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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Phrase for X:
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After 20 generations the expression "X" became this:
((transpose(echo(step((transpose(transpose(transpose(transpose(echo((step(transpose(X,-7) ,12) |shuffle((X+X) ) ) ,4,6) ,-7) ,-7) ,-5) ,-7) +transpose(transpose(step(((echo(shuffle((transpose(shuffle(X) ,-5) |(X+transpose(X,-7) ) ) ) ,4,6) +transpose(echo(((step(((X|X) +transpose(shuffle(X) ,7) ) ,12) +transpose(((X|X) +transpose(X,4) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,7) ) ,4,6) ,4) ) +transpose(step(((transpose((X|X) ,-7) +transpose(transpose(step(X,12) ,-7) ,7) ) +((X+(transpose(X,4) +transpose(X,7) ) ) |step(((X+transpose((X|X) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ) ,12) ,7) ) ,12) ,-7) ,7) ) ,12) ,4,6) ,-5) +transpose(echo(((((((shuffle(echo(transpose(((X+transpose(transpose(transpose(transpose(X,-7) ,-5) ,-7) ,4) ) +transpose(shuffle((X|step(X,12) ) ) ,7) ) ,4) ,4,6) ) |(((transpose((((transpose(transpose(X,4) ,4) |shuffle(X) ) |(transpose(X,-7) |(X+X) ) ) +transpose(transpose((transpose((X+transpose(X,7) ) ,-7) |(X|(X|X) ) ) ,-7) ,12) ) ,4) +transpose(((((X+transpose(arpeggio(X) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) |echo(X,4,6) ) +transpose((transpose(step(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) ,12) ,4) |transpose(arpeggio(arpeggio(transpose(X,4) ) ) ,-7) ) ,12) ) ,4) ) +transpose(((((X|X) +X) +transpose((transpose(X,-7) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,12) ) +transpose(((echo((transpose((X+transpose(X,4) ) ,-7) |(transpose(X,-7) |(step(X,12) |X) ) ) ,4,6) |shuffle((((transpose(X,-7) +transpose(arpeggio(X) ,4) ) +transpose((X+X) ,7) ) +transpose(transpose(X,-7) ,4) ) ) ) +(transpose(((X+X) +(X|X) ) ,-5) +((transpose(X,4) |X) |(X+transpose(X,12) ) ) ) ) ,7) ) ,7) ) |(((((((X+shuffle(X) ) |step(transpose(X,-5) ,12) ) +transpose((((X|X) +transpose((X|X) ,12) ) +transpose(X,-7) ) ,4) ) +transpose(((X+transpose(X,12) ) |transpose(X,4) ) ,7) ) |step((((X|X) +transpose(X,12) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ,12) ) +transpose(transpose(echo(((X+X) |transpose((X+X) ,-5) ) ,4,6) ,-7) ,4) ) +transpose(transpose(shuffle(shuffle(X) ) ,-7) ,7) ) ) ) +transpose(transpose(transpose(transpose(shuffle(((transpose(echo(((X|X) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,-5) +transpose(transpose((step(X,12) +transpose(step(X,12) ,12) ) ,-7) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,4) ,-7) ,7) ) ) ,4) ,4) ,4) ,12) ) +transpose(transpose(((arpeggio((echo((transpose(arpeggio((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) +transpose(transpose(transpose((X|(X+X) ) ,-5) ,4) ,12) ) ,4,6) +transpose(((transpose(step(transpose((X|X) ,-7) ,12) ,-5) +transpose(((X+(X+transpose(echo(X,4,6) ,12) ) ) +transpose(transpose(echo(X,4,6) ,-5) ,12) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(X,-7) ) ,7) ) ,-5) ) ) +transpose((transpose(transpose(X,-7) ,-7) |transpose(transpose(transpose(X,4) ,-7) ,4) ) ,4) ) +transpose((shuffle(((X+X) +transpose(((X+X) +transpose(((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) ) +transpose((step(shuffle(step(X,12) ) ,12) +transpose(echo(transpose(transpose(X,4) ,-7) ,4,6) ,12) ) ,4) ) ,7) ) ,-5) ,4) ) +transpose((((transpose((arpeggio(arpeggio((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(step(transpose(X,4) ,12) ,12) ) ) ) +transpose(transpose(shuffle((X+X) ) ,4) ,7) ) ,4) +transpose(transpose(transpose(transpose((X+X) ,-7) ,-7) ,-5) ,4) ) +transpose(((arpeggio(transpose(echo((transpose(arpeggio(step(X,12) ) ,4) +(X+(X+transpose(X,12) ) ) ) ,4,6) ,-7) ) +transpose((((((X|X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(((echo(X,4,6) +(X+X) ) +transpose(arpeggio(step(X,12) ) ,12) ) ,4) ) +transpose(((echo(X,4,6) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,-5) ) +transpose((step(echo(echo(arpeggio((echo(X,4,6) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ) ,4,6) ,4,6) ,12) +transpose(transpose(transpose(((X+X) +X) ,-7) ,4) ,4) ) ,12) ) ,12) ) |(((echo((transpose(X,-5) +arpeggio(((X+transpose(X,7) ) +transpose(X,-7) ) ) ) ,4,6) +transpose(transpose((((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) +transpose((X|step(X,12) ) ,12) ) ,-7) ,12) ) |transpose((shuffle(step(X,12) ) +transpose(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(X,-5) ,7) ) +(arpeggio(arpeggio((arpeggio(X) +transpose(X,7) ) ) ) |((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(X,7) ) ) ) ,-5) ) ,-5) ) |arpeggio(step((step(arpeggio(transpose(transpose(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4) ,-7) ) ,12) |(transpose(echo(echo((X+transpose(X,12) ) ,4,6) ,4,6) ,-5) |arpeggio(((transpose(transpose((X+transpose(X,12) ) ,4) ,-5) +transpose(echo(step(X,12) ,4,6) ,4) ) +transpose(((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) ,7) ) ) ) ) ,12) ) ) ) ,7) ) +transpose(((((step(step(step((transpose(transpose(step(((X+transpose(X,12) ) |X) ,12) ,4) ,4) +((echo((transpose(X,4) +(X|X) ) ,4,6) +transpose(((X|X) |transpose(X,-5) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ,12) ,12) +transpose((transpose((X|echo(X,4,6) ) ,4) +((X+(X+transpose(X,12) ) ) +echo(X,4,6) ) ) ,-7) ) +((transpose((transpose((((X|X) |transpose(X,-7) ) +step(X,12) ) ,-7) +transpose(transpose(transpose((transpose(X,4) +step(echo(X,4,6) ,12) ) ,4) ,-7) ,12) ) ,-7) +transpose(transpose((step(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) +transpose((transpose(echo(transpose(transpose(X,-7) ,-7) ,4,6) ,-7) +arpeggio(transpose(transpose(X,4) ,4) ) ) ,12) ) ,4) ,4) ) +transpose(transpose(arpeggio(transpose(((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) +transpose((step(X,12) +transpose(echo(X,4,6) ,7) ) ,4) ) ,4) ) ,-7) ,7) ) ) |transpose(step(shuffle(transpose(transpose(arpeggio((transpose(X,-7) |transpose(X,4) ) ) ,-7) ,4) ) ,12) ,-5) ) +transpose(transpose((transpose(((((transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,-7) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose((transpose(transpose(shuffle(X) ,-7) ,4) +transpose(X,7) ) ,7) ) +transpose(step(step(step(X,12) ,12) ,12) ,7) ) |transpose(shuffle(transpose(((X|X) +echo((X|X) ,4,6) ) ,4) ) ,-5) ) ,-5) +transpose(((transpose((transpose(transpose(echo(step(X,12) ,4,6) ,-7) ,4) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ) ,7) ) ,4) |echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ) +transpose((((transpose(transpose((((X|X) +transpose(step(X,12) ,4) ) +transpose((transpose(X,4) |transpose(X,4) ) ,7) ) ,-5) ,4) +transpose(shuffle((((((X+transpose(X,12) ) +transpose(((transpose(X,-5) +transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) +transpose(step((X+transpose(X,12) ) ,12) ,-7) ) +step(((X+transpose(X,12) ) +transpose(X,7) ) ,12) ) |((transpose((X+transpose(X,7) ) ,-7) +transpose(echo(X,4,6) ,-5) ) +transpose(transpose(X,4) ,7) ) ) ) ,12) ) +transpose(((step(X,12) +transpose((X+X) ,12) ) +echo((transpose(((X|X) |(X+transpose(X,12) ) ) ,4) +transpose(transpose(((X+X) |(X+transpose(X,7) ) ) ,-7) ,7) ) ,4,6) ) ,4) ) +transpose((transpose(((transpose(X,4) +transpose(shuffle((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ) ,7) ) +transpose(echo(X,4,6) ,12) ) ,4) +transpose(((transpose((transpose(X,-7) +transpose((X+arpeggio(X) ) ,12) ) ,4) +echo((transpose(transpose(X,-7) ,-5) +transpose(X,12) ) ,4,6) ) +step(transpose(((step(echo(X,4,6) ,12) +transpose((X+X) ,4) ) +(transpose(X,-7) +transpose((X+X) ,12) ) ) ,4) ,12) ) ,7) ) ,7) ) ,7) ) ,7) ) ,-5) ,12) ) ,4) ) +transpose(transpose(step(arpeggio(transpose(((transpose(transpose(transpose((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ,-5) ,-7) ,-5) |(((((X+step(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+(X+X) ) ,7) ) +transpose((transpose(X,-7) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,7) ) +((((((X+transpose(X,12) ) +X) +step(X,12) ) +transpose(((X+transpose(X,12) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,7) ) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose((((transpose(transpose(X,4) ,-7) |((X+X) +(X+transpose(X,7) ) ) ) +transpose(echo(X,4,6) ,4) ) +transpose((step(X,12) |(X+X) ) ,7) ) ,7) ) ) ) +(transpose(((transpose(X,-5) +transpose(((arpeggio(X) +transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose((transpose(X,4) +transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,4) ,7) ) ,-5) |transpose(transpose((transpose(X,4) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,4) ,-7) ) ) ,-5) ) ,12) ,4) ,7) ) ,4,6) ,7) ) |((transpose((arpeggio(transpose(transpose(step((X|echo(transpose(echo((((X|X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,-7) ,4,6) ) ,12) ,-5) ,4) ) |transpose((((arpeggio(arpeggio((X+X) ) ) +transpose(transpose(transpose(((transpose(X,4) +transpose(((X+X) |(X+X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ,4) ,12) ) |(echo(X,4,6) +(((echo(echo(X,4,6) ,4,6) |shuffle(shuffle(X) ) ) +transpose(((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,-5) ) +transpose(((X+X) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,7) ) ) ) +transpose(transpose(transpose(((echo(transpose(transpose(echo(X,4,6) ,-5) ,-5) ,4,6) +((X|X) +transpose(((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ) +((transpose(step(X,12) ,4) +transpose(transpose((X+transpose(((X|X) |echo(X,4,6) ) ,7) ) ,-5) ,4) ) +transpose(transpose((step((X+X) ,12) |(transpose(X,-5) +X) ) ,4) ,7) ) ) ,-5) ,4) ,7) ) ,-7) ) ,-5) +transpose(transpose(transpose(((echo((transpose(transpose(transpose(transpose(X,-7) ,-5) ,4) ,-7) +echo(echo(step((X+X) ,12) ,4,6) ,4,6) ) ,4,6) +transpose((((((((X+X) +transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(shuffle(X) ,4) ) +transpose((transpose(X,-5) |echo(X,4,6) ) ,7) ) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(transpose(((transpose((transpose(X,4) +transpose(step(X,12) ,12) ) ,-5) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) |(transpose(X,4) |transpose(transpose(X,-5) ,-5) ) ) +transpose(transpose(X,4) ,-5) ) ,4) ) +transpose(step((arpeggio(arpeggio(X) ) +echo(((X+X) +transpose(X,12) ) ,4,6) ) ,12) ,7) ) ,4) ,7) ) ,4) ,4) ,12) ) |(shuffle(transpose(shuffle(shuffle((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(X,12) ) ) ) ,-7) ) |((echo(((((shuffle(transpose((transpose(X,-7) +transpose(X,4) ) ,4) ) +transpose(step(echo(transpose(X,4) ,4,6) ,12) ,4) ) +transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-5) ,7) ) +transpose(transpose(((shuffle(X) +transpose((X+transpose(X,7) ) ,12) ) +(X+transpose(shuffle((X|X) ) ,12) ) ) ,4) ,4) ) +transpose(transpose(transpose(shuffle(X) ,-5) ,-5) ,7) ) ,4,6) |(shuffle(arpeggio(transpose(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,-5) ) ) +shuffle(transpose((arpeggio((X|(X+transpose(X,7) ) ) ) +transpose((shuffle(X) |echo(X,4,6) ) ,-7) ) ,-7) ) ) ) +transpose((((step((transpose(((step((step(X,12) |X) ,12) +transpose(step((X|X) ,12) ,4) ) +transpose((((X|X) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(X,-7) ,12) ) ,7) ) ,4) |((echo(((X+transpose(X,7) ) |shuffle(X) ) ,4,6) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ) |(transpose(X,-5) +transpose(arpeggio(X) ,7) ) ) ) ,12) +transpose(transpose(transpose(transpose(((transpose(X,4) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,4) ,7) ) ,-7) ,4) ,-7) ,7) ) +transpose(transpose(((transpose(echo((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,4) +transpose((step((X|transpose(X,4) ) ,12) +transpose((((arpeggio(X) +transpose((X+X) ,7) ) |X) +transpose(transpose(arpeggio(X) ,4) ,12) ) ,7) ) ,12) ) +transpose(transpose(((transpose(X,-5) +transpose(((X+transpose(X,7) ) |step(X,12) ) ,7) ) +((X|(X+transpose(X,7) ) ) |arpeggio(step(X,12) ) ) ) ,-5) ,-5) ) ,-5) ,4) ) +transpose(((((transpose(transpose(shuffle(X) ,4) ,-7) +transpose((echo(X,4,6) +transpose((transpose(X,4) |X) ,7) ) ,4) ) +transpose(transpose((echo(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,4,6) +transpose(echo(((step(echo(X,4,6) ,12) +transpose(X,-7) ) |(((X|X) +transpose(shuffle(X) ,12) ) +transpose(X,7) ) ) ,4,6) ,7) ) ,-7) ,12) ) +transpose((transpose(((transpose(X,4) +transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) ,4) +transpose(transpose(transpose(X,4) ,4) ,4) ) ,-7) ) +((transpose((arpeggio(transpose(X,-7) ) +step((X|X) ,12) ) ,-5) +transpose(transpose(((shuffle(arpeggio(shuffle(transpose(X,-5) ) ) ) +transpose(transpose(((X|X) +transpose(transpose(X,-5) ,12) ) ,-5) ,12) ) |transpose((step(transpose(transpose(X,-7) ,-7) ,12) +transpose((X+transpose(transpose(X,-5) ,7) ) ,12) ) ,-5) ) ,-5) ,4) ) +transpose(arpeggio(step((transpose(((X+X) |X) ,-7) |arpeggio(transpose((X+transpose(X,12) ) ,-5) ) ) ,12) ) ,7) ) ) ,7) ) ,7) ) ) ) )
random seed used was 166358381

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