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:
(((transpose((((shuffle((echo((arpeggio((X|X) ) +transpose(step(echo(X,4,6) ,12) ,7) ) ,4,6) +shuffle(transpose((shuffle(echo(X,4,6) ) +transpose(transpose(X,-7) ,7) ) ,4) ) ) ) |step(((transpose(X,-7) +transpose((X+X) ,12) ) +transpose(((((arpeggio(X) +transpose((X+X) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(step(step((X+transpose(X,7) ) ,12) ,12) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,12) ) +shuffle((arpeggio(((transpose((X+transpose(echo(X,4,6) ,7) ) ,-7) |(step(X,12) |step(transpose(X,4) ,12) ) ) +transpose((((((X+X) +shuffle(X) ) +transpose(transpose(X,4) ,7) ) +transpose(((arpeggio(arpeggio(echo(X,4,6) ) ) +transpose(X,4) ) +transpose(((step(X,12) |transpose(X,-7) ) +transpose(((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(echo(echo(X,4,6) ,4,6) ,4) ,7) ) ,7) ) ) +step(transpose(arpeggio(echo((arpeggio(X) +transpose(step(step(X,12) ,12) ,7) ) ,4,6) ) ,4) ,12) ) ) ) +transpose((((((transpose((((((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(((X+echo(X,4,6) ) +transpose(((X+X) +transpose(arpeggio(X) ,7) ) ,12) ) ,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) +transpose(step((((X+transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ) ,12) ,12) ) ,4) +transpose((((shuffle((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose((X|transpose(step(X,12) ,-7) ) ,7) ) +transpose(step(arpeggio((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) ,12) ,7) ) ,4) ) +transpose((echo((step(X,12) +transpose(shuffle((X+X) ) ,7) ) ,4,6) |(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +(X+X) ) ) ,7) ) +transpose((transpose(step(X,12) ,4) +(step(transpose(step((arpeggio(transpose(X,-7) ) |((X+transpose(X,7) ) +transpose(step(X,12) ,7) ) ) ,12) ,4) ,12) +(echo(transpose(echo((X+transpose((X|X) ,7) ) ,4,6) ,-7) ,4,6) +transpose(((echo(X,4,6) +transpose(arpeggio(X) ,12) ) +transpose(((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,4) ) ) ) ,7) ) +transpose((((((((echo(X,4,6) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((arpeggio(X) |X) ,7) ) +(echo(arpeggio(X) ,4,6) +transpose(transpose(arpeggio(((X+transpose(X,7) ) +X) ) ,-5) ,7) ) ) |step(transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ,4) ,12) ) +transpose((((transpose(arpeggio((step(X,12) +echo(X,4,6) ) ) ,4) +transpose(shuffle(transpose(shuffle(X) ,-5) ) ,4) ) +transpose(((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose((X|(X+transpose(X,7) ) ) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) |transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-7) ,-5) ) |((X+arpeggio(X) ) +transpose(step((X+arpeggio(X) ) ,12) ,12) ) ) ,7) ) +transpose(echo(echo(transpose(X,4) ,4,6) ,4,6) ,-7) ) ,4) ) +transpose((((echo(transpose((echo(transpose(X,-7) ,4,6) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,7) ) ,-7) ,4,6) +transpose(transpose(echo(((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |shuffle(echo(X,4,6) ) ) ,4,6) ,4) ,4) ) +transpose(echo(arpeggio(shuffle((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ) ,4,6) ,7) ) |echo(transpose(((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) ,4,6) ) ,7) ) ,4) ) +transpose(transpose((shuffle(arpeggio((((step(X,12) +transpose((step(X,12) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((((X+(X|X) ) +transpose(step(X,12) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ) ) +transpose(arpeggio(((step(echo(((shuffle(X) +transpose(transpose(step(X,12) ,-5) ,4) ) +transpose(X,7) ) ,4,6) ,12) +transpose(((shuffle((transpose(echo(X,4,6) ,4) |((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ) ) +transpose(((X|step(X,12) ) +transpose(X,-7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) ) ,7) ) ,-5) ,7) ) ,7) ) ,-5) +transpose(arpeggio(((step((((((((((X|X) +shuffle(X) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) +transpose(((shuffle(step(X,12) ) +transpose(step((X+X) ,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose((X+echo(X,4,6) ) ,7) ) +transpose(((((X|X) +transpose((transpose(X,4) |X) ,4) ) +transpose(X,7) ) +transpose((arpeggio(X) +transpose(arpeggio(X) ,7) ) ,7) ) ,4) ) +transpose((arpeggio(arpeggio(X) ) +arpeggio((arpeggio(X) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ) ) ,7) ) +(((echo(transpose(step(X,12) ,4) ,4,6) +transpose(echo(echo(((X|X) |X) ,4,6) ,4,6) ,7) ) +echo(shuffle(((step(X,12) +transpose(step((X+transpose(X,7) ) ,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4,6) ) +arpeggio(arpeggio((X+transpose(shuffle(X) ,7) ) ) ) ) ) ,12) +transpose((((step(step((arpeggio(X) +transpose(echo(X,4,6) ,-5) ) ,12) ,12) +transpose(((echo((shuffle(X) +transpose((arpeggio(arpeggio(X) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,4,6) +transpose(arpeggio(arpeggio(step(transpose(X,-5) ,12) ) ) ,7) ) +transpose(transpose(step(echo(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ,4,6) ,12) ,4) ,12) ) ,7) ) +transpose(echo(echo(transpose(((echo(X,4,6) +transpose(step(X,12) ,7) ) +step(transpose((X+transpose(X,7) ) ,-5) ,12) ) ,4) ,4,6) ,4,6) ,4) ) +transpose((step(transpose(((step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) +transpose(transpose(((arpeggio(arpeggio(X) ) +transpose((X+transpose(shuffle(X) ,12) ) ,4) ) +transpose(step(X,12) ,7) ) ,-5) ,4) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,-5) ,12) +transpose(transpose(echo(shuffle(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ) ,4,6) ,-7) ,12) ) ,7) ) ,4) ) +transpose(((step((echo(shuffle(X) ,4,6) +transpose(arpeggio(transpose(((step(echo(step((X+transpose(X,12) ) ,12) ,4,6) ,12) +transpose(step(echo(X,4,6) ,12) ,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,-5) ) ,12) ) ,12) +transpose(((transpose(transpose(transpose(echo(X,4,6) ,-5) ,4) ,4) +transpose(step(((transpose(X,-7) +transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) ,12) ,7) ) +(X+X) ) ,12) ) +transpose(echo(transpose(((step(echo(arpeggio(((X|transpose(X,-5) ) +transpose(X,12) ) ) ,4,6) ,12) +transpose((shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +(((transpose(X,4) +transpose((X+X) ,4) ) +transpose(X,7) ) +transpose(((X|X) +transpose(arpeggio(X) ,7) ) ,7) ) ) ,4) ) +transpose(arpeggio(((shuffle(X) +transpose(((transpose(X,-7) |(X+(X|X) ) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,4) ) +transpose(step(((X+transpose(arpeggio(X) ,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,12) ,7) ) ) ,7) ) ,-5) ,4,6) ,7) ) ,7) ) ) ,7) ) +transpose(transpose(shuffle((transpose(arpeggio(((transpose(((arpeggio(step(((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(X,7) ) ,12) ) +transpose(transpose(X,-7) ,7) ) |((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) |echo(X,4,6) ) ) ,-7) +transpose(transpose(transpose(((step((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,12) +transpose((transpose(X,4) +(arpeggio(X) |X) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,-7) ,7) ) |echo(transpose((((shuffle((transpose((X+X) ,-5) +transpose(arpeggio(step(X,12) ) ,12) ) ) +transpose(step(step(echo((X+transpose(X,12) ) ,4,6) ,12) ,12) ,4) ) +transpose(step((arpeggio(step((shuffle(X) +shuffle(X) ) ,12) ) +transpose(echo((((X+transpose((X|X) ,4) ) +transpose((X+X) ,7) ) +transpose(arpeggio(transpose(step(X,12) ,-5) ) ,7) ) ,4,6) ,12) ) ,12) ,7) ) +transpose((arpeggio(arpeggio(step((X+transpose(X,7) ) ,12) ) ) |(echo((step(X,12) |X) ,4,6) +transpose(step(transpose(((X+X) +transpose(X,7) ) ,4) ,12) ,12) ) ) ,7) ) ,4) ,4,6) ) ) ,4) +transpose(arpeggio(transpose((((echo(arpeggio((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |X) ) ,4,6) +transpose(transpose(arpeggio(shuffle(step(((echo(transpose(X,-7) ,4,6) +transpose((X+transpose(transpose(X,4) ,12) ) ,7) ) +transpose(X,7) ) ,12) ) ) ,-5) ,12) ) +transpose(echo(echo(((((((X+shuffle(X) ) +transpose(((transpose(echo(X,4,6) ,4) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose((echo(X,4,6) +transpose((echo(X,4,6) +(X|X) ) ,7) ) ,7) ) +echo((X+transpose(X,7) ) ,4,6) ) +transpose(((step(transpose(X,-5) ,12) +transpose((X|echo(X,4,6) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,4) ) +transpose((step((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(X,-7) ,7) ) ,12) +transpose(((((X+transpose((X+X) ,7) ) +transpose(step(X,12) ,4) ) +transpose(step(X,12) ,7) ) +(shuffle(X) +X) ) ,7) ) ,7) ) ,4,6) ,4,6) ,4) ) +transpose(arpeggio(((transpose(transpose(transpose((shuffle(X) |(X|X) ) ,-5) ,4) ,-7) +transpose(arpeggio(arpeggio(arpeggio(step(arpeggio(X) ,12) ) ) ) ,4) ) +transpose(((transpose(echo((X+transpose(X,7) ) ,4,6) ,-7) +(((X+transpose(X,7) ) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose((X+X) ,7) ) ) |(X+transpose(X,7) ) ) ,7) ) ) ,7) ) ,-5) ) ,-5) ) ) ,-7) ,4) ) +transpose(shuffle(arpeggio(((shuffle((transpose(((step((arpeggio(X) +transpose(step(X,12) ,7) ) ,12) +transpose(transpose((X+arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ) ) ,-5) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,4) +transpose((((transpose(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,4) ,4) |((echo((echo(arpeggio(X) ,4,6) |(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,4,6) +transpose(arpeggio((arpeggio((X|X) ) |((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) ) ,4) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ,7) ) ) +transpose((shuffle(((arpeggio(X) +transpose(transpose(X,-5) ,4) ) +transpose(step(X,12) ,7) ) ) +(echo(X,4,6) +transpose(X,7) ) ) ,4) ) +transpose((transpose(X,4) |shuffle(arpeggio(step(X,12) ) ) ) ,7) ) ,7) ) ) |step(step(echo(arpeggio(shuffle((((transpose(X,-7) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) ) ) ,4,6) ,12) ,12) ) +transpose((step((((echo(step(step(X,12) ,12) ,4,6) |(step(transpose(X,-5) ,12) +transpose(echo(X,4,6) ,12) ) ) +transpose(echo(((transpose(X,-7) +transpose(echo(X,4,6) ,7) ) +echo(arpeggio(X) ,4,6) ) ,4,6) ,7) ) +arpeggio(step(((transpose(X,4) |X) +transpose((X|X) ,7) ) ,12) ) ) ,12) +transpose(shuffle((arpeggio(arpeggio(((step(arpeggio(X) ,12) +echo(step(X,12) ,4,6) ) +echo(X,4,6) ) ) ) +transpose(echo((((echo(echo(transpose(((X+transpose(X,7) ) |X) ,-7) ,4,6) ,4,6) +transpose(transpose((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,7) ) ,-5) ,7) ) +transpose((transpose((arpeggio(X) |transpose((X+transpose(X,7) ) ,-5) ) ,-5) +transpose((transpose(step(shuffle(X) ,12) ,-5) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X|X) ,7) ) ) ,12) ) ,12) ) +transpose(step((((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(arpeggio(arpeggio(X) ) ,4,6) ,7) ) +transpose((X|((X+transpose(X,7) ) |X) ) ,12) ) ,12) ,12) ) ,4,6) ,7) ) ) ,12) ) ,7) ) ) ) ,7) )
random seed used was 218683367

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