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:
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After 16 generations the expression "X" became this:
(((shuffle((((((transpose(X,-7) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(((X|X) +transpose((transpose(X,-7) +transpose(step(X,12) ,12) ) ,12) ) ,7) ) +transpose((transpose((transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4) +transpose(shuffle((transpose(X,4) |X) ) ,7) ) ,-7) +transpose(transpose(transpose(transpose(arpeggio(X) ,-7) ,4) ,-5) ,7) ) ,12) ) +transpose((((transpose(X,-5) |transpose(transpose(X,-7) ,-7) ) +transpose(transpose((X|step(transpose((X|X) ,-7) ,12) ) ,-5) ,12) ) |echo(step((shuffle(X) +transpose(transpose(X,-7) ,12) ) ,12) ,4,6) ) ,12) ) |((transpose((((echo(transpose(transpose(X,-5) ,4) ,4,6) +transpose(transpose((((X+X) |(((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,4) ) ) +transpose(echo((X|X) ,4,6) ,12) ) ,-5) ,4) ) +transpose((step(transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) ,12) +transpose(((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(transpose((X|(X+transpose(X,7) ) ) ,4) ,7) ) ,7) ) ,7) ) +transpose(step(transpose(echo(transpose(X,4) ,4,6) ,4) ,12) ,7) ) ,-5) +transpose(transpose((shuffle(shuffle(transpose(echo(X,4,6) ,4) ) ) |(((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,7) ) +transpose(arpeggio(X) ,7) ) ) ,-7) ,4) ) +transpose((transpose((shuffle(X) +transpose((X+transpose(X,7) ) ,7) ) ,4) |transpose(transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,4) ) ,7) ) ) ) +transpose(step(transpose(transpose((transpose(((X+X) |arpeggio(X) ) ,-5) +((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) ,-7) +transpose((transpose((X|X) ,-5) +transpose(((X+transpose((X|X) ,7) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(echo((transpose(X,-5) |transpose(X,-7) ) ,4,6) ,7) ) ) ,4) ,-7) ,12) ,7) ) +transpose(arpeggio((echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) |transpose(shuffle(X) ,4) ) ) ,4) ) |step(transpose(step(transpose(step(arpeggio(transpose(transpose((shuffle(((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) |(shuffle(shuffle(X) ) +transpose(step((X|X) ,12) ,12) ) ) ,4) ,-7) ) ,12) ,4) ,12) ,-7) ,12) )
random seed used was 17 EXPR = shuffle((echo((((transpose(transpose((echo(X,4,6) |shuffle(X) ) ,-5) ,-7) |echo(X,4,6) ) +transpose(echo((((((transpose(X,-5) +X) +transpose((transpose(X,-5) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ,12) ) |(arpeggio((X|X) ) +transpose(transpose((X|X) ,-5) ,7) ) ) ,4,6) +transpose((echo(step(((((shuffle(X) +transpose(X,-5) ) +transpose(transpose(transpose((X|X) ,-5) ,4) ,4) ) +transpose(((X|X) +(X+transpose(X,12) ) ) ,7) ) |transpose(((transpose(X,-7) +transpose(step(X,12) ,12) ) |echo(((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,4,6) ) ,-5) ) ,12) ,4,6) +transpose(((((X+X) +transpose(arpeggio(arpeggio(X) ) ,12) ) +((transpose(arpeggio(X) ,4) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(step(X,12) ,-7) ,12) ) ) |arpeggio((echo((X+transpose(X,7) ) ,4,6) |(arpeggio(transpose(X,-5) ) |step(transpose(X,4) ,12) ) ) ) ) ,12) ) ,7) ) )
random seed used was 0 EXPR = ((transpose(step(shuffle(transpose(step(X,12) ,-7) ) ,12) ,-5) +transpose(((echo(step(((transpose(X,-5) +transpose((((X|arpeggio(X) ) +transpose(transpose(X,4) ,7) ) |(X+X) ) ,12) ) |(step(transpose(transpose(X,4) ,-5) ,12) +transpose((arpeggio(echo(transpose(X,-5) ,4,6) ) +transpose(transpose(arpeggio(shuffle(X) ) ,-7) ,12) ) ,12) ) ) ,12) ,4,6) +transpose(echo(step(transpose((shuffle(((X+X) +transpose(X,7) ) ) |((X|X) |((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ) ) ,-5) ,12) ,4,6) ,7) ) |(((arpeggio(transpose(transpose(echo(transpose(X,4) ,4,6) ,-5) ,4) ) +transpose(transpose(echo((((X|X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,4) ,12) ) +transpose((transpose((((echo(X,4,6) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(X,4) ,12) ) ,-5) |step(transpose((transpose(X,-5) +transpose(step(X,12) ,12) ) ,4) ,12) ) ,4) ) +transpose(arpeggio(((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(X,7) ) ) ,7) ) ) ,-5) ) +transpose(step((((transpose(((X|X) |(shuffle(X) +transpose(X,7) ) ) ,4) |(transpose((transpose(step(X,12) ,-5) +transpose(transpose(((step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,12) +transpose(step(X,12) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,-7) ,7) ) ,4) +transpose((((((((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) |shuffle(transpose(X,-7) ) ) |(X+transpose(X,7) ) ) +transpose(arpeggio(((X|X) +transpose(X,12) ) ) ,12) ) +transpose(echo((echo((X|X) ,4,6) +transpose(arpeggio((X+transpose(X,7) ) ) ,12) ) ,4,6) ,12) ) |arpeggio((((transpose(X,-7) |(transpose(X,-7) +transpose(X,4) ) ) +transpose(step(X,12) ,4) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ) ) ,12) ) ) +transpose(shuffle(transpose(((transpose((((X|X) +transpose(transpose(X,4) ,7) ) +transpose(transpose((X|X) ,-5) ,7) ) ,-7) +((echo(arpeggio((X|X) ) ,4,6) |transpose(transpose(X,-5) ,-5) ) +transpose(transpose(X,4) ,7) ) ) |(((((X|X) |transpose((X|X) ,4) ) +transpose((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) ,4) ) +transpose((transpose((X|X) ,4) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,7) ) |((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(X,4) ,7) ) |transpose(X,-5) ) ) ) ,4) ) ,7) ) +transpose(shuffle(echo((shuffle(((echo(transpose(X,4) ,4,6) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ) |arpeggio(transpose(step((X+transpose(transpose(X,-5) ,7) ) ,12) ,4) ) ) ,4,6) ) ,12) ) ,12) ,12) )
random seed used was 0 EXPR = (((transpose(step(echo(transpose(arpeggio((echo(X,4,6) |transpose(X,4) ) ) ,-5) ,4,6) ,12) ,4) +transpose(((shuffle(transpose(shuffle(transpose(((X+X) |step(X,12) ) ,-5) ) ,-5) ) |transpose(arpeggio(arpeggio(((transpose(X,-7) |(X|X) ) |transpose(transpose(X,4) ,4) ) ) ) ,-7) ) +(transpose(transpose(step((transpose(X,-5) +transpose(X,7) ) ,12) ,-5) ,-5) +step(((step(transpose(transpose(transpose(X,-5) ,4) ,4) ,12) +transpose((((echo(transpose(transpose(X,4) ,4) ,4,6) +transpose(transpose(X,4) ,4) ) +transpose((step(X,12) +transpose(X,12) ) ,7) ) +transpose(transpose((X|X) ,4) ,12) ) ,4) ) +transpose((transpose(arpeggio(X) ,4) +((transpose(X,-5) +transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose((echo(X,4,6) |transpose(X,-5) ) ,7) ) ) ,7) ) ,12) ) ) ,4) ) +transpose(echo(transpose(transpose((((transpose((X+transpose(X,12) ) ,-7) +transpose(step(transpose(X,-5) ,12) ,12) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) |transpose(transpose(arpeggio(transpose((((X|X) +transpose(X,4) ) +transpose(((X|X) +transpose(X,12) ) ,7) ) ,-5) ) ,-5) ,4) ) ,4) ,4) ,4,6) ,7) ) +transpose(((transpose((shuffle(((((X+transpose(echo(X,4,6) ,12) ) +((transpose(X,4) +shuffle(X) ) +(transpose(X,-7) +transpose(X,12) ) ) ) |arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) |(arpeggio(transpose(transpose(X,4) ,-7) ) +transpose(arpeggio(arpeggio((X+transpose(X,12) ) ) ) ,12) ) ) ) +transpose((transpose(echo(((transpose(X,-7) |transpose(transpose(X,-5) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,4,6) ,-5) |step(transpose(echo(transpose(transpose(X,-5) ,-7) ,4,6) ,-7) ,12) ) ,12) ) ,4) +transpose(step(transpose(arpeggio(step((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,-7) ,12) ,4) ) +transpose(((transpose(step(((transpose(step((X|X) ,12) ,-7) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose((X+(X+transpose(echo(X,4,6) ,7) ) ) ,7) ) ,12) ,-5) +transpose(((transpose(((((echo(X,4,6) +transpose(echo(step(X,12) ,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +(shuffle(X) |((X+X) |(X+transpose(X,12) ) ) ) ) +transpose(arpeggio(((echo((X+transpose(X,12) ) ,4,6) +transpose(X,4) ) +transpose(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ,7) ) ,-7) +transpose(step(shuffle((((((X+transpose((X|X) ,4) ) +transpose(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) |step(((X+transpose(X,12) ) +transpose((X|X) ,12) ) ,12) ) |(X|X) ) |arpeggio(transpose(((arpeggio(X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) ) ) ) ,12) ,4) ) +transpose(step((((step(step(echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ,12) ,12) |(transpose(arpeggio(shuffle(X) ) ,-5) +transpose(arpeggio(arpeggio(X) ) ,-5) ) ) |(((arpeggio((X+X) ) +transpose(transpose(arpeggio(transpose(transpose(X,-5) ,-7) ) ,4) ,12) ) +transpose((step(transpose(X,-7) ,12) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ,12) ) ,4) ) +transpose(shuffle(((echo(X,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo((X|X) ,4,6) ,7) ) ) ,7) ) ) +transpose((shuffle(((transpose(X,4) +transpose((shuffle(X) |X) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ) +transpose(((step(transpose(transpose(X,-5) ,4) ,12) +transpose(transpose(echo(((X|X) +arpeggio(X) ) ,4,6) ,4) ,4) ) +transpose(step(((X|X) +transpose(transpose(X,-7) ,7) ) ,12) ,7) ) ,12) ) ,7) ) ,12) ,7) ) ,12) ) +transpose(shuffle(arpeggio(transpose((((step(X,12) +transpose(echo(X,4,6) ,12) ) +transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ) ) ,12) ) ,7) ) ,4) )
random seed used was 0

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