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 15 generations the expression "X" became this:
transpose(transpose(arpeggio(shuffle(transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ) ) ,-5) ,-5)
random seed used was 173 EXPR = shuffle(((arpeggio(echo(((shuffle(step(((X+transpose(X,12) ) |(step(X,12) +transpose(step((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,12) ) ) ,12) ) +transpose((((((((((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(step((X+X) ,12) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(((transpose(X,4) |(X+transpose(X,12) ) ) +arpeggio(step(X,12) ) ) ,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) +(shuffle((transpose((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) ,4) +transpose((arpeggio(X) +transpose(((((transpose(X,-7) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(X,4) ,12) ) |arpeggio(X) ) ,12) ) ,12) ) ) +transpose(echo(echo(((arpeggio(X) +transpose(((X+X) |(X+transpose(X,7) ) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,4,6) ,7) ) ) ,4) ) +transpose(((echo(arpeggio((arpeggio(X) +(X+transpose(X,12) ) ) ) ,4,6) +(((X+transpose((X+transpose(X,12) ) ,-5) ) +transpose(arpeggio(((X+transpose(step(X,12) ,12) ) +(X+transpose(arpeggio(X) ,12) ) ) ) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(X,12) ) +step((X+echo(X,4,6) ) ,12) ) ,7) ) ) |((((((X+transpose((X+transpose(X,12) ) ,7) ) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(echo(shuffle(X) ,4,6) ) ,7) ) +transpose((transpose(X,-7) +transpose((shuffle(X) +transpose(X,12) ) ,7) ) ,7) ) +transpose((transpose(X,-5) +transpose(step(transpose(transpose(step(X,12) ,-7) ,-7) ,12) ,12) ) ,4) ) +transpose(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,7) ) ) ,7) ) ,4,6) ) +transpose(transpose((((step((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) +transpose(((arpeggio(((X+transpose(X,7) ) +step(X,12) ) ) +transpose(arpeggio((arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) ) ,7) ) +transpose(echo(transpose((echo((X|X) ,4,6) +transpose(step(X,12) ,12) ) ,-5) ,4,6) ,7) ) ,7) ) ,12) +transpose(step(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ,12) ,4) ) +transpose(transpose(((echo(echo(transpose(step(X,12) ,-7) ,4,6) ,4,6) +transpose(step((X+X) ,12) ,12) ) |transpose(((step(X,12) +transpose(step(X,12) ,7) ) +transpose(((((X+transpose(X,7) ) +transpose(shuffle(X) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,4) ) ,-5) ,7) ) +transpose(transpose((echo(X,4,6) +transpose((echo(transpose(X,4) ,4,6) +echo(X,4,6) ) ,7) ) ,4) ,12) ) ,4) ,4) ) +transpose(((echo(transpose(((((X+transpose(X,12) ) +transpose((((echo(X,4,6) +transpose(X,12) ) |X) +transpose(arpeggio((X|X) ) ,12) ) ,7) ) +transpose((transpose(((X+transpose(step((X+transpose(X,12) ) ,12) ,12) ) +transpose(shuffle(X) ,12) ) ,4) |echo(shuffle((X+transpose(X,7) ) ) ,4,6) ) ,12) ) |((echo(transpose(echo((X|X) ,4,6) ,4) ,4,6) +transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) +transpose((((((X+transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(echo(X,4,6) ,12) ) +transpose(X,7) ) |shuffle((X+transpose(X,12) ) ) ) ,7) ) ) ,4) ,4,6) +transpose((((transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +(arpeggio(X) +transpose((X|X) ,12) ) ) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,-5) +transpose(arpeggio((((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(shuffle(X) ,7) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ) ,12) ) |step(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((X|X) +transpose((X+transpose(X,7) ) ,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +(arpeggio(arpeggio((((transpose(echo(X,4,6) ,4) +transpose((echo(X,4,6) +transpose((X+transpose((X|X) ,12) ) ,12) ) ,4) ) +transpose(step(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ,12) ,7) ) +transpose(step(step(transpose((X+transpose(X,7) ) ,-7) ,12) ,12) ,12) ) ) ) +transpose(echo(shuffle(transpose(transpose(step((X+transpose(X,12) ) ,12) ,-7) ,-7) ) ,4,6) ,12) ) ) ,4) ) +transpose((echo((shuffle(echo(step(X,12) ,4,6) ) +transpose((X+X) ,7) ) ,4,6) +transpose((transpose(transpose((((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(transpose((X+transpose(transpose(X,-5) ,12) ) ,-5) ,4) ) +transpose(echo((step(X,12) |(X+X) ) ,4,6) ,7) ) +transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) ,7) ) ,4) ,-5) +transpose(arpeggio(shuffle((echo((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose((echo(((step(X,12) +transpose(step(X,12) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) ,4,6) +(((X|X) +transpose((shuffle(X) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) ) ) ,12) ) ,7) ) ,7) ) ,7) ) )
random seed used was 0 EXPR = (echo(((shuffle((shuffle(transpose((X+transpose(((transpose(X,-7) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,-7) ) +transpose(transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,7) ) +transpose((echo(X,4,6) +transpose(((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,4) ,12) ) ) +transpose(echo((echo(((transpose(X,-7) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) +((shuffle(((X+transpose(X,12) ) +transpose((X|X) ,7) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,12) ) +transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) ,7) ) ) ,4,6) ,4) ) +transpose(step((((X+shuffle(X) ) +transpose(arpeggio(shuffle((X+transpose(X,12) ) ) ) ,7) ) +transpose((((shuffle(X) +transpose(step(X,12) ,12) ) +transpose((X+X) ,4) ) +transpose(((transpose(X,-7) +X) |arpeggio(echo(X,4,6) ) ) ,7) ) ,7) ) ,12) ,7) ) ,4,6) +transpose(((((transpose(transpose(step(echo(step(echo(transpose(X,4) ,4,6) ,12) ,4,6) ,12) ,4) ,-7) +transpose(shuffle(shuffle(((echo(transpose(arpeggio((transpose(X,4) +X) ) ,4) ,4,6) +transpose(step(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ,12) ) +transpose(shuffle(transpose(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((echo(X,4,6) +arpeggio(X) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) ,7) ) ) ) ,4) ) +transpose(((((transpose(step((step(shuffle((X+transpose(X,12) ) ) ,12) +transpose(((((X+transpose(X,7) ) |arpeggio(X) ) +transpose(step(X,12) ,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,12) ) ,12) ) ,7) ) ,12) ,4) +transpose((arpeggio(arpeggio((X+transpose(X,12) ) ) ) +transpose(transpose((echo(transpose(echo(X,4,6) ,-7) ,4,6) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) ,-7) ,7) ) ,4) ) +transpose(((shuffle((((step(X,12) +transpose(echo(X,4,6) ,-5) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) +transpose(((((X+transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(X,12) ) ,7) ) ) +transpose((((X+transpose(X,7) ) |transpose(X,4) ) +transpose((((X+transpose(((X+transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose(((X+transpose(echo(X,4,6) ,7) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,7) ) ,-7) ) ,4) ) +transpose((shuffle(echo(transpose(shuffle(echo(X,4,6) ) ,4) ,4,6) ) +transpose(((step(transpose((X+(transpose(X,4) +transpose(arpeggio(X) ,7) ) ) ,-7) ,12) +transpose((((((X+transpose(transpose(X,-5) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,12) ) |((transpose(X,-5) |(X+transpose(X,12) ) ) |echo(X,4,6) ) ) +(arpeggio(shuffle(X) ) +shuffle(X) ) ) ,4) ) +transpose(arpeggio(((arpeggio(X) +transpose((step(X,12) +step(X,12) ) ,4) ) +transpose(X,7) ) ) ,7) ) ,7) ) ,7) ) ,7) ) +transpose(step(arpeggio((((X+transpose(X,12) ) |echo(X,4,6) ) +transpose((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(step(X,12) ,12) ) ,7) ) |(X+transpose(X,12) ) ) ,7) ) ) ,12) ,4) ) +transpose(echo((echo(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4,6) |((((echo(X,4,6) |transpose(X,-7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) +(echo((X+transpose((X+transpose(X,7) ) ,7) ) ,4,6) +transpose(transpose(X,4) ,12) ) ) ) ,4,6) ,7) ) ,7) ) +transpose(((echo(echo(transpose(((arpeggio(X) |X) +transpose(X,12) ) ,4) ,4,6) ,4,6) +transpose(step((((X+transpose(X,7) ) |(X+X) ) +transpose(arpeggio(((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) +transpose((X+X) ,7) ) ) ,12) ) ,12) ,12) ) +transpose(((echo(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-7) ,4,6) +transpose(arpeggio(transpose(shuffle(transpose(((transpose(X,-7) +transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) ,-7) ) ,-5) ) ,12) ) |transpose(transpose(transpose(step(X,12) ,4) ,-5) ,-7) ) ,7) ) ,4) ) +transpose(((shuffle((transpose(arpeggio((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) +transpose(transpose(echo(step(X,12) ,4,6) ,-7) ,7) ) ) ,4) +transpose(shuffle(transpose((shuffle((step(X,12) +(((X+transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ) +transpose(step(((X|X) +transpose((X+transpose(X,7) ) ,7) ) ,12) ,12) ) ,-5) ) ,12) ) ) +transpose(echo(step(((((echo((X|X) ,4,6) +transpose(arpeggio(X) ,4) ) +transpose(((X|X) |(X+transpose(X,12) ) ) ,7) ) +(echo((X+transpose(X,12) ) ,4,6) +transpose((transpose(X,-7) +X) ,12) ) ) +transpose((shuffle(transpose(X,-7) ) |X) ,-5) ) ,12) ,4,6) ,12) ) +transpose((step(transpose(shuffle(X) ,-7) ,12) |((((transpose(X,-5) +transpose((step(step(X,12) ,12) +transpose(step(echo(X,4,6) ,12) ,7) ) ,12) ) +transpose(((shuffle((X+transpose(X,7) ) ) +transpose(step(shuffle(X) ,12) ,12) ) |echo(echo((X+transpose(X,12) ) ,4,6) ,4,6) ) ,7) ) +transpose((step(((transpose((X+transpose(X,12) ) ,-7) +transpose(arpeggio((X+transpose(arpeggio(X) ,7) ) ) ,4) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ,12) +transpose(echo(step((echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) ,12) ,4,6) ,4) ) ,12) ) +transpose(step(arpeggio(transpose(step(echo(arpeggio(X) ,4,6) ,12) ,-7) ) ,12) ,7) ) ) ,12) ) ,7) ) ,12) )
random seed used was 0 EXPR = transpose(transpose(transpose((((shuffle(transpose(shuffle(transpose((X+transpose(X,12) ) ,-5) ) ,-5) ) +transpose((echo(arpeggio(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,4,6) +transpose(echo((transpose((X+transpose(X,12) ) ,-7) +transpose(shuffle(((arpeggio(X) +transpose((X|(X+transpose(X,7) ) ) ,4) ) +transpose(step(X,12) ,7) ) ) ,12) ) ,4,6) ,12) ) ,7) ) +transpose((shuffle((echo((((X+transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,4,6) +transpose((X+arpeggio(X) ) ,12) ) ) |(step(echo(echo(transpose(X,-7) ,4,6) ,4,6) ,12) +(echo(X,4,6) |(arpeggio(X) +transpose((arpeggio(X) |X) ,12) ) ) ) ) ,12) ) |arpeggio(transpose(((((shuffle((X+transpose(X,7) ) ) +transpose(X,12) ) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) +transpose(arpeggio((arpeggio((X+transpose((X+transpose(X,12) ) ,7) ) ) +transpose((arpeggio(X) +transpose(X,4) ) ,12) ) ) ,7) ) ,4) ) ) ,4) ,-7) ,4)
random seed used was 0

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