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:
arpeggio((arpeggio((arpeggio(shuffle((((transpose(arpeggio(shuffle((((transpose((X+transpose(echo(X,4,6) ,7) ) ,-7) +transpose(arpeggio(transpose(X,-7) ) ,4) ) +transpose(step(transpose((X+X) ,4) ,12) ,7) ) +transpose(transpose(X,4) ,7) ) ) ) ,-5) +arpeggio((arpeggio((arpeggio(((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) |((shuffle(X) +transpose(((step(transpose(X,-5) ,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle((X+X) ) ,7) ) ,4) ) +transpose((step(X,12) +echo(transpose(X,-7) ,4,6) ) ,7) ) ) ) +(transpose((transpose(transpose(X,-7) ,-7) +transpose((step(X,12) +X) ,12) ) ,4) +transpose(transpose((echo(step(X,12) ,4,6) +((X+transpose(X,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,7) ) ) ,-7) ,7) ) ) ) ) +transpose((((((transpose(transpose(transpose(X,-5) ,-7) ,-5) +transpose(shuffle(shuffle(((X|X) |step(X,12) ) ) ) ,4) ) +transpose(transpose((((X+transpose(X,-7) ) +transpose(echo((X|X) ,4,6) ,4) ) +transpose(arpeggio((arpeggio(X) +X) ) ,7) ) ,-5) ,7) ) +((echo(arpeggio(X) ,4,6) +transpose(arpeggio(step(echo(X,4,6) ,12) ) ,12) ) |(echo(X,4,6) +transpose(((((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ) +shuffle((transpose(echo(X,4,6) ,-5) +(echo(arpeggio((X+transpose(shuffle(X) ,7) ) ) ,4,6) +transpose(((transpose(transpose(X,-7) ,-7) +transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) ) ) ) +transpose(((echo(transpose((step(step((X+transpose(X,7) ) ,12) ,12) |(X|X) ) ,-5) ,4,6) +transpose(transpose(transpose((step(X,12) +arpeggio(step(echo(X,4,6) ,12) ) ) ,4) ,4) ,4) ) +transpose(((transpose((arpeggio((arpeggio(X) +transpose(arpeggio(X) ,4) ) ) +transpose((transpose(transpose(X,-5) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,-5) +transpose(echo((X+transpose(arpeggio(X) ,7) ) ,4,6) ,4) ) +transpose((echo(X,4,6) +transpose((transpose(transpose(X,-7) ,-5) |step(X,12) ) ,7) ) ,7) ) ,7) ) ,7) ) ,4) ) +transpose((transpose(transpose(((((shuffle(X) +shuffle(X) ) +transpose(arpeggio(transpose(shuffle((X|X) ) ,-5) ) ,7) ) +transpose(arpeggio(echo(step(X,12) ,4,6) ) ,4) ) +transpose(arpeggio(step(((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,7) ) ,-7) ,-5) +arpeggio(((transpose(((transpose(X,4) +transpose(transpose(X,4) ,7) ) +transpose((arpeggio(X) +transpose(X,7) ) ,7) ) ,-5) +transpose((((transpose(step(arpeggio(X) ,12) ,4) +transpose((echo(X,4,6) +transpose(transpose(shuffle(X) ,-5) ,12) ) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) +transpose(((X+transpose((X+transpose(X,7) ) ,7) ) +transpose((((X|X) |X) +transpose(transpose(X,-5) ,7) ) ,12) ) ,7) ) ,4) ) +transpose(shuffle(((((transpose(X,-5) +transpose(X,12) ) +((X+X) +step(X,12) ) ) +transpose(((transpose(X,4) +transpose(((step(X,12) +transpose(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) ,4) ) +transpose(shuffle((((X+X) +X) +transpose(X,12) ) ) ,7) ) ) ,7) ) ) ) ,7) ) ) ) +transpose(echo((step(((echo(transpose(step((step((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ,12) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,12) ,4) ,4,6) |(((echo(transpose(((X+transpose(step(X,12) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ,4) ,4,6) +transpose(echo(step((transpose(X,4) +X) ,12) ,4,6) ,4) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) +transpose(((shuffle(arpeggio(echo(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ,4,6) ) ) +transpose(transpose(((((step(X,12) |shuffle(X) ) +transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose((echo(X,4,6) |echo(X,4,6) ) ,4) ,7) ) ,-7) ,4) ) +transpose(shuffle(echo(((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ) ,7) ) ,7) ) ) +shuffle(arpeggio((echo(echo(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ,4,6) ,4,6) +transpose(transpose(transpose(((X+transpose(X,12) ) +shuffle(X) ) ,-7) ,4) ,7) ) ) ) ) ,12) +transpose((transpose(transpose((((arpeggio(((X|X) +shuffle(X) ) ) +transpose(shuffle(shuffle(X) ) ,12) ) +transpose((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose(((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,-7) ,7) ) ,4) ) +transpose(step(step(echo(transpose(X,4) ,4,6) ,12) ,12) ,7) ) ,-7) ,-7) +transpose((((((echo(step(transpose(transpose(X,-7) ,-7) ,12) ,4,6) +transpose((transpose((((X+transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,-5) +shuffle((arpeggio(X) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ) ) ,4) ) +transpose(((((shuffle(X) +transpose(((X+transpose(X,12) ) +(X+transpose(X,12) ) ) ,4) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,7) ) +transpose(transpose((arpeggio(step(X,12) ) +transpose((X+transpose(arpeggio(X) ,7) ) ,7) ) ,-7) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,7) ) +transpose(echo(((((shuffle(X) +transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) +transpose(shuffle(transpose(shuffle(X) ,-5) ) ,12) ) ,4,6) ,4) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((transpose(X,-5) +transpose(arpeggio(X) ,7) ) ,7) ) |echo((X+X) ,4,6) ) +((step(X,12) +transpose((step((X+transpose(X,12) ) ,12) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,7) ) +transpose((transpose(X,4) +transpose((X|X) ,7) ) ,7) ) ) ,7) ) +transpose(transpose(shuffle((arpeggio(((echo(echo(X,4,6) ,4,6) +transpose(transpose(X,-5) ,7) ) +step(shuffle(X) ,12) ) ) +transpose(arpeggio(arpeggio(step(step(X,12) ,12) ) ) ,12) ) ) ,4) ,12) ) ,7) ) ,7) ) ,4,6) ,-5) ) ) +((echo((transpose((((transpose(shuffle(transpose(shuffle((arpeggio(echo(arpeggio(X) ,4,6) ) +transpose(X,7) ) ) ,-5) ) ,-7) +(transpose(step(((echo(step((X+transpose(echo(X,4,6) ,7) ) ,12) ,4,6) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose((((X+shuffle(X) ) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose((X|X) ,7) ) ,-7) ,7) ) ,12) ,4) +(((arpeggio(step((X+X) ,12) ) +transpose(arpeggio(transpose((X|X) ,4) ) ,4) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ,7) ) +step(X,12) ) ) ) +(((transpose(transpose(step(shuffle(transpose(X,4) ) ,12) ,-7) ,4) +transpose(echo(arpeggio(((((transpose(X,-7) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose(X,7) ) +transpose((X+shuffle(X) ) ,4) ) +transpose((((X|X) |X) +transpose(echo(X,4,6) ,7) ) ,7) ) ) ,4,6) ,7) ) |arpeggio(step(step(X,12) ,12) ) ) +(echo(((echo(arpeggio(transpose(X,4) ) ,4,6) +transpose(X,4) ) +transpose((arpeggio((X+transpose(X,7) ) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,7) ) ,4,6) +((echo(X,4,6) +transpose(arpeggio(shuffle(echo((step(X,12) +transpose(transpose(X,-5) ,7) ) ,4,6) ) ) ,4) ) +transpose(arpeggio(transpose(step(X,12) ,-7) ) ,7) ) ) ) ) +echo(shuffle((((transpose((X+X) ,-7) +((X|X) +transpose(X,7) ) ) |(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) |((arpeggio(X) +transpose((X+transpose(shuffle(X) ,7) ) ,4) ) +transpose(X,7) ) ) ) +(shuffle((echo(X,4,6) +transpose(X,7) ) ) +transpose(transpose(((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ,4) ,7) ) ) ) ,4,6) ) ,-5) |(step(((transpose(arpeggio(step(step(step(X,12) ,12) ,12) ) ,-5) +transpose(echo(((((arpeggio((X+transpose(X,7) ) ) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) |X) +transpose((echo(X,4,6) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,12) ) ,4,6) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,12) |step(shuffle(step(((transpose(X,-5) +transpose((X|X) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,12) ) ) ,4,6) +transpose(arpeggio(echo(shuffle(transpose(transpose(transpose((((step(transpose(X,4) ,12) +transpose(arpeggio(((shuffle(X) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) +transpose((shuffle((X+transpose(X,12) ) ) |X) ,7) ) ) ,4) ) +transpose((echo((echo(echo(X,4,6) ,4,6) |transpose((X+X) ,4) ) ,4,6) |((step(X,12) +transpose(transpose(transpose(arpeggio(X) ,4) ,4) ,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +echo(X,4,6) ) ,7) ) ) ,7) ) |echo(transpose(transpose(X,-5) ,-5) ,4,6) ) ,4) ,-5) ,4) ) ,4,6) ) ,12) ) +transpose((transpose(transpose(((step(step(shuffle(((X+transpose((arpeggio(transpose(X,4) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,12) ,12) +transpose(((step(arpeggio(transpose(X,-7) ) ,12) +transpose((echo(((X+transpose(shuffle(X) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +X) +transpose(step(transpose(transpose((X+transpose(X,7) ) ,4) ,-5) ,12) ,4) ) +transpose(X,7) ) ,7) ) ,12) ) +transpose(transpose(echo(((echo(shuffle(echo(transpose(X,4) ,4,6) ) ,4,6) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose(((transpose((step(X,12) +transpose(X,-5) ) ,4) +transpose((X+transpose(shuffle((X+X) ) ,12) ) ,4) ) +transpose((step(step(X,12) ,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,7) ) ,4,6) ,-7) ,7) ) ,4) ) +transpose((shuffle(transpose(X,4) ) +(((((X|X) |X) |shuffle(((X+X) +transpose(arpeggio(X) ,7) ) ) ) +transpose(step(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ,12) ) +transpose(((((transpose((((shuffle(X) +transpose(transpose(X,-7) ,7) ) +transpose((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ,-5) |echo(transpose(X,4) ,4,6) ) +transpose((transpose((step(X,12) |transpose(X,-7) ) ,-5) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose(((X+transpose(arpeggio((echo(X,4,6) +transpose(((X+X) +transpose(X,7) ) ,7) ) ) ,4) ) +transpose(step((X+transpose(transpose(X,-5) ,7) ) ,12) ,7) ) ,7) ) +((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(shuffle(((echo(X,4,6) +transpose(arpeggio(X) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ) ,4) ) +transpose((echo(((transpose(X,4) +transpose(transpose(X,-5) ,7) ) |transpose(transpose(X,4) ,-7) ) ,4,6) +shuffle(((X|X) +transpose(((X|X) +(X|X) ) ,12) ) ) ) ,7) ) ) ,7) ) ) ,7) ) ,-5) ,4) +transpose((shuffle(step(((((arpeggio(X) +transpose(transpose((transpose(X,4) |transpose(X,4) ) ,-5) ,12) ) +transpose(echo(transpose(transpose(step(X,12) ,-5) ,4) ,4,6) ,4) ) +transpose(transpose(echo(transpose(X,4) ,4,6) ,4) ,7) ) +(step(transpose(step((X+transpose(X,7) ) ,12) ,-5) ,12) +transpose(arpeggio(((transpose(transpose(X,4) ,4) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(shuffle(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-5) ) ,7) ) ) ,7) ) ) ,12) ) +transpose(arpeggio(transpose((((((echo((transpose(echo((X+transpose(shuffle(transpose(X,4) ) ,7) ) ,4,6) ,-7) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,4,6) +transpose(((transpose(X,4) +transpose((arpeggio(arpeggio(echo(X,4,6) ) ) +X) ,7) ) +transpose(X,-5) ) ,4) ) +transpose(arpeggio(((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) |((echo(X,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ) +transpose((transpose(X,4) |echo(echo(X,4,6) ,4,6) ) ,7) ) ) ,7) ) |(transpose((echo(echo(X,4,6) ,4,6) +echo(echo(X,4,6) ,4,6) ) ,-7) +transpose((transpose(echo(X,4,6) ,-5) +transpose(shuffle((echo(shuffle(X) ,4,6) +arpeggio(transpose(X,-7) ) ) ) ,7) ) ,7) ) ) +transpose(transpose(transpose(shuffle(transpose(X,-5) ) ,4) ,-7) ,4) ) +transpose(((step(transpose(echo(echo(echo(step(X,12) ,4,6) ,4,6) ,4,6) ,-7) ,12) |transpose(transpose(shuffle((X|transpose(X,-5) ) ) ,-7) ,-5) ) +transpose(shuffle(echo(transpose(((arpeggio(transpose(transpose(X,-5) ,4) ) +transpose(((transpose(X,-5) |(X+(X|X) ) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ,4) ) +transpose(transpose(arpeggio(transpose(X,-5) ) ,4) ,7) ) ,4) ,4,6) ) ,7) ) ,7) ) ,4) ) ,7) ) ,7) ) ,12) ) ) )
random seed used was 99336077

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