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:
(step((transpose(transpose(step(transpose(step((X+transpose(X,12) ) ,12) ,4) ,12) ,-5) ,-7) +(arpeggio(shuffle(shuffle(((echo((transpose(X,-5) +transpose(X,4) ) ,4,6) +transpose((X+transpose(step(X,12) ,12) ) ,4) ) +transpose((X+X) ,7) ) ) ) ) |echo(transpose(((transpose(echo(transpose(X,-5) ,4,6) ,-7) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +step((X|X) ,12) ) ,12) ) +transpose(((shuffle(shuffle(X) ) +transpose((transpose(X,4) |echo(X,4,6) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,4) ,4,6) ) ) ,12) +transpose(transpose((((((transpose((((((X|X) +transpose((arpeggio(X) +transpose(X,7) ) ,7) ) +((X+X) +transpose((step(X,12) +transpose((X|X) ,12) ) ,7) ) ) |(((X+X) +transpose(X,12) ) |transpose(X,-5) ) ) |((X|X) |echo(((X+transpose((X|X) ,12) ) |(echo(X,4,6) +(X+X) ) ) ,4,6) ) ) ,-5) +transpose(arpeggio(shuffle(transpose(((X+transpose(X,7) ) |arpeggio(echo((X+transpose(X,12) ) ,4,6) ) ) ,-7) ) ) ,4) ) +transpose(transpose(transpose((transpose(X,4) |step(arpeggio(transpose(X,-7) ) ,12) ) ,4) ,4) ,7) ) +((step(((((((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X+transpose(arpeggio(X) ,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |(X|transpose(X,4) ) ) +transpose(transpose((X|transpose(X,4) ) ,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) +(((X+transpose(X,7) ) |echo(arpeggio(X) ,4,6) ) +transpose(shuffle((transpose(X,4) +transpose((X+transpose((X+X) ,12) ) ,7) ) ) ,12) ) ) |transpose((arpeggio(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ) +step((((step(X,12) +(step(X,12) +transpose(arpeggio(X) ,7) ) ) +transpose(transpose(X,-5) ,4) ) +transpose((X|transpose(transpose(X,-7) ,-7) ) ,7) ) ,12) ) ,-5) ) ) +transpose(transpose(((((transpose(transpose(X,-7) ,4) +transpose((X+transpose(step(X,12) ,7) ) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) +transpose((step(X,12) |(X+transpose(X,12) ) ) ,7) ) +transpose(echo((echo(shuffle((X+transpose(X,12) ) ) ,4,6) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose((X+X) ,-7) ,12) ) ) ,4,6) ,7) ) ,4) ,12) ) +transpose(transpose(transpose(((echo(X,4,6) +(transpose(X,-7) |(X+transpose(X,7) ) ) ) |((transpose(transpose(X,4) ,-7) |transpose(X,-7) ) +transpose(transpose(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ,-5) ,12) ) ) ,4) ,-7) ,-7) ) ,-7) ,12) )
random seed used was 12 EXPR = transpose(((transpose((((shuffle((shuffle(step(X,12) ) +transpose((transpose(X,-7) +transpose((X|X) ,7) ) ,12) ) ) +transpose(((arpeggio(((arpeggio(X) +transpose((X|X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +(transpose(step(X,12) ,4) +X) ) |arpeggio((X|transpose(X,-5) ) ) ) ,12) ) |transpose(((transpose(X,4) +transpose((shuffle(X) +transpose(transpose(X,4) ,12) ) ,7) ) +transpose((step(transpose((X+transpose(X,12) ) ,4) ,12) |((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,12) ) ,4) ) |shuffle((transpose((X+transpose(transpose(transpose(X,4) ,-7) ,12) ) ,4) +(((step(X,12) +transpose((transpose((X+X) ,-5) +arpeggio(X) ) ,4) ) +transpose(transpose(X,-5) ,7) ) |(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) |transpose(X,4) ) ) ) ) ) ,4) +transpose(transpose((((transpose(transpose((transpose(transpose(X,4) ,4) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,4) ,4) |step(((transpose(transpose((X|X) ,-5) ,4) +transpose((((X+transpose((X+transpose(X,7) ) ,12) ) |X) +(X+transpose((transpose(X,-7) +(X|X) ) ,12) ) ) ,4) ) +transpose((transpose((X+transpose(X,7) ) ,-5) |shuffle(X) ) ,7) ) ,12) ) +transpose(((transpose(((transpose(X,4) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,-5) |(step((X+X) ,12) +transpose(transpose((X|X) ,-7) ,7) ) ) +transpose(transpose((shuffle(transpose(X,-5) ) +(step(X,12) |(transpose((X+X) ,4) +transpose(transpose(transpose(X,-5) ,4) ,12) ) ) ) ,4) ,12) ) ,4) ) +transpose(transpose((echo(X,4,6) +transpose(transpose(X,-7) ,4) ) ,-7) ,7) ) ,-7) ,4) ) +transpose(((transpose(((transpose(echo(shuffle(X) ,4,6) ,4) +transpose(transpose(((((transpose(transpose(X,4) ,4) |(X+transpose((X+transpose(X,12) ) ,7) ) ) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(transpose(echo((X|X) ,4,6) ,-5) ,7) ) +transpose((arpeggio((transpose(X,-5) +transpose(X,12) ) ) |(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +step((X+transpose(X,7) ) ,12) ) ) ,12) ) ,-7) ,4) ) +transpose(transpose(transpose((((((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) |((((X|X) +transpose((X+X) ,12) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) |echo((X+transpose(X,12) ) ,4,6) ) +transpose(transpose(arpeggio(X) ,-5) ,-5) ) ,4) ,4) ,7) ) ,-5) +transpose(shuffle(transpose((transpose((transpose(arpeggio(X) ,4) +transpose((X|X) ,12) ) ,-5) |((echo((transpose(X,-5) +transpose(((echo(X,4,6) |arpeggio(X) ) +X) ,12) ) ,4,6) +transpose(transpose((transpose(X,-7) |((X|X) +transpose((X+X) ,12) ) ) ,4) ,7) ) +transpose(shuffle(transpose(X,-5) ) ,12) ) ) ,-7) ) ,7) ) +transpose((((transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) ,-7) ,-5) +transpose(shuffle(((transpose(X,-5) +X) |transpose(((echo(X,4,6) +transpose(X,7) ) +(transpose(X,-5) |(X+X) ) ) ,-5) ) ) ,4) ) +transpose(transpose(transpose(step(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(((transpose(X,-7) |((transpose(X,-7) +transpose(X,4) ) +transpose((X|X) ,7) ) ) +transpose(step(((X+transpose((X|X) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ,12) ) ,4) ) +transpose((transpose(X,-5) |echo(transpose(transpose(X,-5) ,4) ,4,6) ) ,7) ) ,12) ,-5) ,4) ,7) ) +transpose(((((transpose(transpose(transpose((X+(X+transpose(X,12) ) ) ,-7) ,-5) ,4) |shuffle(arpeggio(shuffle(X) ) ) ) +transpose(((transpose(X,-7) +transpose(((X+X) +transpose(transpose(X,-5) ,12) ) ,12) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) ) ,-7) ) +transpose(transpose((arpeggio(((X|X) +X) ) +arpeggio(((step(X,12) +(X+transpose(((X+X) +transpose(shuffle(X) ,12) ) ,7) ) ) |((arpeggio(X) +transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose(X,7) ) ) ) ) ,4) ,4) ) +transpose(((((((transpose(X,4) +transpose((X+X) ,7) ) +(X+X) ) +transpose(((echo(X,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose((X|X) ,-5) ,7) ) ,12) ) |shuffle((echo(transpose(X,4) ,4,6) |transpose(transpose(X,4) ,-5) ) ) ) +step(transpose(echo(X,4,6) ,4) ,12) ) +transpose((((transpose((X+X) ,-7) +transpose(X,4) ) +transpose(transpose((X+echo((X+X) ,4,6) ) ,-5) ,4) ) +transpose((transpose(transpose(X,4) ,4) +transpose(step(transpose((X|X) ,-5) ,12) ,7) ) ,7) ) ,12) ) ,7) ) ,12) ) ,7) ) ,7) ) ,4)
random seed used was 0 EXPR = (transpose(arpeggio((transpose(((transpose((transpose(X,4) +shuffle(arpeggio(X) ) ) ,4) +transpose((arpeggio(X) +transpose(((X+X) +step(X,12) ) ,7) ) ,7) ) |step(shuffle(transpose(((echo(X,4,6) +transpose((X|X) ,7) ) +transpose((transpose((X+transpose(X,7) ) ,-5) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) ,7) ) ,-5) ) ,12) ) ,4) +transpose((((echo(X,4,6) +transpose(transpose(((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,-7) ,4) ) +transpose(echo((transpose(X,-7) |step((X+transpose(X,12) ) ,12) ) ,4,6) ,7) ) |transpose(transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |(X+step(X,12) ) ) ,-7) ,4) ,-5) ) ,12) ) ) ,4) +step(shuffle(transpose(transpose(transpose(echo(((((shuffle((X+X) ) +transpose(X,12) ) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(transpose((X|transpose(X,-5) ) ,-7) ,7) ) +transpose(transpose((((X|(X+transpose(X,12) ) ) +(transpose(X,-7) +transpose(X,12) ) ) +((X+transpose(X,12) ) |(shuffle(X) |X) ) ) ,-5) ,12) ) ,4,6) ,4) ,4) ,-5) ) ,12) )
random seed used was 0 EXPR = transpose(step(transpose(((echo(transpose(X,-7) ,4,6) +transpose((((((X|X) +(((X+X) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) +(X+transpose(transpose(X,-5) ,12) ) ) +transpose(transpose((transpose(X,-7) |arpeggio(X) ) ,-5) ,4) ) +transpose(echo(arpeggio(transpose(X,-7) ) ,4,6) ,7) ) ,4) ) +transpose((((((shuffle(X) +transpose(transpose(X,-5) ,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(((step(X,12) +transpose(echo(X,4,6) ,12) ) +transpose(X,-7) ) ,7) ) +(shuffle(X) +((arpeggio(arpeggio(X) ) +(X+X) ) +((X+transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ) ,7) ) ,-5) ,12) ,-5)
random seed used was 0

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