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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Phrase for X:
# of Tracks:
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After 20 generations the expression "X" became this:
transpose((((transpose(transpose(step((transpose((shuffle(((shuffle(X) +transpose(X,-7) ) +transpose(transpose(X,-7) ,7) ) ) +transpose((shuffle(shuffle(arpeggio(transpose(X,4) ) ) ) |((arpeggio(arpeggio(X) ) +transpose((shuffle(X) |X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,12) ) ,-7) +transpose(echo((transpose((shuffle((transpose(transpose(transpose(X,-7) ,4) ,-5) +transpose((step(((transpose(X,-5) +transpose(X,7) ) |(arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) ) ,12) +((transpose(X,-5) +transpose(X,12) ) +transpose(((shuffle(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((X+X) +transpose(X,12) ) ,7) ) ,7) ) ) ,7) ) ) +(((transpose(transpose(echo(transpose(X,-7) ,4,6) ,-5) ,-7) +transpose((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) +transpose(shuffle(arpeggio((X|X) ) ) ,12) ) ,4) ) +transpose((transpose(transpose(X,-7) ,-7) +transpose((arpeggio(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) ,7) ) +transpose((arpeggio(X) +transpose(shuffle(step(X,12) ) ,7) ) ,7) ) ) ,-7) +transpose(echo((transpose((shuffle((transpose(X,-7) +transpose(X,12) ) ) |X) ,-5) |(echo(arpeggio(X) ,4,6) +transpose(((transpose(X,-5) +transpose(arpeggio(X) ,7) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ) ,4,6) ,12) ) ,4,6) ,7) ) ,12) ,4) ,-5) +transpose(transpose(step(((step(transpose((((transpose((((transpose(arpeggio(X) ,-7) +transpose(arpeggio(shuffle(X) ) ,4) ) +transpose(arpeggio(((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(X,12) ) ) ,7) ) +transpose(transpose(step(arpeggio(X) ,12) ,-5) ,7) ) ,-7) +transpose(transpose((shuffle(X) +transpose((transpose(transpose(X,-5) ,-7) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,7) ) ,-5) ,7) ) +transpose((((echo((step(X,12) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ,4,6) +transpose((step(transpose(X,-5) ,12) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,7) ) +(transpose(echo(transpose(X,-7) ,4,6) ,4) |transpose(X,-7) ) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ,4) ) +transpose(transpose(transpose(transpose(transpose((((X+transpose(X,12) ) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose((X|X) ,-7) ) ,4) ,-5) ,-5) ,-5) ,7) ) ,-7) ,12) +transpose(shuffle((transpose(transpose(transpose(transpose(transpose(transpose(X,-5) ,4) ,-5) ,-7) ,-5) ,-7) +echo((transpose(((arpeggio(step(X,12) ) +transpose(((echo(X,4,6) +transpose(X,7) ) +transpose(((arpeggio(((X+X) +transpose(X,12) ) ) +transpose(echo(transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ,4,6) ,7) ) |transpose(shuffle(step(transpose(X,4) ,12) ) ,-7) ) ,12) ) ,4) ) +transpose(transpose((transpose((arpeggio((X+X) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ,4) +transpose(transpose(echo((echo(X,4,6) +transpose(X,4) ) ,4,6) ,-7) ,12) ) ,-5) ,7) ) ,-5) +((shuffle((echo(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,4,6) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ) +transpose(shuffle((shuffle(transpose(transpose(step(step(X,12) ,12) ,4) ,-5) ) |transpose((arpeggio(X) |X) ,-5) ) ) ,4) ) +transpose(shuffle(transpose((arpeggio(transpose(X,-7) ) +transpose(X,7) ) ,4) ) ,7) ) ) ,4,6) ) ) ,4) ) +transpose(transpose((((arpeggio((((transpose(((shuffle(echo((X+transpose(X,7) ) ,4,6) ) +transpose(step(transpose(X,-7) ,12) ,4) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) ,7) ) ,-5) +transpose(transpose(transpose(step(X,12) ,-5) ,-7) ,4) ) +transpose(X,7) ) +transpose((((arpeggio(echo(X,4,6) ) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose((transpose(X,4) +transpose((X+transpose((X|X) ,12) ) ,12) ) ,7) ) +transpose(step((X+X) ,12) ,7) ) ,-7) ) ) +transpose(echo(transpose(((transpose(transpose((X+X) ,4) ,-5) +transpose(transpose(((step(echo(X,4,6) ,12) +transpose((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,4) ) +transpose(echo((X+transpose((X+transpose(X,12) ) ,12) ) ,4,6) ,7) ) ,-7) ,4,6) ,4) ) +transpose(transpose(transpose(transpose(arpeggio(transpose(X,-7) ) ,-5) ,-5) ,-5) ,7) ) +transpose((step(transpose((((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,-7) ) +transpose(echo(((step(X,12) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,12) ) ,-5) ,12) +transpose((((transpose(transpose(X,-5) ,-5) +transpose((transpose(X,-7) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,12) ) +transpose(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ,4) ) +transpose(arpeggio((((transpose(X,-5) +transpose(((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((X|X) ,12) ) ) ,7) ) ,7) ) ,7) ) ,-7) ,7) ) ,12) ,-5) ,4) ) +transpose((((transpose((((arpeggio(transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,-7) ) +transpose(shuffle((((step((X+transpose(X,12) ) ,12) |X) +transpose((((X+transpose(X,-5) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ) ,7) ) +transpose((transpose(((arpeggio(transpose(X,-7) ) +transpose(X,7) ) +((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +X) ) ,4) +transpose(((transpose((transpose(transpose(X,4) ,-5) +transpose(transpose(X,4) ,7) ) ,-5) +transpose(((step(step(shuffle(X) ,12) ,12) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose(((transpose(X,4) |X) +transpose(transpose(shuffle(X) ,4) ,7) ) ,7) ) ,12) ) +transpose(((transpose(transpose(X,-7) ,-5) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) +transpose(((transpose(X,-7) +transpose((X+(X+transpose(X,12) ) ) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) ,12) ) ,12) ) ,12) ) ,4) ) +transpose(transpose((arpeggio(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-5) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,-7) ,7) ) ,-5) +step(((arpeggio(((arpeggio((echo((X|X) ,4,6) |(X|X) ) ) +transpose(echo((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,7) ) +transpose((transpose(arpeggio(X) ,4) +(X|X) ) ,12) ) ) +transpose((transpose(((arpeggio((transpose(X,-5) +transpose(X,12) ) ) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) +transpose((transpose(arpeggio((X+echo(X,4,6) ) ) ,-7) +transpose((transpose(echo(X,4,6) ,-7) +transpose(transpose((arpeggio(X) +shuffle(X) ) ,-7) ,7) ) ,7) ) ,7) ) ,12) ) +transpose((transpose(echo(echo((step(transpose(X,-5) ,12) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4,6) ,4,6) ,-5) +transpose(transpose(step(((transpose(transpose((X|X) ,-5) ,4) +transpose(step(transpose(X,-5) ,12) ,4) ) +transpose(((transpose(arpeggio(echo(X,4,6) ) ,4) +transpose(arpeggio(transpose(transpose(X,-7) ,-7) ) ,4) ) +transpose(transpose(transpose(step(X,12) ,-7) ,-5) ,7) ) ,7) ) ,12) ,-7) ,7) ) ,7) ) ,12) ) +transpose(transpose((transpose(transpose(transpose((transpose(arpeggio(X) ,-7) +transpose(X,-7) ) ,-7) ,-5) ,-7) |arpeggio(arpeggio(transpose(X,-5) ) ) ) ,4) ,-7) ) +transpose(shuffle(step(((transpose(echo(transpose(arpeggio(transpose((X+transpose(X,7) ) ,-7) ) ,-5) ,4,6) ,-5) +shuffle(((((transpose(arpeggio(echo(X,4,6) ) ,-5) +transpose(arpeggio(X) ,12) ) |(echo(transpose(X,-7) ,4,6) +transpose((arpeggio(shuffle(X) ) +transpose(X,-5) ) ,12) ) ) +transpose((shuffle(transpose(step(X,12) ,-7) ) +transpose((echo(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) |shuffle(step(transpose(X,-7) ,12) ) ) ,7) ) ,4) ) +transpose(transpose(transpose((((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(step(X,12) ,7) ) ,7) ) +transpose(arpeggio(arpeggio((X+transpose(X,7) ) ) ) ,12) ) ,-7) ,-5) ,7) ) ) ) +transpose(transpose(transpose(shuffle(arpeggio(echo(((X+transpose(echo(X,4,6) ,12) ) |arpeggio(transpose(X,4) ) ) ,4,6) ) ) ,-5) ,-7) ,7) ) ,12) ) ,7) ) ,7) ) +transpose((echo(shuffle((((step(((transpose((step(((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(X,-5) ) ,12) +transpose(arpeggio(echo(transpose((X|X) ,-7) ,4,6) ) ,12) ) ,-7) |echo(transpose((((X+transpose(step(X,12) ,7) ) +echo(X,4,6) ) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ,-7) ,4,6) ) +(echo(arpeggio(((transpose(transpose(X,-5) ,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ) ,4,6) +transpose(echo(arpeggio(transpose(echo(transpose(X,-7) ,4,6) ,-7) ) ,4,6) ,12) ) ) ,12) +transpose((((((((echo(transpose(X,4) ,4,6) +transpose(transpose(step(X,12) ,-5) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) |(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((shuffle(X) |X) ,12) ) ) ,12) ) +transpose((transpose(arpeggio(step(arpeggio(transpose(X,-7) ) ,12) ) ,4) +transpose(shuffle(step(X,12) ) ,12) ) ,4) ) +transpose(((X+transpose(X,7) ) +transpose((echo(shuffle(X) ,4,6) |((((X+shuffle(X) ) +transpose(X,12) ) +transpose(X,4) ) +transpose(((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) ,7) ) ,7) ) |((transpose(((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose(arpeggio((X+X) ) ,7) ) ,-7) +transpose(shuffle((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) ) ,12) ) +transpose((((transpose((X+transpose((X|X) ,12) ) ,-5) +transpose(transpose(step(step(X,12) ,12) ,-5) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) ,12) ) ) +transpose(((transpose((transpose(shuffle(transpose((((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(X,7) ) ,-7) ) ,-7) +transpose(((X|X) +shuffle(X) ) ,-7) ) ,-5) +transpose(echo(((step(transpose(transpose(arpeggio((transpose(X,-5) +transpose((X|X) ,12) ) ) ,-7) ,-5) ,12) +transpose(transpose(transpose((transpose(X,-7) +transpose(transpose(step(X,12) ,-7) ,7) ) ,-7) ,-7) ,4) ) +transpose(transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ,7) ) ,4,6) ,12) ) |(shuffle(arpeggio(transpose(((X+transpose(X,7) ) +transpose(transpose((step(X,12) |transpose(X,-5) ) ,-7) ,7) ) ,-7) ) ) +transpose((echo(transpose((((transpose((X+transpose(transpose(X,-5) ,12) ) ,4) |shuffle((X+transpose(X,7) ) ) ) +transpose((transpose(X,-5) |transpose(X,-5) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ,4,6) +transpose(transpose(transpose(transpose(transpose(arpeggio(X) ,-5) ,-7) ,-7) ,-7) ,12) ) ,7) ) ) ,7) ) ,4) ) +transpose(shuffle(((transpose(echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) ,-5) +transpose((((echo(X,4,6) +transpose(((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ,4) ) +transpose(transpose(transpose(transpose(X,-7) ,-7) ,-5) ,7) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,4) ) +transpose(step(transpose(transpose((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ,-7) ,-7) ,12) ,7) ) ) ,7) ) |transpose(((transpose(transpose(arpeggio(arpeggio(((transpose(transpose(arpeggio(X) ,-7) ,-7) +transpose(((step(arpeggio(X) ,12) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose(step((X+transpose(arpeggio(X) ,7) ) ,12) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) ,-7) ,-7) +transpose(step(transpose(((transpose(transpose(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) |((X+X) |(X+X) ) ) ,-5) ,-7) +transpose(echo(transpose(echo(X,4,6) ,-5) ,4,6) ,7) ) +transpose(shuffle(shuffle(transpose(arpeggio(X) ,-5) ) ) ,12) ) ,-5) ,12) ,4) ) +transpose(transpose(((transpose(arpeggio(transpose(((X+transpose(X,7) ) +shuffle(X) ) ,-7) ) ,-5) +transpose(((transpose(arpeggio(X) ,-7) |arpeggio((X+X) ) ) +transpose(transpose((X+X) ,4) ,12) ) ,4) ) +transpose((shuffle(step((shuffle(step(X,12) ) +transpose(transpose(X,-7) ,12) ) ,12) ) +transpose(step((transpose(echo(transpose(X,4) ,4,6) ,4) +transpose(transpose(transpose(step(X,12) ,-7) ,-5) ,7) ) ,12) ,7) ) ,7) ) ,-5) ,7) ) ,-5) ) ) ,4,6) +transpose(transpose(((transpose(shuffle(step(transpose(transpose(arpeggio(((X+transpose(transpose(X,-7) ,7) ) +transpose(X,12) ) ) ,-5) ,-7) ,12) ) ,4) +transpose((((transpose(arpeggio(transpose(arpeggio(shuffle((((transpose(X,-5) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) +transpose((X+transpose(X,12) ) ,4) ) ) ) ,-5) ) ,-7) +transpose(transpose(arpeggio((transpose(transpose((echo(transpose(transpose(X,-5) ,-7) ,4,6) +transpose((((X|X) +transpose(X,7) ) |((X+transpose((X+X) ,4) ) +transpose(X,7) ) ) ,7) ) ,-5) ,4) +echo((transpose(transpose(X,-7) ,-5) +transpose((transpose(X,-5) |X) ,12) ) ,4,6) ) ) ,-7) ,4) ) +transpose(echo(arpeggio((transpose(shuffle((echo(X,4,6) +transpose(X,7) ) ) ,-5) +transpose(transpose(transpose(X,-7) ,-5) ,-7) ) ) ,4,6) ,7) ) |(shuffle(transpose(transpose(step(echo(((transpose(arpeggio((transpose(X,-5) +transpose(X,12) ) ) ,-7) +transpose(transpose((X+transpose(arpeggio(X) ,7) ) ,-7) ,4) ) +transpose(step((X|X) ,12) ,7) ) ,4,6) ,12) ,4) ,4) ) +transpose(echo((transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose((transpose((X+transpose(X,12) ) ,-7) |arpeggio(X) ) ,7) ) ) ,-5) ,4) |echo(((step(step((X+transpose(X,7) ) ,12) ,12) +transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ,4) ,4) ) +transpose(((X+X) |transpose(X,4) ) ,7) ) ,4,6) ) ,4,6) ,12) ) ) ,4) ) +transpose(transpose((step(((X+transpose(X,12) ) +transpose(shuffle(transpose(((step(X,12) |echo(X,4,6) ) +transpose((X+X) ,7) ) ,-5) ) ,12) ) ,12) +transpose(((step((step(transpose((shuffle(X) +transpose(X,12) ) ,-5) ,12) +transpose(shuffle(X) ,12) ) ,12) +transpose(step(transpose((echo(step(transpose(X,-5) ,12) ,4,6) +transpose(arpeggio(X) ,12) ) ,-7) ,12) ,4) ) +transpose(((shuffle(shuffle(X) ) +transpose((shuffle((transpose((X+X) ,4) +transpose(X,7) ) ) |((((step(X,12) |(X|X) ) +transpose(echo(X,4,6) ,12) ) +transpose(((X+transpose(X,12) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ) ,12) ) +transpose((shuffle(X) |(X+transpose(((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(echo(X,4,6) ,7) ) |((X|X) +transpose((X+X) ,12) ) ) ,12) ) ) ,12) ) ,7) ) ,7) ) ,4) ,7) ) ,4) ,7) ) ,12) ) ,-5)
random seed used was 241572845

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