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(echo(((((transpose((((transpose((echo(X,4,6) |shuffle(shuffle(X) ) ) ,4) +transpose(transpose(step((transpose(X,-5) |transpose(X,-5) ) ,12) ,-7) ,4) ) +transpose(((((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +((transpose(X,4) +transpose((step(X,12) +transpose((X+transpose(X,7) ) ,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) |arpeggio(X) ) +transpose(((shuffle(X) +arpeggio(X) ) +(X|X) ) ,12) ) |(step(((transpose(X,4) +transpose(echo(X,4,6) ,7) ) |transpose(X,-5) ) ,12) +transpose((X+transpose(X,7) ) ,4) ) ) ,7) ) |((step((transpose(X,-7) |(X+X) ) ,12) +transpose((step((transpose(transpose(X,-7) ,4) |transpose((X|X) ,4) ) ,12) +transpose(transpose(transpose(((transpose((X+(X+X) ) ,4) +transpose(X,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,-5) ,4) ,12) ) ,4) ) +transpose(echo(transpose(step(transpose(X,-5) ,12) ,4) ,4,6) ,7) ) ) ,4) +transpose(((((transpose((transpose(((X|X) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ) ,-5) +transpose((((X|X) +transpose(X,12) ) |transpose((transpose(X,4) +transpose((X+X) ,7) ) ,-7) ) ,-7) ) ,4) +transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,4) ) +transpose((transpose(((((X+transpose(X,4) ) +transpose((X|X) ,7) ) |transpose((X|X) ,-5) ) +((X+transpose(shuffle(X) ,4) ) +transpose((X+transpose((X+X) ,7) ) ,7) ) ) ,-5) +transpose(transpose(transpose(transpose((transpose(transpose(X,-5) ,4) +transpose((X|(X|X) ) ,4) ) ,-5) ,4) ,-5) ,7) ) ,7) ) +transpose(arpeggio(transpose(((X+X) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-7) ) ,4) ) +transpose(((echo(transpose(X,-5) ,4,6) |transpose((transpose(X,-5) +transpose(transpose(((X+transpose(X,7) ) +transpose(X,-7) ) ,-5) ,7) ) ,4) ) |transpose(transpose((((transpose(arpeggio(((X|X) +transpose(transpose(X,-5) ,7) ) ) ,-5) +step(transpose(transpose(X,-5) ,-5) ,12) ) +transpose(transpose(shuffle(transpose((X+transpose(X,7) ) ,-7) ) ,4) ,4) ) +transpose((shuffle(arpeggio(step(X,12) ) ) +transpose(((echo(X,4,6) +transpose(transpose(X,4) ,-5) ) |(X+X) ) ,7) ) ,7) ) ,4) ,-5) ) ,7) ) ,4) ) +transpose(echo(step(transpose((transpose(((((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) +echo(X,4,6) ) +transpose(transpose((X+X) ,4) ,-7) ) ,-7) |((((X+transpose(X,12) ) |(transpose(X,-5) +transpose(X,7) ) ) +((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(step((X|X) ,12) ,12) ) ) +transpose(((arpeggio(step(X,12) ) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +(X+transpose(X,7) ) ) ,12) ) ) ,-5) ,12) ,4,6) ,7) ) +transpose((((transpose(shuffle(transpose(X,-5) ) ,4) |((transpose(transpose(transpose(X,-7) ,-5) ,4) |transpose((X+((transpose(X,4) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ) ,-5) ) +(shuffle(transpose(X,-5) ) +(((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) ) ) ) +step(((echo(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ,4,6) |((step(X,12) +transpose((X|X) ,12) ) |(X|X) ) ) +transpose(((transpose(X,4) |X) +(transpose(X,-7) +X) ) ,4) ) ,12) ) +(((transpose(((transpose(transpose(echo(X,4,6) ,-7) ,4) +((((transpose(X,4) +transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) +((X+X) +transpose(X,-5) ) ) ) |((((X+transpose(X,12) ) +transpose(X,-5) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,7) ) ) ,-7) +transpose((transpose(echo(transpose(transpose(X,-7) ,-5) ,4,6) ,-5) |transpose(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,-7) ) ,4) ) +transpose(((transpose(((transpose(X,-7) +transpose((X+X) ,7) ) +transpose(transpose(X,-7) ,-5) ) ,4) +echo((step(transpose(X,4) ,12) +transpose(((X+transpose(X,7) ) +transpose(X,-7) ) ,7) ) ,4,6) ) +transpose((transpose((transpose(X,-7) +transpose(X,7) ) ,-7) +transpose((transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) |transpose(echo(X,4,6) ,-5) ) ,12) ) ,12) ) ,7) ) +transpose((transpose(transpose(((X+transpose((transpose(transpose(X,-5) ,-5) |((X|X) +transpose(X,12) ) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ,4) +transpose((transpose(X,-5) +(step(X,12) |transpose(X,-5) ) ) ,7) ) ,7) ) ) ,12) ) |arpeggio((((transpose(transpose(transpose(((X|X) +(X+X) ) ,4) ,-7) ,-7) +((transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,-7) |arpeggio((X+X) ) ) +transpose(((((X+transpose(X,12) ) |(step(X,12) |shuffle(X) ) ) |((X|X) +(X+transpose(X,12) ) ) ) +((transpose(X,-7) +((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +((X+transpose(X,-7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,12) ) ) ) ,12) ) ) +transpose(echo(step(transpose(step(X,12) ,4) ,12) ,4,6) ,12) ) +transpose(transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ,4) ,-5) ) ) ) ,4,6) ,-7) +transpose((arpeggio((transpose((transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) |(transpose(X,4) +transpose(step(transpose(X,-7) ,12) ,7) ) ) ,4,6) ,-5) +transpose(((transpose(transpose((X|X) ,-7) ,4) |transpose(((transpose(X,4) +shuffle(X) ) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) +((transpose(arpeggio(transpose(transpose(X,-5) ,4) ) ,-5) +transpose(transpose((transpose(X,-7) +(X|X) ) ,4) ,7) ) +echo((shuffle(X) +transpose((transpose((X+transpose(transpose(X,-7) ,7) ) ,-5) +transpose((transpose(X,-5) +transpose(X,7) ) ,-5) ) ,12) ) ,4,6) ) ) ,-5) ) ,-7) +transpose(transpose(transpose(transpose(((transpose((transpose(transpose((transpose(((X+transpose(X,12) ) |X) ,-7) +transpose(echo((X|X) ,4,6) ,12) ) ,4) ,-5) |((((transpose(shuffle(X) ,4) +transpose((X+transpose((X+X) ,12) ) ,7) ) +transpose(((X|X) |X) ,4) ) +transpose(arpeggio(transpose((X+X) ,-7) ) ,7) ) +transpose(transpose(arpeggio(arpeggio(((X+transpose(X,7) ) +X) ) ) ,-7) ,12) ) ) ,-7) +transpose(transpose(step(transpose(transpose((((X+transpose(X,12) ) |X) +transpose(transpose(X,-5) ,-5) ) ,-7) ,-7) ,12) ,-5) ,4) ) +transpose(((((((X+X) +arpeggio(X) ) |(X+X) ) +X) +transpose(arpeggio(step(arpeggio(X) ,12) ) ,12) ) +transpose((((step((X+arpeggio(X) ) ,12) +transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,7) ) ) ,-7) ,-5) ,4) ) +transpose(transpose(arpeggio(transpose(X,4) ) ,4) ,7) ) |(((transpose((transpose((X+X) ,-5) +transpose(transpose(X,-5) ,12) ) ,4) +step((step(X,12) |((X|X) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(X,7) ) ) ) ,12) ) +transpose((((X|X) +((X+X) +transpose(X,7) ) ) +shuffle(shuffle((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ) ) ,12) ) +(arpeggio(((arpeggio(echo(X,4,6) ) |arpeggio((X|X) ) ) +transpose(shuffle(transpose(X,4) ) ,12) ) ) +transpose(arpeggio(step((((transpose((X+transpose(X,7) ) ,-7) +transpose(X,4) ) +transpose((X+step(X,12) ) ,7) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) ,4) ,7) ) ,12) ) ,12) ) ) ) ,12) ) ,7) ) ,-5) ,4) ,-7) ,-7) ) ) |(echo((transpose(transpose((shuffle((shuffle(shuffle(((shuffle(X) +transpose(transpose(step(X,12) ,-7) ,12) ) +transpose(X,-7) ) ) ) +transpose((transpose(transpose(arpeggio(transpose(transpose(X,-7) ,-5) ) ,-5) ,-7) +transpose(transpose((transpose(transpose(X,-7) ,-7) |echo(step(X,12) ,4,6) ) ,4) ,-5) ) ,12) ) ) |transpose(echo((transpose(step(X,12) ,4) +(transpose((X|(X+transpose(X,12) ) ) ,4) +transpose((transpose(X,-5) |X) ,-7) ) ) ,4,6) ,-5) ) ,-5) ,4) |arpeggio((transpose((transpose((step(((X+transpose(X,7) ) |step(X,12) ) ,12) +transpose((X+X) ,-5) ) ,-7) +(transpose(arpeggio(transpose(X,-7) ) ,-5) +transpose(arpeggio(((transpose(X,-7) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ) ,12) ) ) ,-5) |(((step((transpose((X+transpose(X,7) ) ,-7) +arpeggio(X) ) ,12) +transpose((transpose(echo(X,4,6) ,-5) +transpose(((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) ,7) ) ,4) ) +transpose((((transpose((X|X) ,4) +transpose(X,4) ) +transpose(X,7) ) +transpose(echo((shuffle(X) +transpose(X,-7) ) ,4,6) ,7) ) ,7) ) +(((X+X) |transpose(X,-7) ) |step(X,12) ) ) ) ) ) ,4,6) +shuffle(arpeggio(((((arpeggio(transpose(transpose(shuffle(((X|(X+transpose(X,12) ) ) +transpose(X,4) ) ) ,-5) ,4) ) +(transpose(((transpose(transpose(transpose(transpose(echo(X,4,6) ,-7) ,-7) ,4) ,-5) +(((arpeggio((X+transpose(X,12) ) ) +transpose((step(transpose(X,-5) ,12) +transpose(step(X,12) ,12) ) ,7) ) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,4) ,7) ) |(step(transpose(transpose(X,-7) ,-5) ,12) +((echo(X,4,6) +transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) ) ) ) +transpose((arpeggio(echo(((X+X) |X) ,4,6) ) +transpose(transpose((arpeggio(transpose(X,-7) ) +transpose((X+transpose(X,12) ) ,12) ) ,4) ,7) ) ,12) ) ,4) +transpose((((shuffle(((arpeggio(transpose(X,-5) ) +step((X+X) ,12) ) |echo((X+transpose(X,12) ) ,4,6) ) ) +transpose((transpose(X,4) |shuffle(transpose(transpose(shuffle(X) ,4) ,-7) ) ) ,7) ) +arpeggio((((((X+X) |transpose((X+X) ,-7) ) +transpose(transpose(X,4) ,-7) ) +transpose(((X|X) +transpose((X+shuffle(X) ) ,7) ) ,4) ) +transpose(((transpose(X,-5) +transpose((transpose(X,-7) +transpose(X,12) ) ,7) ) +transpose(transpose(transpose(arpeggio((X+X) ) ,4) ,-7) ,7) ) ,7) ) ) ) +(transpose(transpose(echo((((shuffle(arpeggio(X) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose((transpose(X,-7) |(X+X) ) ,12) ) ) +transpose(transpose((transpose(transpose(X,4) ,4) +transpose(((X|X) +(X+transpose(X,7) ) ) ,7) ) ,-5) ,4) ) +transpose(((X+transpose((X+X) ,12) ) +transpose((X|X) ,7) ) ,7) ) ,4,6) ,-7) ,-7) |((transpose((shuffle(shuffle(X) ) |transpose((X+transpose(X,7) ) ,4) ) ,-7) +transpose(step(echo(step((X|X) ,12) ,4,6) ,12) ,7) ) |arpeggio(transpose(transpose(transpose((step(X,12) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ,-5) ,-5) ) ) ) ) ,4) ) ) +transpose(arpeggio(((transpose((transpose((transpose(X,4) +transpose(shuffle(X) ,12) ) ,-7) |((X+transpose(X,-7) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ) ,-5) +transpose(shuffle(X) ,4) ) +transpose((transpose(shuffle(transpose(step(((X|X) +transpose(X,7) ) ,12) ,-5) ) ,-7) |(transpose((((transpose(X,4) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(X,7) ) +transpose(((X+X) +(((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) ) ,4) ) ,4) +(shuffle(X) +(transpose(X,-5) +transpose((X+transpose((X|X) ,7) ) ,7) ) ) ) ) ,7) ) ) ,4) ) +transpose(transpose((transpose((transpose(X,-7) +transpose(X,7) ) ,4) |transpose(transpose(transpose(transpose(echo((X|X) ,4,6) ,-5) ,-5) ,-7) ,-5) ) ,4) ,7) ) +transpose(((transpose((((transpose((((X+transpose(((X+X) |echo(X,4,6) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(X,-5) ,4) ) ,4) +transpose((transpose(X,-7) +transpose(step(X,12) ,12) ) ,12) ) +((transpose((arpeggio(X) +transpose(X,7) ) ,4) +transpose(transpose(X,-7) ,4) ) +transpose(((shuffle(transpose((X|X) ,4) ) +transpose((arpeggio(X) +transpose(X,-7) ) ,4) ) +transpose(((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(((X+X) |(X+transpose(X,7) ) ) ,7) ) ,7) ) ,7) ) ) +(transpose(transpose(((X|X) +transpose(step(X,12) ,7) ) ,-7) ,-7) +((((X+transpose(X,7) ) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-7) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) |(transpose(shuffle(transpose(X,-7) ) ,4) +transpose((((X+transpose(X,7) ) |(step(X,12) +(X+transpose(X,7) ) ) ) +(X|transpose(X,4) ) ) ,7) ) ) ) ) ,-7) +transpose(step(arpeggio(transpose((arpeggio((((transpose(X,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) +(transpose(X,-5) |X) ) +(transpose((X+X) ,-7) |(X+transpose(X,12) ) ) ) ) +transpose((((transpose(X,-5) +echo(X,4,6) ) |X) |(((X+transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(X,4) ,12) ) ) ,7) ) ,-5) ) ,12) ,4) ) +transpose(((arpeggio((((X+transpose((X|X) ,12) ) +transpose((X+transpose(X,7) ) ,-5) ) +transpose(X,-5) ) ) +transpose(((transpose(transpose(transpose(transpose((X+X) ,4) ,-7) ,4) ,-5) +((echo(X,4,6) |transpose((transpose(X,-5) +(X+transpose(X,12) ) ) ,-5) ) +transpose(((arpeggio((X|X) ) |arpeggio(X) ) +transpose(step(X,12) ,7) ) ,12) ) ) +(transpose((((X+X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4) +transpose((shuffle(step(arpeggio(X) ,12) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ,7) ) ) ,7) ) +transpose(step(transpose(step(arpeggio((X+X) ) ,12) ,-7) ,12) ,12) ) ,7) ) ,12) ) ) ) ) ) ,7) )
random seed used was 219137283

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