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:
((((transpose(step((transpose(transpose(transpose(((transpose((transpose((X+X) ,-5) +step(echo(X,4,6) ,12) ) ,-7) +transpose(shuffle(transpose(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) ,-5) ) ,12) ) +transpose(arpeggio((((shuffle(X) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ) ,12) ) ,-7) ,4) ,-5) +step((((arpeggio(transpose(transpose(transpose(X,-5) ,-5) ,-7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) |shuffle((((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +transpose(X,4) ) ) ) |transpose((((arpeggio(arpeggio(X) ) +transpose(shuffle(((X+transpose(X,7) ) |X) ) ,4) ) +transpose((step((X+X) ,12) +echo(transpose(transpose(X,-5) ,-5) ,4,6) ) ,7) ) +transpose(transpose(transpose((transpose(arpeggio(X) ,-5) +transpose(X,7) ) ,-7) ,-7) ,12) ) ,-7) ) ,12) ) ,12) ,4) +transpose(transpose(((transpose(transpose((((arpeggio(X) |X) |transpose((X|X) ,4) ) |step((((X+step(X,12) ) |shuffle((X|X) ) ) |(arpeggio(X) +echo(X,4,6) ) ) ,12) ) ,-5) ,4) +transpose((((arpeggio(step(step(transpose((transpose(X,-5) +transpose(arpeggio((((X+transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) ) ,7) ) ,-7) ,12) ,12) ) +step(echo(echo(echo(X,4,6) ,4,6) ,4,6) ,12) ) +transpose(transpose(transpose((transpose(step(transpose(X,-5) ,12) ,-7) +transpose((transpose(transpose(X,4) ,-5) +shuffle(transpose(X,-7) ) ) ,12) ) ,-7) ,4) ,4) ) +transpose(transpose(shuffle((transpose(arpeggio(transpose(((X+transpose(X,12) ) |X) ,-5) ) ,4) +transpose((transpose((X+transpose(X,12) ) ,-7) |((X+X) |X) ) ,12) ) ) ,-7) ,7) ) ,4) ) +(echo(transpose(echo((((X|X) |transpose((X+X) ,4) ) +(transpose(X,-7) +transpose((transpose(X,-5) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,12) ) ) ,4,6) ,-5) ,4,6) +transpose((echo(transpose(arpeggio((step(((X+transpose(transpose(X,4) ,12) ) |((X+X) |(X|X) ) ) ,12) +transpose(transpose(transpose(((X+transpose((X+X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,-5) ,7) ) ) ,-7) ,4,6) +((echo(step(shuffle(((((transpose(X,-5) +transpose((transpose(transpose(X,4) ,-7) |transpose(transpose(X,4) ,-5) ) ,12) ) +transpose(transpose((X+transpose((X+X) ,12) ) ,-5) ,12) ) +transpose(shuffle((echo(transpose((X+transpose(X,12) ) ,4) ,4,6) +transpose((arpeggio(X) +X) ,7) ) ) ,4) ) +transpose((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) +transpose(echo((echo(X,4,6) |step(X,12) ) ,4,6) ,12) ) ,7) ) ) ,12) ,4,6) +transpose(transpose((step(echo(X,4,6) ,12) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |((X+X) |(X|X) ) ) +transpose(transpose((X+echo(transpose(X,4) ,4,6) ) ,4) ,12) ) ,12) ) ,-7) ,4) ) +transpose(transpose(transpose(arpeggio(transpose(transpose((X+X) ,4) ,-5) ) ,-5) ,-5) ,7) ) ) ,7) ) ) ,4) ,4) ) +transpose(shuffle(step((transpose((((arpeggio(echo(X,4,6) ) +transpose(transpose((arpeggio((X+transpose(X,12) ) ) +transpose((X+X) ,7) ) ,-7) ,12) ) +transpose((((X|transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,-5) ,12) ) +((((X|X) +transpose(shuffle(X) ,12) ) +step(X,12) ) +transpose(echo(X,4,6) ,12) ) ) ,-7) ) +((step(step(transpose(X,-7) ,12) ,12) +transpose(transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) ,-5) ,4) ) +transpose(shuffle(step(((arpeggio(X) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,7) ) ) ,4) +((((transpose(((shuffle((step(X,12) +transpose(((X+transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ) +transpose(shuffle((X|X) ) ,4) ) +transpose((transpose((X|X) ,4) +transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) ,-7) ) ,7) ) ,-5) +transpose(((arpeggio(transpose(transpose(echo(X,4,6) ,-5) ,4) ) |step((((transpose(X,-7) +transpose(step(arpeggio(X) ,12) ,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-7) ,12) ) ,12) ) +transpose((((transpose(X,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(((X|X) +transpose((X|X) ,12) ) ,-5) ,7) ) ,7) ) ,4) ) +transpose((echo(transpose((transpose(X,-5) +transpose(X,12) ) ,4) ,4,6) +shuffle((((X+X) |X) +transpose(transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ,7) ) ) ) ,7) ) |transpose(((transpose(X,-7) |shuffle(transpose(transpose(X,-7) ,4) ) ) |((X|X) +transpose((((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(((X+transpose(X,12) ) +transpose((X|X) ,12) ) ) ,7) ) ,12) ) ) ,4) ) +transpose(transpose((echo(((shuffle(((X|X) +transpose(transpose(X,-7) ,7) ) ) +transpose((X+transpose(((step(X,12) +transpose((X|X) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,4) ) +transpose(step(transpose((((arpeggio(transpose(X,-7) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose((shuffle(X) +((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) ,7) ) ,4) ,12) ,7) ) ,4,6) +transpose(step(arpeggio(transpose(((((arpeggio(X) |(X+transpose(X,12) ) ) +transpose(shuffle(X) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) |transpose(transpose(X,4) ,-7) ) ,4) ) ,12) ,12) ) ,4) ,12) ) ) ,12) ) ,7) ) +transpose(arpeggio(transpose(((transpose(shuffle(((step((transpose(X,-5) +transpose(X,-7) ) ,12) +transpose(transpose((step((X+X) ,12) |transpose(X,-5) ) ,4) ,7) ) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((transpose(X,-5) +transpose((X|X) ,7) ) ,12) ) |transpose(step(X,12) ,4) ) ,7) ) ) ,-5) +transpose((transpose((transpose(transpose(X,-7) ,-5) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,-7) |transpose((echo((transpose(echo(X,4,6) ,-5) +transpose(X,-7) ) ,4,6) |(X+transpose(echo(X,4,6) ,7) ) ) ,4) ) ,4) ) |echo(shuffle((echo(X,4,6) +transpose(X,4) ) ) ,4,6) ) ,-5) ) ,7) ) +transpose((((echo(((((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,12) ) ) |(transpose(transpose(X,-5) ,-7) +step(((echo((X+transpose(X,12) ) ,4,6) +transpose(((X|X) +(X+transpose(X,12) ) ) ,7) ) +transpose((transpose(transpose(X,-5) ,-7) +(arpeggio(X) +transpose(X,12) ) ) ,7) ) ,12) ) ) +(((transpose(shuffle((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) ) ,-7) +transpose(transpose((transpose(X,-7) +(X|arpeggio(transpose(X,-5) ) ) ) ,4) ,4) ) +transpose(transpose((((X|X) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,7) ) ,-5) ,7) ) +transpose(transpose(((transpose(transpose((X+X) ,-7) ,4) +transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +((X|X) +X) ) +arpeggio((X+X) ) ) ,-7) ,7) ) ,-5) ,7) ) ) +transpose(transpose(((echo(transpose((transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,-7) ,4) ,4) +echo((X|X) ,4,6) ) ,4) ,4,6) +transpose((transpose(echo(transpose(((echo((X+X) ,4,6) +(transpose(X,-5) |transpose(X,-7) ) ) +transpose((((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ,7) ) ,4) ,4,6) ,-7) +transpose(transpose(shuffle(transpose(arpeggio(arpeggio(X) ) ,4) ) ,4) ,7) ) ,4) ) +transpose(arpeggio(echo(((step(X,12) +transpose(((X+transpose(X,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ,12) ) +transpose(transpose((echo(X,4,6) +transpose(X,12) ) ,-7) ,7) ) ,4,6) ) ,7) ) ,-7) ,12) ) ,4,6) +transpose(transpose(((shuffle((echo((arpeggio((shuffle(transpose((X+transpose(X,7) ) ,-7) ) |(X+transpose((transpose(X,-5) |(X|X) ) ,12) ) ) ) |((shuffle(step(X,12) ) +transpose((((transpose(X,-5) +transpose(arpeggio(arpeggio(X) ) ,12) ) +transpose((((X+transpose(X,12) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) +arpeggio(transpose(shuffle(X) ,-5) ) ) ,4) ) +transpose(transpose(((((((X+X) +transpose(step(X,12) ,4) ) +transpose(step(X,12) ,7) ) +transpose(echo(X,4,6) ,7) ) +transpose(step(X,12) ,4) ) +transpose(((transpose(X,-5) |(X+X) ) +transpose(((X+X) |X) ,12) ) ,7) ) ,4) ,7) ) ) ,4,6) +transpose(((echo(((step(X,12) +arpeggio(X) ) |transpose(X,4) ) ,4,6) +transpose(step(echo(transpose((transpose(X,4) +transpose(transpose(X,-5) ,7) ) ,-5) ,4,6) ,12) ,4) ) +transpose(arpeggio(((echo(((X+transpose(X,12) ) |(transpose(X,-5) +transpose(X,7) ) ) ,4,6) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) +transpose(((transpose(((echo(X,4,6) +transpose(X,-7) ) |transpose(X,-7) ) ,-7) +transpose((shuffle(X) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ) ,7) ) ,12) ) ) +transpose((((transpose(transpose(step(X,12) ,4) ,-5) +transpose(transpose(transpose((transpose(X,-5) |transpose(X,4) ) ,-5) ,-7) ,12) ) +transpose(step(transpose((arpeggio(echo(X,4,6) ) +arpeggio(X) ) ,-5) ,12) ,7) ) +transpose((echo(transpose(transpose(X,-5) ,4) ,4,6) |(echo(transpose(X,4) ,4,6) |echo(transpose((transpose(arpeggio(X) ,4) +transpose(((shuffle(X) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ) ,-7) ,4,6) ) ) ,-7) ) ,4) ) +transpose(transpose((step((((transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) +((step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(X,7) ) ,12) +transpose(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ) +transpose((((X+X) |X) +transpose(transpose(transpose(arpeggio(X) ,-5) ,-5) ,12) ) ,4) ) +transpose(transpose(echo((shuffle(X) |transpose((X+transpose(X,12) ) ,-7) ) ,4,6) ,-5) ,7) ) ,12) +((((X+X) +transpose(((X+transpose(X,7) ) |transpose(transpose(X,-7) ,4) ) ,12) ) +transpose(transpose(transpose(X,4) ,-7) ,-7) ) +shuffle(((((((transpose(X,-5) +transpose((X+X) ,12) ) +transpose((arpeggio(X) +arpeggio(arpeggio(X) ) ) ,4) ) +transpose(X,7) ) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose((X+echo((X+transpose(X,7) ) ,4,6) ) ,7) ) +transpose(arpeggio(transpose(transpose(arpeggio(transpose(X,4) ) ,-5) ,-7) ) ,12) ) ) ) ) ,-7) ,7) ) ,-5) ,4) ) +transpose((echo(transpose(shuffle(transpose((transpose(transpose(transpose((transpose(echo((X+X) ,4,6) ,-7) +arpeggio(shuffle(X) ) ) ,-5) ,4) ,-5) |(echo(shuffle(((echo(X,4,6) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(((X+X) +transpose(transpose(X,4) ,7) ) ,4) ,7) ) ) ,4,6) +transpose((step(transpose((transpose((X+X) ,-7) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,4) ,12) +transpose((X+transpose(shuffle(transpose(X,4) ) ,7) ) ,4) ) ,12) ) ) ,-7) ) ,-7) ,4,6) +(transpose(transpose(echo(echo(((((((step((X|X) ,12) +transpose((transpose(X,-7) |(X+X) ) ,4) ) +(transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ) +((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) |(X+transpose(X,12) ) ) +transpose(((X+X) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,7) ) ) |(step((X+X) ,12) +(transpose(X,-5) +transpose(X,-5) ) ) ) |(transpose(((((X+X) |X) |transpose((X+transpose(transpose(X,4) ,7) ) ,4) ) +transpose(((shuffle(arpeggio(X) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,7) ) ,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,4) +transpose((((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(step(shuffle((X+transpose(transpose(X,4) ,12) ) ) ,12) ,4) ) +transpose(transpose((transpose((X|X) ,-5) |arpeggio((X+X) ) ) ,-5) ,7) ) ,7) ) ) +transpose((step(((((X+transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +((echo((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) +transpose(transpose(transpose(transpose(X,4) ,4) ,-5) ,4) ) +transpose(shuffle(X) ,7) ) ) +(transpose((X|X) ,-7) +transpose(arpeggio(((echo(X,4,6) +transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) ) ,12) +transpose(transpose(transpose(((step(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,-7) ,12) +transpose(transpose(((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) ,-5) ,7) ) ,12) ) ,4,6) ,4,6) ,4) ,4) |(transpose(transpose(transpose(transpose((((((transpose(((X+transpose(transpose(X,4) ,4) ) +transpose((transpose(X,-5) |X) ,7) ) ,-5) |(arpeggio(transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose((echo((((X|X) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) |(X|X) ) ,4) ) +transpose(step(echo((X|X) ,4,6) ,12) ,7) ) +transpose(transpose((echo((arpeggio((X+transpose(X,12) ) ) +transpose(X,12) ) ,4,6) +transpose((X|shuffle(X) ) ,12) ) ,-7) ,4) ) +transpose(step((echo(X,4,6) |((transpose(X,-5) +transpose(echo(X,4,6) ,7) ) +transpose(echo(transpose((X+X) ,-7) ,4,6) ,12) ) ) ,12) ,7) ) ,4) ,4) ,4) ,4) +transpose(arpeggio((arpeggio((((transpose((X+transpose(X,12) ) ,-5) +((echo(transpose(transpose(transpose(X,4) ,-5) ,-5) ,4,6) |(transpose((transpose(X,-5) +transpose((X|X) ,7) ) ,-7) |transpose(transpose(X,4) ,-7) ) ) +(transpose(echo((X+(X+transpose(X,7) ) ) ,4,6) ,4) +arpeggio((X+transpose(X,7) ) ) ) ) ) +transpose(arpeggio(arpeggio(shuffle((transpose(step(arpeggio((X|X) ) ,12) ,-5) |transpose(X,4) ) ) ) ) ,4) ) +transpose((((((transpose((echo(transpose(X,4) ,4,6) +(X+X) ) ,4) +transpose((((X+X) |(X+transpose(X,7) ) ) +transpose(((step(X,12) +(X|X) ) +(X+transpose(X,7) ) ) ,12) ) ,7) ) +transpose((shuffle((transpose(X,4) |X) ) +((X+arpeggio(X) ) +transpose((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ) ,4) ) +transpose((step(arpeggio(X) ,12) +transpose(((echo(transpose(X,-5) ,4,6) +transpose(X,4) ) +transpose(step(transpose(step(X,12) ,4) ,12) ,7) ) ,12) ) ,7) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) |echo((transpose(transpose(X,-5) ,4) +transpose((transpose(transpose(transpose(X,-5) ,4) ,4) +X) ,7) ) ,4,6) ) ,7) ) ) +transpose(transpose((transpose(transpose(arpeggio(echo(((arpeggio(step(X,12) ) +transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) ) ,-7) ,4) +step(arpeggio(transpose((X+transpose(transpose(X,-7) ,7) ) ,4) ) ,12) ) ,-5) ,7) ) ) ,7) ) ) ) ,7) ) |(echo(arpeggio(echo(transpose(transpose(echo(echo(((X|(X|X) ) |transpose(X,4) ) ,4,6) ,4,6) ,-7) ,-7) ,4,6) ) ,4,6) +echo(shuffle(transpose(transpose(echo((X|arpeggio(transpose((X+(X|X) ) ,-5) ) ) ,4,6) ,-7) ,-7) ) ,4,6) ) ) ,7) )
random seed used was 63985664

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