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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Phrase for X:
# of Tracks:
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After 15 generations the expression "X" became this:
arpeggio((((transpose((step(((((echo(X,4,6) |X) +transpose((shuffle(X) |X) ,7) ) +transpose(((arpeggio(X) |X) |(transpose(X,-5) +transpose(X,-5) ) ) ,4) ) +transpose(transpose(arpeggio(((transpose(X,-5) |X) +transpose(transpose(X,-5) ,7) ) ) ,4) ,7) ) ,12) +transpose((((transpose(echo(transpose(echo(X,4,6) ,4) ,4,6) ,-5) +(((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) |arpeggio(shuffle(X) ) ) ) |(step((X|(transpose(X,-7) +transpose(X,4) ) ) ,12) +transpose(echo((transpose(transpose(X,-5) ,4) |X) ,4,6) ,12) ) ) +(transpose(arpeggio(((X|transpose(X,4) ) +transpose(arpeggio(X) ,12) ) ) ,-7) +transpose((((arpeggio(X) +transpose(((X+X) +transpose(X,12) ) ,7) ) |((transpose(X,-5) +transpose(X,4) ) +transpose((X|(X+transpose(X,7) ) ) ,7) ) ) |transpose(((transpose(arpeggio(X) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ) ,12) ) ) ,12) ) ,4) +transpose(transpose(((transpose(((((X+X) +transpose(transpose(X,-7) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) +(((shuffle(X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(step(X,12) ,12) ) ) ,-5) +transpose(echo((echo((X+transpose(X,12) ) ,4,6) +transpose(((X|X) +transpose(X,12) ) ,7) ) ,4,6) ,4) ) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose((transpose(X,-7) +transpose((X|X) ,7) ) ,12) ) ,7) ) ,-7) ,4) ) +transpose(shuffle(arpeggio(transpose(((arpeggio((transpose(X,4) +transpose((echo(X,4,6) +echo(X,4,6) ) ,7) ) ) +transpose((((transpose(step(transpose(X,4) ,12) ,-7) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose(((arpeggio(transpose(transpose(X,-5) ,-5) ) |(X+transpose(X,7) ) ) +transpose((transpose(transpose(X,-5) ,4) +transpose((X+(X|X) ) ,7) ) ,4) ) ,7) ) ,-7) ) ) ,7) ) +transpose((transpose(((transpose(echo((shuffle(X) +transpose(((transpose(arpeggio(X) ,-7) +transpose(transpose((X+X) ,-5) ,12) ) +transpose(step(X,12) ,4) ) ,12) ) ,4,6) ,-5) +transpose(transpose(transpose((X+transpose(X,-5) ) ,4) ,-7) ,4) ) +transpose(transpose(((arpeggio(transpose(transpose(transpose(X,4) ,-5) ,-5) ) |transpose(step((arpeggio(X) +transpose(X,7) ) ,12) ,4) ) |transpose((arpeggio(X) +transpose((transpose((X+transpose(X,12) ) ,4) +transpose(arpeggio(X) ,12) ) ,12) ) ,-7) ) ,4) ,7) ) ,-7) |shuffle(transpose((((transpose(transpose(((transpose((X|X) ,-5) +transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) |transpose(step(echo(X,4,6) ,12) ,-5) ) +transpose((step(step(step((X+transpose(X,7) ) ,12) ,12) ,12) |(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X|(X+transpose(X,12) ) ) ,7) ) ) |((X+transpose(X,7) ) +transpose((((X|X) |transpose(X,4) ) +(X+X) ) ,12) ) ) ) ,4) ) +transpose(((X|X) +(shuffle(echo(X,4,6) ) |((((transpose(X,4) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +(X+transpose(transpose(X,-5) ,12) ) ) +transpose(step((X|X) ,12) ,12) ) ) ) ,7) ) ,4) ) ) ,12) ) )
random seed used was 62 EXPR = ((transpose(step((echo((transpose(((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-5) +transpose(arpeggio(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,-7) ) ,7) ) ,4,6) +shuffle((arpeggio(step((echo(X,4,6) +(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ,12) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ) ) ,12) ,-7) +step((transpose(transpose(X,4) ,-5) +transpose(echo(((X+transpose(X,12) ) +transpose(X,-5) ) ,4,6) ,-5) ) ,12) ) +transpose(transpose(transpose(transpose(transpose(arpeggio(shuffle(step(X,12) ) ) ,4) ,-5) ,-7) ,-5) ,-7) )
random seed used was 0 EXPR = ((transpose((step(transpose(arpeggio(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,7) ) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |echo(X,4,6) ) ,7) ) ,4) ) ,-5) ,12) |(shuffle(transpose(X,4) ) |(((((transpose(X,-7) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) |X) +transpose((arpeggio(step(X,12) ) +transpose(transpose((X+X) ,-5) ,12) ) ,4) ) +transpose(((((X+arpeggio(X) ) +transpose((X+X) ,7) ) |transpose((X+transpose(X,12) ) ,-7) ) +((arpeggio(X) +transpose(transpose(X,4) ,12) ) +X) ) ,7) ) ) ) ,4) |(shuffle(transpose(transpose(transpose(((X|X) +X) ,4) ,-7) ,-7) ) +transpose(transpose((((transpose((((shuffle(step(transpose(X,-7) ,12) ) +(((X+transpose(shuffle(X) ,7) ) +transpose(((X+X) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose(((transpose(X,-5) |X) +transpose(((X|X) +transpose(X,7) ) ,12) ) ,7) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((shuffle(X) +transpose(X,12) ) ,12) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,-7) +transpose(((((transpose(X,-7) +transpose(X,12) ) +(transpose(X,-5) |(X+X) ) ) +transpose(((X+transpose(step(X,12) ,7) ) |arpeggio(arpeggio(X) ) ) ,7) ) |((((transpose(step(X,12) ,4) +transpose(transpose(echo(transpose(X,-7) ,4,6) ,-5) ,4) ) +transpose(((X+transpose((X+transpose(X,12) ) ,12) ) +step(arpeggio(X) ,12) ) ,7) ) |(transpose(X,-5) |X) ) +transpose(transpose(transpose(transpose(X,-7) ,4) ,4) ,-5) ) ) ,4) ) +transpose((shuffle(echo(transpose(((transpose(transpose(X,-5) ,-5) |echo((X|X) ,4,6) ) |X) ,-7) ,4,6) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,4) ,7) ) ,4) ) +transpose(((transpose(arpeggio(transpose(echo(X,4,6) ,4) ) ,-7) +transpose(((((X+X) +transpose(X,7) ) |transpose((((((X+X) +transpose(X,4) ) +transpose((X+X) ,7) ) +transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) ,-5) ) +(echo((shuffle(X) +transpose(arpeggio(X) ,7) ) ,4,6) +transpose(transpose(transpose(X,-7) ,-5) ,-5) ) ) ,7) ) +transpose(((((((X+X) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose((X+X) ,4) ,7) ) |echo(transpose(transpose(((echo(X,4,6) +transpose((X|X) ,4) ) +transpose(arpeggio(X) ,7) ) ,-7) ,4) ,4,6) ) |shuffle(((transpose(X,4) +((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) ) +transpose((X|(X+X) ) ,7) ) ) ) ,12) ) ,7) ) ,-5) ,12) ) ) +echo((echo(transpose(transpose(step(((transpose(echo(X,4,6) ,-7) +shuffle(X) ) +transpose((X+((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,12) ,-7) ,-7) ,4,6) +transpose(transpose(echo((transpose(echo(transpose(X,-5) ,4,6) ,4) +transpose(((transpose(X,-7) +(X|X) ) +transpose(X,12) ) ,7) ) ,4,6) ,-7) ,7) ) ,4,6) )
random seed used was 0 EXPR = (transpose(((transpose(((step((transpose(X,4) +transpose(step(X,12) ,-7) ) ,12) +transpose(transpose(((X+X) |(step(X,12) +transpose(transpose(X,-5) ,7) ) ) ,-5) ,12) ) |transpose(transpose(((X+transpose(X,12) ) +transpose(((X+transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,4) ,-5) ) ,4) +transpose(transpose(transpose(transpose(((transpose(X,-5) +transpose(arpeggio((X|X) ) ,4) ) +transpose(X,7) ) ,4) ,4) ,4) ,4) ) +transpose(transpose(transpose((((transpose((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) ,4) +transpose((((transpose(X,-7) |X) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) +transpose(((X+X) +transpose(step(X,12) ,7) ) ,7) ) |transpose(arpeggio(((echo(X,4,6) +transpose(((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose((step(X,12) |(X+transpose(X,12) ) ) ,7) ) ) ,4) ) ,4) ,-5) ,7) ) ,-7) +transpose(transpose(((transpose(((X+X) +transpose(X,12) ) ,-7) +transpose((transpose(transpose(X,-5) ,4) +transpose(transpose(((transpose((X+transpose(X,7) ) ,4) +transpose(step(X,12) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,-5) ,4) ) ,12) ) +(transpose(step(transpose((arpeggio(echo(((X+transpose(X,7) ) +transpose(((X|X) +X) ,7) ) ,4,6) ) +(transpose(step(transpose(X,4) ,12) ,-5) |(X+shuffle(X) ) ) ) ,-5) ,12) ,-7) +transpose((((((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) |X) +transpose(((X+transpose(X,12) ) +transpose((transpose(X,4) +(X+transpose(X,7) ) ) ,7) ) ,12) ) +transpose(transpose(transpose(transpose((transpose(X,-7) +transpose((X|X) ,7) ) ,4) ,-7) ,-5) ,7) ) ,7) ) ) ,-5) ,12) )
random seed used was 0

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