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

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