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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Phrase for X:
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After 20 generations the expression "X" became this:
transpose((((transpose(((transpose(((step(transpose(arpeggio(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(arpeggio(transpose(X,4) ) ,-7) ) ) ,4) ,12) +transpose((arpeggio((transpose(shuffle(echo((X+transpose(X,12) ) ,4,6) ) ,-7) +transpose(((transpose(X,4) +transpose(X,-5) ) |(transpose(X,-5) +transpose((X|X) ,12) ) ) ,12) ) ) +transpose(((transpose(transpose(transpose(X,-7) ,4) ,-5) |((X+X) |echo(X,4,6) ) ) +transpose(transpose(transpose(echo(X,4,6) ,-5) ,4) ,7) ) ,4) ) ,12) ) |((((shuffle(((X+X) +X) ) +transpose(transpose(shuffle(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) ,7) ) +transpose(transpose(transpose(transpose((X|X) ,4) ,-7) ,-7) ,4) ) +transpose((((((transpose(transpose(X,-5) ,-7) +transpose((X|(X+transpose(X,12) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +(X+transpose(X,-7) ) ) +transpose((((X|X) +transpose((X+transpose(X,7) ) ,7) ) |((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) |transpose(X,-5) ) ,7) ) +transpose(((transpose(transpose(X,-7) ,-7) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ) ,-5) |echo(transpose(transpose((echo((arpeggio((X|X) ) +transpose(arpeggio(X) ,12) ) ,4,6) +transpose(((arpeggio((transpose(X,-5) +(X+transpose(X,12) ) ) ) +transpose(echo((((((X|X) +transpose(transpose((X|X) ,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose((X+transpose(echo(X,4,6) ,7) ) ,-5) ,7) ) ,4,6) ,4) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,12) ) ,-5) ,4) ,4,6) ) +transpose(transpose((echo(transpose(transpose((step(step(step(X,12) ,12) ,12) |(((((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) +((((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +transpose(((X|X) |step(X,12) ) ,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ) +transpose(echo(step(step(X,12) ,12) ,4,6) ,7) ) +transpose(transpose(transpose(arpeggio(X) ,-7) ,4) ,7) ) ) ,-7) ,4) ,4,6) +transpose((arpeggio(((transpose((((transpose(((X+transpose(X,7) ) |(X|X) ) ,-5) +transpose(transpose(transpose(X,4) ,-7) ,7) ) +transpose(X,4) ) +transpose((transpose(X,-5) |(transpose(X,-5) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) ) ,7) ) ,-7) |transpose(transpose(transpose((X|X) ,4) ,-5) ,-7) ) +transpose(arpeggio(((transpose(arpeggio(X) ,-5) +transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,12) ) ) +transpose(((echo(transpose(((arpeggio(X) +transpose(transpose(X,-5) ,12) ) |transpose(arpeggio(X) ,4) ) ,4) ,4,6) +transpose(shuffle(((arpeggio(step((transpose(transpose(X,-5) ,-5) +transpose(echo(X,4,6) ,7) ) ,12) ) +(transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(shuffle(X) ,4) ) +transpose((arpeggio(X) |transpose(X,-5) ) ,7) ) ,-7) +step((transpose(X,4) |arpeggio(transpose(X,4) ) ) ,12) ) ) |transpose(arpeggio(step(transpose(transpose(X,-7) ,-7) ,12) ) ,4) ) ) ,4) ) +transpose(((step(transpose(transpose((transpose(X,-5) |X) ,4) ,-7) ,12) +transpose(arpeggio((transpose((transpose((transpose(shuffle(X) ,-5) +(transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) +transpose((arpeggio(X) +transpose(transpose(transpose(X,-5) ,4) ,12) ) ,12) ) ,-5) +transpose(transpose(transpose(((X|(X|X) ) |transpose((X+transpose(X,7) ) ,-5) ) ,4) ,4) ,7) ) ) ,4) ) +transpose(shuffle(transpose(transpose(step((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(X,-7) ) ,12) ,-5) ,4) ) ,7) ) ,7) ) ,7) ) ,12) ) ,-7) ,12) ) ,-7) +transpose(step(step(transpose(transpose(shuffle(transpose(((transpose(step((arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) ,12) ,4) |(X|echo(X,4,6) ) ) +transpose((((X+transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,12) ) ,4) ) ,-7) ,4) ,12) ,12) ,12) ) +transpose((arpeggio(echo((transpose(transpose((transpose(transpose(transpose(echo(X,4,6) ,-5) ,-5) ,4) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,4) ,7) ) ,4) ,-7) +transpose(echo(step(shuffle(echo(transpose(arpeggio((X+transpose(X,12) ) ) ,4) ,4,6) ) ,12) ,4,6) ,12) ) ,4,6) ) |((arpeggio(((echo(transpose(((((step(step((transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ,4) |(((transpose(X,-5) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) |(shuffle(X) |(X+transpose(X,12) ) ) ) +(transpose(X,4) +transpose(((step(X,12) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(X,7) ) ,7) ) ) ) ,12) ,12) +step(echo(transpose((((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ,4,6) ,12) ) +transpose(transpose(arpeggio(step((((((X|X) +transpose(X,12) ) |echo(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) ,4,6) ) +transpose((transpose(arpeggio(X) ,4) +transpose(arpeggio(transpose(transpose(X,4) ,-7) ) ,12) ) ,4) ) +transpose(((transpose(transpose(transpose(X,-7) ,4) ,4) +transpose(X,4) ) +transpose((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,7) ) ,12) ) ,4) ,4) ) +transpose(transpose((step((transpose((X|X) ,-7) +transpose(transpose(X,4) ,12) ) ,12) +transpose(transpose((step((X|X) ,12) +transpose(((shuffle(X) +transpose(transpose(X,-5) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ,-7) ,12) ) ,4) ,7) ) +transpose(arpeggio(transpose(echo(transpose(((X|arpeggio(X) ) +transpose(X,7) ) ,-7) ,4,6) ,4) ) ,7) ) ,4) ,4,6) +transpose(transpose(echo((((shuffle(((((X+transpose(X,12) ) |transpose(X,-7) ) +transpose(echo(X,4,6) ,12) ) +((X|X) |X) ) ) |transpose(arpeggio(transpose(X,4) ) ,-5) ) +transpose(((step(transpose(transpose(X,4) ,-5) ,12) +transpose(transpose((transpose(X,-7) |(X+transpose(X,7) ) ) ,-7) ,7) ) |((transpose((X+X) ,-5) +((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ) |transpose(shuffle(echo(X,4,6) ) ,-5) ) ) ,7) ) +transpose(arpeggio((((transpose(step(X,12) ,4) +transpose(arpeggio(transpose(X,-5) ) ,12) ) +transpose(((X|X) +X) ,7) ) |((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ) ) ,12) ) ,4,6) ,4) ,4) ) +transpose(transpose(((transpose(X,4) |transpose((X|arpeggio(X) ) ,-5) ) +transpose(arpeggio((shuffle(X) +(X+(X|X) ) ) ) ,12) ) ,-5) ,7) ) ) +transpose((shuffle(shuffle(step(shuffle((X+transpose(X,7) ) ) ,12) ) ) |transpose((transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ,-5) +transpose((echo(X,4,6) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,12) ) ,4) ) ,4) ) +transpose(step((((((step(((arpeggio(((((X|X) +transpose((X+transpose(X,7) ) ,12) ) |((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose((step(X,12) |X) ,7) ) ) +(transpose(transpose(X,4) ,4) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ) ) +transpose(transpose((X|X) ,4) ,4) ) +transpose(transpose(((transpose(transpose(X,4) ,4) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,-7) ,7) ) ,12) +transpose(transpose(((((((X+X) +transpose(X,7) ) |(transpose(X,-7) |step(X,12) ) ) +transpose((X|X) ,-5) ) |transpose((echo(X,4,6) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose(shuffle(transpose((arpeggio(X) +transpose(transpose(X,-5) ,12) ) ,-7) ) ,7) ) ,4) ,4) ) +transpose(arpeggio(transpose(transpose(X,-5) ,4) ) ,7) ) |transpose(arpeggio(((echo(transpose(transpose(transpose(X,4) ,-5) ,4) ,4,6) |(((shuffle(transpose(X,-7) ) +transpose(step(transpose((X+transpose(X,12) ) ,4) ,12) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(((((X+transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) +transpose(((X+transpose(X,7) ) |X) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose((transpose(X,-5) +transpose(transpose(shuffle(X) ,4) ,7) ) ,7) ) ,7) ) ) +transpose(transpose(shuffle((transpose(transpose(X,4) ,-7) +transpose(shuffle(X) ,7) ) ) ,4) ,12) ) ) ,-5) ) +transpose(step(transpose(transpose(((((transpose(transpose(X,-7) ,-7) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((arpeggio((X|X) ) |transpose(shuffle((X+transpose(X,7) ) ) ,-5) ) ,12) ) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(echo((transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,-5) |(X|(X+X) ) ) ,4,6) ,7) ) ,-5) ,-7) ,12) ,4) ) +transpose(transpose((shuffle(echo(transpose(((transpose(step(X,12) ,-5) +transpose((transpose(shuffle((X|X) ) ,-7) +echo((X+X) ,4,6) ) ,4) ) +transpose(transpose(((X+X) |transpose(shuffle(X) ,-5) ) ,4) ,7) ) ,4) ,4,6) ) |(transpose(echo((arpeggio(((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) +transpose(transpose(transpose(((X+X) +transpose((X+transpose(X,12) ) ,12) ) ,-7) ,-7) ,12) ) ,4,6) ,-7) +transpose(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((transpose(X,-5) |echo((X+transpose(transpose(X,4) ,12) ) ,4,6) ) ,12) ) |((((((X+transpose(X,12) ) +transpose(shuffle((X+transpose(X,12) ) ) ,12) ) |(transpose((X+transpose(X,12) ) ,-7) |transpose(transpose(X,-5) ,-7) ) ) +transpose((arpeggio(X) +transpose(transpose((X+X) ,-5) ,12) ) ,12) ) +transpose(((transpose(transpose(X,4) ,4) +transpose((arpeggio((X+transpose(X,12) ) ) +transpose(X,7) ) ,4) ) +transpose((transpose(X,-7) |transpose(X,-5) ) ,7) ) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ) ,12) ,7) ) ) ,4) ,7) ) ,12) ,7) ) ) ,4) ) +transpose(transpose((arpeggio(echo(transpose(transpose(transpose(transpose(((X+transpose(X,12) ) +X) ,4) ,-5) ,-7) ,-5) ,4,6) ) |echo((((arpeggio(X) +transpose(X,12) ) +transpose((((X+transpose(X,12) ) +transpose((transpose(X,4) +transpose(shuffle(X) ,7) ) ,12) ) +transpose(((echo(X,4,6) +transpose(X,7) ) +transpose(transpose(transpose(transpose(arpeggio(X) ,4) ,4) ,-7) ,12) ) ,7) ) ,12) ) |transpose((((transpose(X,-5) +transpose((shuffle(X) +(X+X) ) ,4) ) +transpose(X,7) ) +((transpose(X,-5) +transpose(echo(echo(X,4,6) ,4,6) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ) ,-7) ) ,4,6) ) ,4) ,7) ) ,4)
random seed used was 230638792

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