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(transpose((transpose((((transpose(X,4) +transpose(transpose(X,4) ,7) ) +transpose(step(step(X,12) ,12) ,7) ) +((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +(X+transpose(shuffle(X) ,12) ) ) ) ,-5) |transpose(((X+transpose(echo((transpose(X,-5) +transpose((X|X) ,7) ) ,4,6) ,7) ) +transpose(((shuffle((transpose(X,-5) |(echo((X+transpose(X,7) ) ,4,6) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ) ) |transpose(arpeggio(echo(X,4,6) ) ,-7) ) +arpeggio(((transpose((X|X) ,-7) |(((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) ) +transpose((transpose(X,-5) +transpose(X,7) ) ,12) ) ) ) ,12) ) ,4) ) ,4) ,4) +transpose(arpeggio(echo((((transpose((((((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) |(X+transpose(transpose(step(X,12) ,4) ,12) ) ) +transpose((transpose(arpeggio(step(X,12) ) ,4) +(transpose(shuffle(X) ,4) +transpose(transpose((X|X) ,4) ,12) ) ) ,4) ) +transpose((transpose((((X+X) +transpose(X,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,4) +(transpose(echo(shuffle(X) ,4,6) ,4) +(shuffle((X|X) ) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,12) ) ) ) ,7) ) |echo((transpose(transpose(transpose(X,-7) ,-7) ,4) +transpose(((X+arpeggio(X) ) +shuffle(shuffle(X) ) ) ,7) ) ,4,6) ) ,4) +transpose(shuffle(echo(((shuffle((step(((X+X) +X) ,12) |X) ) +transpose((X+X) ,4) ) |arpeggio((((X|X) +X) |transpose(transpose(X,-7) ,-5) ) ) ) ,4,6) ) ,7) ) +transpose(((((((shuffle(echo((((X+transpose(X,7) ) |step(X,12) ) +((X+X) +(X+transpose(X,12) ) ) ) ,4,6) ) |transpose((((X+transpose(X,4) ) +(step(X,12) |X) ) |transpose(X,-5) ) ,-7) ) +transpose((((transpose(arpeggio(transpose(X,-5) ) ,-7) |X) +transpose(arpeggio(X) ,7) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,-7) ) +arpeggio(step(transpose((shuffle(transpose(X,4) ) |transpose(X,-5) ) ,-7) ,12) ) ) |transpose(((transpose(((shuffle(X) +step(X,12) ) |(transpose(X,4) +(shuffle(X) +X) ) ) ,4) |shuffle(arpeggio(shuffle(((transpose(transpose(X,-7) ,4) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose((shuffle(X) +transpose(X,12) ) ,7) ) ) ) ) ) |transpose(transpose(shuffle(((((transpose(X,-7) +(X|X) ) |transpose(X,-5) ) +transpose(transpose(shuffle(X) ,-7) ,4) ) |transpose(shuffle(step(step(X,12) ,12) ) ,4) ) ) ,-5) ,4) ) ,4) ) +transpose((transpose(echo(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,-7) ,4,6) ,-5) |step(step(((X+transpose((X+transpose(X,12) ) ,7) ) +transpose((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,12) ) ,12) ,12) ) ,4) ) +transpose((((transpose(transpose((X+X) ,4) ,-7) |transpose(echo(transpose(((transpose(X,4) |(X|X) ) |arpeggio(X) ) ,-7) ,4,6) ,-5) ) +transpose(transpose(((shuffle((X+X) ) +transpose((X|X) ,12) ) +(transpose((X+X) ,4) |transpose(transpose(X,-5) ,4) ) ) ,4) ,12) ) +(shuffle(((step(transpose((X+X) ,4) ,12) +transpose(shuffle(X) ,7) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ) +echo(shuffle(((transpose(arpeggio((X+(shuffle(X) |shuffle(X) ) ) ) ,-5) +transpose(transpose(step(transpose((X+transpose(transpose(X,-7) ,12) ) ,-5) ,12) ,-7) ,4) ) +transpose(transpose((X|transpose((X|step(X,12) ) ,4) ) ,-5) ,7) ) ) ,4,6) ) ) ,7) ) ,7) ) +transpose(arpeggio((step(transpose((transpose((transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,-7) +transpose((((X|X) +transpose((X+X) ,12) ) |(X|X) ) ,-5) ) ,-5) +transpose(transpose(transpose(shuffle(X) ,-5) ,-7) ,7) ) ,-5) ,12) |echo(((transpose((echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) +echo(((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ) ,-5) +transpose((transpose((arpeggio(step(X,12) ) +((echo((X+X) ,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose((arpeggio(X) +transpose(X,12) ) ,7) ) ) ,4) +((shuffle(step(X,12) ) +transpose(transpose(transpose(arpeggio(X) ,-5) ,-7) ,4) ) +transpose(step(shuffle(transpose(X,-5) ) ,12) ,7) ) ) ,4) ) +transpose(((echo(transpose(arpeggio(transpose(X,-5) ) ,-5) ,4,6) +transpose(echo(transpose((X+transpose(shuffle(X) ,12) ) ,4) ,4,6) ,7) ) |(transpose((X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,4) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +(echo(step(X,12) ,4,6) +(echo(X,4,6) |X) ) ) ,7) ) ) ,7) ) ,4,6) ) ) ,7) ) ,4,6) ) ,7) ) +transpose(transpose((echo(transpose((transpose(((shuffle(((X|X) +(X+(X|X) ) ) ) |step(echo(arpeggio(echo((X+X) ,4,6) ) ,4,6) ,12) ) +(shuffle(((transpose(((X+X) +transpose((X+transpose(X,7) ) ,7) ) ,-5) +transpose(transpose(transpose((X+X) ,-7) ,-7) ,7) ) +transpose(transpose(step(((X|X) +transpose(transpose(X,4) ,12) ) ,12) ,-5) ,12) ) ) |transpose(transpose(((transpose(step(transpose(X,-5) ,12) ,-5) +transpose(transpose((transpose(echo(X,4,6) ,-7) +transpose((X+transpose(transpose(X,4) ,12) ) ,12) ) ,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) ,-5) ) ) ,4) |transpose(((transpose(transpose(arpeggio((arpeggio((X+transpose(shuffle(X) ,12) ) ) +((transpose(X,-5) +transpose(transpose((transpose(X,4) +transpose(X,-5) ) ,-7) ,4) ) +transpose(arpeggio(echo(transpose(echo(X,4,6) ,-5) ,4,6) ) ,7) ) ) ) ,4) ,-5) +transpose(transpose(step(transpose((((transpose(transpose(X,-5) ,-7) +echo(X,4,6) ) +transpose((arpeggio(X) |shuffle((X+transpose(X,7) ) ) ) ,4) ) +transpose(arpeggio(((X|X) +transpose(((X+X) +transpose((X|X) ,-5) ) ,7) ) ) ,7) ) ,-5) ,12) ,-5) ,4) ) +transpose(((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(echo(transpose(X,4) ,4,6) ,-7) ) +transpose(transpose(step((X+transpose(X,12) ) ,12) ,-7) ,12) ) +transpose(transpose((transpose(transpose(X,-5) ,-7) +(X+transpose(transpose(X,-7) ,7) ) ) ,-5) ,4) ) +transpose(((((shuffle(transpose((X|X) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) +transpose(arpeggio((transpose((((X+X) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +(transpose(X,4) |X) ) ,-7) +((((step(X,12) +(X|X) ) +X) +transpose((((transpose(transpose(X,-5) ,4) +transpose((transpose(X,-7) |transpose(X,-7) ) ,12) ) +transpose((X|X) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) ) ,12) ) +transpose(((echo((transpose((X|X) ,-7) +transpose(echo(step(X,12) ,4,6) ,7) ) ,4,6) +transpose(transpose(((transpose(transpose((X+transpose(X,12) ) ,4) ,-7) +transpose(transpose(transpose(X,4) ,-5) ,7) ) +transpose(transpose(transpose(transpose(X,-7) ,-7) ,-5) ,12) ) ,-5) ,7) ) +transpose(transpose(transpose(transpose((X+X) ,-5) ,-7) ,-5) ,7) ) ,4) ) +transpose((transpose(echo((X+transpose(transpose(X,-5) ,4) ) ,4,6) ,-5) +transpose(((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(step((step(X,12) +transpose(X,7) ) ,12) ,-5) ,4) ) +transpose(arpeggio(transpose(transpose(transpose(X,4) ,-7) ,-7) ) ,7) ) ,4) ) ,7) ) ,12) ) ,7) ) ,-7) ) ,-5) ,4,6) +transpose(shuffle(transpose(((transpose(step(((((X+X) +transpose(step(X,12) ,7) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose((transpose(X,4) +transpose((X+X) ,7) ) ,-7) ,7) ) ,12) ,4) +transpose(transpose((((transpose(X,-5) |X) +arpeggio(X) ) +transpose(transpose(X,-5) ,-7) ) ,-5) ,7) ) +transpose((transpose(arpeggio((shuffle(transpose((transpose((shuffle(transpose(X,4) ) +transpose(transpose(X,-7) ,12) ) ,-7) |(transpose(arpeggio(X) ,4) +transpose((X+transpose(X,-5) ) ,4) ) ) ,4) ) +(transpose(transpose((transpose((X+transpose(transpose(X,4) ,12) ) ,-7) +(((X+transpose(X,4) ) +transpose(X,7) ) |arpeggio((X+transpose(X,12) ) ) ) ) ,-5) ,4) +((shuffle((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) |((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) ,-7) +transpose(echo(transpose((X+transpose(shuffle(X) ,12) ) ,-5) ,4,6) ,4) ) +transpose(step((transpose(X,4) +transpose(X,7) ) ,12) ,7) ) ) +transpose(arpeggio(shuffle(((X+transpose(X,12) ) +arpeggio(X) ) ) ) ,7) ) ) ) ) ,4) |transpose(transpose(((transpose(echo(X,4,6) ,-5) +transpose((transpose(transpose((X+transpose(X,12) ) ,4) ,-5) +transpose(shuffle(X) ,12) ) ,4) ) +transpose((echo(X,4,6) |echo(transpose(arpeggio((X|X) ) ,-5) ,4,6) ) ,7) ) ,-5) ,-5) ) ,12) ) ,4) ) ,12) ) ,4) ,4) ) +transpose(step(transpose(shuffle(transpose(transpose((((transpose((((X|X) +(X+transpose(X,7) ) ) +transpose(X,7) ) ,4) +transpose(step(X,12) ,4) ) +transpose(transpose(((shuffle(X) +(X+transpose(X,12) ) ) +transpose((X+transpose(echo(X,4,6) ,12) ) ,7) ) ,-7) ,12) ) +transpose(((arpeggio(X) +transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ,7) ) +shuffle(shuffle(X) ) ) ,12) ) ,-5) ,-5) ) ,4) ,12) ,7) ) |step((transpose(transpose(echo(step(shuffle((step(arpeggio(((X+X) |X) ) ,12) +transpose(transpose(arpeggio(((((X+X) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) |transpose(transpose(X,-5) ,4) ) ) ,-5) ,12) ) ) ,12) ,4,6) ,4) ,-7) +transpose((((step(transpose((((shuffle(echo(transpose(X,-5) ,4,6) ) |((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(X,-7) ) +(X+transpose(X,12) ) ) ) +transpose(((shuffle(transpose((X+X) ,-5) ) |X) |transpose(((X+transpose((X+transpose(X,12) ) ,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ) ,4) ) +transpose(((transpose(((transpose((X+X) ,-7) +transpose((X|X) ,7) ) +(X+transpose(X,12) ) ) ,4) +transpose(((((transpose(X,-5) +transpose((arpeggio(X) +arpeggio(X) ) ,4) ) +transpose((echo(X,4,6) |echo(transpose(X,-7) ,4,6) ) ,7) ) +transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) ,-5) ,4) ,4) ) +transpose((transpose(transpose(X,4) ,-5) +transpose(transpose(transpose((X+X) ,-5) ,4) ,12) ) ,7) ) ,12) ) |(transpose(transpose(step(X,12) ,-7) ,-5) +transpose((transpose(X,-7) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ,12) ) ) ,7) ) ,-5) ,12) +transpose(transpose((arpeggio(((shuffle(transpose(X,-7) ) +transpose(step(X,12) ,-5) ) +transpose(step(transpose((transpose((X+X) ,4) +transpose(transpose(X,4) ,7) ) ,-5) ,12) ,12) ) ) +((step(transpose(((((X|X) +transpose((arpeggio(X) +transpose(X,-7) ) ,4) ) +transpose((X|X) ,7) ) +transpose(transpose(X,-7) ,12) ) ,-7) ,12) +transpose(transpose(X,-7) ,-7) ) +shuffle((X+X) ) ) ) ,-5) ,4) ) +transpose(echo(((transpose(arpeggio(shuffle(arpeggio(X) ) ) ,-5) +transpose((((transpose(transpose((X+X) ,-7) ,4) +transpose((transpose((X+X) ,4) +transpose((X+X) ,12) ) ,12) ) |transpose(transpose(shuffle(transpose((X+transpose(X,7) ) ,4) ) ,-5) ,4) ) +transpose(transpose((transpose(echo(((X+transpose(X,12) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,4,6) ,-7) +(transpose((((X+X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) |echo((((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) +transpose((shuffle(X) +X) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ,4,6) ) ) ,4) ,12) ) ,4) ) +transpose((((transpose((shuffle(X) |arpeggio(X) ) ,4) +(X+transpose(X,-7) ) ) |(((shuffle(X) +transpose(X,7) ) +(X|(X+transpose(X,7) ) ) ) +echo((X+transpose(X,7) ) ,4,6) ) ) |transpose((step(arpeggio(((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) |(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(X,-5) ,12) ) +transpose((transpose((X+X) ,-5) |transpose(X,4) ) ,12) ) ) ,4) ) ,7) ) ,4,6) ,7) ) +transpose(((step((((echo((step(echo((X+transpose(X,7) ) ,4,6) ,12) |transpose((shuffle(X) +echo(X,4,6) ) ,4) ) ,4,6) +transpose(shuffle(echo((shuffle(X) |(X+X) ) ,4,6) ) ,7) ) |((X+transpose(shuffle(transpose(X,-5) ) ,7) ) |(arpeggio(step(X,12) ) |(X+X) ) ) ) +transpose(((transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) +transpose(arpeggio((X+X) ) ,-5) ) +transpose(((transpose(X,4) +transpose(transpose(X,-5) ,12) ) +echo(X,4,6) ) ,-7) ) ,12) ) ,12) +transpose(((step((transpose(((transpose(echo((X+transpose(X,12) ) ,4,6) ,4) +(X|X) ) +transpose(echo(transpose(step((X+X) ,12) ,4) ,4,6) ,7) ) ,-7) +step(transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ,12) ) ,12) +transpose((step((echo((arpeggio(X) +transpose((X|X) ,7) ) ,4,6) +shuffle((echo((X|X) ,4,6) +transpose((X+(X|X) ) ,7) ) ) ) ,12) +transpose(echo(transpose((step(transpose(X,4) ,12) +((X|(X+transpose(X,7) ) ) |(X+X) ) ) ,4) ,4,6) ,7) ) ,4) ) +transpose(echo(step(transpose(echo((((shuffle(step(X,12) ) +transpose((transpose(X,-5) +shuffle(X) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |((transpose(X,-7) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,4,6) ,-5) ,12) ,4,6) ,7) ) ,4) ) +transpose(arpeggio((step((((echo((transpose((X+X) ,-5) +transpose(transpose(X,-5) ,12) ) ,4,6) +transpose((((((X+X) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(X,7) ) ,4) ) +transpose(step(transpose(step((transpose(X,4) |(X+X) ) ,12) ,4) ,12) ,7) ) +transpose(transpose((echo(transpose((step(X,12) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,4,6) +transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,-7) ,-5) ,12) ) ,-5) ,12) ) ,12) |step((transpose(step(transpose(transpose(X,-5) ,-7) ,12) ,4) +transpose(arpeggio(((X|X) +(X|X) ) ) ,12) ) ,12) ) ) ,7) ) ,7) ) ,7) ) ,12) )
random seed used was 170882662

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