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(arpeggio(((((arpeggio(transpose(step((transpose(transpose(echo(arpeggio(echo(echo((((X+transpose(X,12) ) +X) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ,4,6) ,4,6) ) ,4,6) ,-5) ,-7) +transpose((((shuffle((X+transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) ) +transpose(shuffle((transpose(arpeggio(X) ,-7) |(((step(X,12) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,7) ) ) ) ,7) ) |shuffle((arpeggio(arpeggio(step(X,12) ) ) +transpose(((arpeggio(step(shuffle(step(arpeggio(X) ,12) ) ,12) ) +transpose(shuffle(shuffle(arpeggio(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ) ) ) ,4) ) +transpose(transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,7) ) ,12) ) ) ) +transpose((((step((X+transpose((shuffle((X+transpose(X,7) ) ) +((X+X) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) ) ,12) ) ,12) +transpose(echo(arpeggio((echo((X+transpose(X,12) ) ,4,6) +transpose((((X+transpose(X,7) ) |((X+transpose(X,12) ) +transpose(X,7) ) ) +transpose(shuffle(X) ,7) ) ,12) ) ) ,4,6) ,7) ) +transpose(step(transpose(shuffle((X+transpose(X,12) ) ) ,-7) ,12) ,4) ) +transpose((echo(transpose(arpeggio((X+X) ) ,-7) ,4,6) +((arpeggio(((X+transpose(X,4) ) +transpose((arpeggio(X) +X) ,7) ) ) +transpose((step(((X+transpose(arpeggio((X+X) ) ,4) ) +transpose(X,7) ) ,12) +((arpeggio(arpeggio(X) ) +transpose(X,4) ) +transpose(((X+X) +transpose(X,12) ) ,7) ) ) ,4) ) +transpose((transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,-5) +transpose(shuffle((arpeggio(X) +(X+transpose(X,7) ) ) ) ,7) ) ,7) ) ) ,7) ) ,7) ) ,7) ) ,12) ,-7) ) +transpose((((transpose(step((step((((X+transpose(X,12) ) +X) +transpose(X,7) ) ,12) +transpose(transpose((transpose((step(X,12) +transpose(transpose(X,4) ,7) ) ,4) |echo(((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ) ,-7) ,12) ) ,12) ,4) +echo(transpose(arpeggio((((step(X,12) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(step(X,12) ,7) ) ) ,4) ,4,6) ) +transpose((transpose(shuffle(step(((((X+transpose(echo(X,4,6) ,7) ) |X) +transpose(transpose(X,4) ,7) ) |shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ) ) ,12) ) ,-7) |transpose(shuffle(echo(transpose(step((echo(transpose((X+transpose(X,12) ) ,4) ,4,6) +transpose(arpeggio(X) ,7) ) ,12) ,4) ,4,6) ) ,4) ) ,12) ) +transpose(echo(transpose((echo(((((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(step(echo(X,4,6) ,12) ,7) ) +transpose(((X|X) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) ,7) ) ,4,6) +transpose(((echo(step((X+X) ,12) ,4,6) +transpose(((transpose(((X+X) +transpose(step(X,12) ,7) ) ,-7) +transpose(((X+step(X,12) ) +X) ,12) ) |(X+transpose(((echo(X,4,6) |arpeggio(X) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,7) ) ,7) ) ) ,4) ) +transpose((((shuffle(X) +transpose((X+transpose(shuffle(transpose((X+transpose(X,12) ) ,-7) ) ,7) ) ,7) ) +transpose(echo(arpeggio(arpeggio(arpeggio(X) ) ) ,4,6) ,4) ) +transpose(((arpeggio(X) +transpose((step(X,12) +transpose(X,12) ) ,7) ) +((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) |echo(X,4,6) ) +transpose((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,7) ) ) ,7) ) ,7) ) ,12) ) ,-7) ,4,6) ,7) ) ,4) ) +transpose(((arpeggio(transpose((arpeggio(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) +shuffle((echo(((arpeggio((X+transpose(X,12) ) ) +transpose(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) |arpeggio(transpose(((arpeggio(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-7) ) ) ) ) ,4) ) |(transpose(transpose(echo((((X+transpose(X,7) ) +transpose(transpose(shuffle(X) ,-5) ,12) ) +transpose(((transpose(transpose(X,-7) ,-7) +transpose((X+((X+transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,4) ) +transpose(transpose(((step(X,12) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4) ,7) ) ,12) ) ,4,6) ,-7) ,-7) +transpose(transpose(((transpose((((((((echo(transpose(shuffle(step(X,12) ) ,-5) ,4,6) +transpose((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) +transpose(transpose((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ,-7) ,4) ) +transpose(step(step(transpose(X,-7) ,12) ,12) ,7) ) +transpose(((echo(X,4,6) |transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,-7) ) +transpose((transpose(X,-7) +transpose(transpose(step(X,12) ,4) ,12) ) ,12) ) ,4) ) +transpose((transpose((transpose(X,-7) +(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose(shuffle(transpose(step(arpeggio(X) ,12) ,-7) ) ,12) ) ,7) ) +transpose((arpeggio((arpeggio((step(X,12) +transpose(X,7) ) ) +transpose((echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(transpose((X|X) ,-7) ,12) ) ,7) ) ,7) ) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(step(X,12) ,12) ) ,12) ) ,7) ) ,-7) +transpose((arpeggio(transpose(arpeggio(shuffle(arpeggio(X) ) ) ,-5) ) |transpose(((((((transpose((X+transpose(X,12) ) ,-7) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,4) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) +transpose(((transpose(X,-5) |X) +transpose(((transpose((X+X) ,-5) +transpose(X,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) ,12) ) ,4) ) +transpose(transpose(transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,-7) ,-7) ,7) ) +transpose(shuffle((step(shuffle(transpose(X,-7) ) ,12) +transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,12) ) ) ,4) ) +transpose((step(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,12) +transpose(transpose(echo(shuffle(X) ,4,6) ,-5) ,12) ) ,7) ) ,4) ) ,4) ) +transpose(transpose((transpose((X|(X+transpose(X,7) ) ) ,-7) +transpose(transpose(step((arpeggio(shuffle(X) ) +transpose(step((X+transpose(X,12) ) ,12) ,12) ) ,12) ,-7) ,12) ) ,-7) ,7) ) ,-7) ,12) ) ) +transpose(step(echo(transpose(transpose(transpose(((step((X|X) ,12) +transpose(step(X,12) ,-7) ) +transpose((X|step((X+transpose(X,7) ) ,12) ) ,12) ) ,4) ,-7) ,-7) ,4,6) ,12) ,7) ) ,7) ) +transpose(((transpose(shuffle(((echo((transpose(shuffle(shuffle(X) ) ,4) +transpose((step((X+transpose(X,12) ) ,12) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,4) ,7) ) ,12) ) ,4,6) +transpose(shuffle(echo(transpose(((((X|X) |transpose((shuffle(X) +transpose(arpeggio(X) ,7) ) ,-5) ) +transpose(transpose(echo((X+transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,-5) ,4) ) +transpose(step(echo(step(X,12) ,4,6) ,12) ,7) ) ,-7) ,4,6) ) ,4) ) +transpose(shuffle(transpose(((transpose(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(X,7) ) ,-7) +transpose(((transpose(((X+(X+transpose(X,7) ) ) +transpose((arpeggio(X) +transpose(X,12) ) ,7) ) ,-5) +transpose(((X+X) +transpose((arpeggio(X) +transpose(X,-7) ) ,12) ) ,12) ) +transpose((echo((transpose(step(X,12) ,-7) +transpose(transpose(X,-5) ,12) ) ,4,6) +transpose(step(shuffle(shuffle(X) ) ,12) ,12) ) ,12) ) ,4) ) +transpose(step((((step((X+X) ,12) +transpose(((X+transpose(X,12) ) |X) ,7) ) |transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ) +transpose(echo(X,4,6) ,12) ) ,12) ,7) ) ,-5) ) ,7) ) ) ,-7) +transpose(((((transpose(((transpose(((((((X+X) +transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(step(X,12) ,7) ) ,4) ) +transpose(((X+X) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose((X+X) ,-5) ) ,-7) +transpose((echo(X,4,6) +transpose(((transpose((X+transpose(X,12) ) ,-7) +transpose(X,7) ) +transpose(step(X,12) ,7) ) ,12) ) ,4) ) +transpose(shuffle(shuffle(echo((X|X) ,4,6) ) ) ,7) ) ,-7) +transpose(((step(((transpose(X,-5) +transpose(((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) +transpose(shuffle((step(X,12) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ) ,4) ) +transpose((((((transpose(X,-5) |X) +transpose(echo(X,4,6) ,4) ) +transpose(step(X,12) ,7) ) +transpose(transpose(((X+X) |X) ,-7) ,7) ) |echo(step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,4,6) ) ,7) ) ,4) ) +transpose((((((arpeggio(X) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(((transpose(X,4) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +arpeggio(X) ) +transpose(((echo(transpose(X,-7) ,4,6) +transpose((transpose(transpose(X,4) ,-7) |transpose(step(shuffle(X) ,12) ,-7) ) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) |transpose((shuffle((transpose(X,4) |((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ) ) +transpose((((((X|(X+transpose(X,12) ) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) +shuffle(transpose((X+transpose(X,12) ) ,-7) ) ) +transpose(transpose((transpose(X,-5) +transpose((((X+transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(X,7) ) ,12) ) ,4) ,7) ) ,7) ) ,-5) ) +transpose((((echo(((((((transpose((X+transpose(X,12) ) ,4) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) +transpose(transpose(X,-7) ,7) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) +(X+transpose(echo(arpeggio(arpeggio(X) ) ,4,6) ,7) ) ) +transpose(((((X+transpose(X,12) ) |X) +transpose((transpose(X,-5) +transpose(X,12) ) ,12) ) +transpose((transpose(step(X,12) ,-5) +transpose(arpeggio(X) ,7) ) ,7) ) ,7) ) +transpose((((transpose(((X+X) +(X+transpose(X,12) ) ) ,4) +transpose(arpeggio(((X|X) +transpose(X,12) ) ) ,4) ) +transpose((((X+transpose((arpeggio(X) |X) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) +(transpose(((X|X) +transpose(X,-5) ) ,-7) +transpose((arpeggio(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) ) ,12) ) ,4,6) +transpose((((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) |transpose(arpeggio(X) ,-7) ) +X) +transpose((echo(transpose((arpeggio(X) +(X|X) ) ,-7) ,4,6) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) ,7) ) +transpose((echo(X,4,6) |(transpose(X,-5) +((arpeggio((X+transpose(X,12) ) ) +transpose(X,4) ) +((step(transpose(X,-7) ,12) +transpose(step(step(X,12) ,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ) ) ,4) ) +transpose(step(((((X|step((X+X) ,12) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ,7) ) +shuffle(arpeggio(transpose(transpose(transpose(X,-5) ,-7) ,-7) ) ) ) ,7) ) +transpose(arpeggio((arpeggio(shuffle(((transpose((step(X,12) +(X+transpose(X,7) ) ) ,-7) +transpose(step(X,12) ,7) ) |arpeggio(transpose(step(X,12) ,4) ) ) ) ) +transpose(transpose(echo(transpose(step((arpeggio(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) |transpose(transpose(X,4) ,-7) ) ,12) ,-5) ,4,6) ,-7) ,7) ) ) ,12) ) +transpose(transpose(arpeggio((step((transpose((X|X) ,-5) +X) ,12) +transpose(transpose((transpose(transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ,-7) +arpeggio(step(transpose(X,4) ,12) ) ) ,-7) ,12) ) ) ,4) ,7) ) ,7) ) ,4) ) +transpose((transpose(transpose(transpose(arpeggio(arpeggio(((X+transpose(X,12) ) +transpose(X,7) ) ) ) ,-7) ,4) ,-7) |step((step((transpose((transpose(shuffle(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,-5) +transpose((((X+transpose(echo(X,4,6) ,4) ) +transpose(echo(step(X,12) ,4,6) ,7) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-7) ,12) ) ,12) ) ,-7) +transpose(transpose(step(echo(arpeggio(shuffle(shuffle(transpose((X+transpose(X,12) ) ,-5) ) ) ) ,4,6) ,12) ,4) ,12) ) ,12) +transpose(transpose((arpeggio(echo(shuffle(transpose(X,4) ) ,4,6) ) +transpose((transpose(((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-5) |transpose(transpose(((X+transpose(X,12) ) +transpose(shuffle((X+transpose(X,7) ) ) ,12) ) ,-7) ,-7) ) ,12) ) ,-5) ,7) ) ,12) ) ,7) ) ,4) ) +transpose(transpose((transpose(((step(transpose(((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,7) ) ,-5) ,12) +transpose(transpose((shuffle(step(shuffle(transpose(transpose(transpose(X,-7) ,4) ,-7) ) ,12) ) +transpose(transpose(arpeggio(echo(echo(X,4,6) ,4,6) ) ,-7) ,12) ) ,-7) ,12) ) +transpose(shuffle(transpose(X,-7) ) ,12) ) ,-7) +transpose((step(step(shuffle(((echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) +transpose((echo(X,4,6) +transpose(X,12) ) ,7) ) +transpose(shuffle(transpose(echo(transpose(X,-7) ,4,6) ,-7) ) ,7) ) ) ,12) ,12) +transpose(transpose(arpeggio(((((echo((X+transpose(X,7) ) ,4,6) +transpose((step((X+X) ,12) |arpeggio((X+X) ) ) ,4) ) +transpose(echo(X,4,6) ,7) ) |((transpose(X,4) +transpose((transpose(X,4) +transpose((transpose(X,-5) |step(X,12) ) ,12) ) ,4) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ) +step((step(transpose(X,-5) ,12) +transpose(echo(transpose(shuffle(X) ,-5) ,4,6) ,7) ) ,12) ) ) ,-7) ,7) ) ,12) ) ,4) ,7) ) ) ,4,6)
random seed used was 155704533

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