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 12 generations the expression "X" became this:
(transpose(step(((shuffle((echo((X+transpose(X,12) ) ,4,6) +shuffle(X) ) ) |transpose(transpose(((transpose(X,4) +transpose(step(X,12) ,7) ) +transpose(transpose(X,4) ,7) ) ,-7) ,4) ) +((((transpose(((shuffle(X) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) ,-5) +transpose(transpose(arpeggio((X|transpose(X,-7) ) ) ,-5) ,7) ) +transpose(arpeggio(transpose(step((X+arpeggio(X) ) ,12) ,4) ) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) +transpose(step((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,12) ,7) ) ) ,12) ,4) +transpose(((transpose(transpose((echo(shuffle((X+X) ) ,4,6) +(transpose(((X+X) +transpose(X,7) ) ,-5) +transpose(shuffle(transpose(X,-7) ) ,7) ) ) ,-7) ,-7) +transpose(transpose((((X+transpose((X+X) ,7) ) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose(X,4) ,-7) ) ,-7) ,4) ) +transpose(((step(((transpose(shuffle((transpose((X+X) ,4) |(shuffle(X) |(X+X) ) ) ) ,4) |(transpose(transpose(transpose(X,-5) ,-5) ,-5) +transpose((shuffle(X) |(echo(X,4,6) +transpose(transpose(X,-7) ,12) ) ) ,12) ) ) +(transpose((shuffle(transpose(arpeggio(X) ,-7) ) +transpose((transpose((X|X) ,-5) +transpose(((X+transpose(X,12) ) |(X+transpose(X,7) ) ) ,7) ) ,7) ) ,4) |arpeggio(arpeggio((X|X) ) ) ) ) ,12) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose(transpose(transpose(((arpeggio(X) |transpose(X,-5) ) +step(X,12) ) ,-5) ,4) ,7) ) ,4) ) +transpose(transpose((transpose(transpose(((X+transpose(X,12) ) +transpose(((X+transpose(X,12) ) |(X|X) ) ,7) ) ,-5) ,-7) |(transpose(((transpose(X,4) +transpose(transpose(X,-7) ,7) ) +transpose((X|X) ,7) ) ,4) |((((transpose(X,-7) +transpose(step((X+X) ,12) ,12) ) +transpose(step(arpeggio(step(X,12) ) ,12) ,4) ) +transpose((X+transpose((echo(X,4,6) +transpose(X,-5) ) ,7) ) ,7) ) |transpose(transpose((transpose(X,4) +X) ,-7) ,4) ) ) ) ,-7) ,7) ) ,7) ) ,12) )
random seed used was 137986649 EXPR = ((((transpose(shuffle((transpose(transpose(transpose(X,-5) ,-7) ,-7) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +(X+transpose(X,12) ) ) ,-5) ,4) ) ) ,4) +transpose((((arpeggio(((X|(X|X) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,12) ) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +(((X|(X+X) ) +transpose(((X+transpose(X,12) ) +(X|X) ) ,7) ) |((echo(X,4,6) |(X+transpose(X,12) ) ) +transpose(((X+transpose(shuffle(X) ,7) ) +arpeggio(X) ) ,12) ) ) ) +transpose((((transpose((((arpeggio((X+transpose(X,12) ) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(echo(X,4,6) ,-5) ) ,7) ) ,-7) +transpose(transpose(transpose(((((X|X) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ,-7) ,4) ) +transpose(transpose(transpose((X+((step(X,12) +transpose(X,4) ) +transpose((X|X) ,7) ) ) ,-5) ,-7) ,7) ) +(transpose(arpeggio(step(X,12) ) ,-5) +transpose(transpose(step(X,12) ,-5) ,4) ) ) ,12) ) ,4) ) +transpose(arpeggio((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,4) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) ) ,-5) |(((X+transpose((X|X) ,7) ) +transpose(((step(X,12) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(X,7) ) ) ,7) ) ) ,7) ) +transpose((transpose((((((transpose(X,4) +transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose((transpose((X|X) ,-5) +transpose((((X+transpose(arpeggio(X) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((transpose(X,4) |transpose(X,-5) ) ,7) ) ,7) ) ,12) ) +transpose(((((X|(X+transpose(X,7) ) ) +transpose(X,-5) ) |echo((X+arpeggio(X) ) ,4,6) ) +transpose((transpose((transpose(X,-5) +transpose((X|X) ,12) ) ,-5) +transpose((shuffle(X) +transpose(X,12) ) ,-7) ) ,7) ) ,7) ) +transpose((transpose((transpose(X,-7) +transpose(transpose(X,4) ,-5) ) ,-7) |(shuffle(transpose((X+X) ,4) ) +transpose((transpose(X,4) +arpeggio(shuffle(echo(X,4,6) ) ) ) ,7) ) ) ,7) ) ,-7) +(((transpose(shuffle((X+transpose(X,12) ) ) ,-5) |(step(X,12) |(((X+transpose(X,7) ) +transpose(X,7) ) +transpose(arpeggio((X+X) ) ,7) ) ) ) +((X+transpose(X,7) ) +transpose(transpose(((X+transpose(X,12) ) |X) ,-5) ,12) ) ) |((transpose(transpose((step(X,12) +transpose(transpose(X,4) ,12) ) ,-5) ,-7) +transpose((step(transpose((shuffle(X) +transpose((transpose(X,-5) |transpose(X,-7) ) ,12) ) ,-5) ,12) +transpose((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) ,7) ) ,4) ) +transpose(transpose((echo(arpeggio(step(X,12) ) ,4,6) +echo(shuffle(transpose(X,4) ) ,4,6) ) ,-5) ,7) ) ) ) ,4) ) +transpose((((((((shuffle(X) +transpose(transpose(shuffle(X) ,-5) ,12) ) +(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) +(transpose(transpose(transpose(X,-7) ,-5) ,-7) +transpose(transpose(transpose(echo((X+X) ,4,6) ,-5) ,-7) ,7) ) ) +transpose(transpose((((X+X) +transpose(transpose(echo(X,4,6) ,4) ,-5) ) |step((((X|X) +transpose(shuffle(X) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,4) ) ,7) ) ,12) ) ,-7) ,4) ) +transpose((((transpose(step((X+X) ,12) ,-5) +(transpose(transpose(X,4) ,-7) +transpose((step((X+transpose(X,7) ) ,12) +shuffle((X+X) ) ) ,7) ) ) +transpose((shuffle(transpose(((X|X) |transpose(X,4) ) ,-7) ) |transpose(((X|X) |arpeggio(X) ) ,-7) ) ,4) ) +transpose(shuffle((shuffle(X) +X) ) ,7) ) ,-5) ) |transpose(((transpose(transpose((X+X) ,-7) ,-5) |transpose((arpeggio(X) +transpose(X,12) ) ,4) ) +transpose(((transpose(X,-5) +transpose((X+X) ,7) ) +(step(transpose(X,-7) ,12) +((X|X) +transpose((X|X) ,7) ) ) ) ,7) ) ,-7) ) ,7) )
random seed used was 0 EXPR = ((transpose((transpose(((X+(X+transpose(X,12) ) ) |(((X|transpose(X,-7) ) +transpose(arpeggio(X) ,4) ) +transpose(step((X+X) ,12) ,7) ) ) ,4) +arpeggio(X) ) ,4) +transpose(transpose((transpose(transpose(((shuffle((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ,7) ) ) |transpose(transpose(X,4) ,-5) ) |arpeggio(transpose(step(X,12) ,4) ) ) ,4) ,-7) +transpose(echo(((transpose(shuffle(arpeggio(X) ) ,-7) +transpose((transpose(X,-7) |(X+X) ) ,4) ) +transpose((step((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,12) +transpose(((transpose(transpose(X,4) ,-7) +X) +(((X|X) +transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) ,7) ) ,4,6) ,7) ) ,-5) ,4) ) +transpose(arpeggio(transpose((transpose(transpose(transpose(step(((X+X) +transpose(X,-5) ) ,12) ,-7) ,4) ,-7) +transpose((((transpose(step((X+transpose(X,12) ) ,12) ,-7) +transpose((shuffle((X+X) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,7) ) +transpose((shuffle(transpose(X,4) ) +transpose(transpose(echo(transpose(X,-7) ,4,6) ,4) ,12) ) ,4) ) +transpose((((transpose(X,4) +(X+transpose(X,12) ) ) +(shuffle(X) +shuffle(transpose(X,4) ) ) ) +transpose(((transpose(X,-5) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ) ,7) ) ,7) ) ,-7) ) ,7) )
random seed used was 0 EXPR = (transpose(echo((transpose(transpose(step(((transpose(X,4) |X) |((transpose(X,-7) +transpose(((X+X) +X) ,4) ) +transpose((transpose(X,-5) |transpose(X,4) ) ,7) ) ) ,12) ,-7) ,4) +shuffle((shuffle(transpose((X+X) ,-7) ) +transpose(shuffle((echo(X,4,6) +transpose(((X+transpose(X,12) ) |X) ,12) ) ) ,12) ) ) ) ,4,6) ,4) +((arpeggio((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) ) ) |((transpose((step(X,12) +transpose(((X+transpose(X,12) ) |transpose(X,-5) ) ,12) ) ,4) +transpose(transpose(echo(transpose(X,4) ,4,6) ,-5) ,12) ) +transpose((transpose((transpose(X,-7) +X) ,-5) +transpose(transpose(((X|X) |transpose(X,4) ) ,-7) ,12) ) ,12) ) ) |((transpose((((X+transpose(X,7) ) +transpose(transpose(transpose(((X+X) |X) ,-5) ,4) ,7) ) +transpose(transpose(((transpose(X,-7) +X) +(arpeggio(X) +transpose(X,12) ) ) ,-7) ,12) ) ,-5) +arpeggio((transpose(transpose(X,-7) ,-5) +transpose((transpose(X,-5) +(X+transpose(X,12) ) ) ,12) ) ) ) |(transpose(arpeggio(transpose((transpose(X,4) +(((shuffle(X) +transpose(X,7) ) +transpose((((X+X) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((transpose(X,-7) +step(X,12) ) ,7) ) ) ,-5) ) ,-5) +(transpose(((step(transpose(X,4) ,12) +(transpose(X,-5) |(X+transpose(X,12) ) ) ) +transpose((X+transpose(X,12) ) ,12) ) ,-5) +transpose(((transpose(echo(X,4,6) ,4) +transpose(arpeggio(transpose(step(transpose(X,4) ,12) ,4) ) ,7) ) +transpose((transpose(transpose(transpose(X,-7) ,4) ,-5) |echo(X,4,6) ) ,7) ) ,12) ) ) ) ) )
random seed used was 0

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