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(transpose(transpose(transpose(transpose(step(echo(((transpose(step(X,12) ,-5) +transpose(((transpose(transpose(X,4) ,-5) +transpose((transpose(X,-7) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,4,6) ,12) ,-5) ,-5) ,-7) ,4) ,-7) ,4) +transpose(transpose(transpose(((echo(transpose((transpose(echo(X,4,6) ,-7) +transpose((transpose(X,-5) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,-5) ,4,6) +transpose(transpose(shuffle((shuffle(shuffle((X+X) ) ) +transpose(echo(transpose((transpose(X,-7) +transpose(transpose(X,4) ,12) ) ,-7) ,4,6) ,12) ) ) ,-5) ,4) ) +transpose((arpeggio(step((transpose(X,4) +transpose((X|X) ,7) ) ,12) ) +transpose(transpose(transpose(transpose((echo(X,4,6) +transpose((X+step(X,12) ) ,7) ) ,4) ,-5) ,-7) ,12) ) ,7) ) ,4) ,-7) ,7) )
random seed used was 234792112 EXPR = arpeggio(step((arpeggio(step((transpose(((arpeggio(arpeggio(X) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,4) +transpose(transpose(shuffle((transpose(X,-7) +transpose(((X+transpose(X,7) ) +transpose(X,-7) ) ,12) ) ) ,-7) ,7) ) ,12) ) +transpose(((transpose((transpose((transpose(transpose(X,-7) ,-5) +transpose(step(shuffle((X+transpose(X,12) ) ) ,12) ,7) ) ,-7) |(shuffle((echo(X,4,6) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ) +transpose((step(X,12) +transpose(((X+transpose(X,7) ) |transpose(X,-5) ) ,12) ) ,7) ) ) ,-7) +transpose(transpose(transpose(shuffle(X) ,4) ,-5) ,4) ) +transpose(transpose(((transpose((transpose(X,4) +transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,-5) +transpose(transpose(transpose(X,4) ,4) ,12) ) +transpose(((transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) |(transpose((shuffle(X) +transpose(((X+X) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ,4) +transpose((echo((((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ,4,6) |arpeggio(transpose((X+transpose(X,7) ) ,-7) ) ) ,7) ) ) +transpose(((transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) ,-5) +transpose(transpose(step(X,12) ,-5) ,12) ) +transpose(transpose(transpose(transpose((X+transpose(X,-5) ) ,4) ,4) ,4) ,7) ) ,12) ) ,12) ) ,-7) ,7) ) ,4) ) ,12) )
random seed used was 0 EXPR = shuffle(transpose(((arpeggio((echo(transpose((((transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,4) ,4,6) +transpose(transpose(step(transpose(X,-7) ,12) ,4) ,12) ) ) +transpose((transpose((echo(X,4,6) +transpose((arpeggio(echo(transpose(X,4) ,4,6) ) +((shuffle(((transpose(transpose(X,4) ,-5) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(((step(((transpose(X,-7) +transpose(transpose((X|X) ,-5) ,4) ) +transpose((shuffle(X) +X) ,7) ) ,12) +transpose(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ,4) ) +transpose(transpose(((X|X) +transpose(X,7) ) ,4) ,7) ) ,4) ) +transpose(arpeggio(transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) ,7) ) ) ,7) ) ,-5) +transpose((shuffle(transpose((transpose((X+transpose(X,12) ) ,-7) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,-5) ) +transpose(shuffle(transpose(((transpose(X,-5) +transpose(step(X,12) ,12) ) +(X+X) ) ,-7) ) ,12) ) ,12) ) ,4) ) +transpose(transpose(transpose((arpeggio((transpose(transpose(X,-5) ,-5) +transpose(echo(X,4,6) ,7) ) ) +transpose(shuffle(transpose(transpose((transpose(X,4) +transpose(X,12) ) ,-5) ,4) ) ,12) ) ,4) ,4) ,7) ) ,4) )
random seed used was 0 EXPR = ((((transpose((((((transpose(arpeggio(X) ,-7) |step(X,12) ) +transpose((((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ,4) ) +transpose(transpose(echo(transpose(X,4) ,4,6) ,4) ,7) ) +transpose(transpose(transpose(((X+transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ,-5) ,12) ) ,7) ) |((((((arpeggio((X+transpose(X,12) ) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) +transpose(echo(transpose(transpose(X,-7) ,4) ,4,6) ,4) ) +transpose(shuffle((transpose(X,-5) +transpose(X,-5) ) ) ,7) ) +transpose(transpose(transpose(shuffle(X) ,-7) ,4) ,12) ) |(transpose((transpose(transpose(X,4) ,-5) +transpose((((transpose(X,-7) +transpose(step(X,12) ,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((transpose(X,4) |transpose(X,4) ) ,7) ) ,7) ) ,-5) +transpose(X,7) ) ) ) +transpose((((((echo(transpose(X,-5) ,4,6) +transpose(step(transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,-5) ,12) ,12) ) +transpose((((step(shuffle((((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +X) ) ,12) +transpose(step(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,12) ,4) ) +transpose((transpose((transpose(X,4) +transpose(step((X+X) ,12) ,7) ) ,4) +shuffle((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(step(X,12) ,7) ) ) ) ,7) ) |transpose(transpose(transpose(arpeggio(X) ,-7) ,-7) ,-7) ) ,4) ) +transpose((((arpeggio(X) +transpose(((echo(X,4,6) +transpose(transpose(X,4) ,12) ) +transpose((transpose(X,4) |transpose(X,-5) ) ,7) ) ,7) ) +((((X+transpose(X,12) ) +transpose(X,-7) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) +transpose(((transpose(transpose(X,4) ,-5) +transpose(transpose(step(X,12) ,-7) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,7) ) ) |((echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) +transpose((transpose(shuffle(X) ,4) +transpose(((((X+transpose((X+X) ,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,12) ) ,4) ) +transpose(transpose(((X+((X|X) +transpose(X,7) ) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,-7) ,7) ) ) ,7) ) +transpose(transpose(shuffle(transpose(shuffle((X+transpose(X,7) ) ) ,-5) ) ,4) ,4) ) +transpose(step((transpose(transpose(step(X,12) ,4) ,-7) +transpose(((((transpose((X+transpose(X,12) ) ,-7) +transpose((transpose(shuffle(X) ,4) +transpose((shuffle(step(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,4) ) +transpose((shuffle(transpose(X,-5) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ,7) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ,4) ,4) ) +transpose(transpose(step(transpose(X,4) ,12) ,4) ,7) ) ,12) ) ,12) ,7) ) ,4) ) +transpose((transpose(arpeggio(step(((transpose((X+transpose(X,7) ) ,-7) +step(transpose(X,4) ,12) ) +transpose((transpose(((X|X) +transpose(X,7) ) ,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,12) ) ,-5) +transpose(step(((step((echo(transpose(arpeggio(X) ,-7) ,4,6) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,12) ) ,12) +transpose((((transpose(X,4) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) +transpose(transpose(transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,4) ,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(((X+transpose(X,7) ) +(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) ,7) ) ,12) ,7) ) ,7) ) ,-7) +transpose((shuffle(transpose((echo((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) ,4,6) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) ,-7) ) +transpose(transpose(step((transpose(transpose(transpose(X,4) ,-7) ,4) +transpose((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ) +transpose(shuffle(X) ,7) ) ,12) ) ,12) ,-7) ,12) ) ,4) ) +transpose(((((transpose((((echo(echo(((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(arpeggio(transpose(step(X,12) ,-7) ) ,12) ) ,4,6) ,4,6) +transpose((echo(shuffle(transpose(X,4) ) ,4,6) +((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(step(X,12) ,7) ) ) ,7) ) +transpose(shuffle(transpose(arpeggio(arpeggio(X) ) ,4) ) ,4) ) +transpose(shuffle(transpose(((transpose(X,4) +transpose(arpeggio(transpose(arpeggio(X) ,-7) ) ,12) ) +transpose(echo(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,12) ) ,-5) ) ,7) ) ,-7) +transpose(step(transpose((transpose((transpose(X,4) +transpose(X,-5) ) ,-7) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,-5) ,12) ,12) ) +transpose((transpose(transpose((echo(X,4,6) +(X|X) ) ,-7) ,4) +transpose(transpose((((X+transpose(((step(X,12) |(X|X) ) +transpose(X,4) ) ,12) ) +transpose(((((X+transpose(X,7) ) +transpose(X,-5) ) +transpose(((X+transpose(X,7) ) +transpose((X|X) ,12) ) ,4) ) +transpose((((X+transpose((X+transpose(X,12) ) ,7) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,4) ) +transpose(((((X+X) +arpeggio(step(X,12) ) ) +transpose((arpeggio((X+transpose(X,7) ) ) +transpose((transpose(X,4) +transpose(X,7) ) ,7) ) ,4) ) +transpose((transpose(X,-7) +transpose(transpose((X|X) ,-5) ,7) ) ,7) ) ,7) ) ,4) ,12) ) ,7) ) +transpose(((arpeggio((echo(transpose(transpose(transpose(X,-7) ,4) ,-7) ,4,6) +transpose(transpose(arpeggio((X+transpose((X+transpose(X,12) ) ,12) ) ) ,-7) ,12) ) ) +transpose(echo(arpeggio(arpeggio(transpose(transpose(transpose((transpose(transpose(X,-5) ,4) +transpose(X,12) ) ,-5) ,-5) ,4) ) ) ,4,6) ,4) ) +transpose(transpose(arpeggio(((((transpose(X,-7) +transpose(step((X|X) ,12) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) +transpose(((transpose(arpeggio(X) ,4) +transpose((X+transpose(X,12) ) ,7) ) +transpose(arpeggio(transpose(echo(transpose(X,-7) ,4,6) ,4) ) ,12) ) ,4) ) +transpose((((transpose(step(X,12) ,4) +transpose((X|X) ,7) ) |transpose(X,-5) ) +transpose(transpose(transpose(echo(step(X,12) ,4,6) ,-7) ,-7) ,12) ) ,7) ) ) ,4) ,7) ) ,7) ) +transpose(arpeggio(((shuffle((transpose(transpose((X+transpose(transpose(X,-7) ,12) ) ,-5) ,-5) +transpose(transpose((transpose(shuffle(X) ,-7) +transpose(((X+X) +transpose(transpose(X,-5) ,12) ) ,7) ) ,-7) ,12) ) ) +transpose(((shuffle(((arpeggio(transpose((step(X,12) +transpose(shuffle(X) ,12) ) ,4) ) +transpose(((arpeggio(transpose(X,-7) ) +arpeggio(X) ) +transpose((transpose(transpose(X,4) ,4) |(X+transpose(X,12) ) ) ,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ) +transpose(((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose(transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-5) ,-5) ,7) ) ,12) ) +transpose((X+transpose((arpeggio(X) |transpose(((transpose(X,4) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,4) ) ,12) ) ,12) ) ) ,12) ) ,7) ) +transpose(step(transpose(transpose((transpose(X,-7) |transpose(X,-7) ) ,4) ,-7) ,12) ,7) ) +transpose(echo(transpose(transpose(((transpose(shuffle(((echo(X,4,6) +transpose(shuffle(X) ,7) ) +transpose((transpose(transpose((X+X) ,4) ,-7) |transpose(X,4) ) ,12) ) ) ,-5) +transpose(arpeggio(transpose(transpose(transpose(transpose(X,4) ,-7) ,4) ,-7) ) ,4) ) +transpose(transpose((transpose(transpose((X+X) ,-7) ,-7) +transpose(transpose(X,-7) ,12) ) ,4) ,7) ) ,4) ,4) ,4,6) ,7) )
random seed used was 0

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