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:
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After 20 generations the expression "X" became this:
(((echo(arpeggio(shuffle((shuffle(step((step(arpeggio(X) ,12) |((shuffle(step(echo(step(shuffle((transpose(X,4) +transpose(step(X,12) ,7) ) ) ,12) ,4,6) ,12) ) +transpose(shuffle(shuffle(transpose((X+X) ,-5) ) ) ,12) ) +transpose(step((step(shuffle(X) ,12) +transpose((step(transpose(X,-5) ,12) |(X+transpose(X,12) ) ) ,12) ) ,12) ,7) ) ) ,12) ) +transpose((step(transpose(step((arpeggio((transpose(arpeggio(X) ,-7) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ) +(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,12) ,4) ,12) +transpose(arpeggio((((transpose((((X+transpose(X,7) ) +transpose((X+transpose(((X+transpose(X,7) ) |X) ,12) ) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,12) ) ,4) +transpose(shuffle((X|shuffle(shuffle(X) ) ) ) ,4) ) +transpose(echo((echo(echo(X,4,6) ,4,6) +arpeggio(X) ) ,4,6) ,7) ) |((transpose((((step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) ,12) +transpose((transpose(X,4) +X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((shuffle(shuffle(X) ) |(X+transpose(X,7) ) ) ,7) ) ,4) +transpose(arpeggio(((((X+X) +transpose((X+transpose(X,12) ) ,7) ) +transpose(((X+transpose(X,12) ) +step(X,12) ) ,7) ) +((shuffle((X+transpose(X,12) ) ) |X) +transpose(transpose(X,-5) ,12) ) ) ) ,4) ) +transpose((transpose(X,4) +transpose((transpose(transpose(shuffle(X) ,-7) ,-7) +transpose(X,12) ) ,7) ) ,7) ) ) ) ,7) ) ,12) ) ) ) ,4,6) +transpose((transpose(transpose(shuffle(echo(arpeggio(echo(((((transpose(transpose(X,4) ,-7) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) |(X+X) ) +transpose(echo((arpeggio((transpose(transpose(X,-7) ,-7) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) |step(echo(echo(X,4,6) ,4,6) ,12) ) ,4,6) ,4) ) +transpose((((X+transpose(X,12) ) +transpose((transpose(X,-7) +transpose(shuffle(X) ,12) ) ,7) ) +transpose(((shuffle((X+transpose(X,12) ) ) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,7) ) ,4,6) ) ,4,6) ) ,-7) ,-7) +transpose(step((transpose(echo(step(echo((((arpeggio(transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose((transpose(shuffle(X) ,-5) |transpose(X,4) ) ,7) ) |shuffle(((echo(((X+X) +shuffle(X) ) ,4,6) +transpose(X,4) ) +transpose((arpeggio(X) |X) ,7) ) ) ) ,4,6) ,12) ,4,6) ,-5) |transpose(echo(echo(((shuffle((shuffle((X+transpose(X,7) ) ) +step(step(X,12) ,12) ) ) +transpose(transpose(((((shuffle((X+X) ) +transpose((X|((X+transpose(X,12) ) +X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(echo(((arpeggio(X) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ,-5) ,4) ) +transpose(shuffle(X) ,7) ) ,-5) ,12) ) +transpose((echo((transpose(transpose(X,4) ,-7) |step(shuffle(X) ,12) ) ,4,6) +transpose((transpose((arpeggio((X+X) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) +transpose(echo((X+transpose(((X+X) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,4,6) ,12) ) ,12) ) ,7) ) ,4,6) ,4,6) ,-7) ) ,12) ,12) ) ,4) ) +transpose((shuffle(transpose(echo(transpose((((arpeggio(step(arpeggio(echo(transpose((step((X+transpose(X,7) ) ,12) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,7) ) ,4) ,4,6) ) ,12) ) +transpose((step((echo(X,4,6) +transpose(X,12) ) ,12) |(shuffle(step((X+X) ,12) ) |((X+X) +transpose((((X+transpose((X+X) ,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,-5) ) ,12) ) ) ) ,12) ) +transpose(transpose(((arpeggio(step((X+transpose(X,7) ) ,12) ) +transpose(((arpeggio(X) +transpose(arpeggio(X) ,7) ) |echo(X,4,6) ) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ,-7) ,4) ) +transpose(transpose((step(arpeggio(echo(X,4,6) ) ,12) +(shuffle(echo(X,4,6) ) +transpose((X+X) ,12) ) ) ,-5) ,7) ) ,-7) ,4,6) ,4) ) +transpose(echo((transpose((step(transpose((arpeggio(((echo(echo(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) ,4,6) ,4,6) +transpose((((X+X) +transpose(step(X,12) ,12) ) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,4) ) +transpose(echo(step(echo(X,4,6) ,12) ,4,6) ,7) ) ) +transpose(((step(arpeggio(X) ,12) +transpose(transpose((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(X,-5) ,12) ) ,-5) ,12) ) +transpose(((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) |transpose(step(transpose(X,-7) ,12) ,4) ) ,12) ) ,7) ) ,4) ,12) +transpose(transpose(echo(echo(transpose(transpose(((X+transpose(X,7) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(echo(X,4,6) ,12) ) ,7) ) ,-5) ,-5) ,4,6) ,4,6) ,-7) ,7) ) ,4) |transpose(shuffle((arpeggio(arpeggio((((((transpose(X,-5) +transpose(transpose((X+X) ,4) ,12) ) +arpeggio(X) ) +transpose(X,4) ) +transpose(echo(transpose(echo((X|X) ,4,6) ,4) ,4,6) ,7) ) |echo((arpeggio(transpose(X,4) ) +transpose(((X+transpose(X,12) ) +transpose(transpose(transpose(X,4) ,-7) ,12) ) ,7) ) ,4,6) ) ) ) +transpose(transpose((transpose((transpose(((X+transpose(X,7) ) +X) ,-7) |(((X+X) +transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose(X,4) ,7) ) ) ,4) |((X+X) +transpose((arpeggio(X) +transpose(step((step(((X|X) +transpose(X,12) ) ,12) +transpose(transpose(step(X,12) ,4) ,12) ) ,12) ,12) ) ,7) ) ) ,-7) ,12) ) ) ,4) ) ,4,6) ,12) ) ,7) ) +transpose(step((transpose(shuffle(((((transpose(((shuffle(((arpeggio(X) +transpose(transpose(transpose(X,4) ,4) ,12) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ) +transpose(echo(step(((echo(step(transpose(X,-5) ,12) ,4,6) +transpose(shuffle((X+transpose(X,7) ) ) ,12) ) +transpose(((step((X+transpose(X,7) ) ,12) +transpose((step(X,12) +X) ,12) ) +transpose((transpose(transpose(X,-5) ,-5) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ,7) ) ,7) ) ,12) ,4,6) ,4) ) +transpose(echo((arpeggio(X) +(X+transpose(X,12) ) ) ,4,6) ,7) ) ,-5) +transpose((((((echo(arpeggio(X) ,4,6) +transpose(step(transpose(X,4) ,12) ,12) ) +transpose(((step((X+X) ,12) +arpeggio(X) ) +transpose((arpeggio(X) +(X+transpose(X,12) ) ) ,12) ) ,4) ) +transpose(shuffle(((X+transpose((X+(X+transpose(X,7) ) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) +transpose(((((((X+transpose((X+X) ,4) ) +transpose(X,7) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) +shuffle(transpose(X,-5) ) ) ,7) ) +transpose(((((step(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) +transpose(((X+X) +transpose(X,7) ) ,4) ) +transpose((step(X,12) +echo(X,4,6) ) ,7) ) +((((X+transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ) +(X|((X+transpose(echo((X|X) ,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,12) ) ,7) ) +transpose(transpose(transpose(step(transpose((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ,-7) ,12) ,4) ,-5) ,4) ) +transpose((echo(((echo(((((arpeggio(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ) +transpose((arpeggio(X) |(X+transpose((X+transpose(X,7) ) ,7) ) ) ,4) ) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((echo(X,4,6) |X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) +transpose(((arpeggio(X) +transpose(shuffle(((X+transpose(X,7) ) +transpose(X,12) ) ) ,4) ) +transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,4) ) +transpose((transpose(arpeggio(X) ,4) +(echo(transpose(X,-7) ,4,6) +(X|transpose(X,-5) ) ) ) ,7) ) ,4,6) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(((echo(X,4,6) +transpose(step((X+transpose(shuffle(X) ,7) ) ,12) ,4) ) +transpose(step(step((X+X) ,12) ,12) ,7) ) ,12) ) ,12) ) +transpose((step(shuffle(((shuffle(X) +transpose((transpose(transpose(X,-7) ,-7) +shuffle(X) ) ,7) ) +transpose((((transpose(X,-5) +transpose(X,12) ) |transpose(X,-5) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) ,7) ) ) ,12) +(arpeggio((X+X) ) +transpose(echo(step((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,4,6) ,7) ) ) ,7) ) ,4,6) |step(((((arpeggio(step((((X|X) +transpose((X+transpose(X,7) ) ,7) ) +transpose((X+transpose(X,-7) ) ,7) ) ,12) ) +transpose(((((X+X) |((X|X) |X) ) +transpose((X+transpose(transpose(X,-7) ,12) ) ,12) ) +((X+transpose((X+transpose(X,12) ) ,12) ) +transpose(((X+transpose((X+X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ) ,7) ) +transpose(transpose(((step((X+transpose(X,12) ) ,12) +transpose(transpose(X,-7) ,7) ) +transpose((arpeggio(X) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,7) ) ,-5) ,4) ) +transpose(((echo((((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ,4,6) +transpose(((((transpose(X,-5) +transpose(((X+transpose(X,7) ) +(X+X) ) ,7) ) +transpose((step(X,12) +X) ,4) ) +transpose((X|(X+transpose(X,7) ) ) ,7) ) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,-5) ,12) ) ,4) ) +transpose((transpose(X,-5) +transpose((((X+X) +transpose((X+transpose(X,12) ) ,12) ) +(X|(X+transpose(X,12) ) ) ) ,12) ) ,7) ) ,7) ) +transpose((transpose(((((X+X) +transpose(arpeggio(echo(X,4,6) ) ,7) ) +transpose((echo(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4,6) |X) ,4) ) +transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,-5) +transpose((arpeggio(((X+transpose(echo(X,4,6) ,12) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,-5) ) ) +transpose(arpeggio((transpose((X+transpose((X|X) ,7) ) ,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,12) ) ,12) ) ,7) ) ,12) ) ,7) ) +transpose((step(arpeggio((transpose(X,-5) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-5) ) ) ,12) +transpose(echo((step(((((transpose(X,-5) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X+arpeggio(X) ) ,4) ) +transpose((X+transpose(X,4) ) ,7) ) +step((transpose(X,-5) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,12) ) ,12) +arpeggio((((((transpose(X,-7) +echo(transpose(X,4) ,4,6) ) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |((arpeggio(X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose((transpose(X,-5) |X) ,-7) ,7) ) +transpose((((((X+transpose(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) +transpose(echo((X+transpose(echo(X,4,6) ,12) ) ,4,6) ,7) ) +transpose((((X+transpose(X,7) ) +step(X,12) ) +arpeggio(X) ) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-5) ,4) ,7) ) ,4) ) +transpose(echo((echo((X+echo(X,4,6) ) ,4,6) +transpose(arpeggio(shuffle(X) ) ,7) ) ,4,6) ,7) ) ) ) ,4,6) ,7) ) ,7) ) ) ,-5) |step(step((shuffle(transpose(transpose((transpose(step(((X+transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ,4) +transpose(shuffle((((transpose(X,-7) +transpose((arpeggio(X) +transpose(transpose(X,-5) ,7) ) ,7) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) ,4) ,-5) ) +transpose(arpeggio(((((echo(step(((X+transpose(X,12) ) |X) ,12) ,4,6) +transpose((shuffle(echo(X,4,6) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ,7) ) +transpose(transpose(((X+transpose(X,7) ) +X) ,-5) ,7) ) +(shuffle(step(X,12) ) +transpose(((X+transpose(arpeggio(shuffle(X) ) ,12) ) +transpose((X+transpose(transpose(arpeggio(X) ,-7) ,12) ) ,7) ) ,12) ) ) +transpose((transpose((((step(shuffle(X) ,12) +transpose(((transpose(X,-7) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) +((X|(X+transpose(X,12) ) ) +transpose((echo((X+transpose(X,7) ) ,4,6) |(X|X) ) ,12) ) ) +step(X,12) ) ,-7) +transpose(transpose(echo((transpose(((transpose(X,-5) |echo(X,4,6) ) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ) ,-7) +transpose((echo((X+transpose(X,12) ) ,4,6) +transpose(transpose((X+arpeggio(X) ) ,-5) ,7) ) ,7) ) ,4,6) ,-7) ,12) ) ,12) ) ) ,12) ) ,12) ,12) ) ,12) ,12) )
random seed used was 241572845

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