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 16 generations the expression "X" became this:
echo((transpose(arpeggio((transpose((((arpeggio((X+X) ) +transpose(transpose((X|X) ,4) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) +transpose((((transpose(X,4) +transpose(transpose(X,-7) ,7) ) +transpose(X,-5) ) +transpose((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) ,12) ) ,12) ) ,-5) |transpose(transpose(transpose((step(X,12) +transpose(X,7) ) ,-7) ,-5) ,4) ) ) ,4) +(step(((echo(transpose(transpose((transpose(transpose(transpose(X,-7) ,4) ,-7) +transpose(transpose(((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(step(X,12) ,7) ) ,-5) ,-5) ) ,4) ,-5) ,4,6) |(transpose(arpeggio((transpose(X,-7) |(X+echo(X,4,6) ) ) ) ,-5) +transpose(((((X|X) |transpose((X|X) ,-7) ) +transpose(transpose(transpose(arpeggio(X) ,4) ,-7) ,12) ) +transpose(arpeggio(((X+transpose((X|X) ,4) ) +transpose((X+X) ,7) ) ) ,12) ) ,4) ) ) +transpose(transpose(transpose(transpose(transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,-7) ,-7) ,-5) ,-7) ,4) ,4) ) ,12) |transpose(transpose(shuffle(echo(transpose(arpeggio(((step(X,12) |X) |shuffle((X+X) ) ) ) ,-5) ,4,6) ) ,4) ,4) ) ) ,4,6)
random seed used was 151807041 EXPR = (shuffle(transpose(((((arpeggio(((transpose(step(step(shuffle((X+transpose(X,12) ) ) ,12) ,12) ,4) +transpose((transpose(X,-7) +transpose(step(transpose((X+transpose(X,12) ) ,-7) ,12) ,7) ) ,7) ) +((transpose(transpose(X,-5) ,-5) +transpose(step(transpose(X,-5) ,12) ,12) ) +transpose((((transpose(X,-7) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) |X) +transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ) ,7) ) ) ) +transpose(arpeggio(((transpose(X,4) +shuffle((((X|X) |(X+transpose(X,7) ) ) |step(X,12) ) ) ) +transpose((transpose(transpose((X+transpose(X,12) ) ,4) ,-7) +(step(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-5) ,4) ,12) ) ) ,12) |(((X+transpose(X,7) ) +transpose(shuffle(shuffle(X) ) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ) ) ,12) ) ) ,4) ) +transpose(shuffle(arpeggio(((transpose(X,4) +((X+X) +transpose(transpose(X,-7) ,7) ) ) +transpose((((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(transpose(X,4) ,4) ) +transpose(((X+X) +(X+X) ) ,7) ) ,-5) ) ) ) ,7) ) +transpose(transpose(arpeggio(transpose(transpose(transpose((((echo(X,4,6) |step(X,12) ) +(transpose(X,-7) +transpose(X,7) ) ) +(((step(X,12) +transpose(step(X,12) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) +transpose(((arpeggio(X) +transpose(X,7) ) |X) ,12) ) ) ,-5) ,-7) ,-7) ) ,4) ,7) ) +shuffle((((transpose(transpose((transpose(transpose(X,-7) ,4) +transpose(transpose(X,-7) ,12) ) ,-7) ,-5) +transpose((transpose(transpose((shuffle(X) |X) ,4) ,-7) +arpeggio((echo((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) +transpose((arpeggio(X) |transpose(X,-7) ) ,4) ) ) ) ,12) ) +transpose((transpose(X,-7) +transpose((arpeggio((((X+transpose(X,7) ) +transpose((X+transpose((X+X) ,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) +transpose((((echo(X,4,6) +transpose(transpose((X|X) ,-5) ,12) ) |transpose(arpeggio(X) ,-5) ) +transpose(echo(transpose(transpose(X,4) ,4) ,4,6) ,7) ) ,7) ) ,7) ) ,4) ) +transpose((((transpose(X,-5) +transpose((step(X,12) +transpose(transpose(X,-7) ,4) ) ,12) ) +transpose(arpeggio((((transpose(X,4) +transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((transpose(X,4) +transpose(X,-5) ) ,12) ) ) ,7) ) +shuffle(echo((((X|X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(step((echo(X,4,6) +X) ,12) ,7) ) ,4,6) ) ) ,7) ) ) ) ,-7) ) +echo(transpose((((transpose((transpose(transpose((X+X) ,-5) ,-7) +transpose((((transpose(transpose(X,4) ,4) +(transpose((X|X) ,-7) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,7) ) ) +transpose(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) |X) ,7) ) +((transpose(X,4) +transpose(transpose(shuffle(X) ,-5) ,7) ) |(echo(X,4,6) +transpose(transpose((X+X) ,4) ,7) ) ) ) ,7) ) ,-7) +(((((((transpose(X,4) +transpose((X|(X+transpose((X+transpose(X,7) ) ,7) ) ) ,4) ) +transpose((X+X) ,7) ) +transpose(transpose(X,4) ,-7) ) +(((step(X,12) +transpose(echo(step(X,12) ,4,6) ,12) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |echo(step(X,12) ,4,6) ) ,4) ,4) ) +transpose((X+echo(transpose((X|X) ,-5) ,4,6) ) ,7) ) ) +transpose(((step((step(((X+X) +arpeggio(X) ) ,12) +((X+transpose(echo(X,4,6) ,12) ) +transpose(X,12) ) ) ,12) +echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ) +transpose(transpose((transpose((transpose(X,-7) +transpose(X,7) ) ,4) +arpeggio(((X+transpose(X,7) ) +transpose(X,-5) ) ) ) ,-7) ,12) ) ,4) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ,7) ) +((transpose((transpose(transpose(shuffle(X) ,4) ,-5) +transpose(((shuffle(X) |step(X,12) ) +((X+X) +arpeggio(X) ) ) ,7) ) ,-7) +transpose(echo(((X+(X+X) ) +transpose(X,7) ) ,4,6) ,12) ) |(((transpose(shuffle((X|X) ) ,4) +transpose((X+transpose(transpose(X,-7) ,-7) ) ,7) ) +transpose((((X+transpose(((shuffle(X) +(X+transpose(X,12) ) ) |((X+transpose(transpose(X,-7) ,4) ) +transpose(step(X,12) ,7) ) ) ,12) ) |arpeggio((X+transpose(X,12) ) ) ) |echo(shuffle(transpose(X,4) ) ,4,6) ) ,4) ) +transpose((((shuffle(X) +X) +transpose((X+echo(transpose(X,-5) ,4,6) ) ,7) ) |(transpose(X,-7) +transpose(transpose(X,4) ,-5) ) ) ,7) ) ) ) ) +transpose(((((transpose(transpose(X,-5) ,-5) |((X+transpose((X|X) ,12) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) ) |shuffle((((shuffle(step(X,12) ) +transpose((step(transpose(X,-7) ,12) |echo(X,4,6) ) ,12) ) +transpose((arpeggio(shuffle(transpose(X,-7) ) ) +transpose((transpose((X+X) ,-5) +transpose(transpose(X,4) ,12) ) ,12) ) ,4) ) +transpose((echo(echo(X,4,6) ,4,6) +transpose(X,-7) ) ,7) ) ) ) |step(transpose(transpose(((shuffle((X+transpose(X,7) ) ) +transpose(X,4) ) +transpose((X+X) ,7) ) ,-5) ,-5) ,12) ) |transpose(transpose(shuffle((X+transpose(transpose(X,-5) ,7) ) ) ,4) ,4) ) ,4) ) +transpose(transpose((shuffle(transpose((transpose(transpose(transpose(X,-5) ,4) ,4) +transpose(X,4) ) ,-5) ) +((step(transpose((X+transpose(X,12) ) ,4) ,12) |(echo(transpose(X,4) ,4,6) +transpose(((X+transpose(transpose(X,4) ,12) ) +(transpose(X,-5) |transpose(X,-5) ) ) ,12) ) ) |transpose(transpose(X,-5) ,-5) ) ) ,-5) ,7) ) ,4) ,4,6) )
random seed used was 0 EXPR = transpose(transpose(transpose((transpose((transpose(transpose((X+transpose(X,7) ) ,4) ,4) +transpose(echo((transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,-5) +shuffle(arpeggio(X) ) ) ,4,6) ,-5) ) ,-5) +(arpeggio(transpose(shuffle(transpose(transpose(transpose(X,-5) ,-5) ,-7) ) ,-5) ) +arpeggio((((((((X+transpose((X|X) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,7) ) |shuffle(X) ) |transpose((X|X) ,-5) ) +transpose((((transpose(X,-7) +transpose(X,-7) ) +(shuffle(X) |transpose(X,-5) ) ) |transpose(transpose(X,-7) ,4) ) ,4) ) +transpose(shuffle(((X+transpose(X,12) ) +(X+transpose(X,7) ) ) ) ,7) ) ) ) ) ,-5) ,-7) ,4)
random seed used was 0 EXPR = (transpose(transpose(((transpose(arpeggio((transpose((transpose(transpose(X,4) ,4) +transpose(((X+transpose(X,7) ) +shuffle(X) ) ,12) ) ,-5) +transpose(echo(shuffle(X) ,4,6) ,-7) ) ) ,-7) +transpose(((transpose(step((step(((((X+transpose(X,4) ) +transpose(X,7) ) +X) +transpose(shuffle(X) ,12) ) ,12) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,12) ,4) +transpose((step(echo(X,4,6) ,12) |(transpose(X,-5) |echo((X+(X+transpose(X,7) ) ) ,4,6) ) ) ,-5) ) +transpose(transpose(shuffle(transpose((X+(X|X) ) ,4) ) ,-5) ,12) ) ,4) ) +transpose(step(arpeggio((shuffle(transpose(arpeggio(X) ,4) ) +transpose((step(X,12) +transpose(X,-7) ) ,7) ) ) ,12) ,7) ) ,-7) ,-7) +(transpose(echo((echo(arpeggio(((((X+arpeggio(X) ) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,7) ) +transpose((((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(X,-7) ) ,12) ) ) ,4,6) +shuffle((transpose((transpose(X,-7) +transpose((X+transpose(arpeggio(X) ,7) ) ,12) ) ,4) +transpose((echo((step(X,12) +(X+transpose(X,7) ) ) ,4,6) +transpose(step(step(transpose(X,-5) ,12) ,12) ,-5) ) ,12) ) ) ) ,4,6) ,-5) +transpose(transpose(step((transpose((transpose(transpose((X+transpose((X+X) ,7) ) ,-5) ,4) +(step(X,12) +transpose(transpose(transpose(arpeggio(X) ,-5) ,-7) ,12) ) ) ,-5) +transpose(shuffle((X|X) ) ,7) ) ,12) ,4) ,7) ) )
random seed used was 0

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