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 19 generations the expression "X" became this:
((echo((transpose((arpeggio(echo(transpose(transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ,4) ,4,6) ) +transpose(shuffle(shuffle(((transpose(shuffle(arpeggio(transpose(X,-5) ) ) ,-5) +transpose(((transpose(echo(transpose(X,-5) ,4,6) ,-7) +transpose(echo(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ,4,6) ,12) ) +transpose(transpose(X,-7) ,-7) ) ,12) ) +transpose(((transpose(echo(step(X,12) ,4,6) ,-7) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose((echo(X,4,6) +transpose(transpose(X,4) ,-7) ) ,7) ) ,12) ) ) ) ,12) ) ,4) +transpose((echo((transpose(echo(shuffle(step(transpose(shuffle(X) ,-7) ,12) ) ,4,6) ,4) +transpose((arpeggio(((arpeggio(transpose(X,-7) ) |(transpose(transpose(X,-5) ,-7) +transpose(((((echo(X,4,6) +transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) +transpose((transpose(X,-7) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(((X+X) +echo(transpose(X,4) ,4,6) ) ,4) ) +transpose(step((X+X) ,12) ,7) ) ,12) ) ) +transpose((transpose((X|transpose((X+transpose(X,12) ) ,-7) ) ,-7) +transpose(echo(transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) ,-7) ,4,6) ,7) ) ,7) ) ) +transpose((echo((((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) +transpose(X,7) ) |echo(((transpose(X,-7) +transpose((X+X) ,4) ) +transpose(X,7) ) ,4,6) ) ,4,6) +transpose(echo(transpose(((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) ,-7) ,4,6) ,12) ) ,12) ) ,12) ) ,4,6) +transpose(((echo(transpose((echo((transpose(step(X,12) ,4) +transpose(((transpose(X,-7) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ,7) ) ,12) ) ,4,6) +transpose((step(step(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,12) ,12) +transpose((transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4) ,-7) +(arpeggio(arpeggio(X) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,12) ) ,12) ) ,-5) ,4,6) +transpose(step((step(shuffle((((X|(((X+transpose((X|transpose(X,-7) ) ,12) ) +transpose(((X+transpose(X,7) ) |transpose(X,-5) ) ,4) ) +transpose((shuffle(X) |arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) ) +transpose((echo(X,4,6) +transpose(((transpose(X,-7) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,4) ) +transpose(shuffle(arpeggio(transpose(transpose(X,-5) ,4) ) ) ,7) ) ) ,12) +transpose(step(echo((((X+X) +transpose(X,12) ) +step((X+transpose(X,12) ) ,12) ) ,4,6) ,12) ,7) ) ,12) ,4) ) +transpose(step(((arpeggio(step((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose(X,-5) ,12) ) ,12) ) +transpose(arpeggio(transpose((transpose(X,-5) |transpose(X,-7) ) ,-5) ) ,4) ) +transpose(((((transpose(arpeggio(X) ,-5) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(transpose(arpeggio(step(X,12) ) ,4) ,4,6) ,7) ) +transpose(echo(step(echo((X+transpose(X,12) ) ,4,6) ,12) ,4,6) ,12) ) ,7) ) ,12) ,7) ) ,7) ) ,12) ) ,4,6) +transpose(transpose((((arpeggio(echo(transpose(shuffle(transpose(((arpeggio(X) +transpose(arpeggio(X) ,7) ) +transpose(transpose(X,4) ,7) ) ,-7) ) ,4) ,4,6) ) +transpose(((transpose(echo((((((((transpose(X,-7) +transpose((X|X) ,7) ) +transpose(transpose((X|X) ,-7) ,4) ) +transpose((X+transpose((X+transpose((X|X) ,7) ) ,7) ) ,7) ) +arpeggio(step(X,12) ) ) +transpose(((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) +X) +transpose((((echo((arpeggio(X) +transpose(X,12) ) ,4,6) |(echo(X,4,6) +transpose(step(X,12) ,7) ) ) +transpose(((X|echo(X,4,6) ) |step(transpose(X,4) ,12) ) ,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(step(step(((step((X+transpose(X,7) ) ,12) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ,12) ,7) ) |((step((X+transpose(X,7) ) ,12) +transpose((arpeggio(X) +transpose((((X|X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,12) ) ,12) ) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ) ,4,6) ,-7) +transpose(transpose(echo((arpeggio(((step(transpose(X,-7) ,12) +transpose(arpeggio(X) ,12) ) +transpose(step(echo(X,4,6) ,12) ,7) ) ) +(step((((X+transpose((X+X) ,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ,12) +transpose(transpose(shuffle((X+transpose(X,7) ) ) ,-5) ,12) ) ) ,4,6) ,4) ,12) ) +transpose(transpose((((step(echo(step(transpose(X,-7) ,12) ,4,6) ,12) +transpose((step(transpose((X+transpose(X,7) ) ,-7) ,12) |(arpeggio(shuffle(X) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) ,7) ) +transpose((transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ,-5) +transpose(echo((X+X) ,4,6) ,7) ) ,4) ) +transpose((((step((((X+transpose(X,7) ) +transpose(shuffle(shuffle(X) ) ,12) ) +transpose(shuffle(X) ,12) ) ,12) +transpose((((transpose((X+transpose(X,12) ) ,-7) +transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose(echo((((X+X) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,7) ) +(transpose(transpose(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ,-7) ,-7) +transpose(((X+transpose((arpeggio(X) +transpose(X,12) ) ,4) ) +transpose(echo(((X+transpose(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,7) ) ,12) ) ) ,7) ) ,-7) ,12) ) ,7) ) +transpose((transpose((transpose(transpose(transpose(step((shuffle(step(X,12) ) +transpose(arpeggio(transpose(transpose(X,-7) ,4) ) ,7) ) ,12) ,-7) ,-5) ,4) +transpose(shuffle(arpeggio(((transpose(transpose(transpose(transpose(X,-5) ,-5) ,-7) ,4) +transpose(arpeggio(shuffle(step(((transpose(X,-5) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,12) ) ) ,12) ) |step(((echo(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ,4,6) +transpose((((echo(X,4,6) +transpose(X,12) ) |arpeggio(echo(X,4,6) ) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) ,4) ) +transpose((step((transpose((X+transpose(X,12) ) ,-7) +transpose((X+transpose(X,12) ) ,7) ) ,12) +transpose((arpeggio((((X+X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) +transpose((X+transpose(arpeggio(X) ,12) ) ,12) ) ,7) ) ,7) ) ,12) ) ) ) ,7) ) ,-7) +transpose((arpeggio(transpose(((((transpose((((((X+transpose((X|X) ,12) ) +transpose((step(X,12) |(X+transpose(X,7) ) ) ,4) ) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,4) +transpose(transpose(arpeggio(transpose(echo(X,4,6) ,-7) ) ,-5) ,7) ) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-5) ,4) ) +transpose((((arpeggio(transpose(shuffle(X) ,-7) ) +transpose((X+transpose(X,4) ) ,4) ) +transpose(((((X+transpose(X,7) ) +transpose(echo(step(X,12) ,4,6) ,12) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(arpeggio(transpose((X+transpose(X,12) ) ,-5) ) ,7) ) ,7) ) +transpose(X,-7) ) ,7) ) +shuffle(((((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +transpose((X+transpose(echo((X|X) ,4,6) ,12) ) ,12) ) +transpose(step(((X+X) +(X+transpose(step(X,12) ,7) ) ) ,12) ,7) ) ) ) ,-7) ) +transpose(((((echo(((step(X,12) +transpose(X,12) ) +transpose((((X|X) +transpose(echo(X,4,6) ,12) ) +transpose((X|X) ,-7) ) ,12) ) ,4,6) +step(transpose((X+transpose(X,12) ) ,-5) ,12) ) +(step(transpose((arpeggio(X) +X) ,-5) ,12) +transpose(transpose(shuffle(arpeggio((X|transpose(X,-7) ) ) ) ,-7) ,12) ) ) +transpose(shuffle(((((((X+X) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) +transpose((echo(shuffle(X) ,4,6) +transpose((echo(X,4,6) +(X+X) ) ,12) ) ,4) ) +transpose(shuffle(shuffle(transpose(transpose(X,4) ,-7) ) ) ,7) ) |((arpeggio(transpose(X,4) ) +transpose(((echo(X,4,6) |(X+transpose(X,12) ) ) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose((((echo(X,4,6) +X) +((X+transpose(X,7) ) +transpose(X,7) ) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) ,-7) ) ) ) ,7) ) +transpose(((((((((arpeggio(X) +transpose(shuffle(arpeggio(X) ) ,12) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) +transpose((shuffle(step(transpose(X,-5) ,12) ) +(transpose(transpose(X,4) ,-7) +transpose((X+transpose(arpeggio(X) ,12) ) ,12) ) ) ,4) ) +transpose(echo(shuffle(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ) ,4,6) ,7) ) |transpose(echo(transpose(shuffle(arpeggio(X) ) ,-7) ,4,6) ,-7) ) +transpose(((arpeggio(((X+transpose(X,7) ) +transpose(echo((X+X) ,4,6) ,12) ) ) +((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ) +transpose((transpose(step(transpose(arpeggio(X) ,4) ,12) ,-5) +(step(X,12) +transpose(transpose((X|X) ,-7) ,7) ) ) ,12) ) ,4) ) +transpose((((((X+transpose(echo(X,4,6) ,12) ) +transpose(transpose(X,-7) ,12) ) +(transpose(X,-7) +transpose((transpose(X,-7) +transpose(arpeggio(X) ,12) ) ,12) ) ) +transpose(step(shuffle(((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) ,12) ,7) ) +transpose((step(((X+transpose(X,12) ) +transpose(X,7) ) ,12) |shuffle(X) ) ,12) ) ,7) ) |transpose(arpeggio(shuffle(((step(echo((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ,4,6) ,12) +transpose(transpose(((X+transpose(X,7) ) +(X+transpose(X,12) ) ) ,-5) ,4) ) +transpose(((arpeggio(X) +transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ) ,-7) ) ,12) ) ,7) ) ,12) ) ,4) ) +transpose(transpose(echo(((transpose(arpeggio(transpose(((transpose(X,-7) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(((X+transpose(transpose(step(X,12) ,4) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,-7) ) ,-7) +transpose((((transpose(transpose((((X|X) +transpose(transpose(X,4) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ,-7) ,-7) +transpose(echo((arpeggio(shuffle(X) ) +transpose((shuffle((X+transpose(shuffle(X) ,12) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |arpeggio(X) ) ,12) ) ,12) ) ,4,6) ,4) ) +transpose(((transpose((((X|(X+transpose(X,7) ) ) +transpose((X+transpose(X,7) ) ,7) ) |(shuffle(shuffle(X) ) +X) ) ,4) +transpose(((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,-7) ,7) ) ,4) ) +transpose((arpeggio((X+transpose(arpeggio(X) ,12) ) ) +transpose(arpeggio((X+(X+transpose(X,7) ) ) ) ,7) ) ,7) ) ,7) ) +transpose(step((transpose((step(transpose(X,-7) ,12) +transpose((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,-7) +transpose(step(transpose((X+transpose(X,7) ) ,-7) ,12) ,12) ) ,12) ,12) ) ,4) ) +transpose((((step(arpeggio(transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,4) ) ,12) |((step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,12) +transpose((transpose(X,-5) +transpose(transpose(step(X,12) ,-7) ,12) ) ,4) ) +transpose(transpose(step((echo(X,4,6) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,7) ) ,12) ,4) ,7) ) ) +transpose((shuffle(transpose((step((X+transpose(X,12) ) ,12) +transpose((X+transpose(echo(step(X,12) ,4,6) ,12) ) ,7) ) ,-5) ) +transpose(transpose((transpose(shuffle(X) ,-7) |X) ,-7) ,12) ) ,4) ) +transpose(transpose(shuffle((((X|X) |((transpose(X,-7) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose(X,7) ) ) +transpose(step((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) ,12) ,12) ) ) ,-5) ,7) ) ,7) ) ,4,6) ,-5) ,7) ) ,-5) ,4) ) +transpose(shuffle((transpose(transpose(((arpeggio((echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4,6) |((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) ) +transpose((transpose(transpose(X,4) ,-7) |transpose((transpose(transpose(X,4) ,-7) +transpose((X+transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,12) ) ,12) ) ,-7) ) ,7) ) +transpose(((step(shuffle((arpeggio(transpose(X,-7) ) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) ) ,12) +transpose(transpose(arpeggio(transpose(((step(X,12) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) ,-5) ,7) ) +transpose(transpose(shuffle(arpeggio(X) ) ,-5) ,7) ) ,12) ) ,-7) ,-5) +transpose(((((((echo(step(arpeggio((arpeggio(transpose(X,-5) ) +((transpose(X,-7) +transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ) ,12) ,4,6) +transpose(step(((transpose(arpeggio(X) ,-7) +transpose((arpeggio((X+transpose(X,12) ) ) +shuffle(((shuffle(X) +transpose(step(X,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ) ,4) ) +transpose(((transpose(transpose(X,-7) ,4) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose((arpeggio((X+transpose(X,7) ) ) +transpose(arpeggio((((X+X) +transpose(shuffle(X) ,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) ) ,7) ) ,7) ) ,7) ) ,12) ,4) ) +transpose(shuffle(transpose(arpeggio(transpose(((echo(X,4,6) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,-5) ) ,-7) ) ,7) ) +transpose(((transpose(((((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,-5) +echo(arpeggio((((step(transpose((transpose(X,4) |X) ,4) ,12) +transpose(transpose((X+X) ,-5) ,-7) ) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio((X+transpose(step(X,12) ,7) ) ) ,7) ) ) ,4,6) ) +transpose(((step(((X|(X+X) ) +transpose(((shuffle(X) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,12) ) ,12) +transpose(transpose((echo((X|X) ,4,6) +transpose((echo(X,4,6) +transpose(step(X,12) ,12) ) ,12) ) ,4) ,4) ) +transpose((echo(shuffle(X) ,4,6) +transpose(arpeggio(((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,12) ) ,7) ) ,7) ) ,4) ) +transpose(step(transpose(step((transpose(arpeggio((X+transpose((X+transpose(X,12) ) ,12) ) ) ,-7) +transpose(transpose(echo(transpose(X,-7) ,4,6) ,4) ,-5) ) ,12) ,4) ,12) ,7) ) +transpose(transpose((arpeggio(transpose((arpeggio(X) +transpose(X,7) ) ,-7) ) +transpose((echo(shuffle(X) ,4,6) +transpose(echo(((arpeggio((X+transpose((X+transpose(X,12) ) ,12) ) ) |shuffle(((X+X) +transpose((X+transpose(X,12) ) ,7) ) ) ) +transpose((shuffle(arpeggio(X) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,7) ) ,12) ) ,4,6) ,12) ) ,7) ) ,-7) ,4) ) +transpose(echo((step(((transpose(shuffle(shuffle(echo(X,4,6) ) ) ,4) +transpose(((((echo((X+transpose((X+X) ,7) ) ,4,6) +transpose(transpose(X,-7) ,4) ) +transpose((transpose(arpeggio(X) ,4) +transpose((transpose(echo(X,4,6) ,-7) +transpose((step(X,12) +transpose(transpose(X,-7) ,7) ) ,12) ) ,7) ) ,7) ) +transpose(arpeggio(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,4) ) +transpose(((transpose(transpose(X,-7) ,-7) +transpose((transpose(transpose(X,-7) ,4) +transpose((X+transpose(X,12) ) ,4) ) ,12) ) +transpose((transpose(X,-5) +transpose(((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,7) ) ,7) ) ,12) ) +transpose(arpeggio(echo(((transpose(transpose(step(X,12) ,-7) ,-7) +transpose(((X+transpose(X,12) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,4,6) ) ,7) ) ,12) +transpose(transpose((echo((step(shuffle(transpose(X,-7) ) ,12) +transpose(((X+echo(X,4,6) ) +echo(X,4,6) ) ,7) ) ,4,6) |step(arpeggio((echo(X,4,6) |echo(X,4,6) ) ) ,12) ) ,-7) ,12) ) ,4,6) ,7) ) ,7) ) ) ,7) )
random seed used was 124694813

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