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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# of Tracks:
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After 15 generations the expression "X" became this:
(transpose(transpose((((echo(echo(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4,6) ,4,6) +transpose(transpose(echo(transpose(transpose(echo(X,4,6) ,4) ,-7) ,4,6) ,4) ,12) ) +transpose((step(transpose((transpose(echo((((step(X,12) +transpose(arpeggio(X) ,12) ) +transpose(transpose(X,-7) ,4) ) +transpose((echo(X,4,6) +transpose(X,7) ) ,7) ) ,4,6) ,-5) +transpose((transpose(transpose(arpeggio(X) ,-5) ,-5) +transpose((transpose(X,4) +transpose(X,-5) ) ,7) ) ,12) ) ,4) ,12) +transpose(transpose(((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(step(transpose(transpose(X,-7) ,4) ,12) ,-5) ,12) ) ,4) +transpose(arpeggio(((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,-7) ) ) ,4) ) +transpose(transpose((X+transpose(transpose((transpose(X,-7) +transpose(arpeggio(X) ,7) ) ,-7) ,12) ) ,-5) ,7) ) ,-7) ,12) ) ,4) ) +transpose(transpose(arpeggio(transpose((((step((((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(echo(X,4,6) ,7) ) ,12) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,-7) ) ,-7) ,7) ) ,-7) ,-5) +transpose(arpeggio(arpeggio(((transpose(transpose(transpose(arpeggio(shuffle((X+transpose(X,7) ) ) ) ,-5) ,-7) ,-5) +transpose((((transpose(transpose(step((shuffle(X) |(X+transpose(X,12) ) ) ,12) ,-5) ,4) +transpose(transpose(((((X+X) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,4) ) +transpose(((shuffle(shuffle(transpose(X,-5) ) ) +transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,12) ,12) ) +transpose(shuffle(((transpose((transpose(X,-5) +transpose(step(X,12) ,12) ) ,-7) +transpose(transpose((X+X) ,4) ,4) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ,7) ) ) ,7) ) ,7) ) +transpose(echo(transpose(transpose(((((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(((shuffle(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose((transpose(X,-5) |echo(X,4,6) ) ,7) ) ,7) ) ,-7) ,4) ,4,6) ,7) ) ,7) ) |shuffle((transpose(((step(transpose(X,4) ,12) +transpose((echo((X|echo(X,4,6) ) ,4,6) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ,4) ) +transpose(transpose(((((X|X) +transpose(X,12) ) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,4) ,7) ) ,4) |echo(transpose(((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ,4,6) ) ) ) ) ) ,7) )
random seed used was 9 EXPR = (transpose((echo((transpose(transpose(transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-5) ,-5) ,-5) +transpose((X|transpose(((transpose(X,-7) +transpose(transpose((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ,4) ,4) ) +transpose(((X+transpose(X,12) ) |((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ,-7) ) ,7) ) ,4,6) +transpose(echo((arpeggio(((transpose(transpose(step(transpose(X,4) ,12) ,-7) ,4) +transpose(step(((((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) +transpose((step(arpeggio(X) ,12) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose((transpose((X+X) ,-7) +transpose((X|X) ,7) ) ,7) ) +transpose(transpose(shuffle((transpose(X,-5) +X) ) ,-7) ,7) ) ,12) ,12) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ) |(step((arpeggio(step(shuffle((transpose(X,4) +transpose(X,12) ) ) ,12) ) +transpose(((transpose(shuffle(X) ,-5) +transpose((arpeggio(transpose(X,-5) ) +transpose(((transpose(X,-5) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(shuffle((X+transpose(X,4) ) ) ,7) ) ,7) ) ,12) +transpose(transpose(transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,4) ,-5) ,12) ) ) ,4,6) ,7) ) ,4) +(((((transpose(arpeggio(arpeggio(X) ) ,-5) +transpose(transpose(transpose(echo(step((X+transpose(X,12) ) ,12) ,4,6) ,-5) ,4) ,7) ) +transpose((shuffle((X+transpose(X,7) ) ) +transpose(shuffle((((((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose(X,-7) ,7) ) +transpose((X+transpose(transpose(transpose(X,4) ,-7) ,7) ) ,4) ) +transpose(transpose(shuffle(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(step(X,12) ,12) ) ) ,4) ,7) ) ) ,7) ) ,7) ) +echo(transpose(transpose((((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ,-7) ,4) ,4,6) ) +transpose(((((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-7) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,4) ) +transpose(((echo(arpeggio(transpose(X,-7) ) ,4,6) +transpose(arpeggio(step(X,12) ) ,12) ) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ,7) ) ,7) ) +transpose(transpose(echo(arpeggio(transpose(((transpose(X,-5) +transpose(((arpeggio(X) +transpose(transpose(X,4) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,4) ) +transpose(echo(arpeggio(transpose(X,-7) ) ,4,6) ,7) ) ,-5) ) ,4,6) ,-7) ,4) ) +transpose(step((transpose(transpose(((X+transpose(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,-5) +transpose(shuffle(((transpose((X+X) ,4) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) +transpose(transpose(X,4) ,12) ) ) ,7) ) ,12) ,7) ) ,12) ) +transpose(transpose((step(arpeggio((((echo(X,4,6) +transpose(X,7) ) +transpose((transpose(X,-5) |X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,12) +transpose(arpeggio(arpeggio((((shuffle(((X+X) +X) ) +((X+transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) |(arpeggio(X) |echo(X,4,6) ) ) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ,12) ) +transpose((transpose(shuffle(X) ,-7) +transpose(((step(X,12) +shuffle(echo(X,4,6) ) ) +transpose(((X|echo(X,4,6) ) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) ,7) ) ,7) ) ,7) ) ) ) ,7) ) ,-5) ,7) ) )
random seed used was 0 EXPR = transpose(transpose((echo(transpose(transpose(transpose(transpose(shuffle((X+transpose(X,12) ) ) ,4) ,-5) ,4) ,4) ,4,6) +transpose(transpose(transpose(transpose(step(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) ) ,12) ,-5) ,-7) ,4) ,7) ) ,4) ,4)
random seed used was 0 EXPR = transpose(transpose(((transpose((transpose(transpose(step(transpose(echo(transpose(((X+transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) ,-5) ,4,6) ,-5) ,12) ,4) ,4) |transpose((((((transpose(transpose((arpeggio(X) +echo(transpose(X,4) ,4,6) ) ,4) ,-7) +transpose((transpose((X+transpose((X|(X+X) ) ,7) ) ,-5) |((((echo(X,4,6) |X) +transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4) ,7) ) +transpose(shuffle((X+transpose(X,7) ) ) ,12) ) ) ,4) ) +transpose((transpose(transpose(arpeggio(X) ,-7) ,-7) |transpose((((X+transpose(transpose(X,-7) ,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,4) ) ,7) ) +transpose(shuffle((X|transpose(transpose(X,4) ,4) ) ) ,7) ) +transpose((transpose(((transpose(transpose(transpose(X,-5) ,-5) ,4) |transpose(step((transpose(X,-7) +transpose(transpose(X,4) ,12) ) ,12) ,-7) ) +transpose((transpose(transpose(X,-5) ,-7) +transpose(transpose(transpose(transpose(X,-7) ,-7) ,-7) ,12) ) ,12) ) ,-5) +transpose(((transpose(shuffle((X+X) ) ,-5) +transpose((((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) +transpose(((transpose(X,-5) +transpose(shuffle(X) ,4) ) +transpose((arpeggio(X) +transpose((X|X) ,12) ) ,7) ) ,4) ) +transpose(shuffle(shuffle(transpose(X,-7) ) ) ,7) ) ,4) ) +transpose(step(step(transpose(X,4) ,12) ,12) ,7) ) ,12) ) ,4) ) +transpose(transpose(transpose(transpose((shuffle((X+X) ) +transpose(X,4) ) ,-5) ,-7) ,4) ,7) ) ,4) ) ,-5) +transpose(transpose(echo((transpose(transpose(X,-5) ,4) |step((X+transpose(X,-7) ) ,12) ) ,4,6) ,4) ,4) ) +transpose(transpose((arpeggio(arpeggio(((((X+transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) |(transpose(X,4) +transpose(X,12) ) ) +transpose(transpose(shuffle(shuffle(X) ) ,4) ,12) ) ) ) +step(arpeggio(step(shuffle(X) ,12) ) ,12) ) ,-5) ,7) ) ,4) ,-5)
random seed used was 0

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