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(echo((echo(shuffle(transpose(transpose(echo((shuffle((step(X,12) +transpose(transpose(X,4) ,-7) ) ) +(((X+transpose(X,12) ) +X) +transpose(X,7) ) ) ,4,6) ,-5) ,4) ) ,4,6) |transpose((transpose(((((transpose(X,4) +(X+transpose(X,7) ) ) +(((X|X) +transpose(X,7) ) +transpose(X,7) ) ) +transpose((transpose(((X|X) |echo(X,4,6) ) ,-5) +transpose((transpose(X,-7) +transpose(transpose(X,4) ,-5) ) ,12) ) ,4) ) +transpose(step(transpose(transpose(X,-7) ,4) ,12) ,7) ) ,-7) +transpose(transpose(transpose(((transpose((transpose(X,-5) |((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) ,4) |((echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose(X,-5) ,12) ) ) +transpose(transpose((((X+transpose(X,12) ) |((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(((transpose(X,-7) |(X+X) ) +X) ,7) ) ,-7) ,7) ) ,4) ,-5) ,12) ) ,4) ) ,4,6) ,-7)
random seed used was 9 EXPR = (((arpeggio(transpose(transpose(echo(transpose(transpose((((transpose(X,-7) +transpose(transpose(transpose(X,4) ,4) ,12) ) +((X+transpose(((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) |transpose((X+transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |transpose(X,-5) ) ,12) ) ,-7) ) ,-5) ,-7) ,4,6) ,4) ,-7) ) +step(((shuffle(transpose(transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(((X|X) +arpeggio(X) ) ,4) ) +transpose((transpose(X,-7) |shuffle(X) ) ,7) ) ,4) ,4) ) +transpose(transpose((step((echo((X+X) ,4,6) +transpose(transpose(((X+X) +X) ,4) ,12) ) ,12) +(transpose((X|(X+transpose(X,12) ) ) ,4) +arpeggio(transpose(X,4) ) ) ) ,4) ,12) ) +transpose((shuffle((step(transpose(X,-5) ,12) +transpose(transpose(((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) ,12) ) ) +transpose(((echo(arpeggio(transpose(X,4) ) ,4,6) +transpose((transpose(X,-5) |((X|X) +transpose(X,-5) ) ) ,7) ) |(((X+transpose(X,12) ) +transpose(step(X,12) ,7) ) |X) ) ,7) ) ,12) ) ,12) ) +transpose(((((((((transpose(echo(step(transpose(transpose((step(X,12) |X) ,4) ,4) ,12) ,4,6) ,-5) +transpose(((arpeggio(((X+transpose(arpeggio((arpeggio(X) |shuffle(X) ) ) ,4) ) +transpose((arpeggio((X+X) ) |step(X,12) ) ,7) ) ) +(transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) +(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) |step(echo(shuffle(X) ,4,6) ,12) ) ) ) +transpose(transpose(transpose(shuffle(transpose(X,-7) ) ,-7) ,-7) ,7) ) ,4) ) +transpose((step(transpose((transpose(X,-7) |echo(X,4,6) ) ,-7) ,12) |transpose((((transpose((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4) |((transpose(X,-7) +transpose(transpose(X,4) ,7) ) +transpose((X+transpose(X,12) ) ,12) ) ) +transpose((X+transpose((X+X) ,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,-5) ) ,7) ) +transpose((((transpose(X,-5) +(X|X) ) |echo((((transpose(X,4) +step(X,12) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) +transpose(((X|X) +transpose(X,7) ) ,12) ) ,4,6) ) +transpose((((X+transpose(X,-5) ) |step(X,12) ) +transpose(transpose(transpose((X+X) ,4) ,-5) ,12) ) ,12) ) ,4) ) +transpose((((echo(X,4,6) +transpose((((X+X) +transpose(((X+X) +X) ,4) ) +transpose(X,7) ) ,12) ) +transpose((transpose((X+transpose(X,12) ) ,-5) |shuffle((transpose(X,-5) |step(X,12) ) ) ) ,7) ) +transpose((transpose(((X+X) +step(arpeggio(X) ,12) ) ,-5) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) |(X+X) ) ,-7) ,12) ) ,12) ) ,7) ) |transpose(transpose((((echo(X,4,6) +transpose((arpeggio(((X+transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) |((X+X) +echo(X,4,6) ) ) ,12) ) +transpose(transpose((X|transpose(echo(X,4,6) ,-7) ) ,4) ,7) ) +transpose((shuffle(transpose(step(transpose(X,-7) ,12) ,4) ) |arpeggio(((echo(X,4,6) +transpose(X,-5) ) +shuffle(shuffle(transpose(transpose(X,4) ,-5) ) ) ) ) ) ,7) ) ,-5) ,4) ) +transpose(transpose((shuffle(((((((X|X) +transpose(X,12) ) +transpose(echo(transpose(arpeggio((X+step(X,12) ) ) ,-7) ,4,6) ,12) ) +transpose(transpose(X,-5) ,12) ) +transpose(echo(transpose((((X+X) |(X|X) ) +transpose((transpose(X,4) +(X+X) ) ,12) ) ,-7) ,4,6) ,4) ) +transpose((step((X+transpose(transpose(X,4) ,12) ) ,12) |echo(transpose(((arpeggio(X) |(X+transpose(X,12) ) ) +transpose(transpose(X,4) ,7) ) ,-5) ,4,6) ) ,7) ) ) +transpose(arpeggio(echo(((transpose(transpose((X|X) ,-7) ,-5) +transpose(transpose(((shuffle(step(X,12) ) |echo(X,4,6) ) |step((shuffle(X) |transpose(X,4) ) ,12) ) ,-7) ,4) ) +transpose(((shuffle((X+arpeggio(X) ) ) +transpose(((X+(X|X) ) +transpose(X,7) ) ,12) ) +transpose(transpose(transpose(transpose(X,4) ,-5) ,4) ,7) ) ,7) ) ,4,6) ) ,-7) ) ,4) ,4) ) +transpose(step(transpose(echo((transpose(arpeggio(((X+step(X,12) ) +(transpose(X,-5) +transpose((X+X) ,12) ) ) ) ,4) |(transpose(transpose((transpose(X,4) +transpose((step(X,12) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-7) ,-7) +transpose((((step(transpose(transpose(X,-7) ,4) ,12) |transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,-7) ) +transpose(((transpose(((X+transpose(X,-7) ) |X) ,-7) +transpose(transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +((X+transpose(X,7) ) |shuffle(X) ) ) ,-5) ,4) ) +transpose((((X+transpose(X,12) ) +echo(X,4,6) ) +transpose(((X|X) +step(X,12) ) ,12) ) ,7) ) ,4) ) +transpose(((transpose(X,4) |(transpose(X,4) +transpose(X,-7) ) ) +X) ,7) ) ,7) ) ) ,4,6) ,4) ,12) ,7) ) +transpose(arpeggio((((transpose(echo(X,4,6) ,-7) +transpose(echo(step(transpose(transpose((X|X) ,-5) ,-5) ,12) ,4,6) ,4) ) +transpose((step(transpose((arpeggio(transpose(shuffle(X) ,4) ) +transpose(shuffle(shuffle((X+transpose(X,7) ) ) ) ,7) ) ,4) ,12) |transpose(transpose(echo((shuffle(transpose(X,-5) ) |transpose(X,-5) ) ,4,6) ,-7) ,-7) ) ,4) ) +transpose((transpose(((((transpose(X,-5) |echo((transpose(X,4) +transpose(X,12) ) ,4,6) ) +transpose(((transpose((X+transpose(X,7) ) ,4) +(transpose(X,-5) +transpose(transpose(X,-7) ,7) ) ) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) ,4) ) +transpose((step(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,12) +transpose(X,7) ) ,7) ) +transpose((((X+X) +shuffle((X|transpose(X,4) ) ) ) |(transpose(transpose(echo(X,4,6) ,-5) ,-5) +transpose(shuffle(X) ,4) ) ) ,12) ) ,-5) +transpose((transpose((transpose(transpose((echo(X,4,6) +step((X|X) ,12) ) ,-7) ,-5) |transpose((shuffle(transpose(X,4) ) +transpose(X,-5) ) ,-7) ) ,4) +(((echo(transpose(X,-7) ,4,6) |step(transpose((X+transpose(X,7) ) ,-5) ,12) ) +transpose(transpose(transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ,-5) ,-7) ,7) ) |((transpose((shuffle(transpose((shuffle(X) |(X+X) ) ,-7) ) |transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +echo(X,4,6) ) ,4) ) ,4) +transpose(transpose(echo(shuffle(X) ,4,6) ,4) ,-7) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,12) ) ) ) ,12) ) ,7) ) ) ,12) ) ,4) ) +transpose((transpose(arpeggio((transpose((echo(transpose((X+X) ,-5) ,4,6) +transpose(transpose(arpeggio(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) ,-5) ,-7) ) ,-7) ,7) ) ,4) +transpose(transpose(transpose((arpeggio(X) |transpose(transpose(X,4) ,-5) ) ,-5) ,4) ,12) ) ) ,-5) |transpose((transpose(transpose(shuffle(transpose(transpose((((X+X) +transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ,-5) ,4) ) ,4) ,4) +transpose(step(echo(transpose(transpose(transpose(transpose((X|X) ,4) ,4) ,-7) ,-7) ,4,6) ,12) ,7) ) ,4) ) ,7) )
random seed used was 0 EXPR = transpose(((transpose((step((step(arpeggio((X+transpose(transpose(X,-5) ,12) ) ) ,12) +((transpose((X+X) ,-7) |(X|X) ) +transpose(transpose(X,-7) ,7) ) ) ,12) +((((arpeggio(X) +transpose(transpose(X,-5) ,7) ) +transpose((X|X) ,12) ) |(((arpeggio(X) |transpose(X,-7) ) +transpose(X,4) ) +transpose(((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,7) ) ) +transpose(shuffle(((X|X) |((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ) ) ,12) ) ) ,-5) +echo(step(transpose((transpose(X,-5) +transpose(transpose(transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ,-7) ,4) ,12) ) ,4) ,12) ,4,6) ) +(transpose(shuffle((X+transpose(transpose(X,-5) ,12) ) ) ,4) +transpose(transpose(((transpose(X,-5) +transpose((shuffle(X) |transpose(X,4) ) ,7) ) +step(transpose(transpose(X,-7) ,-5) ,12) ) ,4) ,12) ) ) ,-5)
random seed used was 0 EXPR = transpose(echo((transpose(arpeggio(transpose(transpose((arpeggio((shuffle(X) |transpose(X,-7) ) ) |(X+X) ) ,-5) ,4) ) ,-5) +transpose(arpeggio(transpose(step(step((echo((X+transpose(X,12) ) ,4,6) +transpose(transpose(((transpose((X+X) ,-7) +transpose(arpeggio(X) ,4) ) +transpose(((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ,7) ) ,4) ,12) ) ,12) ,12) ,-7) ) ,4) ) ,4,6) ,-5)
random seed used was 0

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