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 20 generations the expression "X" became this:
(transpose(((transpose((((arpeggio((echo(shuffle(((((X+transpose(X,7) ) +transpose(X,12) ) +transpose((X+transpose(shuffle(X) ,7) ) ,12) ) +transpose(((((X|X) +transpose(step(X,12) ,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,7) ) ) ,4,6) +transpose(transpose(((((X+transpose(X,7) ) +transpose(((X+X) +transpose(step(X,12) ,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +echo((X+transpose(transpose(X,-7) ,7) ) ,4,6) ) ,4) ,12) ) ) +transpose(((echo(((step((echo(X,4,6) |transpose(X,-7) ) ,12) +transpose((transpose(X,-7) +(X+transpose(X,7) ) ) ,7) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,4,6) +transpose((transpose(echo(echo(X,4,6) ,4,6) ,-7) +transpose(arpeggio(transpose(transpose(X,-7) ,-7) ) ,7) ) ,4) ) +transpose((transpose(transpose((((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) +transpose(step(transpose(shuffle(X) ,4) ,12) ,4) ) +transpose((((X|(X+transpose(X,7) ) ) +transpose(((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,-7) ,-5) +step(step(step(transpose(X,-5) ,12) ,12) ,12) ) ,7) ) ,4) ) +transpose(((((transpose(step(step(shuffle(X) ,12) ,12) ,-5) +transpose((arpeggio(X) +transpose(X,7) ) ,4) ) +transpose(echo(echo(echo((X+X) ,4,6) ,4,6) ,4,6) ,7) ) +transpose(step(((transpose(step(((shuffle((X+transpose(X,7) ) ) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ,4) +transpose(arpeggio((((step(transpose(step(X,12) ,-5) ,12) +transpose((((X+transpose(X,7) ) +transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose((X+arpeggio(echo(X,4,6) ) ) ,7) ) |((shuffle(X) +transpose((X+transpose(X,7) ) ,7) ) +step(X,12) ) ) ) ,4) ) +transpose((step(((step((X+transpose(transpose(X,-7) ,7) ) ,12) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose(X,7) ) ,12) +shuffle(arpeggio(shuffle(X) ) ) ) ,7) ) ,12) ,4) ) +transpose(transpose(((shuffle(echo(echo(((X+X) +transpose(X,4) ) ,4,6) ,4,6) ) +transpose(step(X,12) ,4) ) +transpose(step((step(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) |step(transpose(arpeggio((X+transpose(X,7) ) ) ,4) ,12) ) ,12) ,7) ) ,-7) ,7) ) ,7) ) +transpose((((transpose(arpeggio(((X+X) +transpose(shuffle(X) ,7) ) ) ,-5) +transpose(((echo(transpose(X,4) ,4,6) +transpose(transpose(((X+X) +transpose((X+transpose(X,12) ) ,12) ) ,-5) ,7) ) +transpose(((shuffle(X) +transpose((transpose(X,4) +(X+transpose(X,7) ) ) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,7) ) ,7) ) +transpose(transpose(transpose(((echo((X+X) ,4,6) +transpose(shuffle(X) ,7) ) +(echo(X,4,6) +transpose(X,-5) ) ) ,4) ,-5) ,4) ) +transpose(shuffle((((step(echo(transpose((X+X) ,-5) ,4,6) ,12) |arpeggio(transpose(X,-7) ) ) +transpose((((((X+X) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) +transpose((transpose(X,4) +transpose(X,12) ) ,-7) ) ,7) ) +transpose(((((transpose((X+transpose(X,7) ) ,-5) |((X|X) +transpose(X,7) ) ) +transpose((((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) |X) ,4) ) +transpose(arpeggio(transpose((X+X) ,4) ) ,7) ) +arpeggio(arpeggio(X) ) ) ,7) ) ) ,7) ) ,12) ) ,-5) +transpose(step(arpeggio(((arpeggio(transpose(transpose(echo((transpose(transpose(step(X,12) ,4) ,-7) |arpeggio((transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) ) ) ,4,6) ,4) ,-5) ) +transpose((((transpose(echo(step(X,12) ,4,6) ,4) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose((transpose(X,-7) +X) ,7) ) +transpose(transpose(transpose(shuffle(X) ,-5) ,-5) ,7) ) ,4) ) +transpose(step(shuffle((X|X) ) ,12) ,7) ) +transpose(((step(arpeggio(step((X+X) ,12) ) ,12) +transpose((((transpose(((transpose(shuffle(X) ,4) +transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) +transpose(arpeggio(arpeggio((X|X) ) ) ,7) ) ,-7) |((step(step((X+X) ,12) ,12) |step(X,12) ) +transpose((shuffle(transpose(X,-7) ) |((X|X) +transpose((X+X) ,7) ) ) ,7) ) ) +transpose(transpose(step(arpeggio((X+transpose(transpose(X,4) ,7) ) ) ,12) ,-5) ,4) ) +transpose((arpeggio(((X|X) +transpose(X,-7) ) ) +arpeggio(transpose(transpose(X,-5) ,4) ) ) ,7) ) ,4) ) +transpose((echo(transpose(step(X,12) ,-5) ,4,6) +((echo(X,4,6) +transpose(arpeggio(X) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,7) ) ,7) ) ,4) ) +transpose(((echo(echo(echo(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(((echo(X,4,6) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(step((transpose(X,-5) |(X+transpose(arpeggio(X) ,7) ) ) ,12) ,7) ) ,4,6) ,4,6) ,4,6) +transpose(((echo(transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,4,6) |((X+transpose(X,7) ) +X) ) |(shuffle(step(shuffle(echo(transpose(echo(X,4,6) ,-5) ,4,6) ) ,12) ) +transpose(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,7) ) ) ,4) ) +transpose((((transpose(((X|X) +transpose(arpeggio(X) ,7) ) ,-5) +transpose(((arpeggio(X) |(X+transpose((X+transpose(X,12) ) ,12) ) ) +((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,4) ) +transpose(X,7) ) ) ,7) ) +transpose(shuffle((arpeggio(X) +transpose(step(((X+transpose(X,7) ) +transpose(X,-5) ) ,12) ,7) ) ) ,4) ) +transpose((transpose(X,4) |arpeggio(transpose(transpose(X,-7) ,-5) ) ) ,7) ) ,7) ) ,7) ) ) ,12) ,4) ) +transpose(echo(shuffle(transpose(transpose(step(((transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ,4) +transpose((echo(X,4,6) +transpose(transpose((echo(step(X,12) ,4,6) +transpose(arpeggio(X) ,12) ) ,-7) ,12) ) ,4) ) +transpose(((step((X+transpose(X,7) ) ,12) +transpose((X+(X+X) ) ,4) ) +transpose(arpeggio(transpose((transpose(X,-5) |(X+transpose(X,12) ) ) ,-5) ) ,7) ) ,7) ) ,12) ,4) ,-5) ) ,4,6) ,7) ) ,4) +transpose(arpeggio(transpose(arpeggio((((transpose(transpose(arpeggio(((((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((transpose(X,4) |X) ,4) ) +transpose(((transpose(shuffle(X) ,-7) +transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) +transpose(step(((echo(X,4,6) +transpose(((X+X) +transpose(X,7) ) ,7) ) +transpose(X,7) ) ,12) ,4) ) +transpose(arpeggio(echo(transpose((X|X) ,-7) ,4,6) ) ,7) ) ) ,-7) ,4) +transpose(((transpose(echo((((step(transpose(transpose(X,4) ,4) ,12) +((X+transpose(shuffle(X) ,7) ) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ) +transpose(echo(transpose(transpose(X,-7) ,-7) ,4,6) ,12) ) +transpose(echo(X,4,6) ,12) ) ,4,6) ,-7) +transpose(transpose((transpose(((shuffle(X) +transpose(step((X|X) ,12) ,12) ) +arpeggio(step(step(X,12) ,12) ) ) ,-5) +transpose(step(((arpeggio(((transpose((echo(X,4,6) |X) ,-5) +transpose((X+(X+transpose(X,12) ) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ) +transpose((X+transpose((((shuffle((X+transpose(X,12) ) ) |echo(X,4,6) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,4) ) +transpose(transpose(((((X+transpose(X,7) ) +transpose(X,7) ) +transpose(X,7) ) +transpose((arpeggio(X) +transpose((echo(X,4,6) +transpose(X,7) ) ,7) ) ,12) ) ,-5) ,7) ) ,12) ,7) ) ,4) ,4) ) +transpose(((echo(echo((((X|transpose(X,-7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) ,4,6) +transpose(step((((echo(X,4,6) +transpose((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) +transpose(((shuffle((X+X) ) +transpose((X|X) ,4) ) +transpose((((arpeggio(X) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,7) ) ,12) ,12) ) |step((arpeggio(transpose(shuffle(X) ,4) ) |((X+X) +transpose(transpose(step(X,12) ,4) ,7) ) ) ,12) ) ,7) ) ,4) ) +transpose(echo(transpose(((echo(X,4,6) +transpose((X+X) ,7) ) |transpose((shuffle(echo(X,4,6) ) +arpeggio(arpeggio(X) ) ) ,4) ) ,4) ,4,6) ,7) ) +transpose(shuffle((((shuffle((transpose(((((echo(X,4,6) +transpose((shuffle(transpose(X,-5) ) +X) ,7) ) +transpose(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(step(X,12) ,7) ) ,7) ) +transpose((((((X+X) +transpose(X,4) ) +transpose(step(step(X,12) ,12) ,-5) ) +transpose(step(shuffle(echo(shuffle(X) ,4,6) ) ,12) ,4) ) +transpose((arpeggio(arpeggio(X) ) +(X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose(step(arpeggio((X|arpeggio(X) ) ) ,12) ,7) ) ,4) +transpose(transpose(((step((X|X) ,12) |((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ) |arpeggio(((X+transpose(X,7) ) +transpose((X|X) ,7) ) ) ) ,4) ,12) ) ) +transpose(shuffle(step(step(shuffle(shuffle(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ) ) ,12) ,12) ) ,7) ) +transpose(transpose(arpeggio(((echo(((((X+X) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) +(((transpose(echo(X,4,6) ,-7) +transpose(((transpose((X+transpose(X,7) ) ,4) +transpose(step(X,12) ,7) ) +(X+transpose((X+transpose(X,7) ) ,7) ) ) ,4) ) +transpose((shuffle((X+step(X,12) ) ) |step(transpose(X,-5) ,12) ) ,7) ) +transpose(arpeggio(((step(echo((X|X) ,4,6) ,12) +transpose(arpeggio(shuffle(X) ) ,4) ) +transpose(((((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) ,7) ) ) ,7) ) ) |step(transpose((((X+step(echo(X,4,6) ,12) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ,4) ,4) ) +transpose((transpose(shuffle(echo(X,4,6) ) ,-7) +(transpose(X,4) +transpose((transpose(X,4) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ) ,7) ) ,-7) ,12) ) ) ,-5) ,4) ) +transpose((step(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,12) +shuffle(shuffle(transpose((((X|X) +transpose((X+X) ,7) ) +transpose((X|X) ,4) ) ,4) ) ) ) ,7) ) ) ,7) ) ) ,-7) ) ,7) )
random seed used was 217936055

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