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:
arpeggio(((arpeggio((step(transpose(transpose(X,4) ,-5) ,12) +transpose((transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) ,-7) |((transpose((X|X) ,-7) +transpose(transpose(X,4) ,4) ) +transpose(((X+X) +transpose(X,7) ) ,7) ) ) ,7) ) ) +transpose(((((arpeggio(transpose((X|X) ,-7) ) +transpose(transpose((transpose(transpose(step(X,12) ,4) ,-7) |(echo((X+transpose(X,7) ) ,4,6) +transpose(transpose(arpeggio(X) ,-7) ,12) ) ) ,4) ,7) ) +transpose((arpeggio(arpeggio((arpeggio(X) +(X+transpose((X|X) ,12) ) ) ) ) |transpose(transpose(arpeggio(step(X,12) ) ,4) ,4) ) ,4) ) +transpose((transpose(arpeggio((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) ,4) |step(arpeggio(X) ,12) ) ,7) ) +transpose((((step(transpose(X,-7) ,12) |transpose(arpeggio(X) ,-7) ) +transpose(arpeggio(echo(transpose(X,4) ,4,6) ) ,7) ) |((transpose(step((X+X) ,12) ,-7) +transpose((transpose(arpeggio(echo(X,4,6) ) ,-7) +transpose(((X+X) |X) ,-7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ) ,7) ) +transpose(transpose((transpose(step((step((transpose(X,-5) |(transpose(X,-7) +transpose(shuffle(X) ,7) ) ) ,12) +transpose(step(step(((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,12) ,12) ,7) ) ,12) ,-5) |(transpose(transpose(X,-5) ,4) |transpose(echo(((transpose(transpose((X+transpose(X,-5) ) ,-7) ,4) +((transpose(transpose(((X|X) +transpose((X|X) ,12) ) ,4) ,4) +transpose((transpose(X,4) +transpose(X,7) ) ,4) ) +transpose((transpose(X,-7) +transpose((transpose(X,4) +transpose(X,-5) ) ,12) ) ,7) ) ) +transpose(transpose(((((transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) |transpose(X,-5) ) +transpose(step((X+X) ,12) ,7) ) +arpeggio(((transpose(echo(X,4,6) ,-5) +transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) ,-5) ,12) ) ,4,6) ,-5) ) ) ,-7) ,7) ) )
random seed used was 112709307 EXPR = ((transpose(step(transpose(transpose(step(step(X,12) ,12) ,4) ,-7) ,12) ,4) +transpose(transpose(((transpose(transpose((arpeggio((shuffle(transpose(X,-7) ) |arpeggio((X|X) ) ) ) +transpose(echo((((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,7) ) ,-7) ,4) |arpeggio((step(((arpeggio(X) +transpose(shuffle(step(X,12) ) ,4) ) +transpose(X,7) ) ,12) |((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) ) ) |((echo(transpose((step(X,12) |X) ,-7) ,4,6) +transpose((((transpose((((X+X) |((X+transpose(X,12) ) |shuffle(X) ) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,12) ) ,-5) +transpose(transpose(X,-5) ,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |echo(transpose(transpose((X+transpose(X,7) ) ,4) ,4) ,4,6) ) ,4) ) +transpose(((transpose(transpose(echo(X,4,6) ,-7) ,-7) +transpose((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(((((X+transpose((X+transpose(X,7) ) ,7) ) +transpose((step(X,12) +transpose(transpose(X,-5) ,12) ) ,7) ) +transpose(X,4) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(transpose((transpose(((X|X) +transpose(shuffle(X) ,12) ) ,4) +transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,12) ) +transpose(X,12) ) ) ,12) ,7) ) ,4) ,7) ) ) ,-7) ,12) ) +transpose((transpose(transpose(transpose(shuffle(step(step(echo(transpose(X,-5) ,4,6) ,12) ,12) ) ,-5) ,4) ,-7) +transpose(transpose(step(transpose(((transpose(arpeggio(((X+(X+arpeggio(X) ) ) +X) ) ,-5) +transpose(transpose(echo(arpeggio((transpose(X,4) |transpose(shuffle(X) ,4) ) ) ,4,6) ,-7) ,12) ) |transpose(transpose(transpose(X,4) ,4) ,-7) ) ,-7) ,12) ,-5) ,7) ) ,4) )
random seed used was 0 EXPR = echo((transpose(shuffle(transpose((transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ,-7) +step(transpose((shuffle(X) +transpose(X,7) ) ,4) ,12) ) ,-5) ) ,4) |transpose(transpose(shuffle(transpose((((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose((transpose(X,-7) |transpose(X,-5) ) ,12) ) +transpose((transpose(X,4) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose(transpose((X+transpose(arpeggio(X) ,7) ) ,-7) ,7) ) ,-7) ) ,-7) ,4) ) ,4,6)
random seed used was 0 EXPR = (echo(transpose((transpose((transpose((arpeggio((transpose(echo(X,4,6) ,-7) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) ) ) +(((step(X,12) +(X|(X+transpose(X,7) ) ) ) +transpose((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ,4) ) +transpose((X|(X+transpose(X,7) ) ) ,7) ) ) ,4) +(((shuffle(echo(X,4,6) ) +(((X+transpose(X,7) ) +transpose(X,4) ) +X) ) +(arpeggio(echo(echo(X,4,6) ,4,6) ) +transpose(transpose(X,4) ,12) ) ) +transpose((transpose(arpeggio(step(arpeggio(X) ,12) ) ,-7) |((transpose((X|X) ,-5) |((X+transpose(X,12) ) |transpose((X+transpose(X,12) ) ,-7) ) ) |transpose((X+transpose(((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,-5) ) ) ,12) ) ) ,-7) |transpose((transpose(echo(transpose(X,-7) ,4,6) ,4) +transpose(transpose((arpeggio(X) +X) ,-7) ,12) ) ,4) ) ,4) ,4,6) |(transpose(((((transpose((transpose(transpose((X|X) ,-5) ,-5) +transpose(echo(X,4,6) ,-7) ) ,4) +transpose(((transpose(((transpose((((step(((X+X) +X) ,12) +transpose(transpose(X,-5) ,4) ) +((step(X,12) +arpeggio(X) ) +echo(X,4,6) ) ) +step(X,12) ) ,-5) +transpose(echo(((((((X|(X+X) ) +transpose(((transpose(X,-7) +transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) |transpose(X,-7) ) +transpose(arpeggio(transpose(transpose(((X|X) +transpose(transpose(X,4) ,7) ) ,4) ,-7) ) ,4) ) +transpose((echo((transpose(X,-7) |(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4,6) +(transpose(X,-5) +X) ) ,7) ) ,4,6) ,4) ) +transpose((step(transpose(transpose(X,-5) ,-7) ,12) +(arpeggio((X|X) ) +transpose(X,12) ) ) ,7) ) ,-7) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose((((((step(X,12) +transpose(transpose((transpose(X,-5) |transpose(transpose(X,-7) ,-7) ) ,-5) ,12) ) |shuffle((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) +transpose(((transpose(X,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose((X+X) ,4) ,-5) ,7) ) ,12) ) +transpose(shuffle(((transpose(transpose(X,4) ,4) +transpose((((X|X) +transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,4) ) +transpose(step(arpeggio(X) ,12) ,7) ) ) ,7) ) +transpose(transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ,4) ,4) ) ,7) ) ,4) ) +transpose((transpose(transpose(shuffle(echo((transpose(transpose(transpose(X,-7) ,4) ,4) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,4,6) ) ,-5) ,-5) +transpose((transpose(step(arpeggio(transpose(X,4) ) ,12) ,-7) +transpose(transpose((((transpose(transpose((X|X) ,4) ,-5) |transpose(X,-5) ) +transpose(((((X+transpose(X,-7) ) +transpose(transpose(transpose((X|X) ,-7) ,4) ,7) ) +transpose((transpose((X+transpose(X,12) ) ,4) +transpose((arpeggio(X) +transpose((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ,12) ) ,12) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(echo(transpose(shuffle((X+transpose(X,12) ) ) ,4) ,4,6) ,4) ,7) ) ,-5) ,12) ) ,12) ) ,7) ) +transpose(transpose(((step(transpose(transpose(((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ,4) ,-7) ,12) +transpose(echo(((arpeggio(X) +echo(transpose(X,-7) ,4,6) ) |((X|X) +transpose(transpose(X,4) ,12) ) ) ,4,6) ,7) ) +((((((((X+transpose(X,4) ) +transpose(X,7) ) |(transpose(X,-5) +transpose((transpose(X,-7) +X) ,12) ) ) +transpose(transpose((X+X) ,4) ,-7) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) +transpose(((transpose(transpose(transpose(X,4) ,-5) ,-5) |arpeggio(transpose(X,-7) ) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose((transpose(arpeggio(X) ,-7) +echo((X+X) ,4,6) ) ,7) ) ) ,4) ) +transpose(((transpose(transpose(step((transpose(X,-7) +X) ,12) ,4) ,-7) +transpose(transpose(step((((X+X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ,4) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose(step((((transpose(X,-7) +transpose((transpose(X,-5) |transpose(((X|X) +X) ,4) ) ,12) ) +transpose((shuffle((transpose((X+X) ,-5) +(((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ) ) |(step(transpose(X,4) ,12) +transpose(X,4) ) ) ,4) ) +transpose(transpose((arpeggio(X) |transpose(X,4) ) ,-5) ,7) ) ,12) ,12) ) ) ,-5) ,4) ) +transpose(transpose(((transpose(transpose((arpeggio((transpose(echo(X,4,6) ,-7) +transpose(((X|X) |(X+transpose(X,12) ) ) ,12) ) ) +step((transpose(X,-7) +transpose((X+X) ,-7) ) ,12) ) ,4) ,-5) +transpose(arpeggio((transpose(echo((X+transpose(X,7) ) ,4,6) ,-7) +transpose(transpose(shuffle(transpose(X,-7) ) ,-7) ,12) ) ) ,-5) ) +transpose((((transpose(X,-5) |transpose(X,-7) ) +transpose(((transpose((X|X) ,-7) +transpose(transpose(X,-5) ,12) ) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose((arpeggio((X|X) ) +(transpose(step(X,12) ,-5) +transpose((transpose((X|X) ,-7) |((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ,12) ) ) ,7) ) ,4) ) ,-7) ,7) ) ,4) +transpose((((step(((((transpose(transpose(X,4) ,4) +step(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose(((X+transpose(step((X+transpose(X,7) ) ,12) ,4) ) +transpose(((X+X) |(X+transpose(X,12) ) ) ,7) ) ,7) ) ,12) ) +transpose(arpeggio(echo(transpose(X,-7) ,4,6) ) ,4) ) +transpose(arpeggio(((transpose(X,4) |transpose(transpose(X,4) ,-7) ) |(echo(X,4,6) |step(X,12) ) ) ) ,7) ) +transpose(transpose(arpeggio(arpeggio(echo(transpose(X,4) ,4,6) ) ) ,-7) ,4) ) ,12) |transpose(((transpose(arpeggio(X) ,-5) +transpose(echo(echo((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(step(X,12) ,12) ) ,4,6) ,4,6) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) +echo(((X+X) +transpose((X+transpose((X|X) ,12) ) ,12) ) ,4,6) ) ,7) ) ,-7) ) +transpose(transpose((echo(transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-5) ,-7) ,4) ,4,6) |transpose((transpose(echo(X,4,6) ,-5) |((step((X|X) ,12) |step((X|X) ,12) ) +(transpose(echo(X,4,6) ,-7) +echo(X,4,6) ) ) ) ,-5) ) ,-7) ,12) ) +transpose((transpose(((transpose(step(X,12) ,-7) +transpose(transpose(step(((transpose(X,4) +transpose(step(arpeggio(X) ,12) ,4) ) +transpose((transpose(X,-5) +transpose((X+X) ,7) ) ,7) ) ,12) ,4) ,4) ) +transpose(step((step(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,12) +((X+transpose(X,12) ) +transpose((transpose(X,-7) +transpose(X,-7) ) ,7) ) ) ,12) ,7) ) ,4) +transpose(shuffle(((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(transpose((transpose(X,4) |((X|X) +transpose(X,7) ) ) ,-5) ,4) ) +transpose((transpose(step(X,12) ,-5) +transpose((transpose(X,-7) |X) ,12) ) ,7) ) +(transpose((step(transpose(X,-7) ,12) +(X+transpose(X,12) ) ) ,-7) |(echo(((X+transpose(X,12) ) +transpose(X,-7) ) ,4,6) |transpose(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,-7) ) ) ) +transpose(((transpose(transpose(X,-5) ,4) +transpose(transpose(((X+X) +transpose((X+transpose(X,12) ) ,12) ) ,-7) ,7) ) |shuffle(transpose(step((X+transpose(X,7) ) ,12) ,-7) ) ) ,-7) ) ) ,7) ) ,7) ) ,12) ) )
random seed used was 0

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