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 16 generations the expression "X" became this:
(transpose((step(((transpose(((((transpose((echo((((step(X,12) +transpose(X,4) ) +transpose(X,7) ) |transpose((arpeggio(X) |(X+X) ) ,-7) ) ,4,6) |((step((transpose(X,-7) +transpose(X,7) ) ,12) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) +transpose(transpose(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) ,-5) ,12) ) ) ,-7) +transpose(transpose((transpose(echo(X,4,6) ,-7) +transpose(X,12) ) ,4) ,4) ) +transpose(((transpose(((transpose(X,-5) |shuffle((X+X) ) ) +transpose((X+transpose(arpeggio(((X+transpose(X,7) ) +echo(X,4,6) ) ) ,7) ) ,7) ) ,-7) +transpose((transpose((X+transpose(X,12) ) ,-5) |transpose((transpose(transpose(X,-5) ,4) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,-5) ) ,4) ) +transpose(step((shuffle(echo((X+transpose(X,12) ) ,4,6) ) +transpose((X+(X|X) ) ,7) ) ,12) ,7) ) ,7) ) |transpose(echo(((transpose(X,-5) +transpose(X,12) ) +transpose(X,-5) ) ,4,6) ,-5) ) |((transpose(((((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(((X|X) |X) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose((echo(X,4,6) +X) ,12) ) ,-5) +transpose(echo(((X+((X+transpose(X,12) ) |X) ) +transpose((transpose(X,-7) +X) ,7) ) ,4,6) ,-7) ) +(((echo(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4,6) |arpeggio((echo(X,4,6) |((X+transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) ) ) ) +transpose(shuffle(transpose((X+X) ,4) ) ,12) ) +(step(transpose(transpose(X,-7) ,-7) ,12) +transpose(((((X+X) +(X+transpose(X,12) ) ) +arpeggio((X+transpose(transpose(X,-5) ,12) ) ) ) +((X+transpose(X,7) ) +transpose(X,7) ) ) ,7) ) ) ) ) ,-5) +transpose((arpeggio((transpose(shuffle(transpose((X+X) ,-7) ) ,-5) +transpose((transpose(arpeggio(X) ,-7) |((transpose(X,-5) +shuffle(transpose(X,4) ) ) +transpose(((shuffle(X) +transpose(transpose(step((X+transpose(X,12) ) ,12) ,-7) ,4) ) +transpose(((X+transpose((arpeggio(X) +transpose(X,7) ) ,4) ) +transpose((X+transpose((X|X) ,12) ) ,7) ) ,7) ) ,7) ) ) ,12) ) ) +transpose(arpeggio((transpose(((echo(((X|(X+X) ) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(X,-7) ,-7) ) ,7) ) ,4,6) |(echo(echo(X,4,6) ,4,6) |step((X+transpose((X+X) ,7) ) ,12) ) ) +((((((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,7) ) |echo(X,4,6) ) +transpose((X+((X|X) |X) ) ,12) ) +transpose(transpose((X+X) ,4) ,7) ) ) ,-7) +((((((X|(((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) +transpose(transpose(X,-7) ,7) ) ) +transpose((transpose(transpose(X,4) ,4) |transpose(X,-5) ) ,4) ) +transpose((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose((((transpose((X+transpose(X,7) ) ,-5) +transpose(((X+transpose(X,12) ) +transpose(X,4) ) ,7) ) +transpose(step(X,12) ,-7) ) |((transpose(X,-7) |transpose((X+transpose(X,7) ) ,-7) ) |transpose((transpose(echo(X,4,6) ,4) +transpose(transpose(shuffle(X) ,4) ,7) ) ,-7) ) ) ,12) ) +transpose((transpose((transpose(echo(X,4,6) ,-7) +transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +echo(X,4,6) ) ,12) ) ,4) |transpose((((X|X) |transpose(X,4) ) +transpose(echo(transpose(echo(X,4,6) ,-5) ,4,6) ,12) ) ,-5) ) ,4) ) +transpose(transpose((step(((((step(X,12) |(X+X) ) +transpose(X,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) +transpose(echo((transpose(X,-5) |transpose(X,-7) ) ,4,6) ,12) ) ,12) +transpose(transpose((X+transpose((X|X) ,12) ) ,-5) ,12) ) ,-5) ,7) ) ) ) ,7) ) ,4) ) +transpose(transpose(shuffle(transpose(arpeggio(((step(transpose(X,4) ,12) +transpose(echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) ,12) ) |transpose(((((step(transpose(X,-5) ,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) +transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-5) ) ) ,-5) ) ,-7) ,7) ) ,12) +transpose((transpose(echo((((transpose(X,-7) +transpose(X,4) ) +transpose(((X|X) +shuffle(X) ) ,7) ) +transpose(transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,4) ,-5) ) ,4,6) ,4) |(transpose(transpose(((transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose((transpose(X,-7) +transpose(echo((X|X) ,4,6) ,7) ) ,7) ) ,-5) ,-5) |(((((((((X+X) |transpose(transpose(X,4) ,-7) ) +transpose(step(transpose(transpose(X,4) ,-5) ,12) ,4) ) +((step(transpose(arpeggio(X) ,-5) ,12) +transpose((((echo(transpose(X,-7) ,4,6) +transpose(((X|X) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) |(transpose(X,-5) |transpose(X,-5) ) ) ,4) ) +transpose(echo((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,7) ) ) +transpose(shuffle(((X+step(X,12) ) +transpose((((echo(X,4,6) +transpose((X|X) ,4) ) +transpose((X|X) ,7) ) |((X+X) +transpose((X+transpose(X,12) ) ,12) ) ) ,7) ) ) ,12) ) +transpose((((transpose(X,-5) +transpose((X+X) ,12) ) +(((X+X) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ) +transpose(X,7) ) ,4) ) +transpose(transpose((transpose(((step(X,12) +transpose(((X|X) |shuffle(X) ) ,4) ) +transpose((X|X) ,7) ) ,-5) |shuffle(step((transpose(X,4) |(X+X) ) ,12) ) ) ,4) ,7) ) +transpose(((transpose((((X+transpose((X+X) ,12) ) +((X+X) +transpose(X,7) ) ) +transpose(arpeggio(X) ,-7) ) ,4) +transpose(shuffle(transpose(((transpose(X,4) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(shuffle(X) ,7) ) ,-5) ) ,4) ) +transpose(arpeggio(transpose(transpose(transpose(echo((X+X) ,4,6) ,-5) ,-7) ,4) ) ,7) ) ,4) ) +transpose(((shuffle(transpose(arpeggio((X|X) ) ,-7) ) |transpose((transpose((X|X) ,4) +transpose((X|X) ,12) ) ,4) ) +transpose(((transpose(X,-7) +X) |transpose(transpose(X,-7) ,-5) ) ,12) ) ,7) ) ) ) ,-5) ) ,4) +transpose(((transpose(transpose(((((transpose(transpose(((X|X) |(X+transpose(X,7) ) ) ,-7) ,4) +arpeggio(shuffle(echo(X,4,6) ) ) ) |(((arpeggio(shuffle((echo((X+transpose(X,12) ) ,4,6) |transpose(transpose(X,4) ,4) ) ) ) +((shuffle(((X+X) |transpose(X,-7) ) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) +transpose((transpose(X,-5) |(X+transpose(transpose(X,-5) ,12) ) ) ,7) ) ) +transpose(((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,12) ) +transpose((X+transpose(X,4) ) ,4) ) +transpose((transpose(arpeggio((X+transpose(X,7) ) ) ,4) +arpeggio((X+X) ) ) ,7) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,-7) ,-5) ) ,12) ) |transpose(((arpeggio(transpose((X+X) ,-7) ) +transpose(arpeggio((X+transpose((X|X) ,12) ) ) ,4) ) +transpose(arpeggio(transpose((transpose(X,4) +transpose(X,-5) ) ,-7) ) ,7) ) ,-7) ) ) |((transpose(transpose(X,-7) ,4) |(transpose(X,4) +transpose(transpose(X,-7) ,12) ) ) +transpose(transpose(((transpose(transpose(transpose(transpose(X,4) ,-5) ,4) ,4) +transpose((transpose(((transpose((X+X) ,-7) +transpose((X|X) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ,-5) +(arpeggio((echo(X,4,6) +transpose(X,-7) ) ) +((X+transpose(X,12) ) +X) ) ) ,4) ) +transpose((transpose((X|X) ,4) +(transpose((X|X) ,4) |(transpose(X,-7) |(X+X) ) ) ) ,7) ) ,-5) ,12) ) ) +((X+transpose(step(((X+transpose(X,12) ) +(echo(X,4,6) +shuffle(X) ) ) ,12) ,7) ) +transpose(transpose(transpose((((transpose((transpose(X,4) +transpose(X,7) ) ,-7) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(transpose((((X+transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) |echo(X,4,6) ) ,-7) ,7) ) +transpose(arpeggio(step(step((arpeggio(X) +((X+X) +transpose(X,7) ) ) ,12) ,12) ) ,12) ) ,-5) ,-7) ,7) ) ) ,-5) ,4) +transpose(echo((shuffle(step((((transpose(transpose(X,-7) ,-7) +transpose(((transpose((X|X) ,-5) +transpose(X,4) ) +transpose((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,7) ) +transpose((transpose(arpeggio(shuffle(transpose(X,4) ) ) ,-7) +((X+transpose(X,7) ) |transpose(X,-5) ) ) ,4) ) +transpose(step((transpose(transpose((X+X) ,-7) ,4) +echo(step((X|X) ,12) ,4,6) ) ,12) ,7) ) ,12) ) +transpose(transpose(shuffle(((step((arpeggio(echo((X+transpose(X,7) ) ,4,6) ) +transpose(step(X,12) ,7) ) ,12) |transpose((((X|transpose((X+transpose(X,12) ) ,4) ) +(transpose(X,-7) +transpose(X,12) ) ) +transpose(((transpose(transpose(X,-5) ,4) +((transpose(X,-5) +transpose(step(X,12) ,4) ) +transpose((X+X) ,7) ) ) +transpose((echo(X,4,6) +(X|X) ) ,4) ) ,12) ) ,-7) ) +transpose(transpose((X|X) ,-5) ,-7) ) ) ,-7) ,12) ) ,4,6) ,4) ) +transpose(step((step(((shuffle((((X+X) +transpose(X,4) ) +transpose((X+X) ,7) ) ) +transpose(transpose((transpose(X,4) +transpose((X+(X+X) ) ,12) ) ,4) ,4) ) +transpose(transpose(((transpose(transpose(X,4) ,-5) +transpose((X+X) ,7) ) |((echo(X,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ) ,4) ,7) ) ,12) |(transpose(transpose(transpose(echo(((echo(X,4,6) +X) +step(shuffle((X+transpose(X,7) ) ) ,12) ) ,4,6) ,-7) ,-7) ,-7) +(shuffle(arpeggio(arpeggio(transpose(((step(echo(X,4,6) ,12) +((((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose((X|X) ,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ) |(transpose((X+X) ,-5) +transpose(X,4) ) ) ,4) ) ) ) +transpose((arpeggio(((transpose(echo(X,4,6) ,4) +transpose((shuffle(((X|X) |transpose(X,4) ) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(((X+X) +(X|X) ) ,12) ) ,7) ) ) +transpose(shuffle((((X+(X+transpose(X,7) ) ) +transpose((X|X) ,12) ) +transpose((transpose(X,4) +(X|X) ) ,12) ) ) ,12) ) ,-5) ) ) ) ,12) ,7) ) ,7) )
random seed used was 218586907

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