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:
Randomize seed:
Generations:
Phrase for X:
# of Tracks:
Randomize patches:
 

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After 20 generations the expression "X" became this:
echo(((shuffle(((((((shuffle(transpose(transpose(echo(step(X,12) ,4,6) ,-7) ,-5) ) +transpose((transpose(shuffle(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ) ,-5) +transpose(((X+transpose(X,12) ) +(transpose(transpose(X,-5) ,4) +transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ) ,12) ) ,12) ) |echo(echo((X|X) ,4,6) ,4,6) ) +transpose(step(shuffle(transpose((X+transpose(transpose((X+X) ,4) ,7) ) ,4) ) ,12) ,7) ) +transpose(((echo(transpose(((transpose(X,4) +transpose((X+transpose(X,12) ) ,12) ) |transpose(echo(shuffle(X) ,4,6) ,4) ) ,4) ,4,6) +transpose(transpose(((transpose((arpeggio(transpose((X+transpose(X,7) ) ,-7) ) |shuffle(transpose(step(X,12) ,-7) ) ) ,-7) +transpose((shuffle(X) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(arpeggio(transpose((X+((transpose(X,-7) +transpose(X,4) ) +transpose((X+X) ,7) ) ) ,-7) ) ,7) ) ,4) ,4) ) +transpose(transpose(transpose(step(transpose((X+(X+transpose(X,12) ) ) ,4) ,12) ,4) ,-5) ,7) ) ,4) ) +transpose(transpose(((((((X+transpose(transpose((X|X) ,-5) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) +(((X|X) |transpose(X,-7) ) |transpose(X,4) ) ) +transpose(transpose(X,-5) ,7) ) +transpose(((((transpose(X,4) +transpose(step(X,12) ,7) ) +transpose(shuffle(X) ,4) ) +transpose(((transpose(transpose(X,4) ,-7) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose((X|X) ,7) ) ,7) ) |transpose((X|X) ,4) ) ,12) ) |step((transpose((transpose(X,4) +transpose(X,7) ) ,-7) |(X+(echo(step(X,12) ,4,6) +transpose(echo(X,4,6) ,-5) ) ) ) ,12) ) ,-7) ,7) ) +transpose((transpose(step(transpose(step(transpose((X+transpose(X,12) ) ,-7) ,12) ,-5) ,12) ,-5) |echo((((((X+transpose(X,4) ) +transpose(X,7) ) +echo(transpose(X,4) ,4,6) ) +(X|transpose((X+transpose(X,7) ) ,-5) ) ) +arpeggio(arpeggio((X+transpose(X,12) ) ) ) ) ,4,6) ) ,12) ) ) +transpose(((((echo(step((((X+transpose(X,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ,4) ) +transpose(step(arpeggio(X) ,12) ,7) ) ,12) ,4,6) +(step((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ,12) +((((transpose(X,4) +transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose((X|(X+transpose(X,12) ) ) ,7) ) +transpose(shuffle((arpeggio(X) |X) ) ,7) ) |((transpose(shuffle(X) ,4) |shuffle(X) ) +transpose(transpose(transpose(X,-5) ,-7) ,-5) ) ) ) ) |transpose((((((transpose(transpose(X,4) ,4) +transpose(((transpose(transpose(X,4) ,-5) +transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose(shuffle((arpeggio(X) +transpose(X,12) ) ) ,-7) ,4) ) +transpose((echo((((X|(X|X) ) +transpose(((X|X) +(X+transpose(X,12) ) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) +transpose(step(X,12) ,7) ) ,7) ) +transpose(transpose((transpose(transpose(step(echo(X,4,6) ,12) ,4) ,-7) |((transpose(X,-5) +transpose((((X+transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) |(X|(X|X) ) ) ,7) ) +transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,12) ,12) ) ) ,-7) ,4) ) +transpose((transpose(arpeggio((X+transpose(X,-7) ) ) ,4) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) ,7) ) ,-5) ) +transpose((echo(echo((shuffle(transpose((X|X) ,-7) ) +transpose(X,7) ) ,4,6) ,4,6) |(((transpose((((X+transpose(transpose(X,-7) ,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ,-5) |((step(transpose((transpose(step(X,12) ,4) +transpose(transpose(X,-7) ,7) ) ,-7) ,12) |transpose(transpose(transpose(X,-5) ,4) ,-5) ) +transpose(echo(arpeggio(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) ,4,6) ,12) ) ) +transpose(shuffle(((arpeggio(X) |transpose((X+transpose(X,12) ) ,-7) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) ,12) ) +transpose(transpose((transpose(transpose(shuffle(transpose((X|X) ,-5) ) ,4) ,-5) +transpose(((echo(transpose(transpose((X|X) ,4) ,4) ,4,6) +transpose(echo(echo(echo(X,4,6) ,4,6) ,4,6) ,4) ) +transpose((((((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) +transpose(arpeggio(transpose(X,-5) ) ,12) ) |transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |X) ,4) ) ,7) ) ,7) ) ,4) ,7) ) ) ,7) ) +transpose((echo(((transpose(transpose(arpeggio(transpose((echo(X,4,6) +transpose(X,12) ) ,-5) ) ,-5) ,4) |transpose((((echo(X,4,6) +arpeggio(X) ) +transpose((echo(X,4,6) |X) ,7) ) +transpose(transpose(((X+shuffle(X) ) +transpose(transpose((X+X) ,-5) ,7) ) ,-5) ,7) ) ,-7) ) +transpose(echo(step(transpose(X,-7) ,12) ,4,6) ,12) ) ,4,6) +transpose(((transpose(transpose((transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,4) +transpose(X,7) ) ,-5) ,-5) +transpose(echo(transpose((transpose(echo(X,4,6) ,-7) |(shuffle(transpose(transpose(X,-7) ,-7) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ) ,-7) ,4,6) ,12) ) +(((transpose(transpose(((transpose(transpose((X|X) ,4) ,-5) +transpose((transpose(step((X+transpose(X,12) ) ,12) ,-5) +transpose(step(((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ,12) ,12) ) ,4) ) +transpose((echo(arpeggio(X) ,4,6) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,7) ) ,4) ,-7) +transpose(transpose(transpose((arpeggio(shuffle(step(X,12) ) ) +transpose((X+transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,7) ) ,-5) ,-5) ,4) ) +transpose((step(((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) +transpose(transpose(transpose(transpose((X|X) ,-7) ,-7) ,-5) ,4) ) +transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) ,7) ) ,12) |transpose((transpose(arpeggio(transpose(X,-5) ) ,4) +step(arpeggio(X) ,12) ) ,-7) ) ,7) ) |echo((((transpose(X,-7) +transpose((shuffle((((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +transpose((transpose(X,4) +transpose(transpose(X,4) ,7) ) ,12) ) ) +transpose(((X+X) +transpose(X,7) ) ,7) ) ,4) ) +transpose((transpose((transpose(X,4) |(X+transpose(X,7) ) ) ,-5) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ,7) ) +transpose(step(shuffle((transpose(X,-7) +transpose((X+X) ,12) ) ) ,12) ,12) ) ,4,6) ) ) ,12) ) ,12) ) ,7) ) +transpose(step(shuffle(transpose((transpose(transpose(transpose(echo(arpeggio((((X|X) +echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ,7) ) ) ,4,6) ,-7) ,-5) ,4) |transpose(echo(transpose(((echo(X,4,6) +transpose(X,12) ) +transpose(step(X,12) ,12) ) ,-7) ,4,6) ,-5) ) ,-7) ) ,12) ,12) ) ,4,6)
random seed used was 257110772

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