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:
arpeggio((((transpose(transpose(transpose(((transpose(transpose(shuffle(((X+transpose(X,-7) ) +(((X+X) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) ,4) ,-5) +transpose((echo((transpose(transpose((arpeggio(X) |(X|X) ) ,-7) ,-5) +step((transpose(transpose(X,-7) ,-7) +transpose((echo(X,4,6) |transpose(X,-7) ) ,-5) ) ,12) ) ,4,6) +transpose(((((shuffle(step((step(transpose(X,-5) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,12) ) +(transpose(step(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) ,12) ,-5) |((shuffle(transpose(X,-7) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) |transpose(arpeggio(transpose(X,4) ) ,-7) ) ) ) +transpose(transpose((transpose((arpeggio(X) +transpose(((X+transpose(transpose(X,-7) ,12) ) |shuffle(transpose(X,-7) ) ) ,7) ) ,4) +transpose(transpose((X+transpose(X,12) ) ,4) ,-5) ) ,-5) ,4) ) +transpose(echo(((transpose((arpeggio(X) +transpose(X,12) ) ,4) +transpose((arpeggio((X|X) ) |transpose(transpose((X+X) ,-5) ,-5) ) ,4) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +((X+X) +transpose(step(X,12) ,7) ) ) ,-5) ,7) ) ,4,6) ,7) ) +transpose((shuffle(transpose(transpose(transpose(shuffle(X) ,-5) ,-5) ,-5) ) |echo((((transpose(X,4) |(X+transpose(X,7) ) ) +transpose((transpose(X,4) |transpose(X,-5) ) ,7) ) +(X|X) ) ,4,6) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(step((((transpose((transpose((X+step(X,12) ) ,-5) +transpose(transpose(transpose((X|X) ,-5) ,-7) ,12) ) ,-7) +transpose(step(X,12) ,12) ) +transpose(transpose(((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) +transpose((step(X,12) +transpose(X,12) ) ,4) ) ,-5) ,7) ) |transpose(echo((transpose(arpeggio(((X+transpose(X,7) ) |X) ) ,4) +transpose((X|X) ,7) ) ,4,6) ,4) ) ,12) ,-7) ,7) ) ,-5) ,-7) ,-7) +((((((((arpeggio(arpeggio((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) ) ) +transpose(((X|(X|X) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,4) ) +transpose(transpose(((((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) +transpose(step(X,12) ,4) ) +transpose((X+transpose((transpose(X,4) +transpose(X,7) ) ,7) ) ,7) ) ,-5) ,7) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(step(transpose(arpeggio((X+transpose(X,12) ) ) ,4) ,12) ,7) ) +transpose(echo((transpose(transpose(step(X,12) ,-7) ,-7) |((X+X) +shuffle(transpose(X,-5) ) ) ) ,4,6) ,4) ) +transpose(echo(transpose((transpose((arpeggio(((transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(((X+transpose(X,7) ) |X) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose((transpose(transpose(X,4) ,4) +transpose(step(transpose((X+transpose(X,12) ) ,-7) ,12) ,7) ) ,12) ) ,-5) +(transpose(transpose((echo(X,4,6) |((X+transpose(X,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ) ,-5) ,4) +transpose(echo((X+(X|(X+transpose((X+X) ,12) ) ) ) ,4,6) ,7) ) ) ,-7) ,4,6) ,7) ) +transpose(arpeggio(arpeggio(transpose((((((((transpose(X,-7) |echo(X,4,6) ) +transpose((((((X+X) +transpose(X,7) ) +transpose((shuffle(X) +transpose(X,4) ) ,7) ) +transpose((transpose(X,4) +X) ,4) ) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,4) ,7) ) ,12) ) |transpose((transpose((X+transpose(X,7) ) ,4) +transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,12) ) ,4) ) +transpose((echo(transpose(X,-5) ,4,6) +transpose((X|step(X,12) ) ,12) ) ,4) ) +shuffle(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ) +transpose(shuffle(transpose(transpose(echo(step((X+X) ,12) ,4,6) ,-7) ,4) ) ,7) ) +transpose(transpose(step(((transpose(transpose(X,-5) ,-7) +transpose(X,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,12) ,4) ,12) ) ,-5) ) ) ,12) ) |(step(transpose(((shuffle((transpose(transpose(transpose(X,4) ,4) ,-5) +transpose(arpeggio((((shuffle(X) +transpose(shuffle(transpose(X,-5) ) ,12) ) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(shuffle(step(X,12) ) ,7) ) ) ,12) ) ) +echo(((transpose(echo((((transpose(X,-5) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +(X+transpose(X,12) ) ) ,4,6) ,-5) +transpose(transpose(transpose(arpeggio(X) ,-7) ,4) ,4) ) +transpose(echo(transpose(transpose((X|transpose((X+transpose(X,12) ) ,-5) ) ,-5) ,4) ,4,6) ,7) ) ,4,6) ) +shuffle(shuffle(((echo(X,4,6) +transpose(((X+X) |X) ,4) ) +transpose(step(X,12) ,7) ) ) ) ) ,4) ,12) |transpose((((arpeggio(step((((((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) +transpose(echo(X,4,6) ,12) ) ,12) ) +((echo(echo(((X+transpose(X,12) ) +(X+X) ) ,4,6) ,4,6) +transpose(((transpose((X+transpose((X|X) ,12) ) ,-5) |(step(X,12) +transpose(X,7) ) ) +transpose((((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose((X+(X|X) ) ,7) ) +arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) ,4) ) +transpose((transpose((((X+X) +X) +transpose(transpose(X,-5) ,12) ) ,4) +transpose((transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(X,4) ) ,7) ) ,7) ) ) +transpose(((transpose(((X|X) |arpeggio(X) ) ,-5) +(transpose(X,-5) |X) ) +step(step(step((X|X) ,12) ,12) ,12) ) ,4) ) +transpose(transpose((transpose(((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) +transpose(transpose(((X+transpose(X,7) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,-7) ,7) ) ,4) ,7) ) ,-5) ) ) ) +transpose(transpose(((step(((((arpeggio((transpose(echo(arpeggio(X) ,4,6) ,-5) +(((transpose(X,4) +transpose((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ,4) ) +transpose(X,7) ) |(shuffle(transpose(X,-5) ) |(X|echo(X,4,6) ) ) ) ) ) |echo(((shuffle(echo(X,4,6) ) +transpose(((transpose(X,-5) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) ) +transpose((arpeggio(step(arpeggio(echo(X,4,6) ) ,12) ) +transpose(transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(shuffle(X) ,12) ) ,-7) ,7) ) ,4) ) +transpose(((transpose(((echo((X|X) ,4,6) |step((X+transpose(X,7) ) ,12) ) +transpose((transpose(shuffle(X) ,-5) |echo(step((X+X) ,12) ,4,6) ) ,7) ) ,-7) +transpose((((shuffle(step((X|echo(X,4,6) ) ,12) ) +transpose((((X|X) +step(X,12) ) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) ) +transpose(((transpose((X|X) ,-5) |echo((X+X) ,4,6) ) +((((X|X) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) |shuffle(X) ) ) ,7) ) |(((step(X,12) |arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) |(transpose(arpeggio(transpose(X,-5) ) ,4) |transpose(transpose(X,-7) ,4) ) ) +transpose(((X+transpose((X+transpose(X,4) ) ,4) ) +transpose((X+X) ,7) ) ,7) ) ) ,4) ) +transpose((((((transpose(((X+X) +transpose(X,12) ) ,4) |arpeggio(transpose(X,4) ) ) +echo((X|((X+transpose(X,12) ) +X) ) ,4,6) ) +transpose((((echo(X,4,6) +transpose(step(transpose(X,-7) ,12) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,7) ) |((transpose(X,-7) +arpeggio(X) ) +echo((X|X) ,4,6) ) ) ,4) ) +transpose(((((X+transpose(X,7) ) +transpose(X,7) ) |step((transpose(X,-7) |X) ,12) ) |step((transpose(X,-7) +transpose((step(X,12) |echo(X,4,6) ) ,7) ) ,12) ) ,7) ) |(transpose((transpose((X|X) ,4) +(shuffle(X) +transpose(transpose(X,-5) ,12) ) ) ,4) |(((((X+transpose(X,7) ) +transpose(X,7) ) +((X+transpose(X,7) ) +X) ) +transpose((X+transpose(step(X,12) ,12) ) ,4) ) +transpose((((X+X) +(X+transpose(transpose(X,-7) ,7) ) ) |((X+transpose(X,12) ) |X) ) ,7) ) ) ) ,7) ) ,7) ) +step(((((X+transpose(X,7) ) |(step(X,12) +transpose(X,7) ) ) +transpose(transpose(arpeggio((arpeggio(X) +(X+transpose(X,7) ) ) ) ,4) ,-5) ) |(transpose(((transpose(arpeggio(X) ,4) +transpose(((X+X) +(transpose(transpose(X,4) ,-7) |transpose(X,-5) ) ) ,4) ) +transpose((shuffle(transpose((X+transpose(X,12) ) ,-5) ) |step(transpose(X,-5) ,12) ) ,7) ) ,-5) +transpose(echo(transpose(transpose(transpose(transpose(X,4) ,4) ,4) ,-5) ,4,6) ,12) ) ) ,12) ) ,12) +transpose(echo((transpose(step((((transpose(transpose(X,4) ,-5) +transpose(transpose((echo(X,4,6) |transpose(X,-5) ) ,-5) ,12) ) |(X+transpose((transpose(transpose(X,-7) ,-5) |transpose((X+transpose(X,7) ) ,4) ) ,7) ) ) +transpose(transpose(step((transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) +((((X|X) +(X|X) ) +transpose(shuffle(X) ,7) ) |step(((X+transpose(X,12) ) +transpose(X,12) ) ,12) ) ) ,12) ,4) ,12) ) ,12) ,4) |arpeggio(transpose(step(((shuffle((arpeggio(transpose(X,-7) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ) +transpose(transpose((arpeggio((transpose((X+transpose(X,12) ) ,4) +transpose(transpose(echo(X,4,6) ,-5) ,12) ) ) +transpose(((X+X) |transpose(shuffle(X) ,-5) ) ,-7) ) ,4) ,4) ) +transpose(step(transpose(((X+X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,12) ,7) ) ,12) ,-7) ) ) ,4,6) ,12) ) |transpose(((transpose(shuffle((transpose(((transpose(((X|X) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,-7) +(((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) ) +transpose(transpose((transpose(X,-5) |X) ,-5) ,12) ) ,-7) |transpose(((transpose((transpose(X,-7) +transpose(X,4) ) ,-7) |transpose(transpose(echo(transpose(X,-7) ,4,6) ,-5) ,4) ) +arpeggio((((arpeggio(step(X,12) ) |(transpose(X,-5) +X) ) +arpeggio((transpose(X,-7) +shuffle(X) ) ) ) +transpose(echo(X,4,6) ,12) ) ) ) ,-7) ) ) ,-7) +transpose(transpose(((transpose((transpose(arpeggio(((X+transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ) ,4) |transpose(transpose(step(transpose(transpose(X,-7) ,-5) ,12) ,-7) ,-7) ) ,-5) +transpose(echo(step(transpose(transpose((X|step(X,12) ) ,-5) ,-7) ,12) ,4,6) ,7) ) +transpose(arpeggio(((transpose((((X+X) |X) +transpose(X,7) ) ,4) +echo(transpose(transpose(echo(X,4,6) ,-7) ,4) ,4,6) ) +transpose(arpeggio(((X+transpose(X,12) ) +transpose((X|X) ,12) ) ) ,7) ) ) ,12) ) ,4) ,4) ) +transpose((step(arpeggio(((X|X) +transpose(transpose(X,-7) ,7) ) ) ,12) +step((arpeggio((step((X|transpose(X,-7) ) ,12) +(X+arpeggio((X+transpose(X,7) ) ) ) ) ) +transpose((((transpose(echo(shuffle((X+X) ) ,4,6) ,-7) +transpose(transpose((X+X) ,4) ,7) ) +transpose(arpeggio(step((transpose(transpose(X,-5) ,-7) +transpose(step(X,12) ,12) ) ,12) ) ,4) ) +transpose(arpeggio((transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) ,-5) +transpose((X+X) ,4) ) ) ,7) ) ,12) ) ,12) ) ,7) ) ,-7) ) ,4) ,4) ) +transpose(transpose((transpose((((((transpose(transpose(X,-7) ,4) +transpose(shuffle((X+transpose((X+transpose(X,12) ) ,12) ) ) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) ) +transpose(transpose(X,-5) ,4) ) +transpose(shuffle((((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) +transpose((X+transpose(X,-5) ) ,4) ) +transpose(((transpose(X,-5) +transpose(transpose(arpeggio(X) ,4) ,12) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,12) ) ) ,4) ) +transpose((transpose(transpose(arpeggio(X) ,-5) ,-5) +transpose(arpeggio(transpose((transpose(transpose((X+X) ,4) ,4) +transpose(transpose(X,-7) ,7) ) ,4) ) ,7) ) ,7) ) ,4) |(step(arpeggio(transpose(shuffle((arpeggio((X|(X+X) ) ) +transpose(arpeggio(X) ,4) ) ) ,4) ) ,12) |((echo(transpose((transpose(step(arpeggio(arpeggio(X) ) ,12) ,-7) +transpose(step(transpose(step(transpose(step(X,12) ,-7) ,12) ,-5) ,12) ,12) ) ,4) ,4,6) +transpose((transpose(transpose(transpose((X|X) ,-7) ,-5) ,-5) +transpose(transpose((((X+transpose(X,7) ) |transpose((X+transpose(X,7) ) ,4) ) +(transpose((X|X) ,-5) +transpose(arpeggio(X) ,7) ) ) ,-7) ,4) ) ,12) ) +transpose(transpose((((((echo(X,4,6) +transpose(transpose(X,-7) ,7) ) +transpose(((X+transpose(X,12) ) |transpose(shuffle(X) ,-7) ) ,4) ) +transpose((arpeggio(X) +transpose(transpose(X,4) ,12) ) ,7) ) +transpose(step(((transpose((X+X) ,-5) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(X,7) ) ,12) ,12) ) |((shuffle(arpeggio(X) ) |transpose(arpeggio(transpose(X,4) ) ,4) ) |(step(transpose(transpose(X,-5) ,-5) ,12) |arpeggio((X|((transpose(X,-7) +transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ) ) ) ) ,-5) ,-5) ) ) ) ,-7) ,7) ) )
random seed used was 240801969

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