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 17 generations the expression "X" became this:
(((shuffle(transpose(echo(transpose(step((transpose(shuffle(echo((X+X) ,4,6) ) ,4) +transpose(echo(X,4,6) ,7) ) ,12) ,-5) ,4,6) ,-7) ) +transpose(transpose(echo(arpeggio(echo(((shuffle((X+transpose(X,7) ) ) |echo((X+transpose(X,7) ) ,4,6) ) |(((step(X,12) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) |(step(X,12) +transpose(echo(X,4,6) ,12) ) ) ) ,4,6) ) ,4,6) ,-5) ,7) ) +transpose(((step((((echo(shuffle((transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) +arpeggio(transpose(arpeggio(X) ,4) ) ) ) ,4,6) +((transpose(((((echo(X,4,6) |(X+transpose(X,7) ) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) +transpose(step(X,12) ,4) ) +transpose(arpeggio(X) ,7) ) ,-7) +transpose(shuffle(((((step((X+transpose(X,12) ) ,12) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose((arpeggio(echo(echo(X,4,6) ,4,6) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose((echo(transpose(X,-5) ,4,6) |transpose(step(X,12) ,4) ) ,7) ) +transpose(step(((step(transpose(X,4) ,12) +transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ) ,4) ) +transpose(arpeggio(((((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(shuffle((X|X) ) ,7) ) +transpose(echo((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) +((X+transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,4,6) ,12) ) ) ,7) ) ) +transpose(step(((((echo(arpeggio((X+transpose(X,7) ) ) ,4,6) +transpose((step(step(X,12) ,12) +transpose(((X+transpose(X,12) ) +arpeggio(X) ) ,-7) ) ,4) ) +transpose(step(arpeggio(X) ,12) ,7) ) +transpose(arpeggio(transpose(echo(X,4,6) ,-7) ) ,4) ) +transpose((((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) +((transpose(((X+X) +transpose((X+X) ,7) ) ,4) +transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose((echo(echo(X,4,6) ,4,6) +transpose((X|X) ,7) ) ,7) ) ) ,7) ) ,12) ,4) ) +transpose((transpose((shuffle(transpose(X,-5) ) +transpose((transpose(echo(step(transpose(X,4) ,12) ,4,6) ,4) +transpose(transpose(transpose(shuffle(X) ,-5) ,4) ,12) ) ,12) ) ,-5) +transpose((((((transpose(echo(echo(echo(X,4,6) ,4,6) ,4,6) ,4) +transpose(((((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |(X+transpose(X,12) ) ) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose((echo(X,4,6) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ) ,7) ) |((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(arpeggio(echo(X,4,6) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(transpose(shuffle(arpeggio(((shuffle(X) +X) +transpose(X,7) ) ) ) ,-7) ,4) ) +transpose((transpose(echo(X,4,6) ,-5) +transpose((X|X) ,12) ) ,7) ) ,12) ) ,7) ) ,12) +transpose((transpose(((arpeggio((((arpeggio(((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose(arpeggio((shuffle(X) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ) +transpose((arpeggio(step((X|X) ,12) ) +transpose((transpose(((X|X) |((X+transpose(X,12) ) |arpeggio(X) ) ) ,-5) +transpose((X+X) ,7) ) ,7) ) ,12) ) +transpose(arpeggio((step(X,12) +transpose(X,4) ) ) ,4) ) +transpose((shuffle(transpose((X+X) ,4) ) +transpose((transpose((X+transpose(transpose(X,4) ,7) ) ,-7) +transpose(transpose((shuffle(X) +transpose(X,4) ) ,-5) ,12) ) ,7) ) ,7) ) ) +transpose(((((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,4) +transpose((((arpeggio(arpeggio(X) ) +((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose((transpose(X,4) +transpose(X,12) ) ,4) ) +transpose((arpeggio(X) +echo((X+X) ,4,6) ) ,7) ) ,12) ) |(step(step(X,12) ,12) +transpose((transpose(X,-5) +transpose((arpeggio(X) +transpose(X,7) ) ,12) ) ,7) ) ) +transpose(shuffle(arpeggio((((step((X+transpose(X,7) ) ,12) |(transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) ) +transpose(step(arpeggio((X|X) ) ,12) ,7) ) ) ) ,7) ) +transpose((((step(shuffle(((X+transpose(step(X,12) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,12) +transpose(((echo(X,4,6) +transpose((X+X) ,12) ) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +((shuffle(X) +transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) ,12) ) +transpose(shuffle(arpeggio(step(transpose(arpeggio(X) ,4) ,12) ) ) ,4) ) +transpose((transpose((X+transpose(arpeggio(X) ,7) ) ,-7) +transpose(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(((X+transpose(X,7) ) |echo(X,4,6) ) ,7) ) ,4,6) ,7) ) ,7) ) ,7) ) ,4) ) +transpose((transpose(transpose((X+transpose(X,12) ) ,-7) ,4) +((transpose((X|echo(X,4,6) ) ,-7) +transpose(((X+transpose(X,7) ) +X) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) ,7) ) ,4) |(transpose(step(((((step(arpeggio(shuffle(X) ) ,12) +step(((step(X,12) +transpose((X+X) ,7) ) |X) ,12) ) +transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((((X|X) +transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) +transpose(echo(X,4,6) ,-5) ) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,7) ) +transpose(((transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) ) ,-5) +transpose(((transpose(step(X,12) ,-7) +transpose((transpose(X,4) |X) ,12) ) +(((transpose(X,4) |X) +transpose((X|X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) +transpose((transpose(((shuffle((X|X) ) +transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) +(echo(shuffle(X) ,4,6) +transpose(echo((step(X,12) +transpose(shuffle(X) ,4) ) ,4,6) ,7) ) ) ,12) ) ,4) ) +transpose(step((((transpose(step(X,12) ,-7) +transpose((shuffle(echo(X,4,6) ) +X) ,7) ) +transpose((transpose((X|transpose(X,-5) ) ,-5) |(X+transpose(X,7) ) ) ,4) ) +transpose(X,7) ) ,12) ,7) ) ,12) ,4) +transpose(echo(echo(arpeggio(shuffle(arpeggio(transpose(X,4) ) ) ) ,4,6) ,4,6) ,7) ) ) ,4) ) +transpose(echo((echo((step(step(shuffle(((((step(transpose(X,-5) ,12) +transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) +transpose(shuffle(shuffle((echo(X,4,6) +transpose(X,7) ) ) ) ,7) ) +transpose((((X+transpose(step(X,12) ,7) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) +transpose(echo(X,4,6) ,7) ) ,12) ) ) ,12) ,12) |((shuffle(transpose(((X|X) +step(X,12) ) ,-5) ) +transpose(((transpose(X,4) +transpose(transpose((X+X) ,4) ,7) ) +transpose(((X+transpose(X,12) ) +transpose((echo(X,4,6) +transpose(X,-5) ) ,7) ) ,7) ) ,4) ) +transpose(arpeggio(transpose(echo(X,4,6) ,-7) ) ,7) ) ) ,4,6) +transpose(transpose(step(((arpeggio((X+transpose((X+transpose(X,12) ) ,12) ) ) |transpose(transpose(X,-7) ,-7) ) |(arpeggio(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,4) ) |transpose(transpose(transpose(X,-7) ,4) ,4) ) ) ,12) ,4) ,-7) ) ,4,6) ,7) ) ,7) ) +transpose(arpeggio((((transpose((transpose((X+transpose(X,7) ) ,-5) +transpose(echo(transpose(arpeggio(X) ,4) ,4,6) ,7) ) ,-7) +transpose(((arpeggio(arpeggio(step(X,12) ) ) +((shuffle(((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ) +transpose(((transpose(arpeggio(X) ,-7) +transpose((((X+X) +transpose((X+X) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(step(echo(transpose(arpeggio(X) ,4) ,4,6) ,12) ,7) ) ) +arpeggio(shuffle((transpose((X|X) ,-5) +transpose(arpeggio(X) ,12) ) ) ) ) ,4) ) +transpose((((shuffle(echo(((transpose(shuffle(X) ,4) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ) +transpose(((transpose(transpose(transpose(X,-5) ,4) ,-7) +transpose((step(shuffle((X+X) ) ,12) +transpose(((step(transpose(X,4) ,12) +transpose((X+transpose((X|X) ,12) ) ,4) ) +transpose(((X+X) +transpose(shuffle(X) ,12) ) ,7) ) ,7) ) ,4) ) +transpose(echo(arpeggio(arpeggio(X) ) ,4,6) ,7) ) ,4) ) +transpose((((arpeggio((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(X,12) ) ) +transpose((step(shuffle(X) ,12) +(echo((X+X) ,4,6) |arpeggio(echo(X,4,6) ) ) ) ,12) ) +transpose(transpose(echo((X+X) ,4,6) ,-7) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,7) ) +shuffle((echo(X,4,6) +(X|X) ) ) ) ,7) ) +transpose((echo(transpose(((echo(transpose((arpeggio(shuffle((X|X) ) ) +transpose(shuffle(X) ,7) ) ,4) ,4,6) +transpose(shuffle(((echo(transpose(X,-7) ,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,7) ) +transpose(step((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |(X+X) ) ,12) ,7) ) ) ,4) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,4) ,4,6) +transpose(transpose(transpose(step(transpose(arpeggio(shuffle((X+transpose(X,7) ) ) ) ,-7) ,12) ,4) ,-7) ,12) ) ,12) ) ) ,12) )
random seed used was 38921584

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