X+X) +X) ) +transpose(arpeggio(transpose(echo(X,4,6) ,-7) ) ,12) ) ,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(transpose((arpeggio((X+X) ) +transpose((transpose((X|X) ,4) |(X+transpose(echo(X,4,6) ,12) ) ) ,12) ) ,-5) ,7) ) |((transpose(shuffle(((X|transpose(X,4) ) +echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ) ) ,-5) +transpose((((transpose(step((transpose(X,4) +((X+X) +transpose(X,4) ) ) ,12) ,-5) +transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) ,4,6) ,12) ) +transpose((shuffle(transpose(shuffle(echo(X,4,6) ) ,-7) ) +echo(echo(X,4,6) ,4,6) ) ,4) ) +transpose((arpeggio(X) +((transpose(X,4) |arpeggio(X) ) +transpose(X,7) ) ) ,7) ) ,4) ) +transpose((transpose((((echo(transpose(X,4) ,4,6) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(shuffle((X+((step(X,12) +transpose((X+X) ,4) ) +transpose(X,7) ) ) ) ,7) ) ,-5) +transpose(shuffle((((arpeggio(X) +transpose(X,-5) ) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) ) ,-7) ) ,7) ) ) ) ) ,12) ,12) ) ,-7)
random seed used was 10201 EXPR = ((shuffle((transpose(transpose(arpeggio(transpose(X,-7) ) ,-5) ,-5) |shuffle(transpose((X+X) ,-7) ) ) ) +transpose(((X|X) +transpose((X|(transpose(X,4) +transpose(X,12) ) ) ,7) ) ,12) ) |step((((((((X+echo(X,4,6) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) +transpose((shuffle(X) |transpose(X,4) ) ,4) ) +transpose(((X+transpose(X,7) ) +transpose((((X+X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) |(((((X|X) +transpose(((X|X) |(X+X) ) ,7) ) |((X+transpose(X,12) ) +X) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose(echo(shuffle(X) ,4,6) ,-7) ,12) ) ) +transpose(echo((transpose(arpeggio(echo(echo(shuffle(X) ,4,6) ,4,6) ) ,4) |(((arpeggio(X) +(X+transpose(X,7) ) ) +transpose(transpose((step(X,12) +transpose(X,12) ) ,-7) ,4) ) +transpose(((step(X,12) |echo(X,4,6) ) |transpose(X,-5) ) ,7) ) ) ,4,6) ,7) ) |((transpose(transpose(shuffle(X) ,4) ,-7) +((arpeggio((transpose(X,4) +(X+X) ) ) +transpose(X,7) ) |(X+transpose(transpose((step(X,12) +(X+transpose(X,12) ) ) ,-7) ,12) ) ) ) +shuffle(((transpose(arpeggio(X) ,-5) +transpose(transpose((shuffle(X) |(X|X) ) ,-5) ,7) ) +(X+transpose(X,7) ) ) ) ) ) ,12) )
random seed used was 0 EXPR = step((shuffle((((transpose((echo((echo(X,4,6) +transpose(X,4) ) ,4,6) +transpose(((transpose(X,4) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) |(transpose((X|X) ,-7) |transpose(X,4) ) ) ,12) ) ,4) +transpose((((transpose(step(X,12) ,-5) +transpose(transpose(X,-7) ,12) ) +transpose((X|X) ,4) ) +transpose(transpose(((X+transpose(X,12) ) |arpeggio(X) ) ,-5) ,7) ) ,7) ) +transpose(transpose(transpose((transpose((transpose(((X+X) +transpose(X,-7) ) ,4) +transpose(step((X|X) ,12) ,12) ) ,-5) |transpose(transpose((X+X) ,-7) ,-7) ) ,-5) ,-7) ,4) ) +transpose((((((transpose(transpose(X,-7) ,4) +((transpose(X,4) |transpose(arpeggio(X) ,-5) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) +transpose((((((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) +transpose((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |transpose(X,-7) ) ,12) ) +(transpose(X,-7) +transpose(((X+X) |transpose(X,4) ) ,12) ) ) +transpose((X+X) ,4) ) +transpose((arpeggio((X+X) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) ,7) ) ,4) ) +transpose((((transpose(X,-7) +(X+X) ) +echo(transpose(X,4) ,4,6) ) |(transpose((X+transpose(X,12) ) ,-5) +transpose((X|X) ,12) ) ) ,7) ) +transpose(shuffle((echo(echo(X,4,6) ,4,6) |echo((((transpose(X,-7) +transpose(shuffle((X|X) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +(X|X) ) ,4,6) ) ) ,4) ) +transpose((((X+X) |arpeggio(shuffle(X) ) ) +transpose(((echo((X+X) ,4,6) +transpose((shuffle(step(X,12) ) |transpose((X+transpose(X,12) ) ,4) ) ,12) ) +transpose(transpose(step(step(X,12) ,12) ,4) ,7) ) ,7) ) ,7) ) ,7) ) ) +step((((((transpose((((X+X) +transpose(X,12) ) |((X+transpose(X,4) ) +transpose((X+X) ,7) ) ) ,-5) +transpose(X,7) ) +transpose((transpose(X,-5) +(shuffle(X) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) ) ,7) ) +transpose(transpose((((X+transpose(X,7) ) +transpose(step(X,12) ,4) ) |arpeggio((echo((X|X) ,4,6) +shuffle(X) ) ) ) ,-5) ,4) ) +transpose(step(transpose(transpose(echo((arpeggio(X) +transpose(((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ,12) ) ,4,6) ,-7) ,4) ,12) ,7) ) +transpose((transpose(((((transpose(X,4) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +transpose(((transpose((X|X) ,4) +transpose(step(X,12) ,4) ) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ,7) ) ,4) +step((((step(X,12) +transpose(step(X,12) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,12) ) ,-5) ) ,12) ) ,12)
random seed used was 0 EXPR = (echo((transpose(((step(transpose(transpose(transpose((X+X) ,-5) ,-5) ,-5) ,12) +transpose(shuffle((((X+(X|X) ) +transpose(arpeggio(shuffle((X|X) ) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ) ,12) ) |(transpose(step(transpose(step((X+X) ,12) ,4) ,12) ,-7) +transpose((((echo(((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) +transpose(echo(X,4,6) ,4) ) +transpose((transpose(((X+transpose((X+transpose(X,12) ) ,12) ) +(((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,-5) +transpose((shuffle(((X|X) |transpose(X,-7) ) ) |step((X+transpose(X,12) ) ,12) ) ,7) ) ,7) ) |transpose(transpose((((X+X) +transpose((X+transpose(X,7) ) ,12) ) +transpose(transpose(X,-5) ,-5) ) ,-5) ,-7) ) ,7) ) ) ,4) +transpose(arpeggio((((((echo((transpose(X,-5) +transpose(X,12) ) ,4,6) |((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose((step(transpose(X,-5) ,12) +transpose(((transpose(X,4) +transpose(X,7) ) +transpose((transpose(X,4) |X) ,12) ) ,7) ) ,7) ) ) +transpose(((transpose(arpeggio(X) ,-5) |(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |(X+X) ) ) +transpose(((transpose(transpose(transpose(X,-7) ,-5) ,-7) +transpose(step(transpose(transpose(X,-7) ,4) ,12) ,4) ) +transpose(((transpose(X,4) +X) +transpose(((transpose((X+transpose(X,7) ) ,-5) +transpose(X,7) ) |arpeggio(transpose(X,4) ) ) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(((((echo(transpose((X+X) ,4) ,4,6) +transpose(transpose((X+X) ,4) ,12) ) |(transpose(transpose((X+X) ,-5) ,4) +(((transpose(X,4) +transpose(X,4) ) +transpose((X|X) ,7) ) |arpeggio((X+transpose(X,7) ) ) ) ) ) +transpose(((X+transpose(transpose(X,-7) ,12) ) +transpose(X,-7) ) ,4) ) +transpose(shuffle(arpeggio((transpose(X,-5) +transpose(X,-7) ) ) ) ,7) ) ,4) ,7) ) +transpose(arpeggio(echo(((((X|X) +(transpose(X,4) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ) |step(step(transpose(X,-7) ,12) ,12) ) +((echo((transpose((X+X) ,4) +transpose(X,4) ) ,4,6) +transpose(transpose((step(transpose(X,4) ,12) +(echo(X,4,6) |X) ) ,-7) ,4) ) +transpose((transpose(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(step(X,12) ,7) ) ,-5) |(X+X) ) ,7) ) ) ,4,6) ) ,7) ) +transpose(((((echo(echo(echo(transpose(X,-7) ,4,6) ,4,6) ,4,6) +(((step(X,12) +(X|X) ) +(X+X) ) +transpose((((X+X) +transpose((X|X) ,12) ) +transpose((echo(X,4,6) |(X+transpose(X,12) ) ) ,7) ) ,7) ) ) +(echo((transpose(X,4) +transpose(X,4) ) ,4,6) |(shuffle(X) |(X|X) ) ) ) |transpose((step((transpose((((X+transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) ,4) +step((X+X) ,12) ) ,12) +transpose(shuffle(step((((transpose((X|X) ,4) +transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(shuffle(X) ,12) ) ,12) ) ,12) ) ,-5) ) +transpose(arpeggio(echo((transpose(transpose(transpose(((echo(X,4,6) +transpose((X|X) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,4) ,4) ,4) |transpose((X|(X+transpose((X+X) ,7) ) ) ,-7) ) ,4,6) ) ,12) ) ,12) ) ) ,7) ) ,4,6) +transpose(((transpose(transpose(echo(shuffle(arpeggio((X|X) ) ) ,4,6) ,4) ,4) |(((arpeggio(transpose((X|(transpose(X,4) +transpose((X+X) ,7) ) ) ,-5) ) +transpose(transpose(arpeggio(step(echo(((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(((X+transpose(X,12) ) |(X|X) ) ,4) ) +transpose((X|X) ,7) ) ,4,6) ,12) ) ,-5) ,4) ) +transpose((((transpose(((transpose(X,-5) +transpose(((transpose(X,4) +transpose(echo(X,4,6) ,12) ) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) |(((((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose((X+X) ,4) ,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) +transpose(shuffle(shuffle(X) ) ,-5) ) +transpose(((((echo(X,4,6) |arpeggio(X) ) +transpose(X,12) ) +transpose(transpose((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose(transpose((transpose(X,-7) +transpose(X,-5) ) ,4) ,7) ) ,4) ) +transpose(((X+(echo(X,4,6) +X) ) +transpose((((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(shuffle(X) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ,7) ) ) +transpose(step((arpeggio(arpeggio((X|(X+transpose(X,12) ) ) ) ) |((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) +(((X+transpose(X,7) ) +transpose(X,12) ) |(X+transpose(transpose(X,-7) ,12) ) ) ) +shuffle(((X|X) |(X+transpose(transpose(X,-7) ,12) ) ) ) ) ) ,12) ,4) ) +transpose(((echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) +transpose(step(step(X,12) ,12) ,7) ) +transpose(transpose((step(transpose((X+transpose(X,7) ) ,-5) ,12) +transpose(X,-5) ) ,-7) ,7) ) ,7) ) ,7) ) +shuffle(transpose(transpose((transpose((X+transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,-5) +transpose(transpose(transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,-7) ,4) ,12) ) ,-5) ,-5) ) ) ) |transpose(((echo(transpose(((X|X) +transpose((X|X) ,12) ) ,4) ,4,6) |((shuffle(((step(X,12) |transpose(X,-7) ) +(transpose(X,-5) +transpose(X,7) ) ) ) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose(((X+X) +(X|X) ) ,7) ) ) |transpose(echo(transpose((((X+X) +transpose(transpose(X,-5) ,12) ) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,-7) ,4,6) ,-5) ) ,-7) ) ,7) )
random seed used was 0

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