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 20 generations the expression "X" became this:
(echo((transpose(echo((arpeggio(((((transpose((((arpeggio(X) +transpose((X|X) ,12) ) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) +transpose(shuffle(step((X+transpose(X,-5) ) ,12) ) ,7) ) +transpose(shuffle((arpeggio(transpose(X,-5) ) +transpose(((X|X) +transpose(X,12) ) ,12) ) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((arpeggio(((echo(arpeggio(X) ,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ) +transpose((transpose(X,-5) +transpose(step(X,12) ,-7) ) ,12) ) ,12) ) ) |(transpose(transpose(step(echo(transpose(X,4) ,4,6) ,12) ,-5) ,-7) |step(shuffle(arpeggio(echo(X,4,6) ) ) ,12) ) ) ,4,6) ,4) |(transpose(shuffle((transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |transpose(transpose((X|X) ,-5) ,-7) ) +transpose(((transpose(step(X,12) ,-7) |transpose(transpose((X+transpose(X,7) ) ,4) ,-7) ) |((transpose((X|X) ,-7) +transpose((transpose((X+X) ,-7) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ) ,12) ) ,-7) |(((echo((transpose(arpeggio(X) ,-7) |echo(X,4,6) ) ,4,6) +shuffle(step(transpose((X+transpose(X,7) ) ,-7) ,12) ) ) +transpose(echo(transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ,4,6) ,12) ) +transpose((transpose(transpose((transpose(X,-7) |(X+transpose(X,-7) ) ) ,-7) ,-7) +transpose(echo(transpose(((((X+transpose(X,7) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) |((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ) ,-5) ,4,6) ,12) ) ,7) ) ) ) ,4) +transpose((((((transpose(step((transpose(shuffle(step(X,12) ) ,-5) +transpose(((arpeggio(X) |echo((X+transpose(X,12) ) ,4,6) ) |shuffle(echo(transpose(X,-7) ,4,6) ) ) ,12) ) ,12) ,-7) +transpose(transpose((transpose((transpose(X,-7) |(X+transpose(X,7) ) ) ,4) +transpose((transpose((((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) +transpose((shuffle(X) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,12) ) ,-7) ,7) ) +transpose(transpose(((transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ,-7) +transpose(((shuffle(transpose((transpose(step(X,12) ,-7) +shuffle(echo(X,4,6) ) ) ,-7) ) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +transpose((step(X,12) +transpose(transpose(X,-7) ,7) ) ,7) ) ,4) ) +transpose(step(arpeggio(X) ,12) ,7) ) ,12) ) +transpose(step(echo(transpose(X,-7) ,4,6) ,12) ,7) ) ,-7) ,4) ) +transpose((transpose((((transpose(echo(X,4,6) ,-7) +transpose(X,7) ) +transpose(((X+transpose((X+transpose(X,12) ) ,7) ) +transpose(X,-7) ) ,12) ) |arpeggio((shuffle(transpose(X,4) ) +((arpeggio(X) +transpose(transpose(X,-7) ,12) ) +(((X+transpose(X,12) ) +transpose(shuffle(step(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ) ) ) ,-5) |(transpose(step(X,12) ,-7) +(step(transpose((shuffle(X) +transpose(echo(X,4,6) ,7) ) ,-5) ,12) +transpose(echo(transpose(((echo(X,4,6) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +step(X,12) ) ,-7) ,4,6) ,12) ) ) ) ,7) ) +transpose(((((((step((X|X) ,12) +((transpose(transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-5) ,-7) +transpose((transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) ,-5) +transpose(shuffle(X) ,12) ) ,4) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ) +transpose(arpeggio(transpose(echo(X,4,6) ,-5) ) ,4) ) +transpose(((((((X+transpose(step(transpose(X,-5) ,12) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) +transpose(echo(echo((X+X) ,4,6) ,4,6) ,7) ) +transpose(transpose(step(arpeggio(X) ,12) ,-7) ,12) ) +transpose(transpose(transpose((transpose(X,4) +transpose(X,7) ) ,-7) ,-7) ,12) ) +transpose((transpose(shuffle(shuffle((arpeggio(X) +transpose((X+transpose(X,12) ) ,12) ) ) ) ,-7) |(((transpose(X,-5) |X) +transpose(step(transpose((X+transpose(X,7) ) ,4) ,12) ,7) ) +transpose(((X+transpose(X,7) ) |(arpeggio(X) +transpose(X,12) ) ) ,-7) ) ) ,7) ) ,7) ) +transpose(transpose(((((transpose(X,4) +(X+(X+transpose(X,12) ) ) ) +transpose(transpose(X,4) ,7) ) |((step(X,12) +transpose((transpose((step(X,12) +transpose(X,12) ) ,4) +(arpeggio(X) +(X+transpose(X,7) ) ) ) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ) +(((transpose((arpeggio(X) +(transpose(X,4) +transpose(transpose(X,-7) ,12) ) ) ,-7) +transpose(shuffle(((X+transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) ) ,4) ) +transpose(((step((X+transpose(X,12) ) ,12) +transpose(shuffle(X) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) ,7) ) +(shuffle(transpose(echo(X,4,6) ,-7) ) +transpose(transpose((((X+transpose(X,12) ) |echo(X,4,6) ) +transpose(echo(X,4,6) ,12) ) ,-7) ,12) ) ) ) ,4) ,12) ) +transpose((echo(echo(transpose(transpose((X+(echo(X,4,6) +transpose(transpose(X,-7) ,12) ) ) ,-5) ,4) ,4,6) ,4,6) +(transpose(arpeggio((arpeggio(shuffle(X) ) +((shuffle(X) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ) ) ,-7) |transpose((((echo((X+transpose(X,7) ) ,4,6) +((X+transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) +(((X+X) +transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((transpose(transpose(X,-7) ,-7) +transpose(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,4) ) +transpose(((step((X+X) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((transpose(step(X,12) ,-5) +transpose(X,12) ) ,12) ) ,7) ) ,-5) ) ) ,4) ) +transpose((shuffle(((arpeggio((arpeggio(X) +transpose(X,7) ) ) |(((X+transpose(arpeggio(X) ,12) ) +transpose((shuffle(X) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) +transpose(transpose(((transpose(transpose(X,-7) ,-5) +transpose(((step(X,12) +transpose(X,7) ) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,7) ) ,7) ) |echo(transpose(X,-5) ,4,6) ) ,4) ,12) ) ) |transpose((shuffle(transpose(X,-7) ) +transpose((shuffle(echo(X,4,6) ) +transpose((transpose(X,4) |X) ,12) ) ,7) ) ,-5) ) ,7) ) ,4) ) +transpose((shuffle(transpose((echo(echo((X|X) ,4,6) ,4,6) +transpose((X+X) ,12) ) ,-7) ) +transpose(arpeggio(transpose(echo(transpose(((X+arpeggio(X) ) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ,-7) ,4,6) ,-7) ) ,12) ) ,7) ) ,12) ) ) ,4,6) +transpose(transpose(((shuffle(transpose(((((((echo(shuffle((X+transpose(step(X,12) ,7) ) ) ,4,6) +transpose(arpeggio(transpose((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,-7) ) ,12) ) +transpose(((shuffle(step(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((transpose((X+transpose(X,12) ) ,-7) +transpose(X,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ,7) ) ,-7) ) +((step(shuffle((transpose(X,4) +transpose(X,7) ) ) ,12) +transpose((echo(X,4,6) |shuffle((shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) ) ) ,7) ) +transpose((((transpose((echo(echo(X,4,6) ,4,6) +transpose(echo(X,4,6) ,7) ) ,4) +echo(step((X+transpose(X,7) ) ,12) ,4,6) ) +transpose(arpeggio((arpeggio((X+transpose(X,12) ) ) +transpose(shuffle(X) ,7) ) ) ,4) ) +transpose(arpeggio(arpeggio(((transpose(X,4) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,4) ,7) ) ) ) ,7) ) ,7) ) ) +transpose((echo(step(((shuffle((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) ,4) ) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose(arpeggio((X|X) ) ,7) ) ,7) ) ,12) ,4,6) +transpose(arpeggio(((step(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose((transpose(echo((X|X) ,4,6) ,4) |(X+transpose(X,12) ) ) ,7) ) ) ,12) ) ,7) ) |transpose(arpeggio(transpose((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ,-7) ) |step(transpose(step(shuffle(step(((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) |echo(X,4,6) ) ,12) ) ,12) ,4) ,12) ) ,4) ) +transpose(step(transpose((shuffle(transpose(((((arpeggio(transpose((shuffle(X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,7) ) ,-5) ) +transpose(arpeggio(((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(shuffle(X) ,12) ) ) ,4) ) +transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose(X,-7) ,12) ) |(echo((shuffle(X) +transpose(transpose(X,4) ,12) ) ,4,6) |((step(X,12) +transpose(X,7) ) |transpose(transpose(X,-7) ,-5) ) ) ) ,7) ) +transpose((((transpose((X+transpose(transpose(X,4) ,7) ) ,-7) +transpose(step(((X+transpose(step(X,12) ,12) ) +transpose(shuffle(transpose(X,-7) ) ,12) ) ,12) ,4) ) +transpose((((transpose((X+transpose(X,12) ) ,-7) +transpose(transpose(X,-5) ,12) ) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) ,7) ) +transpose(transpose(echo((X+transpose(transpose(X,-7) ,12) ) ,4,6) ,-7) ,12) ) ,7) ) +transpose(((transpose((transpose(transpose(shuffle(X) ,-5) ,4) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,4) +transpose(transpose(shuffle(transpose(echo(X,4,6) ,-7) ) ,-7) ,7) ) +transpose((transpose((transpose((shuffle(X) +X) ,-7) +transpose(((X+transpose(X,7) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,12) ) ,-7) |arpeggio(shuffle((arpeggio(X) +transpose(transpose((X+X) ,-7) ,7) ) ) ) ) ,7) ) ,12) ) ,-7) ) |((shuffle(transpose(arpeggio(X) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) |transpose(transpose(step(shuffle(echo(X,4,6) ) ,12) ,4) ,4) ) ) ,-7) ,12) ,12) ) +transpose(transpose(transpose(echo(((echo(echo(transpose(echo(((X+transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,4,6) ,-7) ,4,6) ,4,6) +transpose(((((shuffle(((arpeggio(((((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(X,-7) ,7) ) +transpose((transpose(step(X,12) ,-7) +transpose(step((X+X) ,12) ,12) ) ,7) ) ) +transpose(((X+X) +transpose(((arpeggio(X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(((shuffle(((X+transpose(X,12) ) +transpose(X,-7) ) ) +transpose((X|X) ,12) ) +transpose(transpose(step(step(X,12) ,12) ,-7) ,12) ) ,7) ) ) +transpose(transpose(arpeggio(arpeggio((step(transpose(X,4) ,12) +transpose(step((transpose(X,4) +transpose(transpose(step(X,12) ,-7) ,7) ) ,12) ,7) ) ) ) ,-5) ,4) ) +transpose(((step((X+X) ,12) +transpose(((arpeggio(X) |(X+transpose(X,12) ) ) +shuffle(X) ) ,12) ) +transpose(shuffle(arpeggio(X) ) ,12) ) ,7) ) +transpose(echo(transpose((shuffle((transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-7) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) ) +(step((X+transpose(step(X,12) ,7) ) ,12) +arpeggio(transpose(step(X,12) ,-7) ) ) ) ,4) ,4,6) ,4) ) +transpose(arpeggio(((transpose(((step((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) +transpose(echo(X,4,6) ,12) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose(((X|X) |shuffle(X) ) ,7) ) ,7) ) ,-7) +transpose(shuffle(arpeggio(transpose(X,-7) ) ) ,7) ) |((transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) |(shuffle(transpose(X,-7) ) +arpeggio(transpose(X,-7) ) ) ) +transpose((step((shuffle(X) +transpose((step(X,12) |X) ,7) ) ,12) |((step(((X+X) +transpose((X|X) ,12) ) ,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose((((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) |transpose(transpose(X,-7) ,-7) ) ,7) ) ) ,12) ) ) ) ,7) ) ,4) ) +transpose(((transpose(transpose(((X+transpose(step(echo(X,4,6) ,12) ,12) ) +transpose((transpose((X+transpose(X,7) ) ,-7) +transpose(transpose(X,-5) ,7) ) ,7) ) ,-7) ,4) +transpose(transpose(transpose(transpose(arpeggio(shuffle(X) ) ,-5) ,-7) ,-7) ,4) ) +transpose(shuffle(shuffle((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +(X+transpose(X,12) ) ) ) ) ,7) ) ,7) ) ,4,6) ,-7) ,-7) ,12) ) ,-7) ,12) )
random seed used was 236953422

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