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 20 generations the expression "X" became this:
transpose(transpose(((((((shuffle(transpose((transpose((X+transpose((X+X) ,12) ) ,-7) +(echo(X,4,6) +transpose(transpose(X,-5) ,7) ) ) ,-5) ) +transpose(transpose(transpose((transpose(((X+transpose(X,7) ) +transpose(X,4) ) ,4) +transpose((X|((X+transpose(X,12) ) +transpose(X,12) ) ) ,-7) ) ,-7) ,-7) ,12) ) +transpose(transpose((transpose(echo(transpose((shuffle(X) |(X|X) ) ,-7) ,4,6) ,-7) +transpose((transpose(transpose(transpose((X|X) ,-7) ,-5) ,-5) +transpose((transpose(arpeggio(X) ,-7) +transpose(step(arpeggio(transpose(X,-5) ) ,12) ,12) ) ,12) ) ,7) ) ,4) ,12) ) +transpose((echo(((transpose(((X+transpose(X,12) ) |X) ,-7) |(((((step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,-7) ,4) ) +transpose((((X+transpose(X,7) ) +shuffle(transpose(X,4) ) ) +transpose(((step(X,12) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(X,7) ) ,7) ) ,7) ) |echo((((X+X) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose((shuffle(X) +transpose(echo(X,4,6) ,12) ) ,7) ) ,4,6) ) |(transpose((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(shuffle(transpose(X,-7) ) ,12) ) ,-7) +transpose(shuffle(((transpose((X|X) ,-5) +transpose(step(X,12) ,4) ) +transpose((arpeggio(X) +transpose(transpose(X,-7) ,12) ) ,7) ) ) ,12) ) ) |arpeggio(((X+(X+transpose(X,7) ) ) +transpose((X+transpose(X,12) ) ,7) ) ) ) ) +transpose((transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-5) ,-5) ,-7) |(((((shuffle((transpose(arpeggio((X+X) ) ,4) +transpose(transpose(X,-5) ,12) ) ) +transpose((shuffle(transpose(arpeggio(X) ,4) ) |transpose(transpose(X,-5) ,-7) ) ,4) ) +transpose(((((transpose(X,4) |X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) |(X+transpose(echo(X,4,6) ,12) ) ) ,7) ) |((((X+X) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) |(transpose((X+shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) +transpose(transpose((transpose(X,-7) +transpose(X,7) ) ,-7) ,12) ) ) ) +transpose(((transpose(((arpeggio(transpose(X,-5) ) +transpose((X+X) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ,-5) +echo(((step(X,12) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) ,12) ) |((transpose((X+X) ,4) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) ,4,6) ) |(transpose(X,-7) +step((X+transpose(X,7) ) ,12) ) ) ,7) ) +transpose((((step((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) ,12) +transpose(transpose(X,-5) ,4) ) +transpose((transpose(transpose(((X+X) |X) ,-7) ,-5) |(((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) +transpose((shuffle((X+X) ) +X) ,4) ) +transpose(step((X|X) ,12) ,7) ) ) ,7) ) |arpeggio(((((transpose(X,-7) |X) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) +transpose((X|X) ,4) ) +transpose(((X+(X|X) ) |transpose(arpeggio(step(X,12) ) ,4) ) ,7) ) ) ) ,7) ) ) ,7) ) ,4,6) +transpose(step((((((X|X) +transpose(((X+(X+X) ) +transpose((X+transpose(X,7) ) ,-5) ) ,7) ) +transpose(shuffle(arpeggio(step(X,12) ) ) ,12) ) |transpose(((transpose(X,-5) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ) |transpose(transpose(shuffle(echo((X+transpose(X,4) ) ,4,6) ) ,4) ,-7) ) ,12) ,-5) ) ,12) ) |((transpose(transpose(transpose(step(((transpose(X,4) |X) |echo(shuffle(X) ,4,6) ) ,12) ,4) ,-7) ,4) +transpose(transpose(echo((transpose(step(transpose((X|X) ,-5) ,12) ,-5) +transpose(echo((((X+(X|X) ) +shuffle(X) ) +transpose(X,12) ) ,4,6) ,-7) ) ,4,6) ,-5) ,7) ) |arpeggio(transpose((shuffle(shuffle(transpose(transpose(((X|echo(X,4,6) ) +transpose(X,12) ) ,-7) ,-7) ) ) +transpose(transpose((transpose(transpose((transpose(X,4) +(X+transpose(X,7) ) ) ,-7) ,-7) +transpose(arpeggio((X+(((X+(X+transpose(X,12) ) ) +transpose(transpose(X,4) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ) ) ,7) ) ,4) ,12) ) ,-7) ) ) ) +transpose((transpose(echo(step(((((transpose(((transpose(((X+transpose(X,12) ) |transpose(X,-5) ) ,-5) +transpose(arpeggio(transpose(transpose(X,-5) ,-5) ) ,7) ) +(((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) |(transpose(step(X,12) ,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,-5) +transpose((arpeggio(transpose((X+transpose(X,12) ) ,-7) ) +(((X+transpose(shuffle(X) ,7) ) |shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ) +transpose(((transpose(X,-7) +echo(X,4,6) ) +transpose(X,4) ) ,12) ) ) ,4) ) +((((transpose(X,4) +transpose(step(step(X,12) ,12) ,12) ) +transpose(((X+transpose(echo((X+X) ,4,6) ,7) ) |transpose(X,-7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +step((X|X) ,12) ) ) +transpose(((shuffle(((echo(X,4,6) +transpose((X|X) ,12) ) +transpose(transpose((X|shuffle(X) ) ,4) ,12) ) ) +transpose((transpose(step(X,12) ,-5) +transpose((echo(transpose(transpose((transpose(X,-7) |(X+transpose(X,12) ) ) ,-7) ,4) ,4,6) +echo(step((X|(X|X) ) ,12) ,4,6) ) ,12) ) ,7) ) |transpose(echo((transpose(step(X,12) ,4) +transpose((arpeggio(X) |(X|X) ) ,7) ) ,4,6) ,-7) ) ,4) ) +transpose((step(((transpose(echo((((((echo(X,4,6) +transpose((echo(X,4,6) +transpose((X|X) ,12) ) ,4) ) +transpose((X+X) ,7) ) |arpeggio(X) ) +transpose(transpose((X+X) ,4) ,4) ) +transpose((shuffle(X) +transpose(X,-7) ) ,7) ) ,4,6) ,-7) +transpose(transpose(shuffle((step(shuffle(X) ,12) |(X|shuffle((X|X) ) ) ) ) ,-7) ,4) ) +transpose(transpose(step(((((X+X) +transpose(arpeggio(X) ,12) ) |transpose(X,-5) ) |shuffle(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) ) ) ,12) ,4) ,7) ) ,12) +transpose((((((step(echo(X,4,6) ,12) +transpose(step(X,12) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((transpose((X+transpose(X,12) ) ,-5) +transpose(X,-5) ) ,4) ) +transpose((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) +transpose(transpose((X|X) ,-5) ,12) ) ,7) ) +transpose((((arpeggio(transpose((X+transpose(X,7) ) ,4) ) +transpose((transpose(X,-5) |step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) +echo((transpose(X,-5) +transpose((X|X) ,7) ) ,4,6) ) +echo((X+X) ,4,6) ) ,4) ) ,12) ) ,7) ) ,12) ,4,6) ,4) |((((arpeggio(((((transpose((((X+transpose(echo(X,4,6) ,12) ) +step(X,12) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,-7) +step(step((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ,12) ,12) ) +((shuffle(((step(X,12) +transpose(transpose(X,4) ,4) ) |(echo(X,4,6) +transpose((X|X) ,7) ) ) ) +transpose(shuffle((X|X) ) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,4) ,4) ,7) ) ) |((step(X,12) +transpose(transpose((transpose((X+transpose(X,12) ) ,-7) +transpose(((X+transpose(X,12) ) |X) ,7) ) ,-7) ,4) ) +transpose((transpose(X,-5) |step(step((X+transpose(X,12) ) ,12) ,12) ) ,7) ) ) +transpose((((((((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose((transpose(X,4) +X) ,7) ) ,4) ) +transpose(transpose(transpose(shuffle(X) ,-5) ,-7) ,7) ) +transpose(X,4) ) +transpose(((transpose(X,4) +transpose((X+transpose(X,12) ) ,12) ) +transpose((shuffle(X) |X) ,7) ) ,-5) ) +transpose(transpose(transpose(step(transpose(transpose(transpose(X,-7) ,4) ,4) ,12) ,4) ,-7) ,7) ) ,7) ) ) |transpose(((arpeggio(transpose(step((X+transpose(X,7) ) ,12) ,-5) ) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose(step((transpose(X,-7) +transpose((((X+transpose(X,7) ) +transpose(X,7) ) +transpose(transpose(shuffle(X) ,-7) ,12) ) ,7) ) ,12) ,7) ) ,4) ) +transpose(transpose((transpose(transpose((((transpose(X,-5) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(X,7) ) +transpose(echo(step(transpose(X,-5) ,12) ,4,6) ,7) ) ,-7) ,-5) +transpose(transpose((echo(arpeggio(X) ,4,6) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,-7) ,12) ) ,-7) ,4) ) +transpose((shuffle((shuffle((((((X+X) +transpose(transpose(X,4) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,12) ) +transpose(transpose(transpose((transpose(X,-7) |shuffle(X) ) ,-5) ,-7) ,12) ) +transpose((transpose(shuffle(transpose(X,4) ) ,-5) +(shuffle(transpose(X,-7) ) |transpose(transpose(X,-5) ,-7) ) ) ,7) ) ) +step(transpose(transpose((transpose((X+X) ,-5) |arpeggio(X) ) ,-5) ,4) ,12) ) ) |transpose((((echo(X,4,6) +shuffle(X) ) +(step(X,12) |(X+transpose(X,7) ) ) ) +transpose(((((arpeggio((((X+transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(X,4) ) +transpose((transpose((X|X) ,-5) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(transpose(shuffle(X) ,4) ,12) ) +transpose(((transpose(X,-7) +(X+X) ) +transpose(((X|X) |transpose(transpose(X,-5) ,-5) ) ,12) ) ,-7) ) ,12) ) ,4) ) ,7) ) +transpose(transpose(step((step((transpose((((X+X) |(X+transpose(X,7) ) ) +transpose(shuffle(X) ,12) ) ,-5) +step(arpeggio(((X+X) +transpose(transpose(X,-5) ,7) ) ) ,12) ) ,12) |((((transpose(shuffle(step(X,12) ) ,-5) +((transpose(arpeggio(X) ,-7) +transpose(transpose((echo(X,4,6) +(X+X) ) ,4) ,4) ) +transpose(transpose((transpose(X,-5) |transpose(X,-5) ) ,4) ,7) ) ) +transpose(transpose(((arpeggio(X) +transpose(X,4) ) +transpose((transpose(X,-7) +transpose(echo((X+X) ,4,6) ,7) ) ,7) ) ,-5) ,4) ) +transpose(((transpose((X+X) ,-5) |(transpose(X,-7) +transpose(X,12) ) ) |((transpose(arpeggio(X) ,4) +transpose(((transpose((X+transpose(X,12) ) ,-7) +transpose((transpose(X,4) +X) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ,7) ) |(transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |(transpose(X,-5) +echo(X,4,6) ) ) ,-5) ,-5) |(transpose((((X+X) +transpose(transpose(X,4) ,12) ) |echo(X,4,6) ) ,-7) +transpose(transpose(((X|X) +transpose(X,12) ) ,-5) ,12) ) ) ) ) ,12) ,4) ,4) ) ) ,7) ) +transpose(((arpeggio(transpose(((((transpose(X,4) +(echo(X,4,6) +transpose(X,12) ) ) |step(transpose(X,-5) ,12) ) |shuffle(step(transpose(X,-5) ,12) ) ) +shuffle(transpose(echo(arpeggio(transpose(step(transpose(X,-5) ,12) ,4) ) ,4,6) ,4) ) ) ,4) ) +transpose(transpose(arpeggio(echo(((transpose((X+transpose(X,12) ) ,4) +transpose((transpose((((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(step(X,12) ,12) ) +transpose(shuffle(transpose((arpeggio(X) +transpose(X,12) ) ,-5) ) ,12) ) ,4) +transpose(transpose((X+shuffle(transpose((X+transpose(X,12) ) ,-7) ) ) ,4) ,12) ) ,12) ) +transpose(transpose(arpeggio(((transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) +(arpeggio(X) +X) ) +transpose(shuffle(transpose(transpose(X,-7) ,-5) ) ,4) ) ) ,-5) ,12) ) ,4,6) ) ,-5) ,12) ) +step(shuffle((((((((X+(X+arpeggio(X) ) ) +transpose(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) +transpose((((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +(transpose(X,-7) |arpeggio(X) ) ) ,12) ) +transpose((shuffle(((arpeggio(transpose(X,-7) ) +transpose(((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,12) ) ,4) ) +transpose((((transpose(X,-7) +transpose((X|X) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) +transpose(((shuffle(X) +transpose(X,-5) ) |(X+transpose(transpose(step(X,12) ,4) ,12) ) ) ,12) ) ,7) ) +((transpose(transpose(X,4) ,-7) +transpose(((echo(X,4,6) |echo(X,4,6) ) |((X|(X|X) ) +transpose((X+X) ,4) ) ) ,4) ) +transpose(echo(transpose(arpeggio(X) ,-5) ,4,6) ,7) ) ) +transpose(echo(transpose((transpose(X,-7) +transpose((X|X) ,12) ) ,4) ,4,6) ,7) ) ) ,12) ) ,12) ) ,-5) ,4)
random seed used was 232117193

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