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:
((((transpose((echo((echo((((transpose((X|X) ,-7) +transpose(transpose(((X+step(X,12) ) |(X+X) ) ,-5) ,4) ) +transpose(((X+transpose(((X+transpose(X,7) ) +X) ,7) ) +transpose(transpose(X,4) ,12) ) ,7) ) +transpose(transpose(transpose((transpose(transpose(X,-7) ,-7) +step(shuffle(X) ,12) ) ,-7) ,4) ,12) ) ,4,6) |transpose(step(step((step(X,12) |transpose(X,-7) ) ,12) ,12) ,-7) ) ,4,6) |transpose((shuffle((step(transpose(X,4) ,12) |(transpose(X,4) |transpose(transpose(X,4) ,-5) ) ) ) +((((((shuffle((X+X) ) +transpose(X,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) +transpose(transpose(X,-7) ,7) ) +transpose(arpeggio(shuffle(transpose(X,-5) ) ) ,4) ) +transpose(((shuffle(echo(transpose(X,4) ,4,6) ) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose((transpose((X+transpose(X,12) ) ,-5) +transpose(step(X,12) ,12) ) ,7) ) ,7) ) ) ,-7) ) ,-5) +transpose((((echo(arpeggio((transpose(transpose(X,-7) ,-5) +(((transpose(step(X,12) ,4) +transpose(((X+transpose(X,12) ) |echo(X,4,6) ) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) |(((X+transpose(X,12) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ) ) ) ,4,6) +transpose(transpose(transpose(transpose(echo((X|echo(X,4,6) ) ,4,6) ,-5) ,4) ,4) ,4) ) +transpose(((echo((X+X) ,4,6) +shuffle((step(transpose(transpose(X,-7) ,4) ,12) +arpeggio(arpeggio(X) ) ) ) ) +transpose(((X+transpose(X,-7) ) +transpose(((step(X,12) |(X+transpose(X,12) ) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ,12) ) ,7) ) ,7) ) +(transpose(transpose(((((((transpose((transpose(X,-5) +X) ,-5) +step(arpeggio(X) ,12) ) +transpose((transpose(transpose((X+echo(X,4,6) ) ,4) ,4) +transpose((((((X|X) +transpose(shuffle(X) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose((transpose(X,-7) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(step((transpose(transpose(X,-5) ,-5) +transpose(echo(X,4,6) ,7) ) ,12) ,-7) ,7) ) +transpose(shuffle((((((X|X) +transpose(transpose(X,-7) ,4) ) +transpose(step(X,12) ,7) ) +transpose(X,12) ) +((X|X) +transpose(X,7) ) ) ) ,4) ) +transpose((((transpose((echo(X,4,6) |X) ,-5) +transpose(((arpeggio(X) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) |echo(transpose(transpose((X|X) ,4) ,-5) ,4,6) ) ,7) ) +transpose((transpose(X,-7) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,12) ) +transpose((arpeggio(X) |transpose(X,-7) ) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) +transpose((transpose(X,-7) +X) ,7) ) ,7) ) +transpose(arpeggio(((transpose(X,4) +transpose((X+(X+transpose(X,12) ) ) ,4) ) +transpose((X|(X|X) ) ,7) ) ) ,7) ) ,7) ) ,7) ) ,4) ,-5) +(transpose((shuffle(((step((X+transpose(X,7) ) ,12) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4) ) +transpose((((X+transpose((X|X) ,7) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) +transpose((((step((transpose(X,-7) |transpose(transpose(X,4) ,-5) ) ,12) +(echo(transpose(X,4) ,4,6) +transpose(transpose((step(transpose(X,4) ,12) +transpose(X,12) ) ,-5) ,12) ) ) +transpose(echo(transpose(transpose(shuffle(X) ,4) ,4) ,4,6) ,7) ) +step((X+transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ) ,12) ) ,12) ) ,-7) +arpeggio(transpose(((((step(transpose(transpose(X,4) ,4) ,12) +echo((X+transpose(X,12) ) ,4,6) ) +transpose((transpose(arpeggio(arpeggio(X) ) ,-7) +transpose(step(step((X|X) ,12) ,12) ,12) ) ,4) ) +transpose((arpeggio((transpose((X|X) ,-7) +X) ) +transpose((transpose((X|X) ,-5) +transpose(shuffle((X+transpose(transpose(X,-5) ,12) ) ) ,12) ) ,7) ) ,7) ) |shuffle(transpose(echo((step(X,12) +transpose(transpose(shuffle(X) ,4) ,7) ) ,4,6) ,4) ) ) ,4) ) ) ) ) ,4) ) +transpose(arpeggio(transpose(transpose(((step((((step(X,12) +transpose(X,4) ) +transpose(X,7) ) +X) ,12) +transpose(((X|(X+X) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,4) ) +transpose(step(X,12) ,7) ) ,-5) ,4) ) ,7) ) +transpose(transpose((((((transpose((transpose((step(X,12) |transpose(X,4) ) ,4) |shuffle(shuffle(X) ) ) ,4) |step((((transpose(X,4) +transpose((echo(step(X,12) ,4,6) +(X+transpose(((X+X) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) ) ,4) ) +transpose(transpose((transpose(X,-7) +transpose((transpose(X,-7) |X) ,7) ) ,4) ,7) ) +(transpose(X,4) |((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |(step((X+X) ,12) |(transpose(X,4) +transpose(transpose(X,-5) ,12) ) ) ) +transpose(step(X,12) ,-7) ) ) ) ,12) ) |(transpose(((X|X) +transpose((transpose(X,4) |X) ,12) ) ,-7) +transpose(shuffle((((arpeggio((shuffle(X) |transpose(X,-5) ) ) +transpose(((((((X|X) +X) +transpose(arpeggio((X|X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,7) ) ,7) ) +transpose(arpeggio((transpose(arpeggio(X) ,-7) |X) ) ,7) ) +step(step((step(((echo(X,4,6) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(X,4) ) ,7) ) ,12) +transpose(((X+transpose((X|X) ,12) ) |transpose(X,-7) ) ,7) ) ,12) ,12) ) ) ,-7) ) ) +transpose((transpose(transpose((((X+transpose(X,7) ) |(X|(X+X) ) ) +transpose(((echo((X+transpose(X,7) ) ,4,6) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(X,7) ) ,12) ) ,-7) ,-7) +transpose(transpose((((transpose(shuffle(step(arpeggio((X+(X+echo(X,4,6) ) ) ) ,12) ) ,-5) +transpose(((arpeggio(transpose(((X|X) |((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ) ,-5) ) +transpose((arpeggio((X|X) ) |transpose(transpose(X,-5) ,4) ) ,-5) ) +transpose(((transpose(X,-5) +transpose((step(((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,12) +((X|X) +X) ) ,4) ) +transpose(arpeggio(transpose(echo(X,4,6) ,-7) ) ,7) ) ,7) ) ,4) ) +transpose((((step(echo((X|X) ,4,6) ,12) +transpose((X|((transpose(X,4) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,12) ) +shuffle(shuffle(shuffle(X) ) ) ) +(echo((((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(shuffle(shuffle(X) ) ,4) ) +transpose((((X+X) +transpose(X,4) ) +transpose((X+X) ,7) ) ,7) ) ,4,6) +transpose((transpose(step(X,12) ,-5) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,12) ) ) ,7) ) +(((arpeggio(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) ) +transpose(shuffle(step(transpose(X,4) ,12) ) ,4) ) +transpose(((transpose(transpose(transpose(X,-5) ,-7) ,-5) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,4) ,12) ) ,7) ) |((((X|(X+transpose(X,7) ) ) +shuffle(transpose(X,-7) ) ) +transpose(((((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) +transpose(((transpose(transpose(X,-7) ,-7) +transpose(transpose(X,4) ,-7) ) +transpose(arpeggio((X+X) ) ,7) ) ,4) ) +transpose((transpose((X+transpose(X,4) ) ,4) +step((transpose(X,-7) +(X+transpose(X,12) ) ) ,12) ) ,7) ) ,4) ) +transpose(transpose(shuffle(transpose((((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) ) ,-7) ,7) ) ) ) ,4) ,12) ) ,4) ) +transpose(arpeggio(step(((transpose(((arpeggio((X+X) ) +arpeggio(X) ) +transpose(X,-5) ) ,4) +transpose((transpose((X+X) ,-5) +transpose(transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,-5) ) ,4) ) +transpose(transpose(echo((shuffle(transpose(transpose(X,-5) ,-7) ) +(X|transpose((X|X) ,4) ) ) ,4,6) ,-7) ,7) ) ,12) ) ,7) ) +echo((transpose((transpose(echo(((X+(X+transpose(X,7) ) ) +transpose(X,-5) ) ,4,6) ,-5) |((((((X+X) +X) +transpose(transpose(X,4) ,12) ) +(X+transpose(X,12) ) ) +transpose(shuffle(((transpose(transpose((X+transpose(X,12) ) ,4) ,4) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,4) ) +transpose(transpose((transpose(transpose(X,-5) ,-7) |(X+X) ) ,-7) ,7) ) ) ,-7) +transpose(transpose(((X+(transpose(X,-7) +transpose((X+X) ,12) ) ) +step(echo(transpose(step(X,12) ,-7) ,4,6) ,12) ) ,4) ,4) ) ,4,6) ) ,4) ,12) ) +transpose(arpeggio(arpeggio(arpeggio((arpeggio((transpose(transpose(((transpose(transpose(shuffle(((X+transpose(X,12) ) +transpose(X,12) ) ) ,4) ,4) +(arpeggio(((step((transpose(X,4) |(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,12) +transpose(transpose(X,4) ,12) ) +echo(echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) ,4,6) ) ) +(transpose(echo((X+transpose(X,7) ) ,4,6) ,4) +transpose(((step(((X+transpose(X,12) ) +transpose(X,-5) ) ,12) |transpose(X,4) ) +(transpose((X+transpose(X,12) ) ,-7) +transpose(transpose(X,-7) ,12) ) ) ,7) ) ) ) +transpose((((transpose((transpose(step(X,12) ,4) |transpose(transpose(X,-7) ,-7) ) ,4) +transpose((transpose(arpeggio(((transpose(X,-5) +(X+X) ) +step(transpose(X,4) ,12) ) ) ,4) +transpose(((transpose(((X+X) +(shuffle(X) +arpeggio(X) ) ) ,-5) |((X|echo(X,4,6) ) +shuffle(transpose(X,-5) ) ) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(transpose((transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) ,4) +(arpeggio((((X+transpose(X,12) ) |(X+transpose(X,7) ) ) +arpeggio(X) ) ) +shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |step(X,12) ) ) ) ) ,4) ,7) ) |echo((transpose((((transpose(transpose(X,-7) ,-5) +transpose(X,7) ) +transpose((transpose((X|X) ,-5) |transpose(X,-7) ) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,-5) +(shuffle(shuffle((X+X) ) ) |(transpose(transpose(X,-7) ,4) +transpose((transpose(shuffle(transpose(X,-5) ) ,4) +transpose(step(X,12) ,7) ) ,12) ) ) ) ,4,6) ) ,12) ) ,-7) ,-7) +transpose(((((((transpose((X+X) ,4) +transpose(((shuffle(X) +echo(X,4,6) ) +transpose(shuffle(transpose((X+X) ,-7) ) ,7) ) ,4) ) +transpose(((step((step(X,12) +transpose(X,-5) ) ,12) +transpose(transpose(arpeggio((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) ) ,4) ,4) ) +transpose((((transpose(X,4) |transpose(X,4) ) |X) |((X+X) +transpose(X,12) ) ) ,7) ) ,7) ) +transpose(transpose(X,-5) ,12) ) |(transpose(transpose((transpose(X,4) +transpose(transpose(X,-5) ,7) ) ,-5) ,-5) +transpose(((step(transpose((echo(X,4,6) |X) ,4) ,12) +transpose((((arpeggio(X) +echo((X|X) ,4,6) ) +transpose((((X|X) +((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(shuffle(arpeggio(shuffle(X) ) ) ,12) ) ,4) ) +transpose((transpose((step(X,12) |X) ,-5) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ,7) ) ,4) ) +transpose(transpose(transpose((X+transpose(echo(X,4,6) ,12) ) ,-5) ,-7) ,7) ) ,7) ) ) +transpose(((echo(X,4,6) |(transpose(X,-5) +transpose(X,7) ) ) +transpose(transpose(X,4) ,-5) ) ,-7) ) |((((transpose(transpose(((X+transpose(X,12) ) |arpeggio(X) ) ,-5) ,4) |(transpose((((X+X) |X) +((X|X) +(X|X) ) ) ,-5) |echo((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) ,4,6) ) ) +transpose(echo(((shuffle(step(step(X,12) ,12) ) +transpose(((transpose(step(arpeggio(X) ,12) ,4) +transpose(shuffle((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ) ,4) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,-7) ,7) ) ,7) ) |step(step(transpose((X+X) ,-7) ,12) ,12) ) ,4,6) ,4) ) +transpose(((((shuffle((X+transpose(X,12) ) ) +transpose((X+X) ,7) ) |arpeggio((transpose(X,-5) +X) ) ) +transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(echo((X|X) ,4,6) ,12) ) ,7) ) +(((transpose(transpose(X,-7) ,-5) |X) +arpeggio(X) ) |(transpose(X,-7) +(X|(X|(X+X) ) ) ) ) ) ,7) ) |(transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose(transpose(((X|X) +transpose((transpose(X,-5) |step(X,12) ) ,7) ) ,-5) ,7) ) ) ) ,7) ) ) +transpose((((transpose(transpose(transpose(transpose(transpose((X|X) ,4) ,4) ,-7) ,4) ,4) +transpose((transpose((transpose((((((X|X) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(X,7) ) +transpose(shuffle(((X+transpose(X,7) ) |X) ) ,4) ) +transpose((X+X) ,7) ) ,-7) |((echo((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) +step((X+transpose(X,7) ) ,12) ) +transpose(arpeggio((((X+transpose(X,12) ) |echo(X,4,6) ) +(((shuffle(X) +transpose((X|X) ,4) ) +transpose(X,7) ) +echo(X,4,6) ) ) ) ,7) ) ) ,4) |step(transpose((((transpose(X,4) |shuffle(X) ) |(X|transpose(X,4) ) ) |transpose(step(X,12) ,4) ) ,4) ,12) ) ,12) ) +transpose((step(transpose(arpeggio(((transpose(transpose(X,-7) ,4) +transpose(X,12) ) +shuffle(transpose((X+X) ,4) ) ) ) ,4) ,12) |transpose(((step(transpose(transpose(transpose(transpose(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,4) ,4) ,-7) ,-5) ,-5) ,12) +transpose((step(transpose(transpose((X+(X+X) ) ,-7) ,-7) ,12) +transpose(transpose(((echo((X+X) ,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,12) ) +shuffle(arpeggio(transpose(shuffle(X) ,-7) ) ) ) ,4) ,12) ) ,12) ) +transpose(((transpose(transpose((echo((echo(X,4,6) |echo(X,4,6) ) ,4,6) |transpose(shuffle(X) ,-5) ) ,-7) ,-5) +transpose(transpose(((((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) +(X+transpose(X,12) ) ) ,-7) ,4) ) +transpose((shuffle(((echo(transpose(X,-7) ,4,6) |(transpose(X,-7) |X) ) |echo(arpeggio((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,4,6) ) ) |(((transpose(X,4) |transpose((X+transpose(X,12) ) ,-7) ) |(transpose(X,-7) +transpose(shuffle(X) ,4) ) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) ) ,7) ) ,12) ) ,-7) ) ,12) ) |transpose(echo(transpose((transpose(transpose((transpose(transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,4) +transpose(shuffle(X) ,7) ) ,4) ,4) +(transpose(echo((step(echo(X,4,6) ,12) +transpose((transpose(shuffle(X) ,-7) +echo(transpose(echo(X,4,6) ,-7) ,4,6) ) ,12) ) ,4,6) ,4) +transpose(((step((arpeggio(X) +transpose(X,7) ) ,12) +transpose(((step(X,12) +transpose(arpeggio(echo(X,4,6) ) ,12) ) |transpose(transpose(echo(X,4,6) ,-7) ,-7) ) ,12) ) +transpose(echo(transpose((((transpose(X,-7) +transpose(echo(X,4,6) ,7) ) +transpose((X|X) ,12) ) +((echo(transpose(X,-7) ,4,6) +transpose(arpeggio(shuffle(X) ) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ) ,4) ,4,6) ,7) ) ,12) ) ) ,-7) ,4,6) ,-5) ) ,7) ) ) ) ) ,12) )
random seed used was 239870896

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