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:
# of Tracks:
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After 20 generations the expression "X" became this:
(shuffle((((echo(((transpose(((shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) +(transpose(transpose(X,-7) ,-7) |shuffle(((transpose(X,-5) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose(((X+transpose(X,7) ) |(X+X) ) ,7) ) ) ) ) +transpose(transpose(((transpose((transpose(X,4) +(X+transpose(X,7) ) ) ,-5) +transpose((X|X) ,4) ) +transpose(((X|X) +step(X,12) ) ,7) ) ,-7) ,4) ) ,-7) +(echo((((((shuffle((((X+X) +X) +X) ) +transpose(step(transpose((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) ,-7) ,12) ,4) ) +transpose((arpeggio(transpose((X|X) ,-7) ) +(transpose(transpose(X,-5) ,4) +(X+transpose(step(X,12) ,7) ) ) ) ,7) ) +arpeggio((((X+transpose(X,7) ) |X) |transpose((X|X) ,-7) ) ) ) +transpose((transpose(((X|step(X,12) ) +(X+X) ) ,-7) +((X+transpose(transpose((X|X) ,4) ,7) ) |(transpose(X,-5) +(X+transpose(X,7) ) ) ) ) ,4) ) +transpose(transpose((shuffle(X) |((X+transpose((X+X) ,7) ) +transpose(transpose(X,4) ,-5) ) ) ,4) ,7) ) ,4,6) +transpose(transpose(transpose(((shuffle(X) +transpose(transpose(X,-5) ,7) ) +transpose(step((echo(X,4,6) +transpose(X,7) ) ,12) ,12) ) ,-7) ,-5) ,4) ) ) +transpose((echo((arpeggio((shuffle(X) |transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) ) ) +transpose((shuffle(echo(transpose(X,-5) ,4,6) ) |(echo((X|echo(X,4,6) ) ,4,6) +transpose((X|X) ,12) ) ) ,7) ) ,4,6) +transpose(echo((echo(transpose(X,-5) ,4,6) +transpose(transpose(X,-5) ,7) ) ,4,6) ,4) ) ,12) ) ,4,6) +transpose((((transpose((((transpose((X|echo(transpose(X,4) ,4,6) ) ,-5) |transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +step(X,12) ) +arpeggio(((X+transpose(X,12) ) +transpose(X,7) ) ) ) |((transpose(transpose(X,-7) ,-5) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) +transpose(((transpose(X,4) |X) +transpose(X,12) ) ,12) ) ) ,-7) ) +transpose(echo(transpose(((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,4,6) ,4) ) +transpose(transpose(((transpose((X+transpose(X,-5) ) ,4) +transpose(((transpose(X,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) ,-7) ) +transpose(echo(arpeggio(((((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) +transpose(transpose((X|X) ,-7) ,12) ) +transpose((X+transpose(transpose(X,-7) ,7) ) ,7) ) ) ,4,6) ,12) ) ,-7) ,7) ) ,-7) |echo(transpose(arpeggio(transpose(transpose(transpose(X,-5) ,4) ,-7) ) ,-5) ,4,6) ) |(((arpeggio(((X+(transpose(transpose(X,4) ,-7) +transpose(transpose(X,4) ,12) ) ) +transpose((arpeggio(transpose(transpose((X|X) ,-7) ,-7) ) +transpose(step(arpeggio(X) ,12) ,7) ) ,7) ) ) +transpose(transpose((transpose((((X+transpose(X,7) ) |(X+X) ) +transpose(transpose(X,-7) ,4) ) ,-5) +((X+transpose(transpose(transpose(transpose(X,-7) ,-7) ,4) ,4) ) +transpose(transpose(step(shuffle(shuffle(X) ) ,12) ,-7) ,7) ) ) ,-7) ,4) ) +transpose(arpeggio(transpose(transpose((arpeggio((transpose(X,-7) +transpose(transpose(X,-7) ,-5) ) ) |(transpose(arpeggio(((X+transpose(X,12) ) +transpose(X,-7) ) ) ,-7) +transpose((((((X+transpose((X|X) ,4) ) +transpose((X|X) ,7) ) +transpose(X,4) ) +transpose((((X|X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) |shuffle(X) ) ,12) ) ) ,4) ,4) ) ,7) ) |((transpose(transpose(transpose(step(X,12) ,4) ,4) ,-5) +transpose(transpose((transpose(transpose(((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,4) ,-7) +transpose(transpose(transpose(transpose(transpose(transpose(X,-5) ,-7) ,4) ,-5) ,-5) ,7) ) ,-7) ,4) ) +transpose(shuffle(transpose(transpose(((step(transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,12) |arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) ) |echo((arpeggio(X) |transpose((X+X) ,4) ) ,4,6) ) ,4) ,-5) ) ,7) ) ) ) +transpose(transpose((echo(arpeggio(transpose(X,-7) ) ,4,6) |((X|transpose(X,-7) ) +transpose(transpose((transpose(X,-5) +shuffle(X) ) ,-7) ,12) ) ) ,-7) ,-5) ) ,12) ) +transpose((echo((step((echo(transpose(X,-7) ,4,6) +transpose((echo(echo(X,4,6) ,4,6) +transpose(arpeggio((X+transpose((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ,7) ) ) ,12) ) ,12) ) ,12) +(step(((shuffle(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ) |transpose(transpose((X|X) ,-5) ,-7) ) +transpose(transpose(transpose((X+X) ,4) ,4) ,7) ) ,12) +transpose(((echo((X+transpose(X,7) ) ,4,6) +transpose(shuffle((arpeggio(X) |X) ) ,7) ) |transpose((arpeggio((X+transpose(X,7) ) ) +transpose((X+transpose(X,12) ) ,-5) ) ,-7) ) ,12) ) ) ,4,6) +transpose(transpose(transpose(transpose(arpeggio((transpose(transpose(((X+(X|X) ) +transpose((X|(X+transpose(X,7) ) ) ,12) ) ,-7) ,-5) |((((transpose((X|X) ,-7) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(transpose((X+transpose(X,12) ) ,4) ,12) ) ,12) ) +transpose(transpose(X,-5) ,-7) ) +transpose(transpose(step(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,12) ,-5) ,4) ) +transpose((shuffle(shuffle(X) ) +arpeggio(X) ) ,7) ) ) ) ,-7) ,-7) ,4) ,12) ) ,7) ) +((transpose((echo((echo((transpose((X|X) ,-7) +echo(X,4,6) ) ,4,6) |(transpose((X|X) ,-5) +(((echo((X+transpose(X,12) ) ,4,6) +transpose(echo(echo(X,4,6) ,4,6) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) +transpose((X+transpose(X,12) ) ,4) ) ) ) ,4,6) +transpose(transpose(transpose(transpose(transpose(arpeggio(shuffle(X) ) ,4) ,-5) ,-7) ,-7) ,12) ) ,4) +transpose((((transpose((((((X+transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose((transpose(X,-5) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,7) ) +transpose(transpose(transpose(transpose((transpose((transpose(X,4) +arpeggio(X) ) ,-5) |transpose(shuffle(X) ,-5) ) ,4) ,-7) ,4) ,7) ) ,-7) +transpose(((step(transpose(transpose((shuffle(((((X+transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(((X|X) +shuffle(X) ) ,7) ) +transpose(step(X,12) ,4) ) |transpose(step((X+X) ,12) ,4) ) ) |arpeggio(transpose((X+transpose(transpose(X,-5) ,7) ) ,-5) ) ) ,4) ,-5) ,12) +step((transpose(transpose(transpose(arpeggio(shuffle((X+X) ) ) ,-7) ,-5) ,-7) +transpose(transpose((transpose((transpose(transpose(X,4) ,-5) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) ,-5) |(((transpose(((X+X) +transpose(X,12) ) ,-5) +transpose(transpose(X,-7) ,12) ) +transpose((shuffle(((X|X) +(X+transpose(X,12) ) ) ) +transpose(echo((X+X) ,4,6) ,-5) ) ,4) ) +transpose(((X+transpose(X,-5) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ) ,4) ,12) ) ,12) ) +transpose(((transpose((step((X+X) ,12) |X) ,4) +((step(echo(echo(X,4,6) ,4,6) ,12) |transpose((X+X) ,-7) ) |echo(transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) ,4,6) ) ) |transpose((arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +arpeggio(X) ) ,4) ) ) |step(echo((transpose(transpose(X,-5) ,4) +transpose(transpose((((step(X,12) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ,12) ) ,4,6) ,12) ) ,-5) ) ,7) ) ,4) ) +transpose(echo((echo(((((X+X) +X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose(arpeggio(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,-5) ) ,7) ) ,4,6) +(transpose(arpeggio(transpose((X+shuffle(X) ) ,-7) ) ,-7) +transpose((transpose((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,-5) |transpose(transpose(X,-7) ,-5) ) ,7) ) ) ,4,6) ,7) ) +transpose(transpose((transpose(((shuffle(transpose(step(echo(X,4,6) ,12) ,-7) ) +transpose(transpose((X+X) ,-7) ,12) ) +transpose(transpose(transpose(step((X+transpose(X,12) ) ,12) ,-7) ,4) ,12) ) ,4) +transpose(transpose(((X+transpose(X,7) ) +((X+transpose(X,7) ) +X) ) ,4) ,4) ) ,-5) ,-5) ) ,4) ) +transpose(transpose(((step(transpose(transpose((((arpeggio((X+echo(X,4,6) ) ) +transpose((transpose(transpose(X,-5) ,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((step(transpose((X+transpose(X,7) ) ,-7) ,12) +step(step(X,12) ,12) ) ,12) ) ,4) ,-5) ,12) +(echo(transpose((((X+X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ,4,6) +transpose(((shuffle(shuffle(transpose(shuffle(transpose(X,4) ) ,-7) ) ) +transpose(step(arpeggio(((transpose(transpose(X,-7) ,4) +((X+(X+(X+X) ) ) +transpose((X+transpose(shuffle(transpose(X,-7) ) ,12) ) ,12) ) ) +shuffle((X|transpose(X,-5) ) ) ) ) ,12) ,4) ) +transpose(transpose(transpose((X|X) ,-7) ,-5) ,7) ) ,12) ) ) +transpose(transpose((transpose(echo(X,4,6) ,4) +transpose(step(((transpose(X,-7) +transpose(arpeggio(X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ,7) ) ,-5) ,7) ) ,-5) ,7) ) ) ) +transpose((arpeggio(step(transpose(transpose(((((X+transpose(X,7) ) +transpose(transpose(echo(X,4,6) ,-5) ,12) ) +transpose(transpose((((X|X) +transpose(transpose(X,4) ,7) ) +transpose((X|transpose(X,-5) ) ,12) ) ,-7) ,7) ) +((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ) ,-5) ,-5) ,12) ) +transpose(transpose(echo(transpose((step((X+(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step((X+transpose(X,7) ) ,12) ,12) ) ) ,12) |arpeggio(shuffle(((transpose(X,-5) +transpose(X,-5) ) +(arpeggio(X) +transpose(transpose(X,4) ,7) ) ) ) ) ) ,-5) ,4,6) ,4) ,12) ) ,7) )
random seed used was 239870896

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