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:
Seed:
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Generations:
Phrase for X:
# of Tracks:
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After 20 generations the expression "X" became this:
step(transpose(transpose((((echo(transpose(transpose(((transpose((transpose(X,-7) |transpose((shuffle(X) +transpose(X,7) ) ,4) ) ,-7) +transpose(step(((X|X) +arpeggio(X) ) ,12) ,12) ) |((transpose(((arpeggio((echo(X,4,6) +transpose(transpose(X,4) ,12) ) ) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,4) ,4) ) +transpose(transpose(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ,-7) ,7) ) ,-7) +transpose((shuffle(X) +transpose(X,-7) ) ,4) ) +transpose(arpeggio((transpose((shuffle(transpose(X,4) ) +echo(X,4,6) ) ,-7) +transpose(shuffle(transpose(transpose(X,4) ,4) ) ,12) ) ) ,7) ) ) ,-7) ,-5) ,4,6) |arpeggio(arpeggio(transpose((arpeggio(arpeggio(step(X,12) ) ) +step((transpose(X,4) +transpose(transpose(X,-5) ,7) ) ,12) ) ,-7) ) ) ) +arpeggio(((transpose((transpose((transpose(echo(transpose(X,-5) ,4,6) ,4) +transpose(transpose(((((transpose(step((X+transpose(X,7) ) ,12) ,-7) |transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(echo((((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,4,6) ,7) ) +(((X|X) +X) +transpose((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) ,4) ) ) ,4) ,7) ) ,-7) +transpose(((((shuffle(X) |step((X+transpose(transpose(X,4) ,12) ) ,12) ) +transpose(transpose((X+transpose(transpose(X,-7) ,7) ) ,-7) ,4) ) +transpose((shuffle(X) |(((X+transpose(X,7) ) |transpose(X,-5) ) +(X+X) ) ) ,4) ) +transpose((arpeggio(transpose(X,-5) ) |((echo(X,4,6) +transpose((transpose(X,-5) +((X+X) |transpose(X,-5) ) ) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ) ,7) ) ,7) ) ,-7) +transpose(shuffle(transpose(transpose((((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) |transpose(((((X+transpose(X,12) ) |echo(X,4,6) ) +X) +transpose(((X+X) +X) ,12) ) ,4) ) ,-5) ,-5) ) ,4) ) +transpose((arpeggio(((((arpeggio(shuffle(transpose(X,-7) ) ) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose((transpose((X+transpose(X,12) ) ,-7) |transpose(((X+transpose(X,7) ) |step(transpose((X+transpose(X,12) ) ,4) ,12) ) ,4) ) ,7) ) |transpose(echo(((X+transpose((transpose((X+X) ,4) |((X+transpose(X,7) ) +(X|X) ) ) ,4) ) +transpose((X+transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) ,7) ) ,4,6) ,-5) ) +transpose(transpose(transpose(((transpose((transpose(arpeggio(X) ,-7) |arpeggio((X|X) ) ) ,4) +transpose(transpose((((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) |X) ,-5) ,4) ) +transpose(transpose(transpose(((X+X) |X) ,-7) ,4) ,7) ) ,4) ,4) ,7) ) ) +transpose(((transpose(shuffle(transpose(X,-5) ) ,4) +(transpose((transpose(transpose(X,4) ,4) +transpose(arpeggio(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) ) ,12) ) ,-7) |transpose((X|(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,4) ) ) |transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(X,12) ) ,4) ,4) ) ,7) ) ,7) ) ) ) +transpose(((transpose(step((echo(((step(transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ,12) ,-7) ,12) +transpose((step(echo(((transpose(X,4) +transpose(X,12) ) |(transpose(X,4) +transpose(X,12) ) ) ,4,6) ,12) +((transpose(transpose((step(transpose(X,-5) ,12) +transpose(transpose(X,-5) ,-7) ) ,4) ,-7) +transpose((arpeggio((X+X) ) +transpose(transpose(transpose(transpose((X+X) ,4) ,4) ,-5) ,7) ) ,12) ) +transpose(((step(X,12) +transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) ) +transpose(shuffle((echo(transpose(X,4) ,4,6) +transpose(echo(X,4,6) ,12) ) ) ,-7) ) ,7) ) ) ,4) ) +transpose((echo(echo(X,4,6) ,4,6) |((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ) ,7) ) ,4,6) +transpose(arpeggio(((((transpose(transpose(transpose(X,-5) ,-5) ,-5) +transpose(((((X+X) |transpose(X,-5) ) +transpose((X+step(X,12) ) ,7) ) +transpose(transpose(transpose(arpeggio(shuffle(X) ) ,-5) ,4) ,12) ) ,12) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) +transpose(((shuffle(transpose(((arpeggio((X|X) ) +transpose(X,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) ,-7) ) |arpeggio(echo(shuffle((echo((X+transpose(X,12) ) ,4,6) +transpose((transpose(X,-7) +transpose(X,12) ) ,12) ) ) ,4,6) ) ) |((transpose(transpose(transpose(((X+X) +transpose(transpose(X,-7) ,12) ) ,4) ,-7) ,4) +transpose((echo((transpose(X,4) +X) ,4,6) +transpose((transpose(X,-5) +echo(X,4,6) ) ,12) ) ,4) ) +transpose(transpose((((transpose(X,-5) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) |transpose(X,-5) ) ,4) ,7) ) ) ,4) ) +transpose(step(shuffle(shuffle(arpeggio(transpose((X|X) ,4) ) ) ) ,12) ,7) ) ) ,7) ) ,12) ,4) +transpose(transpose((transpose(echo((((transpose(transpose(X,-5) ,-5) +transpose((((X|shuffle(X) ) |((transpose((X+transpose(X,7) ) ,4) +transpose((X+transpose(X,12) ) ,12) ) +transpose((transpose((X|X) ,-5) +((transpose(X,-5) +transpose((X+X) ,12) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,7) ) ) +transpose(((((transpose(X,-5) |X) +transpose(transpose(X,4) ,12) ) +transpose(transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ,4) ) +transpose(transpose(arpeggio((X+(X+transpose(X,7) ) ) ) ,-5) ,7) ) ,12) ) ,12) ) +(((((echo((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) ,4,6) |((transpose(shuffle(X) ,4) |(transpose(X,4) |(X+transpose((X|X) ,12) ) ) ) |(X+(transpose(X,4) |X) ) ) ) +transpose(shuffle(transpose((transpose(X,-7) |X) ,-5) ) ,12) ) +transpose(transpose(X,4) ,12) ) +transpose(transpose(transpose((transpose(((transpose((X|X) ,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) |(step(arpeggio(X) ,12) +transpose(X,12) ) ) ,4) +transpose(transpose((transpose(step(X,12) ,-5) +transpose(transpose(transpose((X|X) ,4) ,-5) ,12) ) ,-5) ,12) ) ,-5) ,-5) ,4) ) +transpose(((((transpose((X+X) ,4) +transpose(echo(X,4,6) ,12) ) |((X|(X+transpose(X,7) ) ) |transpose((X+X) ,-7) ) ) +(transpose(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,-5) +transpose(((X+transpose(X,7) ) |transpose(X,4) ) ,12) ) ) +transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) +transpose(((X+transpose(X,-5) ) |transpose((X|(X+transpose(X,7) ) ) ,-7) ) ,12) ) ,4) ) ,7) ) ) |(((step(arpeggio(shuffle(shuffle(X) ) ) ,12) +transpose(transpose(transpose(transpose((arpeggio(X) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,-5) ,-7) ,-7) ,7) ) +transpose(transpose((echo(transpose(echo(transpose((X+transpose(X,7) ) ,4) ,4,6) ,-5) ,4,6) |step(arpeggio(step(transpose(transpose(step(X,12) ,-7) ,-5) ,12) ) ,12) ) ,-7) ,4) ) +transpose(transpose(((transpose(transpose((transpose(X,4) +(arpeggio(shuffle(X) ) |X) ) ,4) ,4) +transpose(transpose(((shuffle((X+X) ) +transpose((X|X) ,4) ) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,7) ) ,-7) ,4) ) +transpose((transpose(transpose(((echo(X,4,6) +transpose(transpose(X,4) ,7) ) +(transpose(X,4) |X) ) ,-5) ,4) +(echo(transpose(X,-7) ,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) ,4) ,7) ) ) ,4,6) ,-7) |transpose(shuffle(transpose(transpose((transpose(X,-5) |((X+X) |X) ) ,-7) ,-7) ) ,-5) ) ,-7) ,4) ) +transpose(transpose(transpose((transpose((transpose(((transpose(transpose((X|X) ,4) ,4) +transpose(transpose((arpeggio((X+X) ) |((((X+transpose(X,12) ) +transpose(X,-5) ) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) +((transpose(X,-5) +X) +transpose(arpeggio(shuffle(X) ) ,7) ) ) ) ,4) ,4) ) +transpose(echo((((transpose(X,-5) |(X+transpose(X,12) ) ) +((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) |transpose(X,-5) ) ,4,6) ,7) ) ,-5) +transpose((((((transpose((X+X) ,-5) +transpose(transpose((transpose(X,4) |transpose(X,4) ) ,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +((step(step(X,12) ,12) +transpose(X,12) ) +transpose(echo(X,4,6) ,12) ) ) +(X+transpose(transpose(shuffle(X) ,4) ,12) ) ) +(shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ) +(transpose((X+transpose(X,12) ) ,-7) +transpose(arpeggio(transpose(X,4) ) ,-7) ) ) ) ,12) ) ,4) +(transpose(((transpose((X+(X|X) ) ,-5) +(((X+X) |X) +(step(X,12) +transpose(transpose(X,-7) ,12) ) ) ) +(transpose(echo(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,4,6) ,4) +transpose(arpeggio(step(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) ) ,12) ) ,7) ) ) ,4) +transpose((arpeggio((X+transpose(step(X,12) ,12) ) ) +transpose((arpeggio(((shuffle((X+transpose(X,12) ) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) |(echo((X|X) ,4,6) +shuffle(transpose(X,4) ) ) ) ,-7) ) ,4) ) ) ,4) ,-5) ,7) ) ,12) ) ,-5) ,-5) ,12)
random seed used was 163914936

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