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:
echo((((transpose(X,4) |shuffle((transpose((X+X) ,-7) |((X+transpose(X,12) ) +transpose(X,-5) ) ) ) ) +transpose((((echo(transpose((((X+transpose(X,7) ) +transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose(shuffle(X) ,7) ) ,-5) ,4,6) |(transpose((X+X) ,-7) +transpose((transpose(X,-7) |X) ,7) ) ) +transpose(transpose((((X|echo(X,4,6) ) +transpose(shuffle(X) ,12) ) +transpose(transpose(transpose((X+transpose(echo(X,4,6) ,7) ) ,4) ,4) ,12) ) ,-7) ,4) ) +transpose((((((((X+X) |step((X+transpose(X,12) ) ,12) ) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,7) ) +transpose((X+arpeggio(X) ) ,4) ) +transpose(transpose(transpose(shuffle(X) ,4) ,-5) ,7) ) |step(((echo(transpose(X,4) ,4,6) +transpose((transpose(X,-5) +transpose(X,-5) ) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,12) ) ,7) ) ,7) ) +transpose(transpose(arpeggio(arpeggio(echo(((echo(((X|X) +(X|X) ) ,4,6) +transpose(((X|(X+transpose(X,7) ) ) +(step(X,12) +(X|X) ) ) ,12) ) |(echo(step((echo(step(X,12) ,4,6) |(transpose(X,-7) +X) ) ,12) ,4,6) |echo((((transpose(X,4) +transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) +arpeggio(shuffle(step(X,12) ) ) ) ,4,6) ) ) ,4,6) ) ) ,-5) ,12) ) ,4,6)
random seed used was 1367631 EXPR = step(((transpose(echo(((transpose(shuffle((((shuffle(X) +shuffle(X) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose((arpeggio(X) |X) ,7) ) ) ,-7) +transpose(transpose(transpose((((transpose(X,4) +transpose(X,7) ) +transpose(step(transpose(X,-5) ,12) ,4) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ,-7) ,4) ,12) ) +transpose((transpose((transpose(X,4) |arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ) ) ,4) +transpose(echo((((step(X,12) +X) +transpose(((X+X) +shuffle(X) ) ,7) ) |arpeggio((X|X) ) ) ,4,6) ,12) ) ,12) ) ,4,6) ,-7) +transpose(step((shuffle(transpose(step(X,12) ,4) ) +(shuffle(((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +X) ,12) ) +step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ) +transpose((step((echo(X,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) +transpose(transpose((((X|X) |(X|X) ) +(transpose((X+X) ,-5) +X) ) ,-7) ,12) ) ,12) ) ) ,12) ,7) ) |(transpose(step(transpose(echo(((transpose(((X+transpose((X|(X+transpose(X,12) ) ) ,4) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-5) +transpose(step(step(echo(shuffle(X) ,4,6) ,12) ,12) ,4) ) +transpose(((transpose((((X+X) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,4) +(transpose(transpose(X,4) ,-7) |step(X,12) ) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,4,6) ,-5) ,12) ,-5) +transpose((shuffle((transpose((arpeggio(transpose(X,4) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,4) +transpose((((X|transpose(X,4) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ,-5) ) ) |(transpose((transpose(shuffle(transpose((X|X) ,-5) ) ,-5) +transpose(arpeggio(arpeggio(shuffle(X) ) ) ,12) ) ,-7) |(transpose(transpose(shuffle(arpeggio(arpeggio(transpose(X,-5) ) ) ) ,4) ,-7) |transpose(transpose((transpose(transpose(((X|(X|X) ) |X) ,-5) ,-7) +transpose(transpose(shuffle(echo((step(X,12) +shuffle(X) ) ,4,6) ) ,-7) ,12) ) ,4) ,-7) ) ) ) ,12) ) ) ,12)
random seed used was 0 EXPR = echo((((shuffle((step((((X+transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,12) ) +transpose(transpose(X,-7) ,7) ) +transpose(((transpose(arpeggio(X) ,4) |(X+shuffle(X) ) ) |echo((((X|X) +transpose(X,12) ) +transpose(step(X,12) ,7) ) ,4,6) ) ,7) ) ,12) +transpose((echo(echo(transpose(X,4) ,4,6) ,4,6) |transpose(transpose(((transpose(X,4) +transpose((step(X,12) +transpose((X|X) ,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) ,-7) ) ,7) ) ) +transpose(transpose(arpeggio(step(shuffle(((transpose(step(X,12) ,-5) |transpose(((X|X) |X) ,-5) ) +echo(shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ) ,4,6) ) ) ,12) ) ,-7) ,12) ) +transpose(step(echo((((((step(transpose((X|X) ,-7) ,12) |echo((X|(X+transpose(X,12) ) ) ,4,6) ) +transpose(echo(((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(X,12) ) ,4,6) ,4) ) +transpose(((((X+transpose(shuffle(X) ,4) ) +transpose(echo(X,4,6) ,7) ) |transpose(shuffle((X+transpose(X,12) ) ) ,-7) ) +arpeggio((transpose(X,-7) +transpose((X|X) ,4) ) ) ) ,7) ) +transpose(transpose(((X|transpose(X,4) ) +(X+transpose(X,12) ) ) ,-7) ,4) ) +transpose((arpeggio((X+transpose((X|X) ,12) ) ) +(arpeggio((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ) |((((X+X) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,12) ) ) ) ,7) ) ,4,6) ,12) ,4) ) +transpose((transpose(transpose((step((step(shuffle(X) ,12) |step(X,12) ) ,12) |(((transpose(X,-5) |(arpeggio(X) +transpose(X,12) ) ) +transpose((X+transpose((X+(X|X) ) ,7) ) ,7) ) +transpose(transpose(X,-7) ,4) ) ) ,4) ,4) |transpose((arpeggio((arpeggio(X) +transpose(echo(X,4,6) ,12) ) ) |(step(X,12) |(((X+X) +transpose((X|X) ,7) ) |transpose(echo(X,4,6) ,4) ) ) ) ,-5) ) ,7) ) ,4,6)
random seed used was 0 EXPR = transpose(((((transpose(X,-5) +transpose(transpose(echo(transpose(X,4) ,4,6) ,4) ,7) ) |step((transpose((((shuffle(transpose(X,-7) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) +echo(shuffle(X) ,4,6) ) +transpose(echo((transpose((X+transpose(transpose(X,-5) ,12) ) ,4) +transpose((arpeggio(X) +(transpose(X,4) +transpose(X,4) ) ) ,12) ) ,4,6) ,12) ) ,-5) +(transpose(X,-7) +((transpose(X,-5) +transpose(transpose((((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,-5) ,4) ) +transpose((step((X+((X+X) |X) ) ,12) |transpose(echo(X,4,6) ,4) ) ,7) ) ) ) ,12) ) +transpose(echo(transpose(arpeggio(transpose(((((X+X) +transpose((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose(transpose((shuffle(X) |(X+transpose(X,12) ) ) ,-5) ,7) ) |transpose(transpose((X+transpose(transpose(X,-5) ,12) ) ,-5) ,-7) ) ,-7) ) ,4) ,4,6) ,7) ) +(arpeggio((((transpose((transpose(((X+X) +echo(X,4,6) ) ,-7) |(arpeggio((X+X) ) +step(X,12) ) ) ,-5) |transpose((((echo(transpose(X,4) ,4,6) +transpose(transpose(X,4) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ,7) ) ,7) ) |(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose(transpose(echo((X+X) ,4,6) ,4) ,7) ) ) ,4) ) |echo(arpeggio((transpose((step(X,12) +transpose(shuffle(X) ,7) ) ,-7) +transpose(((X+transpose((transpose(X,-5) +transpose(echo(X,4,6) ,7) ) ,12) ) +arpeggio((X+transpose(X,12) ) ) ) ,12) ) ) ,4,6) ) +transpose(transpose(shuffle(((transpose(transpose((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) ,-7) ,-5) |(transpose(((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ) +transpose(step((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,12) ,12) ) ) ,-5) ,12) ) ) |((((arpeggio(echo((transpose((X|echo((X|X) ,4,6) ) ,-5) +transpose((X|transpose(X,-5) ) ,12) ) ,4,6) ) +transpose((transpose(transpose(transpose(arpeggio(X) ,4) ,-5) ,-5) |transpose(((X+transpose(X,12) ) |transpose(X,-5) ) ,-5) ) ,7) ) +transpose(((echo((((((X+transpose(X,7) ) +transpose(X,7) ) +transpose((X+transpose(transpose(X,-7) ,12) ) ,4) ) +transpose((X+shuffle(X) ) ,7) ) +transpose(((transpose(X,4) +transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,4,6) |transpose((transpose(X,-7) +transpose(((X|X) +(X+X) ) ,12) ) ,-7) ) +((echo(transpose(transpose(X,4) ,-7) ,4,6) +transpose(transpose(transpose((echo(transpose(X,4) ,4,6) +transpose((((X+X) |(X+X) ) +transpose((step(X,12) +transpose(X,-5) ) ,12) ) ,12) ) ,-7) ,-7) ,4) ) +transpose((step(((((X+X) +shuffle(X) ) +transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) +transpose(transpose(transpose(shuffle(X) ,-5) ,-7) ,7) ) ,7) ) ) ,12) ) +((((echo(step(step(transpose(transpose(X,-5) ,-5) ,12) ,12) ,4,6) +transpose(transpose(((transpose(X,4) +transpose(shuffle(X) ,7) ) +transpose(((X+X) +transpose(shuffle(X) ,7) ) ,4) ) ,4) ,7) ) +(transpose(((step((transpose(X,-5) |transpose(X,4) ) ,12) +transpose(transpose((transpose(X,4) +step((X+X) ,12) ) ,-7) ,4) ) +transpose((transpose(X,4) |(X+transpose(step(X,12) ,12) ) ) ,7) ) ,-5) +((step(X,12) +transpose(transpose((X|(X+X) ) ,-5) ,7) ) +transpose(((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |(transpose(X,-7) +transpose(echo(X,4,6) ,7) ) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose((shuffle(X) +transpose(transpose(X,-5) ,12) ) ,-7) ,7) ) ,12) ) ) ) +(step((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(shuffle(X) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ,12) +transpose(step((((transpose(X,4) |X) +transpose(transpose(X,-7) ,12) ) +(((X|X) +transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,12) ,12) ) ) +(((transpose(transpose(step(X,12) ,4) ,-7) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) |((transpose(X,4) |transpose((X+transpose(step(X,12) ,12) ) ,4) ) +(X+(transpose(X,-5) +transpose(step(X,12) ,12) ) ) ) ) |((transpose(X,4) +((((X|X) +transpose((X+transpose(X,12) ) ,7) ) |transpose(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ,-5) ) +((X+transpose(transpose(X,-7) ,12) ) +transpose(step(X,12) ,-7) ) ) ) +transpose(echo(((step(X,12) +transpose(X,12) ) +transpose(X,-7) ) ,4,6) ,-7) ) ) ) ) |((transpose((transpose(step(X,12) ,-5) +transpose(arpeggio(transpose(echo(X,4,6) ,4) ) ,-7) ) ,4) |(shuffle((arpeggio(((X+transpose(X,12) ) |X) ) +transpose(transpose(echo(transpose(X,-7) ,4,6) ,-7) ,7) ) ) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(shuffle(shuffle(X) ) ,-5) ) ) ) +shuffle(shuffle(arpeggio(transpose(transpose((step(transpose((X|X) ,-7) ,12) +transpose(echo(step(transpose(X,-5) ,12) ,4,6) ,7) ) ,4) ,-5) ) ) ) ) ) ) ) ,4)
random seed used was 0

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