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 20 generations the expression "X" became this:
(transpose((shuffle(((transpose(((X+transpose(X,7) ) +transpose(transpose(transpose((X|X) ,-7) ,-7) ,7) ) ,-7) +transpose((transpose(step(arpeggio(((shuffle(transpose(X,4) ) +transpose((transpose(X,4) |transpose(X,4) ) ,7) ) +shuffle(X) ) ) ,12) ,4) |echo(arpeggio(step(echo(transpose(X,-5) ,4,6) ,12) ) ,4,6) ) ,4) ) +transpose(echo(transpose(echo((((shuffle(arpeggio(echo(X,4,6) ) ) +transpose(shuffle(echo(X,4,6) ) ,4) ) +transpose(arpeggio(transpose(transpose(X,-7) ,4) ) ,7) ) +transpose(shuffle((shuffle(transpose(X,-7) ) |(X+X) ) ) ,12) ) ,4,6) ,-7) ,4,6) ,7) ) ) +arpeggio(step(transpose((X+arpeggio(transpose(arpeggio(shuffle(X) ) ,-7) ) ) ,4) ,12) ) ) ,-5) +echo(transpose((step((echo(arpeggio(arpeggio(step(X,12) ) ) ,4,6) +(transpose((((echo((shuffle(X) +X) ,4,6) +transpose(shuffle(transpose((X+transpose((X+X) ,12) ) ,-7) ) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) +transpose((((echo(shuffle(X) ,4,6) +transpose(transpose((arpeggio(X) +transpose(X,7) ) ,-7) ,4) ) +transpose((arpeggio(X) |X) ,7) ) |(transpose((echo(X,4,6) +transpose(X,7) ) ,4) +arpeggio(X) ) ) ,12) ) ,-5) |shuffle(transpose(shuffle((X+transpose(X,-5) ) ) ,4) ) ) ) ,12) +transpose(arpeggio((((((shuffle((X|X) ) |((arpeggio(X) |(X|X) ) +transpose(transpose(arpeggio(X) ,-5) ,12) ) ) +transpose(step((((((transpose((transpose((X|X) ,-5) +transpose(arpeggio(arpeggio(X) ) ,7) ) ,-7) +transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,4) ) +transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +X) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +X) +transpose(transpose(X,4) ,12) ) ,-7) ,4) ) +transpose(transpose(((echo(step(X,12) ,4,6) +transpose(step(((X|X) |X) ,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) ,7) ) ,12) ,4) ) +transpose((shuffle(((echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) +transpose(arpeggio(step(X,12) ) ,12) ) |echo(transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ,4,6) ) ) |shuffle(arpeggio((((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +((X+transpose(X,12) ) +transpose(arpeggio(X) ,4) ) ) ) ) ) ,7) ) +shuffle((step(X,12) |step((transpose((echo(X,4,6) +X) ,-5) +(((step(transpose(X,-7) ,12) |(X+X) ) +transpose((((X|transpose(X,-7) ) +transpose(arpeggio(X) ,7) ) +(X+(X+X) ) ) ,4) ) +transpose(((((X+X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ) ,12) ) ) ) +transpose((((shuffle(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ,-7) ) |transpose(((arpeggio(X) +(X+transpose(X,12) ) ) +((X+transpose(X,7) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ) ,-7) ) |arpeggio(arpeggio(transpose(shuffle((step(step(X,12) ,12) +transpose((X|X) ,12) ) ) ,4) ) ) ) +transpose(transpose((step((shuffle(X) |(((X+transpose(X,12) ) +transpose(shuffle(X) ,12) ) +transpose(echo(X,4,6) ,-7) ) ) ,12) +transpose((arpeggio(shuffle(X) ) |((arpeggio(X) +transpose(transpose(step(X,12) ,-5) ,12) ) +transpose((((X+X) +shuffle(X) ) +transpose(X,4) ) ,12) ) ) ,7) ) ,-5) ,7) ) ,7) ) ) ,7) ) ,-5) ,4,6) )
random seed used was 3442951 EXPR = shuffle(step(shuffle(((arpeggio(shuffle(shuffle(((shuffle(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) |(shuffle((step(X,12) +transpose(X,-5) ) ) |transpose(transpose(X,-7) ,-5) ) ) |(step(transpose((shuffle(X) +X) ,4) ,12) |transpose(transpose(X,-7) ,-7) ) ) ) ) ) +transpose(echo(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(echo((transpose(transpose((X+arpeggio(X) ) ,4) ,-5) +transpose(shuffle(arpeggio((X+transpose(X,12) ) ) ) ,7) ) ,4,6) ,7) ) ,-5) ,4,6) ,12) ) +transpose(shuffle(shuffle(transpose((((step((transpose(X,4) +(X|X) ) ,12) |step(transpose(shuffle(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ) ,-7) ,12) ) +transpose(transpose(((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) +transpose((transpose(X,-7) +step(X,12) ) ,7) ) ,4) ,7) ) +(step(transpose((X|X) ,4) ,12) +arpeggio(arpeggio(transpose(arpeggio(transpose(X,-5) ) ,-5) ) ) ) ) ,-5) ) ) ,12) ) ) ,12) )
random seed used was 0 EXPR = (echo(shuffle(transpose(arpeggio(step((shuffle(transpose(step(X,12) ,-5) ) +transpose(echo(((transpose(X,4) +echo(X,4,6) ) +(X+transpose(X,7) ) ) ,4,6) ,12) ) ,12) ) ,4) ) ,4,6) +transpose(shuffle((shuffle(transpose(shuffle(step((((((shuffle(X) |X) +transpose(((transpose((X+transpose((X+X) ,7) ) ,-7) +transpose(((((transpose(shuffle(X) ,-7) +transpose(shuffle(arpeggio(X) ) ,7) ) +step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose(transpose(arpeggio(arpeggio(arpeggio(X) ) ) ,-5) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-7) ,7) ) ,4) ) +transpose((((shuffle(shuffle(X) ) +transpose((transpose(transpose(X,4) ,-7) +transpose(shuffle(transpose(X,-7) ) ,7) ) ,7) ) +transpose(X,7) ) |((step(shuffle(X) ,12) +transpose(X,-5) ) +transpose((echo(X,4,6) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) ,7) ) ,4) ) +transpose((step((echo(((X+transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ,4,6) +transpose((echo(((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) ,4,6) |step(step(transpose(X,4) ,12) ,12) ) ,-5) ) ,12) +transpose((step(transpose(transpose(shuffle(transpose(X,-5) ) ,-5) ,-5) ,12) +transpose(((transpose(transpose(X,-5) ,-5) +transpose(shuffle(transpose(X,-7) ) ,7) ) |step(shuffle((X+X) ) ,12) ) ,7) ) ,-5) ) ,7) ) +transpose(step(transpose(step((arpeggio(transpose(X,4) ) +transpose(transpose((X|X) ,-7) ,12) ) ,12) ,4) ,12) ,4) ) +transpose(echo(transpose(transpose(X,-7) ,4) ,4,6) ,7) ) ,12) ) ,4) ) |(((transpose(transpose(((transpose(X,4) +transpose(arpeggio((arpeggio((X+transpose(shuffle(X) ,7) ) ) +transpose(transpose(((X+transpose(X,7) ) |transpose(X,-7) ) ,-5) ,7) ) ) ,12) ) +(transpose(transpose((((X+X) +transpose(arpeggio(X) ,7) ) |transpose(transpose((X|X) ,-7) ,4) ) ,4) ,-7) |shuffle(transpose(arpeggio(echo((transpose((X+transpose(X,12) ) ,-5) |step(X,12) ) ,4,6) ) ,-5) ) ) ) ,-7) ,-5) |(((((shuffle(shuffle(X) ) +transpose((((X|X) +transpose(X,-7) ) +transpose(((X+X) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,-7) ) +transpose(((arpeggio(shuffle(((X|X) +transpose(step(X,12) ,4) ) ) ) +transpose(transpose(transpose((X|X) ,-7) ,4) ,4) ) +transpose((step(X,12) +X) ,7) ) ,12) ) |(shuffle(transpose((shuffle(transpose(X,4) ) +transpose((X|shuffle(X) ) ,7) ) ,4) ) +transpose(arpeggio(transpose(arpeggio(X) ,-7) ) ,7) ) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) |transpose((((((X|(X+X) ) +transpose(X,4) ) |transpose(transpose(X,4) ,-5) ) +transpose(arpeggio(shuffle(X) ) ,-5) ) +transpose(echo(transpose(transpose((arpeggio(X) |arpeggio(transpose(transpose(X,4) ,-5) ) ) ,-7) ,4) ,4,6) ,7) ) ,-5) ) ) +transpose(arpeggio((shuffle(transpose(transpose((arpeggio((step((shuffle(X) |shuffle(X) ) ,12) +transpose(X,12) ) ) +transpose((transpose(transpose(X,-5) ,-7) +(X+transpose((transpose(X,-7) +step(((step(X,12) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,12) ) ,7) ) ) ,12) ) ,4) ,-7) ) +transpose((arpeggio((step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,12) |(arpeggio(((echo(transpose(X,4) ,4,6) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ) |X) ) +transpose((transpose(shuffle(X) ,4) +transpose(arpeggio((X+X) ) ,-7) ) ,12) ) ) ) |((step(((X+X) +transpose(X,7) ) ,12) +transpose((((shuffle(X) +transpose(arpeggio(echo(X,4,6) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,12) ) |((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) ) ,12) ) ,7) ) |arpeggio((echo(transpose(X,-7) ,4,6) +transpose(transpose(shuffle(X) ,4) ,4) ) ) ) ) ,12) ) ) ,12) ) |transpose((transpose(arpeggio((step(shuffle((transpose(shuffle((transpose(shuffle(X) ,4) +transpose(transpose(X,-7) ,7) ) ) ,-5) +transpose(echo(arpeggio((transpose(transpose(X,4) ,-7) +X) ) ,4,6) ,7) ) ) ,12) +transpose(transpose(transpose(transpose(shuffle(((transpose(X,-5) +transpose((arpeggio(arpeggio(X) ) +transpose(arpeggio((((X+transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) ) ,12) ) ,7) ) +shuffle(transpose(arpeggio(X) ,-7) ) ) ) ,4) ,-7) ,-5) ,7) ) ) ,4) |((step((((((((shuffle(shuffle(X) ) |(step((X|X) ,12) |shuffle((X+transpose(X,7) ) ) ) ) +transpose(transpose(transpose(((X+transpose(X,12) ) +transpose(X,-7) ) ,-7) ,-5) ,4) ) +transpose(((transpose(X,-5) +shuffle(arpeggio(step(X,12) ) ) ) +shuffle((step(X,12) +transpose((arpeggio(X) +(X+transpose(X,7) ) ) ,12) ) ) ) ,7) ) +shuffle((X+X) ) ) +transpose(shuffle(transpose(shuffle(X) ,-5) ) ,12) ) +transpose((step(echo(transpose(transpose(arpeggio(X) ,4) ,-5) ,4,6) ,12) +transpose(((transpose(arpeggio((X+transpose(X,7) ) ) ,-5) +arpeggio(X) ) +((transpose(shuffle(X) ,4) +transpose(((X|(X+X) ) |arpeggio(echo(X,4,6) ) ) ,4) ) +transpose((arpeggio(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) ,7) ) ,4) ) +transpose(transpose((((transpose((X+transpose(X,7) ) ,-5) +shuffle((X+transpose(X,7) ) ) ) +((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) ) +transpose(((transpose(X,-7) +transpose((X|X) ,7) ) +transpose(transpose(X,-5) ,12) ) ,7) ) ,-7) ,7) ) ,12) +transpose((transpose((arpeggio(transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose(((arpeggio(step(arpeggio(X) ,12) ) |arpeggio(X) ) +step(shuffle((((X+X) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ) ,12) ) ,12) ) ,-7) |((transpose(((shuffle(X) +transpose((X|X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) +transpose(((X|X) +transpose((shuffle(X) +transpose(arpeggio(X) ,7) ) ,4) ) ,4) ) +transpose(arpeggio(step(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,7) ) ) ,-7) ) +transpose(transpose(transpose(transpose(shuffle(arpeggio((transpose((X+transpose(transpose(X,-7) ,12) ) ,-5) |(((X+X) +echo(X,4,6) ) |(X+transpose(X,7) ) ) ) ) ) ,4) ,-5) ,4) ,12) ) ) ,-5) ) ) ) ,12) )
random seed used was 0

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