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(((step(step(arpeggio(echo((transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ,-7) +(echo(((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ,4,6) |X) ) ,4,6) ) ,12) ,12) +transpose((transpose((((((echo(transpose(transpose(X,4) ,4) ,4,6) +transpose(((X+(X|X) ) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ,4) ) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,-7) ,7) ) +transpose(((echo(X,4,6) +transpose(step(arpeggio(X) ,12) ,7) ) +transpose((X+transpose(X,12) ) ,-7) ) ,12) ) +transpose(((((X+transpose(X,12) ) +transpose(step(X,12) ,12) ) +transpose(X,4) ) +transpose((((X+transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) ,7) ) +arpeggio(transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ) ) ,-5) |((echo(transpose(((X+transpose(X,7) ) +transpose(step(X,12) ,7) ) ,4) ,4,6) |(transpose(transpose(transpose((step((X+transpose(X,7) ) ,12) +transpose(arpeggio((X+transpose(X,7) ) ) ,12) ) ,-5) ,4) ,4) +transpose(transpose((step(X,12) |step((X|X) ,12) ) ,4) ,7) ) ) +echo(step(transpose(X,-7) ,12) ,4,6) ) ) ,7) ) |((arpeggio(X) +(echo(transpose(X,-5) ,4,6) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ) ) |transpose((transpose(((X|X) |transpose(X,-7) ) ,-5) +transpose(transpose(shuffle(X) ,-5) ,12) ) ,-7) ) ) ,4,6) ,4)
random seed used was 18 EXPR = (((((echo(((X+((X+transpose(X,4) ) +transpose(X,7) ) ) |transpose((((X|X) +transpose((X|X) ,12) ) |transpose(X,-5) ) ,4) ) ,4,6) +transpose(transpose(step((X|X) ,12) ,4) ,4) ) +transpose(arpeggio((echo(X,4,6) +X) ) ,7) ) +echo((arpeggio(echo(transpose(((arpeggio(X) |(X|X) ) +transpose(((X+transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,4) ,4,6) ) +(((transpose((shuffle(X) +transpose(X,12) ) ,-7) +transpose((transpose(((transpose(X,-7) +transpose((X+X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) +transpose(((X+X) |((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) ,4) ) +transpose(shuffle(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ) ,7) ) +(transpose(((X|X) |(X+transpose(shuffle(X) ,7) ) ) ,4) |(X+transpose(transpose(X,4) ,7) ) ) ) ) ,4,6) ) +transpose(echo((transpose(((transpose((shuffle((X+transpose(X,7) ) ) +transpose((transpose(X,-7) |(X+transpose(X,7) ) ) ,7) ) ,-5) |(shuffle((X|X) ) +transpose(echo(((X+X) +X) ,4,6) ,12) ) ) |transpose((arpeggio((X|(X+X) ) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) ,-7) ) ,-7) +arpeggio(transpose(transpose(((X+X) +X) ,4) ,-5) ) ) ,4,6) ,4) ) +transpose(transpose(transpose(((shuffle(((((transpose((X+X) ,4) +transpose(shuffle(transpose(X,-5) ) ,12) ) +(transpose(transpose((X+X) ,4) ,-7) +transpose(transpose(transpose((X+X) ,4) ,-7) ,12) ) ) +transpose((X+X) ,4) ) +transpose(arpeggio(((X+transpose(X,7) ) +(transpose(X,-5) |((X+transpose((X+X) ,4) ) +transpose(X,7) ) ) ) ) ,7) ) ) |transpose((((((X|echo(X,4,6) ) +transpose(transpose(transpose((X|X) ,-5) ,-7) ,4) ) +transpose(transpose(((X+X) |X) ,-7) ,7) ) +transpose(arpeggio(echo(transpose((X|X) ,4) ,4,6) ) ,12) ) |shuffle(echo((((echo(transpose(X,-7) ,4,6) |arpeggio(X) ) |((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ) |transpose((X+transpose(X,7) ) ,-7) ) ,4,6) ) ) ,4) ) |transpose(transpose(transpose((step(((shuffle(shuffle(X) ) +transpose(step(X,12) ,12) ) |transpose(X,-7) ) ,12) |step(X,12) ) ,-7) ,-7) ,-7) ) ,-5) ,-7) ,7) )
random seed used was 0 EXPR = (((((transpose((transpose(((transpose(X,-7) +(X|X) ) +transpose((arpeggio((echo(X,4,6) +(X+transpose(X,12) ) ) ) +transpose((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ,7) ) ,4) +transpose((X+X) ,4) ) ,-7) +transpose((((((((transpose(X,-5) +step(transpose(X,-7) ,12) ) +arpeggio(X) ) +transpose((transpose(transpose((X+transpose(X,12) ) ,-7) ,4) +(echo(X,4,6) +(((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ) ,7) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |X) ,4) ) +transpose(transpose(((step(X,12) |((X+X) |transpose(X,4) ) ) +transpose(arpeggio(echo(echo(X,4,6) ,4,6) ) ,12) ) ,4) ,7) ) |(((transpose(step(X,12) ,-7) +transpose(shuffle(X) ,4) ) +transpose(step((echo(X,4,6) +(X+X) ) ,12) ,7) ) +transpose((X+echo(transpose(X,-5) ,4,6) ) ,12) ) ) |transpose(transpose(transpose(arpeggio(((X+(X+X) ) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ) ,4) ,-5) ,-5) ) ,4) ) +transpose((transpose((echo(arpeggio(X) ,4,6) +(step(shuffle(X) ,12) |transpose((X+transpose(X,7) ) ,4) ) ) ,-7) |arpeggio(((X+transpose(X,12) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ) ) ,7) ) |echo(transpose(transpose((((((shuffle(transpose(X,-5) ) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose(echo((shuffle(X) +transpose(X,12) ) ,4,6) ,7) ) +transpose(echo(((X+X) +transpose(transpose((transpose(X,-5) +transpose(X,7) ) ,4) ,7) ) ,4,6) ,12) ) +transpose(transpose(((X+(X+transpose(X,12) ) ) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ,4) ) +transpose(((transpose(shuffle(X) ,-7) +transpose(((transpose((X+X) ,4) +transpose(transpose(X,-5) ,12) ) |((transpose((X|X) ,4) |(X+X) ) +echo(transpose(X,-7) ,4,6) ) ) ,4) ) +transpose(transpose(arpeggio(transpose(X,-5) ) ,-7) ,7) ) ,7) ) ,-5) ,-5) ,4,6) ) +transpose((step(((transpose(transpose(transpose(step((transpose(transpose((X|X) ,-7) ,-7) |transpose(transpose(X,-7) ,-5) ) ,12) ,-7) ,4) ,4) +transpose(transpose(transpose(step(((transpose((shuffle(X) |transpose(X,-5) ) ,-5) +transpose(arpeggio((X+transpose(shuffle(X) ,7) ) ) ,4) ) +transpose(step(X,12) ,7) ) ,12) ,-7) ,4) ,12) ) |arpeggio((echo(transpose(X,-5) ,4,6) +transpose(((X|X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,4) ) |X) ,12) ) ,-5) ) ) ) ,12) +transpose(shuffle(transpose((transpose(transpose(transpose(shuffle(X) ,-7) ,4) ,4) +transpose(echo(transpose(shuffle(transpose(transpose(step(((arpeggio(X) |(X+X) ) |(transpose(X,-7) +(X+transpose(X,7) ) ) ) ,12) ,-5) ,4) ) ,4) ,4,6) ,12) ) ,4) ) ,12) ) ,4) ) +transpose(transpose(echo(((step((echo(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) ,4,6) |((step(transpose(X,4) ,12) +transpose(step(X,12) ,7) ) +transpose(((X+X) +transpose(transpose(X,-7) ,4) ) ,7) ) ) ,12) +transpose(transpose(((arpeggio(((transpose(X,4) +(X+transpose((X+transpose(X,7) ) ,12) ) ) |(transpose(X,4) +transpose((X|X) ,12) ) ) ) +transpose(transpose(transpose(transpose(shuffle(arpeggio(X) ) ,-5) ,-7) ,4) ,4) ) +transpose(((((X+X) +transpose(transpose(X,4) ,12) ) +transpose(transpose(X,-5) ,12) ) |((((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,12) ) |transpose(X,-5) ) ,7) ) +transpose(transpose((((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X+X) ,7) ) ,-7) ,4) ) +transpose(arpeggio(transpose(transpose((X+X) ,-7) ,-5) ) ,7) ) ) ,7) ) ,-7) ,12) ) |transpose((transpose(transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,4) +transpose((((X+transpose((X+X) ,4) ) +transpose(X,7) ) +transpose((X|(X|X) ) ,7) ) ,12) ) ,4) ) ,4,6) ,4) ,7) )
random seed used was 0 EXPR = transpose(transpose(((transpose(transpose(((transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) +transpose((transpose(X,-5) +arpeggio(X) ) ,4) ) |shuffle(transpose(transpose(X,-5) ,-5) ) ) ,4) ,-7) +echo((transpose(arpeggio(transpose(transpose(X,4) ,4) ) ,-5) +transpose((echo((((X+X) |transpose(X,-5) ) +((X+X) +transpose(arpeggio(X) ,7) ) ) ,4,6) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,7) ) ,7) ) ,4,6) ) |((((((X|X) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) |transpose(echo(X,4,6) ,4) ) |transpose((transpose(X,4) |((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,-7) ) +transpose((transpose(transpose(shuffle((X+X) ) ,-5) ,4) +transpose(((((echo(transpose(transpose(X,-5) ,-7) ,4,6) +arpeggio((echo(X,4,6) |transpose(echo(X,4,6) ,-5) ) ) ) +(((transpose(transpose(X,4) ,-7) +transpose(transpose(step(X,12) ,-5) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) +transpose(transpose(X,4) ,7) ) ) |transpose(transpose(arpeggio((shuffle(X) +X) ) ,-7) ,4) ) +transpose(arpeggio((transpose((X|X) ,-7) +echo((((X|X) +transpose(((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ,4) ) +transpose(((arpeggio(echo(X,4,6) ) +transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4,6) ) ) ,12) ) ,7) ) ,7) ) ) ,4) ,-5)
random seed used was 0

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