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 16 generations the expression "X" became this:
shuffle(((step(step(transpose(echo((echo(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,12) ,4,6) +((transpose(transpose(X,-7) ,-5) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ) ,4,6) ,4) ,12) ,12) +transpose(echo((echo((arpeggio((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(arpeggio(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) ,12) ) ,4,6) |(step(shuffle(step(step(X,12) ,12) ) ,12) +((((X+transpose(X,7) ) |(transpose(X,-7) +X) ) +transpose((transpose(shuffle(X) ,4) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) ,4,6) ,4) ) +transpose((((((transpose(((step(transpose(shuffle((X+transpose(X,7) ) ) ,-7) ,12) +transpose(arpeggio(arpeggio((((((((transpose(X,4) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(shuffle((echo(X,4,6) +transpose(X,4) ) ) ,7) ) +transpose(arpeggio(step(transpose((X+transpose(X,12) ) ,-5) ,12) ) ,4) ) +transpose((step(echo(echo(X,4,6) ,4,6) ,12) |arpeggio(step((X|X) ,12) ) ) ,7) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose((X|(shuffle(X) +shuffle(X) ) ) ,7) ) ,7) ) ) ) ,4) ) +transpose(shuffle((X|X) ) ,7) ) ,-7) +transpose((step(((((shuffle(step((X+X) ,12) ) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) +transpose(((step(X,12) +X) +echo(transpose(arpeggio(X) ,4) ,4,6) ) ,4) ) +transpose(arpeggio((arpeggio(X) +X) ) ,7) ) ,12) +((transpose(step(echo(((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,4,6) ,12) ,4) +transpose((step(transpose((shuffle(X) +((X+transpose(X,4) ) +transpose((X+X) ,7) ) ) ,4) ,12) +transpose(transpose(shuffle(shuffle(echo(X,4,6) ) ) ,-5) ,12) ) ,4) ) +transpose(transpose(arpeggio(((shuffle(X) |X) +transpose(transpose(X,-5) ,12) ) ) ,4) ,7) ) ) ,-5) ) +transpose(echo(step(arpeggio((((echo(arpeggio(transpose(step(X,12) ,-7) ) ,4,6) +transpose(arpeggio(X) ,12) ) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose(((shuffle(((X+X) |shuffle(X) ) ) +transpose(arpeggio(transpose(arpeggio(X) ,-7) ) ,4) ) +transpose(((shuffle(((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose((X+X) ,7) ) ) +transpose(arpeggio(shuffle(arpeggio(X) ) ) ,4) ) +transpose((X+X) ,7) ) ,7) ) ,7) ) ) ,12) ,4,6) ,4) ) +transpose(((transpose((step(echo((X+transpose(X,7) ) ,4,6) ,12) |((transpose(echo(echo(((X+X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,4,6) ,-7) +transpose(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,-7) ) |transpose(transpose(transpose(((((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose(step(X,12) ,7) ) +transpose(shuffle(X) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,7) ) ,-5) ,-7) ,4) ) ) ,-7) |((X+transpose((((X|X) +transpose(step(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ,4) ) +transpose(((echo(X,4,6) +X) +transpose(transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,-5) ,12) ) ,7) ) ,7) ) |transpose(shuffle(step(arpeggio(shuffle((X+transpose(X,7) ) ) ) ,12) ) ,4) ) ) |echo(shuffle(echo((transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-7) |(arpeggio(echo(X,4,6) ) |echo((arpeggio(X) |X) ,4,6) ) ) ,4,6) ) ,4,6) ) ,7) ) +transpose(echo(arpeggio(shuffle(shuffle(echo((((transpose(X,4) |((X+transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose(((X+X) +transpose(transpose(X,4) ,12) ) ,7) ) ) +transpose(transpose(((X+((X+transpose(X,4) ) +transpose(X,7) ) ) |((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4) ,4) ) +transpose((shuffle(arpeggio(X) ) +transpose(shuffle(step(X,12) ) ,7) ) ,7) ) ,4,6) ) ) ) ,4,6) ,4) ) +transpose(step(arpeggio(transpose(echo((arpeggio((arpeggio(step(X,12) ) +transpose(((arpeggio(echo((X+X) ,4,6) ) +transpose(((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(X,7) ) ,7) ) ) +shuffle(echo(arpeggio((arpeggio(arpeggio(X) ) |arpeggio((X+X) ) ) ) ,4,6) ) ) ,4,6) ,4) ) ,12) ,7) ) ,7) ) )
random seed used was 234792112 EXPR = (transpose(arpeggio(transpose(transpose(transpose(shuffle(transpose((X+X) ,4) ) ,-7) ,-5) ,-7) ) ,-7) +transpose(transpose(step(shuffle(transpose(step(arpeggio(((echo((echo(X,4,6) +transpose(step(X,12) ,12) ) ,4,6) +transpose(echo(transpose(step((X+X) ,12) ,4) ,4,6) ,-5) ) +arpeggio(transpose((transpose(X,4) +transpose((X+X) ,12) ) ,4) ) ) ) ,12) ,-7) ) ,12) ,-5) ,7) )
random seed used was 0 EXPR = arpeggio(((echo((((arpeggio(transpose(X,4) ) +transpose(((((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4) ) +transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,12) ) ,7) ) +((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +(arpeggio(shuffle(arpeggio(step(X,12) ) ) ) |(shuffle(transpose(X,-7) ) |(((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ) ) ) ,4,6) +transpose((echo(arpeggio(((transpose(shuffle(step((X+transpose((X+transpose(X,7) ) ,12) ) ,12) ) ,-7) |step((X+transpose(shuffle(X) ,7) ) ,12) ) +transpose(((shuffle(arpeggio(arpeggio(echo(X,4,6) ) ) ) +transpose(echo((arpeggio(X) +shuffle(echo(X,4,6) ) ) ,4,6) ,4) ) +transpose(echo(((shuffle(X) +X) +step((arpeggio(X) +X) ,12) ) ,4,6) ,7) ) ,-5) ) ) ,4,6) |echo(step(arpeggio(((arpeggio(arpeggio(transpose(step(((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ,-7) ) ) +transpose(transpose((transpose(transpose((transpose(X,-7) +step(echo(X,4,6) ,12) ) ,-5) ,-7) +transpose(echo(echo((step(X,12) +transpose(step(X,12) ,12) ) ,4,6) ,4,6) ,7) ) ,4) ,4) ) +transpose((step((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) +echo(shuffle(transpose(X,-5) ) ,4,6) ) ,7) ) ) ,12) ,4,6) ) ,4) ) +transpose(((arpeggio(transpose((transpose(transpose(transpose(X,4) ,-5) ,-7) +step((((arpeggio(X) +transpose(((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) +shuffle(echo((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ) ) ,12) ) ,-7) ) +transpose(transpose(step(((shuffle(shuffle(step(shuffle(step(X,12) ) ,12) ) ) +transpose(step(echo(echo(transpose(arpeggio(X) ,-5) ,4,6) ,4,6) ,12) ,4) ) +transpose((arpeggio(step(transpose(arpeggio(X) ,4) ,12) ) |((shuffle(transpose((((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(step(X,12) ,12) ) ,-5) ) +transpose(arpeggio(((X+transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) +transpose(X,7) ) ) ,7) ) |((((transpose(X,-7) +transpose((shuffle(X) |shuffle(X) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,7) ) +transpose(step(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(arpeggio(echo(((X|X) +X) ,4,6) ) ,7) ) ) ) ,7) ) ,12) ,-7) ,4) ) +transpose(((echo((arpeggio(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose((shuffle(X) +transpose(transpose((X+X) ,4) ,12) ) ,7) ) ) +transpose(((((((transpose(X,-5) |transpose(arpeggio(X) ,-5) ) +transpose(echo((X|X) ,4,6) ,7) ) +transpose(shuffle(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((X+transpose(echo(X,4,6) ,12) ) ,7) ) ) ,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) +transpose(echo(step(X,12) ,4,6) ,7) ) ,7) ) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose(step(transpose(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,12) ,7) ) ,12) ) ,4,6) +transpose(step(((arpeggio((step((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |transpose(X,-7) ) ,12) +transpose(step(((X+(X+X) ) +X) ,12) ,12) ) ) +transpose((arpeggio(transpose(X,-5) ) +transpose(shuffle(step(X,12) ) ,7) ) ,4) ) +transpose(((((step(transpose(shuffle(X) ,-5) ,12) +transpose((step((X+X) ,12) |step(transpose(X,-7) ,12) ) ,4) ) +transpose((((transpose((X+transpose(X,12) ) ,4) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(X,-7) ) ,7) ) +transpose(((X+(transpose(X,-7) +transpose(transpose(X,-7) ,12) ) ) |(((arpeggio(X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) +transpose(arpeggio(step(step(X,12) ,12) ) ,4) ) +transpose((transpose(transpose(X,-5) ,4) +shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) ) ,4) ) +transpose((((transpose(X,4) +(X+transpose(X,7) ) ) +transpose(step(X,12) ,12) ) +transpose(shuffle(shuffle(X) ) ,12) ) ,7) ) ,7) ) ,12) ,4) ) +transpose((arpeggio(transpose(shuffle(X) ,-7) ) |((echo(((X+transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose(X,7) ) ,4,6) +transpose((arpeggio(X) +arpeggio((transpose(X,4) +X) ) ) ,4) ) +transpose(shuffle(step(shuffle((X+transpose(X,7) ) ) ,12) ) ,7) ) ) ,7) ) ,7) ) ,7) ) )
random seed used was 0 EXPR = echo(shuffle(arpeggio(transpose((echo(((transpose(echo(transpose(X,-7) ,4,6) ,-5) +transpose(shuffle(step(X,12) ) ,7) ) +shuffle(shuffle(shuffle(shuffle(X) ) ) ) ) ,4,6) +transpose(echo(((shuffle(transpose(X,4) ) +transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(X) ) ,4,6) ,4) ) +transpose(shuffle(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,7) ) ,4,6) ,-5) ) ,4) ) ) ,4,6)
random seed used was 0

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