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

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