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(((echo(step((transpose(((arpeggio(shuffle((transpose(X,4) +transpose(transpose(X,4) ,12) ) ) ) +(arpeggio(transpose((transpose((transpose(X,-5) +transpose(X,-5) ) ,4) |(X+arpeggio(X) ) ) ,-5) ) |echo(((X|X) +transpose(transpose(X,4) ,7) ) ,4,6) ) ) |(echo(transpose((echo(echo(X,4,6) ,4,6) +(echo(transpose(X,-7) ,4,6) +transpose(((X+transpose(X,7) ) +(X+X) ) ,7) ) ) ,-5) ,4,6) +step((transpose((transpose(transpose(X,4) ,-5) +((X+transpose(X,7) ) +X) ) ,4) |shuffle((transpose(echo((X+X) ,4,6) ,4) +transpose((transpose(X,-5) +transpose(X,12) ) ,12) ) ) ) ,12) ) ) ,4) |transpose((step(transpose((step(shuffle(X) ,12) +transpose((step(X,12) |echo(X,4,6) ) ,12) ) ,-7) ,12) |transpose(transpose(transpose(transpose(X,-7) ,-7) ,-5) ,-7) ) ,4) ) ,12) ,4,6) +transpose(((echo(echo((((transpose((shuffle((X+X) ) +(arpeggio(X) +step(X,12) ) ) ,-7) +transpose(step(transpose(transpose(X,-5) ,4) ,12) ,4) ) +transpose(shuffle(step(transpose(X,-5) ,12) ) ,4) ) +transpose(((step(shuffle((transpose((transpose(X,4) +transpose(X,7) ) ,-7) +(arpeggio(transpose(X,-7) ) +transpose(shuffle(shuffle(X) ) ,7) ) ) ) ,12) +transpose(shuffle((transpose((X+transpose(X,7) ) ,-7) +transpose(arpeggio((X+X) ) ,12) ) ) ,12) ) |(((((transpose(X,-7) +(X|X) ) |transpose(step(echo(X,4,6) ,12) ,4) ) +transpose(shuffle((((X+transpose(transpose(X,-7) ,7) ) +transpose(X,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ) ,4) ) +transpose((arpeggio(arpeggio(X) ) |transpose(X,-5) ) ,7) ) +transpose(transpose(transpose(((transpose(X,4) +transpose(X,12) ) |shuffle(echo(X,4,6) ) ) ,4) ,-5) ,12) ) ) ,7) ) ,4,6) ,4,6) |shuffle((transpose(transpose((((shuffle(step(X,12) ) +(X|(((X+X) +transpose((X+X) ,7) ) +((transpose(X,-7) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ) ) +transpose((((shuffle(transpose(X,4) ) |(X+transpose(echo(X,4,6) ,7) ) ) +transpose(transpose((transpose(X,4) |(X|(X|X) ) ) ,4) ,12) ) |(arpeggio(transpose(transpose((X+X) ,-5) ,4) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-5) ,12) ) ) ,12) ) +(transpose((transpose((X+X) ,-5) +(transpose(X,-7) |(X+transpose(X,7) ) ) ) ,4) +transpose((transpose(((X+transpose(X,7) ) +((((X+X) +transpose((X|X) ,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ) ,-7) +transpose((transpose(X,4) +transpose((transpose(X,-5) |transpose((X+transpose(X,7) ) ,4) ) ,12) ) ,12) ) ,7) ) ) ,-5) ,-5) |transpose(transpose(((transpose(transpose((transpose(X,-5) +transpose(shuffle(X) ,7) ) ,4) ,-5) +transpose((((transpose(X,4) |(X+transpose(X,12) ) ) |(step((X+transpose(X,7) ) ,12) +transpose(X,4) ) ) |transpose((((X|shuffle(X) ) +transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) ,4) ) +transpose(arpeggio((shuffle((X+transpose(X,7) ) ) +transpose(X,-7) ) ) ,7) ) ,4) ,4) ) ) ) +transpose(step(((((((echo(transpose((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) ,-5) ,4,6) +transpose((X+transpose(transpose(transpose(X,-5) ,4) ,12) ) ,-5) ) +transpose(((((X+X) +transpose(transpose(X,4) ,7) ) +transpose(((X|echo(X,4,6) ) |echo(arpeggio(transpose(X,-5) ) ,4,6) ) ,4) ) +transpose(echo((transpose(X,4) +X) ,4,6) ,7) ) ,4) ) +transpose(((((transpose(transpose(X,4) ,4) +transpose(transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,-7) ,7) ) +transpose(((((X+transpose(X,12) ) +transpose((X|transpose(X,-5) ) ,4) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) +transpose(transpose((X|X) ,-7) ,7) ) ,-7) ) |(transpose(arpeggio((((X|X) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) ) ,4) +shuffle((((X|X) |echo(X,4,6) ) |step(X,12) ) ) ) ) +transpose(transpose(transpose((((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) |echo(transpose(transpose(X,-5) ,-5) ,4,6) ) +((X+transpose(X,7) ) +((X+transpose(transpose(X,-5) ,7) ) +transpose(step(X,12) ,4) ) ) ) ,-5) ,-5) ,12) ) ,7) ) +(transpose((((((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(arpeggio(shuffle(X) ) ,7) ) +(shuffle(X) +transpose((((X+transpose((X+transpose(X,7) ) ,7) ) +transpose((transpose(X,4) +transpose(X,7) ) ,4) ) +transpose((step(X,12) +transpose(arpeggio(X) ,12) ) ,7) ) ,12) ) ) +transpose((transpose(transpose(X,-7) ,4) +transpose(arpeggio(step(X,12) ) ,7) ) ,4) ) +transpose(transpose(shuffle((X+transpose(transpose(X,-7) ,7) ) ) ,-5) ,-7) ) ,-7) |echo((((((arpeggio(X) +transpose(echo(X,4,6) ,-5) ) |((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ) +transpose(X,7) ) |transpose(transpose((X+transpose(step(X,12) ,12) ) ,-7) ,4) ) +(((transpose(X,-5) |step(X,12) ) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) +shuffle((X|X) ) ) ) ,4,6) ) ) +transpose(transpose((step(echo((arpeggio(X) +(((transpose(X,-5) +transpose(X,4) ) +transpose((transpose(X,4) +transpose(X,7) ) ,4) ) +transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4,6) ,12) |(((transpose(echo((X+X) ,4,6) ,-5) +transpose(shuffle(((X+X) |X) ) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) +transpose(((arpeggio((transpose(X,-7) +step(X,12) ) ) +transpose((echo(echo(transpose(X,-7) ,4,6) ,4,6) |(((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +(X+transpose(transpose(X,4) ,12) ) ) ) ,4) ) +transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(((X+transpose(X,12) ) +transpose(X,-5) ) ,4) ) +transpose((transpose((X+X) ,-5) +transpose(echo(X,4,6) ,12) ) ,7) ) +(((X+X) +shuffle((X+X) ) ) +transpose((arpeggio(X) +transpose(transpose(X,4) ,12) ) ,7) ) ) ,7) ) ,12) ) ) ,4) ,4) ) +transpose(((echo((((X+step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose((transpose((X+transpose(X,7) ) ,-5) +X) ,7) ) ,4,6) +transpose(transpose((((((step(X,12) +transpose(transpose(X,-5) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose(echo(transpose((X+X) ,-5) ,4,6) ,7) ) +transpose((X|X) ,-5) ) ,-5) ,12) ) +(transpose((transpose(X,4) |(shuffle(arpeggio(step(X,12) ) ) +transpose(arpeggio(X) ,12) ) ) ,-7) +((transpose(transpose(X,-5) ,-7) +transpose(transpose((X|X) ,4) ,7) ) +transpose(transpose(echo((X|X) ,4,6) ,-5) ,7) ) ) ) ,7) ) ,12) ,12) ) ,4) ) +transpose((transpose((transpose(arpeggio(arpeggio(shuffle(((transpose(X,-5) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) ) ) ) ,-5) +transpose(shuffle(arpeggio(step(transpose((X+transpose(X,7) ) ,4) ,12) ) ) ,12) ) ,4) +step(transpose(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) +transpose((transpose(transpose(transpose(X,-7) ,-7) ,-7) |(arpeggio((echo(X,4,6) |((X+arpeggio(X) ) +(transpose(transpose(X,-5) ,-5) |transpose(X,-7) ) ) ) ) +transpose((arpeggio(X) +transpose((step(X,12) |(shuffle(X) |(X|X) ) ) ,7) ) ,7) ) ) ,-7) ) ,-5) ,12) ) ,7) ) ,4,6) |transpose((transpose((transpose(((step(X,12) |(step(step(X,12) ,12) +shuffle(X) ) ) +transpose(echo((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,4,6) ,-5) ) ,-5) +transpose((transpose((step(((transpose(X,-5) +X) +transpose((X|(X|X) ) ,7) ) ,12) +transpose(step(((step(echo((X+X) ,4,6) ,12) |X) +transpose((X+transpose((step(X,12) +transpose(X,4) ) ,12) ) ,12) ) ,12) ,7) ) ,-7) |transpose(echo(transpose(arpeggio(X) ,4) ,4,6) ,-5) ) ,12) ) ,-5) +transpose(transpose(shuffle(transpose(((((transpose(X,-5) |(X|((X+transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ) ) +step(((X+transpose(arpeggio(X) ,7) ) +arpeggio(transpose(X,4) ) ) ,12) ) +transpose(transpose(echo(transpose(step(X,12) ,-5) ,4,6) ,-5) ,-7) ) |(transpose(transpose((X|X) ,4) ,4) |(transpose(transpose(X,4) ,-7) +transpose((X|transpose((X+transpose(X,7) ) ,-5) ) ,-7) ) ) ) ,-5) ) ,-5) ,12) ) ,-7) ) +transpose(transpose(step(echo(transpose(step(((shuffle(echo(X,4,6) ) +echo(((transpose(echo(X,4,6) ,-7) +transpose(transpose((X|X) ,-5) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo((X|X) ,4,6) ,7) ) ,7) ) ,4,6) ) |(((arpeggio(X) +(transpose(X,-7) +arpeggio(transpose(X,-5) ) ) ) +transpose(shuffle(X) ,7) ) +transpose(((shuffle(transpose(X,4) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,-5) ,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,-5) ) ) ,12) ,-7) ,4,6) ,12) ,-7) ,-5) ) +transpose((((step((((transpose(((transpose((shuffle((X+X) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) ,-5) +((X+transpose(transpose((X+transpose((X|X) ,7) ) ,4) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) +step(transpose((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,4) ,12) ) ,-7) +transpose(transpose(shuffle(((step(X,12) |transpose(X,-5) ) +((transpose(X,4) |step(X,12) ) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ) ,-7) ,4) ) +transpose((transpose(((((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ,4) ,12) ) ,-5) +(transpose((arpeggio(transpose(arpeggio(X) ,-5) ) +step(transpose((X|X) ,-5) ,12) ) ,4) +transpose(((transpose(transpose(transpose(X,-5) ,4) ,4) +transpose(shuffle(X) ,-5) ) |((arpeggio(X) +transpose(arpeggio(X) ,12) ) +transpose(transpose(X,-7) ,-5) ) ) ,7) ) ) ,7) ) |((((arpeggio(transpose(X,4) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,-7) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose((step(X,12) +transpose(X,12) ) ,7) ) +transpose(arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((echo(X,4,6) +transpose(X,7) ) ,12) ) |((X+X) |transpose(X,4) ) ) ) ,12) ) ,4) ) +transpose(step(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,12) ,7) ) +transpose((((((X+transpose(shuffle(X) ,7) ) +transpose(echo(X,4,6) ,7) ) |((X+X) +transpose(((shuffle(X) +transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) |echo((transpose(((((X+X) +transpose(X,12) ) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose(X,7) ) ,-7) +transpose(transpose(transpose((X+transpose(transpose(X,-5) ,7) ) ,4) ,4) ,7) ) ,4,6) ) ,7) ) ) ,12) |shuffle(echo((transpose(((((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose(step(X,12) ,-5) ,4) ,12) ) |X) ,4) +transpose((step((transpose(step(transpose(transpose(X,4) ,-5) ,12) ,4) +transpose(transpose((transpose(transpose(X,-5) ,-5) +transpose(transpose(transpose((X+X) ,-7) ,-5) ,7) ) ,4) ,12) ) ,12) +transpose(((((X|(echo(transpose(X,4) ,4,6) +transpose(X,12) ) ) +(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) +transpose(((echo(X,4,6) +X) +X) ,12) ) ) +transpose(((X+echo(X,4,6) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose((shuffle(shuffle(X) ) +transpose(((X|X) +transpose(transpose(X,-7) ,7) ) ,7) ) ,7) ) ,12) ) ,-7) ) ,4,6) ) ) +step(shuffle(((transpose(((X|X) +transpose(transpose(X,-5) ,7) ) ,-7) +transpose((transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose((X+X) ,4) ,7) ) ,-5) +transpose(X,4) ) ,12) ) +transpose(arpeggio((X+(transpose(transpose(X,-7) ,-7) +transpose((transpose(X,-5) +transpose((X|X) ,7) ) ,7) ) ) ) ,12) ) ) ,12) ) +transpose(arpeggio(echo((transpose(arpeggio((shuffle(echo((transpose(transpose(X,-7) ,4) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,4,6) ) +transpose((transpose(transpose(X,-7) ,4) |echo(transpose(X,4) ,4,6) ) ,12) ) ) ,-5) +(transpose((step(transpose(arpeggio(transpose(echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) ,4) ) ,4) ,12) |transpose((transpose(arpeggio(shuffle((X+X) ) ) ,4) |transpose((echo(X,4,6) +transpose((step(transpose(step(X,12) ,-7) ,12) +transpose((X+(X+transpose(X,7) ) ) ,7) ) ,12) ) ,-5) ) ,-5) ) ,-7) +((transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,12) ) ,-7) +transpose(transpose(transpose((transpose(echo(X,4,6) ,-5) |transpose(step(X,12) ,-7) ) ,-7) ,-5) ,7) ) +((transpose((echo((X+transpose((X+X) ,7) ) ,4,6) |shuffle(echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ) ) ,-5) +transpose(shuffle((((transpose((X+X) ,4) +transpose((X+transpose(transpose(X,4) ,7) ) ,12) ) +transpose(shuffle(arpeggio(X) ) ,12) ) +transpose(((X+transpose(X,12) ) +transpose(X,-5) ) ,12) ) ) ,4) ) +transpose((((echo((X+X) ,4,6) +transpose(echo(X,4,6) ,7) ) +shuffle(transpose(X,-7) ) ) +step(transpose(transpose(X,-7) ,-5) ,12) ) ,7) ) ) ) ) ,4,6) ) ,7) ) ,7) )
random seed used was 167283874

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