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:
transpose((arpeggio((step(((arpeggio(((transpose((((echo(transpose(X,4) ,4,6) |((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +((X+transpose(X,12) ) |X) ) ) +transpose((step(transpose((X+X) ,4) ,12) +transpose((X+transpose(X,7) ) ,-5) ) ,4) ) +transpose((((X+transpose(X,7) ) |X) |(transpose(transpose(X,-7) ,-7) |transpose(((X|X) +(X|shuffle(X) ) ) ,4) ) ) ,7) ) ,-7) +transpose((transpose(arpeggio((transpose((((transpose(X,-7) |(X+X) ) |transpose(X,-5) ) |transpose(step(X,12) ,-5) ) ,-7) |echo(step((X|X) ,12) ,4,6) ) ) ,-7) |((arpeggio(((arpeggio(X) +transpose(transpose(X,4) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) +transpose(X,-7) ) ,12) ) ) +step(((step(X,12) +transpose((transpose(X,4) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) ,4) ) +transpose(X,7) ) ,12) ) +transpose(((transpose((((step(X,12) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(shuffle(X) ,7) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,7) ) ,-5) +((transpose((X+(echo(X,4,6) +transpose(X,4) ) ) ,4) +transpose(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ,4) ) +transpose(transpose(((arpeggio((X+transpose(X,7) ) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,-5) ,7) ) ) |transpose(step(transpose(echo(X,4,6) ,4) ,12) ,4) ) ,7) ) ) ,4) ) +transpose(transpose(transpose(transpose((((step(transpose(X,4) ,12) +transpose((X|(transpose(X,4) |echo(X,4,6) ) ) ,12) ) |((X|echo(X,4,6) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) ) +transpose(shuffle(transpose(arpeggio(transpose(transpose(X,4) ,4) ) ,4) ) ,7) ) ,4) ,4) ,-5) ,7) ) ) +transpose((((echo(arpeggio(((echo((X+(X+transpose(X,7) ) ) ,4,6) |(((((X+transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) |step(transpose(X,-7) ,12) ) +step(X,12) ) +transpose(transpose(X,-7) ,-7) ) ) +transpose((((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose((X|X) ,-5) ,12) ) ,4) ) ) ,4,6) +transpose((transpose((transpose(echo(transpose((step(X,12) +(echo(X,4,6) |X) ) ,4) ,4,6) ,-7) +transpose((arpeggio(transpose(X,4) ) +shuffle(transpose(X,4) ) ) ,12) ) ,4) +(((shuffle(echo(transpose(transpose(X,4) ,-5) ,4,6) ) +transpose(transpose(shuffle(X) ,-7) ,12) ) +transpose((shuffle(transpose(X,-7) ) +(X|X) ) ,4) ) +transpose(transpose(echo(arpeggio(echo(X,4,6) ) ,4,6) ,4) ,7) ) ) ,4) ) +transpose((transpose(echo(shuffle(echo((transpose(X,4) |echo(X,4,6) ) ,4,6) ) ,4,6) ,-7) +(transpose(step(echo(echo((X|(X|X) ) ,4,6) ,4,6) ,12) ,-5) |transpose(transpose(step(X,12) ,-7) ,-7) ) ) ,7) ) +shuffle(step((((transpose(((X|X) |X) ,-5) +transpose((shuffle(echo(X,4,6) ) +transpose(transpose(transpose((X+X) ,-7) ,-7) ,12) ) ,7) ) |transpose(transpose(((X+transpose(X,12) ) |transpose(echo(X,4,6) ,-5) ) ,4) ,4) ) +transpose(((step(transpose(arpeggio(X) ,4) ,12) |(transpose(arpeggio(X) ,4) +transpose(transpose((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,7) ) ) +(transpose(transpose(transpose(transpose(X,-5) ,-5) ,4) ,-7) +transpose(((X+(X+X) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ) ,12) ) ,12) ) ) ,12) ) +arpeggio(transpose((((((transpose(step(((X+transpose((X|X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,4) +transpose(step(shuffle((X+transpose(X,12) ) ) ,12) ,12) ) +transpose((shuffle(shuffle(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) ) ) +transpose(transpose(transpose((transpose(X,-7) |(X|X) ) ,-7) ,-5) ,12) ) ,12) ) +transpose(((((X+transpose((X+X) ,12) ) +transpose((step(X,12) +(X+transpose(X,12) ) ) ,12) ) +shuffle((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |X) ) ) |transpose(transpose(echo(X,4,6) ,-5) ,4) ) ,12) ) +transpose(transpose((((echo((transpose((X+X) ,4) +(X+transpose(X,7) ) ) ,4,6) +transpose(transpose((transpose(transpose(X,4) ,4) |transpose(X,-5) ) ,-5) ,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,-5) +transpose((transpose((X+X) ,4) +step(X,12) ) ,12) ) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) ,-7) ) ,4) ,12) ) +transpose((shuffle(((transpose(X,-5) +transpose((step(X,12) +X) ,12) ) |shuffle(((echo(transpose(transpose(X,4) ,4) ,4,6) +transpose(transpose(X,-5) ,4) ) +transpose(step(transpose(echo(X,4,6) ,-5) ,12) ,7) ) ) ) ) +arpeggio(arpeggio((transpose((transpose(transpose((X+X) ,4) ,4) +shuffle((X|X) ) ) ,4) |(step((arpeggio((transpose(X,4) +X) ) |transpose(transpose((X+transpose(X,12) ) ,4) ,-5) ) ,12) +transpose((X+X) ,-5) ) ) ) ) ) ,7) ) ,-7) ) ) ,12) |echo(transpose(transpose(transpose(transpose(step(transpose(transpose((X+transpose(X,4) ) ,-5) ,-7) ,12) ,-7) ,-7) ,-7) ,-7) ,4,6) ) ) +(transpose(transpose(transpose(transpose((echo(((X+X) +(((X|(X+X) ) +transpose(((X|X) +transpose((X|X) ,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4,6) +(transpose(arpeggio(((transpose(transpose(X,-5) ,-5) +transpose((transpose(X,-7) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ) ,-7) +transpose(((transpose(shuffle(((X+X) +arpeggio(X) ) ) ,-7) +transpose(shuffle(transpose(transpose(X,-5) ,4) ) ,4) ) +transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-5) ,7) ) ,7) ) ) ,-7) ,4) ,4) ,-7) +((((transpose(arpeggio(arpeggio(transpose(((transpose(step(arpeggio(X) ,12) ,-5) +transpose(transpose(echo((X|X) ,4,6) ,-5) ,7) ) |transpose((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ) +transpose(transpose((transpose(X,4) |transpose(X,-7) ) ,4) ,12) ) ,4) ) ,-5) ) ) ,-5) +transpose(transpose(transpose(transpose((shuffle(transpose((transpose((transpose(X,4) +transpose((X+transpose(X,12) ) ,7) ) ,4) |(((transpose(X,4) +arpeggio(X) ) +transpose(((X|X) |(X|X) ) ,4) ) +transpose((transpose(X,-7) +X) ,7) ) ) ,-5) ) +transpose(transpose((transpose((transpose(X,-5) +transpose(X,7) ) ,-7) +(shuffle(X) +transpose(X,12) ) ) ,4) ,12) ) ,4) ,-7) ,-7) ,4) ) +transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(X) ) ,4) ,7) ) ,7) ) +transpose(transpose(shuffle(((((echo(((echo(((X+transpose(X,7) ) +(X+transpose(transpose(X,-7) ,12) ) ) ,4,6) |echo(transpose((((X+X) +transpose((X|X) ,4) ) +transpose(X,7) ) ,4) ,4,6) ) +transpose(arpeggio(transpose(X,-7) ) ,-7) ) ,4,6) |transpose((transpose(((transpose(X,4) |transpose(X,-5) ) +transpose(transpose(X,-7) ,7) ) ,-7) +(arpeggio(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose(arpeggio((step(transpose(transpose(X,4) ,-7) ,12) +transpose(step(transpose(X,-7) ,12) ,-7) ) ) ,12) ) +transpose(step((transpose(transpose(step(transpose((step(step(X,12) ,12) +transpose(transpose(X,-5) ,7) ) ,4) ,12) ,-7) ,4) +transpose(transpose(transpose((transpose((X+X) ,-5) |transpose((X|X) ,-5) ) ,4) ,-5) ,7) ) ,12) ,7) ) +((echo(arpeggio(arpeggio(((X+X) +transpose(X,7) ) ) ) ,4,6) +transpose(((step((transpose(step(X,12) ,-7) +transpose((shuffle(X) +transpose(transpose(X,-5) ,12) ) ,12) ) ,12) |X) |((((echo((X+transpose(X,7) ) ,4,6) +(transpose(X,4) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) +transpose(((((X+X) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) |(X+transpose(X,7) ) ) ,4) ) +transpose((transpose(X,-7) +transpose(echo(shuffle((X|X) ) ,4,6) ,12) ) ,7) ) +transpose(echo((transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) +((transpose(transpose((X|X) ,-7) ,-5) +transpose(arpeggio(X) ,4) ) +transpose((X|X) ,7) ) ) ,4,6) ,12) ) ) ,7) ) +transpose(transpose((transpose(X,-7) +transpose((((X|X) +transpose(X,-5) ) |transpose(X,-7) ) ,-7) ) ,-5) ,7) ) ) ) ,-5) ,4) ) +transpose(transpose(transpose(shuffle(shuffle(echo(((transpose(transpose(transpose(shuffle(X) ,4) ,-5) ,-7) +transpose((transpose((X+transpose(X,12) ) ,-7) +(step(X,12) +transpose((X+X) ,7) ) ) ,7) ) |step(echo(X,4,6) ,12) ) ,4,6) ) ) ,-5) ,-5) ,7) ) ) ) ,-7)
random seed used was 115264005

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