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:
Randomize patches:
 

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After 19 generations the expression "X" became this:
((transpose(transpose(transpose(transpose(echo((echo((transpose(X,4) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) ,4,6) +transpose((((((transpose(X,4) |transpose(X,-7) ) +transpose(transpose(arpeggio(echo(X,4,6) ) ,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose(((transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) +transpose(shuffle(arpeggio(step(transpose(transpose(X,4) ,-5) ,12) ) ) ,4) ) +transpose(shuffle(((arpeggio(transpose((X+transpose(X,7) ) ,-5) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((transpose((X+transpose(X,7) ) ,4) +transpose(X,12) ) ,7) ) ) ,7) ) ,12) ) ,7) ) ,4,6) ,4) ,-5) ,-7) ,-5) +transpose((transpose(((transpose(step(arpeggio(shuffle(shuffle(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ) ) ) ,12) ,-5) +transpose((transpose(transpose(transpose(echo(X,4,6) ,-5) ,-5) ,4) +transpose((echo((((echo((X+transpose(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) ,12) ) ,4,6) |transpose(transpose(X,-5) ,-5) ) +transpose(transpose(transpose(((X|transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ,4) ) +transpose(shuffle((((X+transpose((transpose(X,-7) +X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(echo(transpose((X|X) ,4) ,4,6) ,7) ) ) ,7) ) ,4,6) +transpose(transpose((transpose(((X+X) +transpose((X+transpose(X,12) ) ,12) ) ,-7) +transpose(((X+transpose(arpeggio((X+X) ) ,4) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) ,12) ) ,-7) ,-7) ) ,12) ) ,12) ) +transpose(transpose(((((transpose(transpose(shuffle(X) ,-7) ,-5) |(((transpose(X,-5) +transpose((shuffle(X) +transpose(shuffle(X) ,12) ) ,7) ) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ) +transpose(((arpeggio(echo(X,4,6) ) +transpose(((transpose(arpeggio(X) ,-7) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +(X|transpose(X,-5) ) ) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) +transpose((X+transpose(transpose(X,-7) ,7) ) ,7) ) ,4) ) +transpose(((transpose((transpose((transpose(X,-7) |transpose(X,-7) ) ,-5) +transpose(transpose(transpose(X,4) ,-7) ,12) ) ,4) +transpose(step(arpeggio((transpose(transpose(X,-7) ,-5) +transpose(echo(X,4,6) ,-5) ) ) ,12) ,4) ) +transpose(((X|transpose(X,4) ) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) |step(X,12) ) ,12) ) ,7) ) ,7) ) |(X+transpose(transpose(X,4) ,12) ) ) ,-5) ,7) ) ,-7) +transpose(transpose(step(((transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +(((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) +transpose(step(((shuffle(transpose(X,-5) ) +transpose(transpose(X,4) ,4) ) +transpose(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,12) ,4) ) +transpose(transpose((transpose(X,-5) +transpose((X+transpose(transpose(X,4) ,12) ) ,7) ) ,4) ,7) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ) ,-7) +((transpose((transpose(X,4) |transpose(X,4) ) ,-5) +transpose((((((transpose(X,4) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(transpose((step(X,12) +transpose((X+transpose(X,12) ) ,12) ) ,-5) ,4) ,4) ) +transpose(step(X,12) ,7) ) +(echo((X+transpose(X,12) ) ,4,6) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,12) ) ) +transpose(echo(step(arpeggio(X) ,12) ,4,6) ,7) ) ,4) ) +transpose(transpose(transpose(arpeggio(transpose(X,-5) ) ,-5) ,-7) ,7) ) ) +transpose(step(transpose(echo(step(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,12) ,4,6) ,-7) ,12) ,12) ) ,12) ,-5) ,12) ) ,7) ) +transpose((transpose((echo(transpose(transpose((transpose(shuffle(transpose(step(transpose(X,4) ,12) ,4) ) ,4) +transpose(((((arpeggio(X) +transpose(echo(arpeggio((X+transpose(X,7) ) ) ,4,6) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) +transpose(transpose(transpose(transpose(shuffle(echo(X,4,6) ) ,4) ,4) ,-5) ,4) ) +transpose((step((transpose(X,-7) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) ,12) +transpose((((shuffle(transpose(X,4) ) +transpose(step((X+transpose(X,7) ) ,12) ,12) ) |transpose(transpose(X,4) ,-5) ) +transpose(transpose(step(transpose(X,4) ,12) ,-5) ,7) ) ,12) ) ,7) ) ,7) ) ,4) ,-5) ,4,6) |transpose(((((step(transpose(echo(((echo(X,4,6) +transpose(X,7) ) +echo(transpose(X,-5) ,4,6) ) ,4,6) ,-5) ,12) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose(transpose(shuffle(arpeggio(transpose((echo(X,4,6) |X) ,-7) ) ) ,-7) ,7) ) +transpose((transpose(((transpose(transpose(X,-7) ,-7) +transpose(((arpeggio(X) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,7) ) ,12) ) +(X+((echo(X,4,6) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) ) ,-5) +transpose(transpose(((((X|step(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) |(transpose(step(arpeggio(X) ,12) ,-5) +transpose((transpose(X,-5) +transpose(X,-5) ) ,12) ) ) ,-5) ,12) ) ,7) ) +transpose(echo((step((X|transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,12) |shuffle(transpose(arpeggio(shuffle(transpose(X,4) ) ) ,4) ) ) ,4,6) ,12) ) ,-5) ) ,-7) |step(((transpose((echo((echo((X+transpose(transpose(X,4) ,-5) ) ,4,6) +transpose(echo(arpeggio(shuffle(transpose(X,4) ) ) ,4,6) ,7) ) ,4,6) +transpose((arpeggio((transpose((echo(transpose(X,-5) ,4,6) +transpose(X,-5) ) ,-5) +transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,4,6) ,12) ) ) +transpose(transpose((transpose(echo(X,4,6) ,-5) +transpose(transpose((transpose(transpose(X,-5) ,-7) +transpose(transpose(X,-5) ,7) ) ,4) ,12) ) ,4) ,-7) ) ,7) ) ,4) |transpose(transpose(transpose(transpose(shuffle(shuffle(transpose((((step(X,12) +transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) ,7) ) +transpose(X,7) ) ,-5) ) ) ,-7) ,-5) ,-5) ,-7) ) +(transpose((transpose((step(transpose(shuffle(echo(X,4,6) ) ,-7) ,12) +transpose(arpeggio(transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) ,7) ) ,4) +transpose(transpose(transpose(step(transpose(((((step(X,12) +transpose(X,7) ) |transpose(X,-7) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) ,-7) ,12) ,-5) ,-7) ,7) ) ,4) +transpose(transpose((((arpeggio(transpose(transpose(X,4) ,-5) ) +transpose(step(arpeggio(transpose((transpose(echo(X,4,6) ,-5) +transpose((X+X) ,12) ) ,-5) ) ,12) ,12) ) +transpose(transpose(transpose(((((((transpose(step(transpose(X,-7) ,12) ,4) +transpose((arpeggio(X) |transpose(X,-7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(step(X,12) ,4) ,12) ) +transpose((transpose(transpose(X,4) ,-5) +transpose((echo(transpose(X,4) ,4,6) +transpose((transpose(X,-7) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,12) ) ,7) ) ,4) ) +transpose(((shuffle(echo(transpose(X,-5) ,4,6) ) +transpose(transpose(transpose(transpose(X,-7) ,-7) ,4) ,4) ) +transpose(shuffle((((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(X,7) ) ) ,7) ) ,7) ) +transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,12) ) ,-7) ,4) ,4) ) +transpose(transpose(transpose(((((echo(X,4,6) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(((echo((X+X) ,4,6) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ,7) ) ,12) ) +transpose((arpeggio(((X+transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose((shuffle(X) +step(transpose(X,-7) ,12) ) ,7) ) ,4) ,-5) ,7) ) ,-7) ,7) ) ) ,12) ) ,12) )
random seed used was 124694813

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