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:
transpose(((((((((transpose((step(transpose(transpose(step(transpose(arpeggio(arpeggio(X) ) ,-5) ,12) ,4) ,-5) ,12) +transpose((arpeggio(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(((X|X) +X) ) ) ) ) |transpose(arpeggio(arpeggio(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,-5) ) ,12) ) ,-5) +transpose(step(step(step(((transpose(echo(shuffle(X) ,4,6) ,4) +transpose(((X+transpose(X,-5) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ,12) ,12) ,12) ,4) ) +transpose(((((shuffle(((((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |arpeggio(arpeggio(X) ) ) +transpose(step(shuffle(((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ,12) ) ) +transpose(echo(echo(echo(step(transpose(echo(X,4,6) ,4) ,12) ,4,6) ,4,6) ,4,6) ,4) ) +transpose((shuffle((shuffle(step(X,12) ) |transpose(arpeggio((((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) +transpose(((echo(X,4,6) +X) +echo(X,4,6) ) ,7) ) ) ,4) ) ) +transpose(transpose(arpeggio(step(arpeggio(transpose(echo(X,4,6) ,-7) ) ,12) ) ,4) ,12) ) ,7) ) +transpose(echo(echo(((transpose(transpose(echo(X,4,6) ,-5) ,4) +transpose((transpose(X,4) +transpose(X,4) ) ,4) ) +transpose(((X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,4,6) ,4,6) ,4) ) +transpose(transpose(arpeggio(step((((((((shuffle(X) +transpose(((arpeggio(X) +transpose((((X+X) +transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,4) ) +transpose((echo(X,4,6) |transpose(X,-7) ) ,7) ) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ,7) ) +transpose((transpose(transpose(step(X,12) ,-7) ,-7) |transpose((X+transpose(X,12) ) ,-5) ) ,4) ) +transpose(shuffle((X+(echo(X,4,6) |transpose(X,-7) ) ) ) ,7) ) |((echo(shuffle((X|X) ) ,4,6) +transpose(step(transpose(transpose(arpeggio(X) ,4) ,-5) ,12) ,7) ) +(echo((transpose(X,4) +(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ,4,6) +transpose(transpose((X|X) ,-5) ,4) ) ) ) ,12) ) ,4) ,7) ) ,7) ) +transpose(step(transpose(((((arpeggio(echo(transpose(X,-5) ,4,6) ) +transpose(transpose(step(shuffle(X) ,12) ,4) ,4) ) +transpose((((transpose(X,-7) +transpose(((step(X,12) +transpose(shuffle(shuffle(X) ) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) |(((echo(X,4,6) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) +arpeggio((X+transpose(X,12) ) ) ) ) ,7) ) +transpose(shuffle(((X+transpose(X,7) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ) ) ,12) ) |((echo(step(arpeggio((X|X) ) ,12) ,4,6) +transpose((((echo(transpose(shuffle(X) ,-7) ,4,6) |(X+transpose(X,12) ) ) +transpose(echo(echo(shuffle(echo(X,4,6) ) ,4,6) ,4,6) ,4) ) +transpose(arpeggio(transpose(((X+echo(X,4,6) ) |step(X,12) ) ,-7) ) ,7) ) ,4) ) +transpose(echo(((((X+transpose(X,7) ) +transpose(shuffle(((X+X) +transpose(X,-7) ) ) ,4) ) +transpose(transpose((X|X) ,-5) ,7) ) |step(X,12) ) ,4,6) ,7) ) ) ,-7) ,12) ,4) ) +transpose(((echo(((transpose((arpeggio(transpose(echo(shuffle(X) ,4,6) ,-5) ) |echo(((X+transpose((X+transpose(shuffle(X) ,7) ) ,4) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,4,6) ) ,-5) +transpose((echo(transpose(transpose(((echo(X,4,6) +transpose((shuffle(X) +(X+transpose(X,7) ) ) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) ,4) ,4,6) +echo(transpose((X|shuffle(transpose(X,4) ) ) ,4) ,4,6) ) ,7) ) +arpeggio((arpeggio(((X+transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) |arpeggio((arpeggio(X) |transpose(X,4) ) ) ) ) ) ,4,6) +transpose(shuffle(((step(arpeggio(((transpose((transpose(X,4) +step((echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ,-7) +transpose(transpose(arpeggio(shuffle((X+transpose(X,12) ) ) ) ,-5) ,4) ) +transpose(step(((echo((((X+X) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,4,6) +transpose((echo(X,4,6) +echo(transpose(arpeggio(echo(X,4,6) ) ,-5) ,4,6) ) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) ,12) ,7) ) ) ,12) +transpose(echo(shuffle(arpeggio((echo(step(X,12) ,4,6) +(shuffle(X) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ) ) ,4,6) ,4) ) +transpose((((step((X+(X+X) ) ,12) +transpose(transpose(step((X+transpose((X|X) ,12) ) ,12) ,-5) ,4) ) +transpose(echo(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,4,6) ,7) ) +echo(step(step(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,12) ,12) ,4,6) ) ,7) ) ) ,7) ) +step((echo(arpeggio(transpose(transpose(((step((X|X) ,12) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose((((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(step(transpose(X,-7) ,12) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,-7) ,-5) ) ,4,6) +transpose((echo(arpeggio(arpeggio((arpeggio(((X+transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +((X+transpose(echo(X,4,6) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) ) ) ) ,4,6) +transpose(arpeggio(((step(X,12) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(X,7) ) ) ,7) ) ,-7) ) ,12) ) ,7) ) +transpose((echo(transpose(shuffle(shuffle(transpose((step(echo(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,12) +((((step(X,12) +transpose((X+transpose(step(X,12) ,12) ) ,7) ) |(arpeggio((X|X) ) +step((X+transpose(X,12) ) ,12) ) ) +transpose(((echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4,6) +echo(arpeggio(transpose((X|X) ,4) ) ,4,6) ) |(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,4) ) +transpose((transpose(echo(step(X,12) ,4,6) ,4) +transpose((((X+X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) ) ,4) ) ) ,-7) ,4,6) +shuffle((transpose(((transpose((((X|X) +transpose(shuffle((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose(((echo(X,4,6) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(X,7) ) ,7) ) ,-7) +transpose(transpose(((X+transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,-7) ,4) ) +transpose(((echo(((step(step(X,12) ,12) +transpose(transpose(step((X|X) ,12) ,-5) ,4) ) +transpose((shuffle(X) |((X+transpose(X,12) ) +transpose(X,7) ) ) ,7) ) ,4,6) +transpose(shuffle(shuffle(transpose((X+transpose(X,12) ) ,4) ) ) ,7) ) |transpose((shuffle((arpeggio(X) |transpose(X,-7) ) ) +transpose(((X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,7) ) ,-7) ) ,7) ) ,-7) +step(((arpeggio(transpose((echo(X,4,6) +shuffle((X+transpose(X,7) ) ) ) ,4) ) +transpose(((((X+X) +((shuffle(X) +transpose(X,4) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ) +transpose(step(echo(X,4,6) ,12) ,-5) ) |transpose(step(((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) ,12) ,-7) ) ,4) ) +transpose((transpose(X,-7) +transpose((((shuffle(X) +transpose((X+X) ,7) ) |transpose(X,-5) ) |step(transpose(X,-5) ,12) ) ,12) ) ,7) ) ,12) ) ) ) ,4) ) +transpose(transpose(arpeggio(shuffle(shuffle(step(transpose((transpose((echo(X,4,6) +transpose(X,-7) ) ,4) +transpose(shuffle(echo(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ) ,-5) ) ,-5) ,12) ) ) ) ,-7) ,7) ) +shuffle(transpose((transpose((arpeggio(X) +(X+transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,7) ) ) ,-7) +transpose(echo(arpeggio((arpeggio((shuffle((step(X,12) |X) ) +transpose(X,4) ) ) +transpose(echo(step(X,12) ,4,6) ,12) ) ) ,4,6) ,12) ) ,-5) ) ) |transpose(echo(transpose(((step(transpose(shuffle(step(shuffle(transpose(X,-5) ) ,12) ) ,4) ,12) +transpose(transpose(shuffle(echo(shuffle(transpose(arpeggio(shuffle(X) ) ,-5) ) ,4,6) ) ,-5) ,4) ) +transpose(shuffle((((transpose(step(X,12) ,4) +transpose((((echo(X,4,6) +transpose(shuffle(((X+transpose(X,12) ) +(X+X) ) ) ,12) ) +transpose(((step(X,12) +transpose(step(X,12) ,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,7) ) ,12) ) +transpose(shuffle(((((X+X) +transpose((X|X) ,4) ) +transpose(X,7) ) +(X+transpose((X+transpose(X,7) ) ,12) ) ) ) ,4) ) +transpose(((X+(X|X) ) +transpose(transpose(X,-7) ,-7) ) ,7) ) ) ,7) ) ,4) ,4,6) ,-5) ) ,-5)
random seed used was 239084812

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