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 16 generations the expression "X" became this:
(transpose(transpose((step(transpose((transpose(transpose(echo(transpose((X+transpose((X|X) ,7) ) ,-7) ,4,6) ,-7) ,-7) +transpose(((echo((X+transpose(transpose((X|X) ,4) ,12) ) ,4,6) +transpose(step((step(echo(X,4,6) ,12) +transpose(step(shuffle(X) ,12) ,7) ) ,12) ,4) ) +transpose((transpose(transpose(step(X,12) ,4) ,-5) +transpose(transpose((transpose(X,-5) +(X+transpose(X,12) ) ) ,-7) ,12) ) ,7) ) ,7) ) ,-5) ,12) +(echo(transpose(arpeggio(transpose(transpose(transpose((arpeggio(X) |transpose(transpose(X,-7) ,-5) ) ,4) ,-5) ,4) ) ,-7) ,4,6) +transpose((((echo((arpeggio(arpeggio(transpose(X,-7) ) ) |transpose(transpose(X,-7) ,-7) ) ,4,6) +transpose((shuffle(step(X,12) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,7) ) +transpose(((((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(step(X,12) ,7) ) +transpose((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(X,-5) ) ,4) ) +transpose((echo(X,4,6) +transpose(X,12) ) ,7) ) |echo((X+transpose(X,7) ) ,4,6) ) ,12) ) +transpose((((step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,12) +transpose(echo(transpose(arpeggio(X) ,-5) ,4,6) ,12) ) +transpose(((X+transpose(X,12) ) +((transpose(X,-5) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) ) +transpose(arpeggio(step((transpose(X,4) +transpose(step(shuffle(X) ,12) ,12) ) ,12) ) ,12) ) ,7) ) ,7) ) ) ,-7) ,-5) +transpose(((((transpose(shuffle((((transpose((X+arpeggio(X) ) ,4) +transpose(((transpose(transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ,-7) +transpose(((((arpeggio(X) +transpose(X,12) ) +transpose((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,4) ) +transpose(transpose(transpose(shuffle(X) ,-7) ,-7) ,7) ) ,4) ) +transpose(step((arpeggio(X) |transpose(X,4) ) ,12) ,7) ) +transpose(transpose((echo(X,4,6) +transpose(X,7) ) ,-7) ,12) ) ) ,-7) +transpose((transpose(transpose(step((arpeggio(X) |transpose(X,-7) ) ,12) ,-7) ,-7) +transpose(transpose(transpose((transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) +transpose((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) ,7) ) ,-7) ,-5) ,12) ) ,4) ) +transpose(((((transpose((echo(((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) +transpose((X+X) ,12) ) ,4,6) +(echo(X,4,6) +transpose(shuffle(X) ,-5) ) ) ,-5) +transpose(arpeggio(shuffle(transpose(shuffle(X) ,-5) ) ) ,12) ) +transpose(echo(shuffle((transpose(X,-5) +transpose(X,12) ) ) ,4,6) ,4) ) +transpose(arpeggio(transpose((transpose(transpose(transpose((X+X) ,-5) ,-7) ,-5) +transpose((((echo(X,4,6) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((transpose(transpose(X,-5) ,-5) +transpose(step(X,12) ,12) ) ,4) ) +transpose(shuffle((transpose(X,-7) |echo(X,4,6) ) ) ,7) ) ,7) ) ,-7) ) ,7) ) |((transpose(transpose((echo(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,4,6) +transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ) ,-5) ,4) +transpose(step((step(transpose(shuffle(X) ,-7) ,12) +transpose((shuffle(step(transpose(X,4) ,12) ) |(transpose(X,-5) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ,7) ) ,12) ,12) ) +(((echo(shuffle(X) ,4,6) +transpose(shuffle((((arpeggio(transpose(X,-7) ) +transpose(X,12) ) +transpose((((shuffle(X) +echo(X,4,6) ) +transpose(X,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ) ,4) ) +transpose(arpeggio(step((echo(shuffle(X) ,4,6) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,12) ) ,7) ) |(((((X+transpose(X,7) ) +transpose((arpeggio(shuffle(X) ) +transpose(transpose(X,-7) ,-7) ) ,12) ) +transpose(transpose((X|X) ,-5) ,7) ) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-7) ,4) ) +transpose(shuffle(transpose(arpeggio(transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,-5) ) ,-7) ) ,7) ) ) ) ) ,7) ) +transpose((transpose(((arpeggio((X+transpose(X,7) ) ) +transpose(transpose(transpose((transpose(X,-7) +transpose((X|X) ,7) ) ,-5) ,-5) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,-7) ,7) ) ,-7) +transpose(((step(X,12) +transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,7) ) +transpose((transpose(X,-5) +transpose(step(X,12) ,7) ) ,7) ) ,12) ) ,7) ) +transpose(transpose(((transpose(transpose(transpose(transpose(((shuffle(X) +transpose(X,7) ) +transpose((X|(X+transpose(X,7) ) ) ,12) ) ,-5) ,-7) ,-5) ,-7) +transpose(echo(transpose(((transpose(transpose(transpose(arpeggio(X) ,-7) ,-5) ,-5) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(step(((X+transpose(X,12) ) +transpose(shuffle(X) ,12) ) ,12) ,7) ) ,-7) ,4,6) ,4) ) +transpose(step((step((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) +((X+transpose(echo(X,4,6) ,12) ) |((X+transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ) ) ,12) +transpose(transpose(transpose((((X+transpose(X,12) ) |step(X,12) ) +transpose(transpose(X,-7) ,7) ) ,-7) ,-5) ,-7) ) ,12) ,7) ) ,-7) ,7) ) ,12) )
random seed used was 209388249 EXPR = echo(transpose((transpose((arpeggio(((step(((step(arpeggio(X) ,12) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) +transpose(shuffle((X+(X+transpose(X,12) ) ) ) ,4) ) +transpose((step(X,12) +transpose(((X+transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,7) ) ) |transpose((shuffle(transpose(transpose((transpose(transpose(X,-7) ,4) +((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ) ,4) ,4) ) +transpose(transpose(transpose((echo((((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X|X) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose((transpose(X,-5) +transpose(X,7) ) ,7) ) ,4,6) |echo(transpose(X,-7) ,4,6) ) ,4) ,-5) ,12) ) ,4) ) ,-5) +transpose(transpose(transpose(shuffle((transpose((X+transpose(arpeggio(X) ,12) ) ,-5) +transpose((transpose(shuffle(transpose(X,-5) ) ,-7) +transpose(arpeggio(transpose((step(X,12) +transpose(X,12) ) ,-5) ) ,7) ) ,7) ) ) ,-5) ,-5) ,12) ) ,-5) ,4,6)
random seed used was 0 EXPR = shuffle(((arpeggio(transpose(((((((transpose(X,4) +transpose(X,7) ) +transpose(transpose(shuffle(transpose(X,-7) ) ,-7) ,12) ) +transpose(transpose(transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ,-5) ,-7) ,4) ) +transpose(step(((transpose(X,4) +X) |echo(X,4,6) ) ,12) ,7) ) +transpose(((transpose(X,-7) +transpose(arpeggio(step(arpeggio(X) ,12) ) ,12) ) +transpose((transpose(step(transpose(X,-5) ,12) ,-7) |arpeggio(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,-7) ) ) ,7) ) ,4) ) +transpose(echo((arpeggio(transpose((X+X) ,-7) ) +transpose((((((transpose(X,4) +transpose(X,12) ) +transpose(step((X+transpose(X,7) ) ,12) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose((X+transpose(X,-7) ) ,-7) ,12) ) +transpose((transpose((X+transpose(X,12) ) ,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,12) ) ,4,6) ,7) ) ,4) ) +transpose(((((((echo(arpeggio(transpose((X+transpose(X,7) ) ,-5) ) ,4,6) +transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ,-7) ) +transpose(((arpeggio(X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,7) ) +transpose((transpose(transpose(step(transpose(X,-5) ,12) ,-5) ,-5) +transpose(echo(shuffle(transpose(X,4) ) ,4,6) ,12) ) ,7) ) ,4) ) +transpose(((((step(X,12) +transpose((X+transpose(X,12) ) ,7) ) +transpose(echo((X|X) ,4,6) ,7) ) +transpose(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) +transpose(((X+X) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose((echo(transpose(X,4) ,4,6) +transpose(X,12) ) ,7) ) ,-7) ,4) ) +transpose(transpose(((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-5) ,7) ) ,7) ) +transpose(echo(((X+X) +transpose(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) ,4,6) ,4) ) +transpose(transpose(step(transpose(((transpose(transpose(X,-5) ,-5) +transpose(transpose(X,-7) ,12) ) +arpeggio(transpose(X,-5) ) ) ,-7) ,12) ,-7) ,7) ) +transpose(echo(transpose((transpose(((transpose(transpose(((X|X) +transpose(step(X,12) ,7) ) ,-5) ,4) +transpose(transpose((transpose((X+transpose(X,12) ) ,-7) |transpose(X,-7) ) ,-7) ,4) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4) +shuffle(transpose(transpose(((arpeggio(X) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,12) ) ,-5) ,-5) ) ) ,4) ,4,6) ,7) ) ,4) ) +transpose((echo(((step(transpose(step(transpose(echo(arpeggio(transpose(X,-5) ) ,4,6) ,-5) ,12) ,4) ,12) +transpose((transpose(((((echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) +transpose(echo(transpose(echo(step(X,12) ,4,6) ,4) ,4,6) ,4) ) +transpose(arpeggio(transpose(X,-7) ) ,7) ) |(arpeggio(step(transpose(X,-5) ,12) ) +((shuffle(X) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,4) ) +transpose((echo((X+transpose(X,7) ) ,4,6) +((X+transpose(X,12) ) +transpose(X,12) ) ) ,7) ) ) ) +transpose(arpeggio(transpose(shuffle(X) ,-5) ) ,7) ) ,4) +shuffle(shuffle((echo(X,4,6) |(echo((X+transpose(X,7) ) ,4,6) +step((X+X) ,12) ) ) ) ) ) ,4) ) +transpose(transpose(arpeggio(((((X+arpeggio(transpose(X,4) ) ) +transpose(echo(arpeggio((X+transpose(X,7) ) ) ,4,6) ,12) ) +arpeggio(step(transpose((X+transpose(X,7) ) ,-7) ,12) ) ) +transpose(shuffle(arpeggio(transpose(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ,-5) ) ) ,12) ) ) ,-7) ,7) ) ,4,6) +transpose((((echo(transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-5) ,4) ,4,6) +transpose(transpose((transpose(shuffle(transpose(X,4) ) ,-7) +transpose(step(((transpose(X,-7) +transpose(((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,7) ) |(X+transpose(X,7) ) ) ,12) ,7) ) ,4) ,7) ) +transpose(transpose(step(transpose(transpose(((X|X) +transpose(transpose(X,-7) ,12) ) ,-5) ,4) ,12) ,-7) ,4) ) +transpose((step((transpose(step(transpose(transpose(X,-7) ,-7) ,12) ,-5) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,-7) ,7) ) ,12) +((arpeggio((((((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) +transpose(((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) +transpose(arpeggio(transpose(X,4) ) ,12) ) +transpose(echo(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(X,-7) ,12) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) ) +transpose(((transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(shuffle((X+transpose(X,12) ) ) ,-7) ) ,4) +transpose((arpeggio((shuffle(((X|X) +transpose(transpose(X,-5) ,7) ) ) +transpose(transpose(X,-7) ,12) ) ) +transpose((X|X) ,-5) ) ,4) ) +transpose(arpeggio(echo(transpose((X|X) ,-7) ,4,6) ) ,7) ) ,7) ) |shuffle((echo(transpose((X+transpose(step(X,12) ,7) ) ,-7) ,4,6) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ) ) ,7) ) ,7) ) ,7) ) )
random seed used was 0 EXPR = transpose(transpose(transpose((((((((transpose(transpose(((X+transpose(X,7) ) |X) ,-5) ,-5) +transpose((step((((X+transpose(step(X,12) ,12) ) +transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) ,12) +transpose(((shuffle((arpeggio(X) +transpose(transpose(X,-7) ,7) ) ) +transpose((X+transpose(X,7) ) ,-5) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,7) ) ,7) ) +transpose(transpose(arpeggio(arpeggio(transpose(step(X,12) ,4) ) ) ,4) ,7) ) +transpose(transpose(transpose(echo(shuffle(X) ,4,6) ,-7) ,-7) ,4) ) +transpose((transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(((X+transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) |(step(X,12) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,7) ) ) ,-7) ,12) ) ,-7) |transpose(shuffle(transpose(echo(((X+transpose(X,7) ) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,-7) ) ,-7) ) ,7) ) +transpose(shuffle(transpose(transpose(transpose(transpose(arpeggio(transpose(X,-7) ) ,-7) ,-7) ,-5) ,-5) ) ,4) ) +transpose(shuffle(arpeggio(transpose(echo(step((transpose(X,-5) |transpose(X,4) ) ,12) ,4,6) ,-5) ) ) ,7) ) +transpose((step(transpose((arpeggio(step(X,12) ) |((X+transpose((transpose(X,-5) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ) ,4) ,12) +transpose((transpose(X,-5) |echo(X,4,6) ) ,7) ) ,7) ) ,-5) ,-5) ,-5)
random seed used was 0

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