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 18 generations the expression "X" became this:
((transpose(transpose(step(arpeggio(shuffle(((((transpose((X+transpose(X,7) ) ,-5) +(transpose(shuffle(transpose(X,-7) ) ,4) +transpose(transpose(X,-7) ,-7) ) ) +transpose(transpose((step((((X+transpose(X,12) ) |(X+X) ) |X) ,12) +echo(step(transpose(X,-7) ,12) ,4,6) ) ,-5) ,4) ) +transpose((transpose(((X+X) |step(X,12) ) ,-5) |arpeggio((step(echo(X,4,6) ,12) +X) ) ) ,7) ) +transpose(shuffle(transpose((arpeggio(transpose(transpose(X,4) ,4) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,7) ) ,-7) ) ,12) ) ) ) ,12) ,4) ,-5) +transpose(transpose(((((transpose(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +((arpeggio((transpose(transpose(X,-5) ,4) +transpose((echo(X,4,6) +transpose(X,7) ) ,12) ) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) ,-5) |(transpose((arpeggio(echo((echo(X,4,6) +transpose(X,4) ) ,4,6) ) +transpose((transpose(transpose(transpose(X,4) ,-7) ,4) +transpose((X+X) ,-5) ) ,7) ) ,-5) +transpose((step(transpose(transpose(step(X,12) ,-7) ,4) ,12) +transpose((((X|X) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) |(X|X) ) ,4) ) ,12) ) ) |(transpose(echo((transpose((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) |(((transpose(arpeggio(X) ,-5) +transpose((X+X) ,4) ) +transpose(((echo(X,4,6) |X) |X) ,7) ) +(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) ) ,4,6) ,4) +transpose(transpose((echo((shuffle(transpose(X,-5) ) |transpose(transpose(X,-5) ,4) ) ,4,6) +transpose(transpose(transpose(transpose(X,-5) ,4) ,4) ,-5) ) ,-7) ,-5) ) ) +(((((shuffle((transpose((((X|X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) +transpose(arpeggio(((step(transpose(X,-7) ,12) +step(transpose(X,-5) ,12) ) |X) ) ,12) ) ) +((X+transpose(X,12) ) +transpose(X,12) ) ) |(((transpose(((step((X+transpose(X,12) ) ,12) +transpose(arpeggio(transpose(transpose(X,-5) ,-7) ) ,4) ) +transpose(((X|X) +transpose(transpose((X|X) ,4) ,7) ) ,7) ) ,-5) |((((arpeggio(step(X,12) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) +((X+transpose(((X+transpose(X,12) ) +transpose(step(X,12) ,12) ) ,12) ) +((X+transpose(X,7) ) +(X+transpose(X,12) ) ) ) ) +transpose(echo((transpose(X,4) +transpose((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,7) ) ) |((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) |X) +transpose(arpeggio(transpose(X,4) ) ,7) ) +transpose(transpose((((transpose(X,4) |(step(X,12) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose(shuffle(step((X+X) ,12) ) ,7) ) ,-7) ,7) ) ) |((transpose(transpose(transpose(X,-5) ,-5) ,4) +transpose(transpose((X+transpose(transpose(X,-7) ,12) ) ,4) ,12) ) +transpose(arpeggio(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) ) ) +transpose(echo(echo(step((echo(step(transpose(transpose(X,4) ,-7) ,12) ,4,6) |shuffle(arpeggio(transpose(X,-5) ) ) ) ,12) ,4,6) ,4,6) ,7) ) +transpose(echo(((transpose(((transpose((transpose(X,4) +transpose(echo(X,4,6) ,7) ) ,4) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose((transpose(echo(X,4,6) ,4) +X) ,7) ) ,4) +transpose(transpose(transpose((X+transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4) ,12) ) ,4) ,-5) ,7) ) |((transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,-7) +transpose(transpose(X,-7) ,4) ) +transpose((((((transpose(X,4) +transpose(X,7) ) +transpose((transpose(X,-7) |(X+transpose(X,12) ) ) ,4) ) +transpose((transpose(X,-5) |X) ,7) ) +(((X|X) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose(echo(transpose(X,-5) ,4,6) ,-5) ) ,-7) ) ) ,4,6) ,4) ) +transpose((((echo(shuffle((((((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) +(X+transpose(X,-5) ) ) +transpose((X+X) ,7) ) +(step(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,12) +transpose(step(X,12) ,-5) ) ) ) ,4,6) +((arpeggio(transpose(X,-7) ) +transpose(arpeggio(transpose((transpose(X,4) +transpose(step(X,12) ,7) ) ,-5) ) ,-7) ) +transpose(transpose(transpose(((((X|shuffle(transpose(X,-7) ) ) +(shuffle((X+transpose(X,7) ) ) +transpose((X+transpose(step(X,12) ,12) ) ,12) ) ) |((((step(X,12) +X) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) |((X+transpose((X+X) ,4) ) +transpose(X,7) ) ) ) +transpose(step((transpose(X,4) +X) ,12) ,-7) ) ,-7) ,-7) ,7) ) ) +transpose((echo(((transpose(step((X|X) ,12) ,-5) |(transpose(X,-7) |transpose(X,4) ) ) |((transpose(X,4) |(((X+transpose(X,12) ) +transpose(arpeggio(X) ,7) ) |((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ) +transpose(shuffle(step(X,12) ) ,12) ) ) ,4,6) +(transpose((transpose(X,4) +X) ,4) |(arpeggio(X) |(X+X) ) ) ) ,4) ) +transpose((transpose(arpeggio(((transpose(transpose(transpose(((X+X) +transpose(echo(X,4,6) ,12) ) ,-7) ,-7) ,-5) +transpose(((echo(step(X,12) ,4,6) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose((X+((X+X) +X) ) ,7) ) ,7) ) +transpose(arpeggio(step((((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) +(transpose(X,4) +transpose(X,12) ) ) |transpose(step(X,12) ,-5) ) ,12) ) ,12) ) ) ,4) |(step(transpose(step((transpose(((X+transpose(X,12) ) |((X+transpose(X,12) ) +transpose(shuffle(X) ,7) ) ) ,-5) +transpose((step(((X+transpose(X,7) ) |echo(X,4,6) ) ,12) +echo(transpose(X,-7) ,4,6) ) ,12) ) ,12) ,4) ,12) +transpose(arpeggio(shuffle(transpose(((X+X) |X) ,-7) ) ) ,7) ) ) ,7) ) ,7) ) ) |((shuffle(transpose(((((transpose(transpose(transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ,4) +transpose((transpose(X,4) |step((X+X) ,12) ) ,-5) ) +transpose((((transpose(X,-5) |X) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) |((X|((X+transpose(X,12) ) +transpose((X|X) ,12) ) ) |((transpose(X,-7) +transpose((X|X) ,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,12) ) |(transpose((transpose(X,-5) +transpose(((X+transpose(echo(X,4,6) ,7) ) |(X+transpose((X|X) ,12) ) ) ,7) ) ,4) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(transpose(shuffle(X) ,4) ,7) ) ) ) +((((transpose(step((X+X) ,12) ,4) +transpose(transpose(transpose((X|X) ,-7) ,-7) ,4) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ,7) ) |echo(X,4,6) ) +transpose((step(X,12) +step(X,12) ) ,-7) ) ) ,-5) ) +transpose(((transpose((transpose(echo((((X+arpeggio(X) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +((arpeggio((X|X) ) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(X,7) ) ) ,4,6) ,-5) +transpose((transpose(X,4) +shuffle(X) ) ,12) ) ,-7) +transpose(echo(echo(((X+transpose(step(X,12) ,7) ) |X) ,4,6) ,4,6) ,4) ) +transpose(arpeggio(transpose((transpose(X,-7) +echo(((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) +((X+transpose(X,7) ) +transpose(X,7) ) ) ,4,6) ) ,-5) ) ,7) ) ,7) ) +transpose(arpeggio(transpose(transpose(arpeggio(echo((X|(X+transpose(X,12) ) ) ,4,6) ) ,4) ,-5) ) ,-5) ) ) ,4) ,7) ) +transpose(transpose(shuffle(arpeggio((transpose((((((transpose((X|X) ,-7) +X) +(shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(transpose(transpose(X,4) ,-5) ,12) ) +transpose((step((X+transpose(X,7) ) ,12) +transpose(arpeggio((X+transpose(transpose(arpeggio(X) ,4) ,7) ) ) ,7) ) ,4) ) +transpose(transpose((transpose(transpose(echo(X,4,6) ,-7) ,-5) +(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) |transpose((X+transpose(X,12) ) ,-7) ) ) ,4) ,7) ) ,-5) +transpose(((transpose(((((X+X) +(X+transpose(X,12) ) ) |(transpose((X|(X+transpose(X,7) ) ) ,4) |transpose(shuffle(shuffle(X) ) ,4) ) ) |shuffle(transpose(X,-5) ) ) ,-7) +transpose((((transpose((transpose(((X+transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) +transpose(transpose(((X|X) +transpose(X,12) ) ,-5) ,7) ) ,4) +transpose(shuffle(X) ,4) ) +transpose(transpose(((X+(X+transpose(X,12) ) ) +transpose(X,-7) ) ,-7) ,7) ) +transpose(transpose((echo(transpose(transpose(echo(X,4,6) ,-7) ,4) ,4,6) +transpose(transpose((X|X) ,-7) ,12) ) ,4) ,12) ) ,4) ) +transpose(transpose(arpeggio((arpeggio(transpose(X,-7) ) +transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(X,4) ) ,4) ) ) ,-7) ,7) ) ,7) ) ) ) ,4) ,7) )
random seed used was 120394586

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