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 18 generations the expression "X" became this:
((((transpose(shuffle((((transpose(shuffle(shuffle(((X+transpose(X,7) ) +X) ) ) ,-7) +transpose((transpose(transpose(step(X,12) ,4) ,-5) +transpose(transpose(((X+X) +transpose((arpeggio(X) |transpose(transpose(X,-7) ,4) ) ,7) ) ,-5) ,7) ) ,7) ) +transpose(transpose(transpose(echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) ,-7) ,4) ,-5) ) |(shuffle(echo((((transpose(shuffle(X) ,-5) +transpose(shuffle((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) ,4) ) +transpose((X+shuffle(transpose(X,4) ) ) ,7) ) +transpose(echo((echo(X,4,6) +(arpeggio(X) +transpose(X,12) ) ) ,4,6) ,7) ) ,4,6) ) +transpose((shuffle(transpose(shuffle((echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) ,4,6) +((step(X,12) +transpose(echo(X,4,6) ,7) ) |shuffle(X) ) ) ) ,-7) ) +transpose((((echo(transpose((shuffle(transpose(transpose(X,4) ,-5) ) +(shuffle(X) |(X|X) ) ) ,-7) ,4,6) |(X|shuffle(X) ) ) +transpose(transpose(arpeggio(echo((((transpose(X,4) |transpose(X,-5) ) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,4,6) ) ,-7) ,4) ) +transpose(transpose(shuffle(transpose(((shuffle((X+transpose(X,12) ) ) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose((X|X) ,7) ) ,-5) ) ,-5) ,7) ) ,7) ) ,12) ) ) ) ,4) +transpose(((transpose(((shuffle(shuffle(arpeggio(shuffle((X+transpose(X,7) ) ) ) ) ) +transpose(transpose((shuffle(shuffle(X) ) +transpose(((X+transpose(X,7) ) +X) ,12) ) ,4) ,4) ) +transpose(shuffle(((((shuffle(transpose(X,4) ) +transpose(((transpose(X,-5) |transpose(X,-5) ) |transpose(X,4) ) ,4) ) +transpose((X+X) ,7) ) |((((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +transpose(((X|transpose(X,-5) ) |(X|X) ) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ) +transpose((transpose(X,4) |transpose(X,4) ) ,12) ) ) ,7) ) ,4) +transpose(((((shuffle(transpose(X,-7) ) +transpose((X+shuffle(X) ) ,7) ) +transpose(step(transpose(arpeggio(transpose((X+transpose(X,12) ) ,-7) ) ,-5) ,12) ,12) ) +transpose((((((transpose(transpose(X,4) ,-7) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,7) ) +transpose(shuffle(transpose((shuffle(X) +transpose(X,12) ) ,4) ) ,7) ) |((transpose((X|X) ,-7) +(X+X) ) +transpose(transpose((transpose(X,4) |echo(X,4,6) ) ,-5) ,12) ) ) +transpose((shuffle(transpose(X,4) ) |(((X+transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) +(((X+X) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) ) ) ,12) ) ,12) ) +arpeggio(transpose(transpose(shuffle(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |(step(X,12) |X) ) ) ,4) ,-7) ) ) ,12) ) +transpose(((((step(transpose(transpose(X,4) ,-7) ,12) +step(((transpose(arpeggio((arpeggio(X) +transpose(X,4) ) ) ,-7) +transpose((transpose(transpose(((X|X) +transpose(X,12) ) ,-5) ,-7) +transpose((transpose(((X+X) |(X+transpose(X,12) ) ) ,4) |shuffle(X) ) ,7) ) ,4) ) +transpose((((echo(X,4,6) |transpose((X|X) ,-7) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,12) ) ) |step(shuffle(X) ,12) ) ,7) ) ,12) ) +transpose(step(arpeggio(step(transpose(X,-7) ,12) ) ,12) ,12) ) +transpose(shuffle(((shuffle((transpose((X+transpose(X,7) ) ,4) +(X|X) ) ) |transpose(transpose(transpose(echo(X,4,6) ,-5) ,-7) ,-5) ) +transpose(step(transpose(shuffle(transpose(X,4) ) ,-5) ,12) ,12) ) ) ,4) ) +transpose(((transpose((echo(shuffle((X+transpose(step(transpose(X,4) ,12) ,7) ) ) ,4,6) +((X|X) +transpose((step(X,12) +((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ) ,4) +transpose((transpose(shuffle(((X+transpose(transpose(X,4) ,7) ) +transpose(((X|X) +shuffle(X) ) ,12) ) ) ,4) |transpose((echo((shuffle(X) +((X+transpose(transpose(X,-5) ,4) ) +transpose(shuffle(X) ,7) ) ) ,4,6) +transpose(transpose(((((X+X) |(X|X) ) +transpose(shuffle(X) ,4) ) +transpose((X+shuffle(X) ) ,7) ) ,-5) ,7) ) ,-7) ) ,12) ) |echo((shuffle(transpose(X,4) ) |transpose(transpose(X,-7) ,4) ) ,4,6) ) ,7) ) ,12) ) ,4) ) +transpose(((transpose((((shuffle(shuffle((X+X) ) ) +transpose((transpose(arpeggio((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) ,4) |transpose(X,4) ) ,12) ) +transpose(step((((((X+transpose(X,4) ) +transpose(X,7) ) |(X|(X+X) ) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) ,4) ,7) ) |(step(X,12) +step((X|X) ,12) ) ) ,12) ,4) ) +transpose(((transpose(shuffle((X+X) ) ,-5) +(arpeggio(X) |transpose(step(X,12) ,4) ) ) |(((step(echo((X|X) ,4,6) ,12) +transpose((shuffle(shuffle(X) ) +transpose((X+transpose(X,12) ) ,-5) ) ,4) ) +transpose(transpose(((X+transpose(X,12) ) |X) ,-7) ,7) ) +transpose(shuffle(arpeggio(((echo(X,4,6) +transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ) ) ,7) ) ) ,7) ) ,-7) +shuffle(transpose(transpose(transpose(transpose((X+X) ,4) ,-5) ,-7) ,-5) ) ) +(shuffle((shuffle((X+X) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ) +transpose(shuffle(transpose(echo(echo(step(X,12) ,4,6) ,4,6) ,-5) ) ,7) ) ) ,7) ) +transpose(((transpose((((transpose(((transpose(X,-5) +X) +transpose(transpose(X,-7) ,7) ) ,4) |step(((X|X) |X) ,12) ) |transpose(transpose(echo(transpose(X,-5) ,4,6) ,4) ,-7) ) +transpose(((transpose(((X+transpose(X,12) ) +shuffle(X) ) ,4) |(transpose(shuffle((X|X) ) ,4) |transpose(transpose(X,-5) ,4) ) ) +transpose(((transpose(step(transpose(X,-5) ,12) ,-7) +transpose((shuffle(transpose(X,4) ) |transpose(shuffle(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) ) ,12) ) +transpose(step(((((X+transpose((X+X) ,4) ) +transpose(X,7) ) +transpose(echo((X+X) ,4,6) ,7) ) +(arpeggio(X) |transpose(X,4) ) ) ,12) ,12) ) ,7) ) ,12) ) ,-7) +transpose(transpose(transpose(step(echo(transpose(((X|X) +arpeggio(((X+transpose(X,12) ) +(X|(X|X) ) ) ) ) ,-5) ,4,6) ,12) ,-5) ,-5) ,4) ) +transpose(shuffle(arpeggio(((transpose(shuffle(transpose(transpose(((((X+transpose(X,12) ) +X) +shuffle(transpose((X|X) ,4) ) ) +transpose(((transpose(X,4) |step(transpose(X,-5) ,12) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,7) ) ,-5) ,-5) ) ,4) +transpose(((transpose(shuffle(((((((X+transpose(X,7) ) +transpose(X,12) ) |transpose(transpose(X,4) ,-5) ) +arpeggio(transpose(X,4) ) ) +transpose(transpose((step(X,12) +transpose(arpeggio(X) ,7) ) ,-7) ,-5) ) |(((transpose(((X+transpose(X,7) ) +X) ,-5) +transpose(echo((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,4,6) ,12) ) +transpose((((transpose((X|X) ,4) +transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ,4) ) +transpose(((transpose(shuffle((X+X) ) ,-7) +transpose(transpose(X,-7) ,12) ) |transpose((shuffle(transpose(X,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X|X) ) ,12) ) ,4) ) ,7) ) ) ) ,-7) +transpose((arpeggio(arpeggio(((transpose(transpose(transpose(X,4) ,4) ,4) +transpose((arpeggio(transpose(X,-5) ) |((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose((shuffle((X+transpose(step(X,12) ,12) ) ) +transpose(shuffle(shuffle(shuffle((X+transpose(X,12) ) ) ) ) ,12) ) ,7) ) ) ) +transpose((((transpose(((shuffle(X) +transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ,4) +transpose(((X+transpose(step((X+transpose((X|X) ,7) ) ,12) ,4) ) +transpose((((X|X) +transpose(shuffle(X) ,4) ) +transpose((shuffle(X) +X) ,7) ) ,7) ) ,12) ) +transpose(shuffle(step((echo((X+transpose(X,7) ) ,4,6) |(shuffle((X+transpose(X,12) ) ) |step(transpose(X,4) ,12) ) ) ,12) ) ,4) ) +transpose(step((transpose((((X+X) +transpose(arpeggio(X) ,7) ) +transpose(X,12) ) ,4) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,12) ,7) ) ,7) ) ,4) ) +transpose(((transpose((transpose((((X+transpose(shuffle(X) ,12) ) |transpose(transpose((X+X) ,-5) ,4) ) +transpose(step(shuffle(X) ,12) ,12) ) ,-5) +transpose((shuffle((X+transpose(transpose(shuffle(X) ,4) ,12) ) ) |shuffle(X) ) ,7) ) ,4) +transpose(transpose(transpose((shuffle(step(X,12) ) |shuffle(X) ) ,-5) ,-7) ,4) ) +transpose(((transpose(((echo(((X|X) |transpose(X,4) ) ,4,6) +transpose(step((X+transpose(shuffle(X) ,7) ) ,12) ,12) ) +(X|arpeggio(X) ) ) ,-5) +transpose(shuffle((transpose(transpose(X,-5) ,4) |(X+X) ) ) ,-5) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +shuffle((X+transpose(transpose(arpeggio(X) ,4) ,7) ) ) ) ,4) ) ,7) ) ,7) ) ,4) ) +transpose(((transpose((arpeggio((shuffle(transpose(X,4) ) +transpose(transpose(X,4) ,12) ) ) +transpose(((transpose(transpose(X,4) ,4) |transpose(X,-7) ) |shuffle(((arpeggio(X) +transpose((X|X) ,4) ) +transpose(X,7) ) ) ) ,12) ) ,-5) |(step((((X|X) |shuffle(X) ) +transpose(((X+transpose(shuffle(X) ,7) ) +((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) ,12) +(transpose((((X+X) +transpose(X,7) ) +transpose((X|transpose(X,-7) ) ,7) ) ,-7) +transpose(transpose(X,-5) ,7) ) ) ) |((((transpose(transpose(X,-7) ,-5) +transpose(echo(((((X+X) +transpose(shuffle(X) ,7) ) +transpose(X,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,4,6) ,12) ) +transpose(transpose((shuffle(echo(X,4,6) ) +transpose(transpose((X|X) ,4) ,12) ) ,4) ,4) ) +transpose(transpose(X,-7) ,7) ) +(((transpose(transpose(X,-5) ,4) +transpose(shuffle(echo(X,4,6) ) ,12) ) +transpose((echo(X,4,6) |((X|X) +(X+X) ) ) ,4) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) ) ) ,7) ) ) ) ,7) ) ,7) ) |transpose((echo((((shuffle(((((echo((X+X) ,4,6) +transpose(transpose((X+X) ,4) ,7) ) +((((X+transpose(X,12) ) +(X|X) ) +transpose(shuffle(X) ,12) ) +transpose(transpose(X,-7) ,12) ) ) |transpose((((echo(((X+X) |(X+X) ) ,4,6) +transpose(transpose((((step(X,12) |transpose(X,-7) ) +transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,4) ,7) ) +transpose((((echo((transpose(X,4) |shuffle(X) ) ,4,6) +transpose(((transpose(X,4) |shuffle(X) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(step(X,12) ) ,7) ) |transpose(((transpose(X,4) +transpose((X+X) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose((arpeggio(X) +transpose(transpose(X,4) ,7) ) ,12) ) ,7) ) ,-7) ) +transpose(transpose(transpose(transpose(transpose((X|X) ,-5) ,-5) ,4) ,-7) ,12) ) ) +transpose(((arpeggio(transpose((X|(X+transpose(X,7) ) ) ,4) ) +transpose(echo(((((transpose((X|X) ,-7) +transpose(((X+X) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) +shuffle(step(X,12) ) ) +transpose(transpose(X,4) ,4) ) ,4,6) ,4) ) +transpose((arpeggio((X|X) ) +echo(shuffle(step((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) |(X|arpeggio(X) ) ) +transpose(transpose((X+X) ,4) ,12) ) ,12) ) ,4,6) ) ,12) ) ,12) ) +transpose(arpeggio(((X+X) |echo(X,4,6) ) ) ,-5) ) +transpose((transpose((transpose(transpose((transpose((X|X) ,4) +transpose((((shuffle(X) |transpose(X,-7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,4) ,-5) +((transpose(transpose(transpose(X,4) ,-7) ,-5) |(transpose(((((X|X) +transpose((echo(X,4,6) +X) ,4) ) +transpose((X+transpose((X+X) ,12) ) ,7) ) +transpose((echo(X,4,6) +arpeggio(X) ) ,12) ) ,4) +transpose(((((X|X) +transpose(transpose(X,4) ,12) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,-7) ) ,12) ) ) +transpose(echo((transpose(X,-5) +transpose(X,4) ) ,4,6) ,12) ) ) ,4) |transpose(arpeggio(echo((((X+X) |transpose(shuffle(X) ,4) ) |echo(X,4,6) ) ,4,6) ) ,4) ) ,7) ) ,4,6) |step(transpose(((((transpose(X,4) +transpose(transpose(shuffle((X|X) ) ,4) ,7) ) +transpose(((shuffle(transpose(X,-7) ) +transpose((transpose(echo(X,4,6) ,-7) |transpose(transpose(X,-7) ,4) ) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,7) ) +transpose(((((X|(X+transpose(X,12) ) ) +transpose(((X+X) |X) ,7) ) +(X+transpose((transpose(X,-5) +transpose((X+X) ,7) ) ,4) ) ) |(((transpose(X,4) +(transpose(X,4) +X) ) |(X|X) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ) ) ,7) ) +(((shuffle((arpeggio(X) +X) ) |arpeggio(transpose((X+transpose(X,7) ) ,4) ) ) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(step(X,12) ,7) ) ) ,4) ,12) ) ,4) )
random seed used was 155704074

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