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:
# of Tracks:
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After 20 generations the expression "X" became this:
(step(transpose(((((((transpose(arpeggio((((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +arpeggio(arpeggio(X) ) ) ) ,4) +arpeggio(arpeggio(shuffle(transpose(echo(X,4,6) ,-5) ) ) ) ) |echo(((echo((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,7) ) ,4,6) +transpose(((transpose(arpeggio((step(X,12) +step(X,12) ) ) ,-7) +transpose((arpeggio(echo(step(X,12) ,4,6) ) +echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,4) ) +transpose(shuffle(step(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ,7) ) ,4,6) ) +step((echo((shuffle((arpeggio((X|X) ) |X) ) +(echo((X+transpose(X,12) ) ,4,6) +transpose((transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) +(((((X+transpose((X+X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +(X+transpose(X,7) ) ) +transpose(transpose((transpose(X,-7) +transpose(step(X,12) ,7) ) ,4) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ) ,4,6) +step(transpose(echo(step(X,12) ,4,6) ,-7) ,12) ) ,12) ) +transpose(transpose((step(transpose(step(transpose(echo(((transpose(X,4) +transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) ,4) ,12) ,-5) ,12) +shuffle(step((step(((X+transpose(X,7) ) |X) ,12) +(((transpose(X,4) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ,12) ) ) ,4) ,7) ) |(step(transpose(transpose(step(((step(shuffle((X+X) ) ,12) +transpose(step((echo(X,4,6) +transpose((X|X) ,12) ) ,12) ,4) ) +transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(arpeggio(X) ,12) ) ,7) ) ,12) ,-7) ,-7) ,12) +transpose(((echo(transpose(arpeggio((step(X,12) +step(X,12) ) ) ,4) ,4,6) |step(transpose((X+X) ,-5) ,12) ) +transpose(transpose(transpose(echo(arpeggio(((transpose((echo(X,4,6) |echo(step(X,12) ,4,6) ) ,4) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(shuffle(transpose(echo(X,4,6) ,4) ) ,7) ) ) ,4,6) ,4) ,-7) ,7) ) ,7) ) ) +transpose(arpeggio(arpeggio(((((transpose(step(transpose(X,4) ,12) ,-7) |shuffle((X|X) ) ) +transpose(((((arpeggio(arpeggio(X) ) +transpose((X+transpose(X,7) ) ,12) ) +transpose(((arpeggio(X) +transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,7) ) +transpose(X,12) ) +transpose(arpeggio(transpose(step(X,12) ,-5) ) ,7) ) ,12) ) +transpose(shuffle((shuffle((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,12) ) ) |transpose((echo(transpose(X,4) ,4,6) |step(transpose((X+transpose(X,7) ) ,-7) ,12) ) ,4) ) ) ,12) ) +transpose((((shuffle(transpose(((X+transpose(arpeggio(shuffle(X) ) ,7) ) +transpose((((X+transpose(X,7) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(shuffle(step(X,12) ) ,7) ) ,7) ) ,-5) ) +transpose(arpeggio((step((X+transpose((X+transpose(X,7) ) ,7) ) ,12) +transpose((((shuffle(echo(X,4,6) ) +transpose(X,4) ) +transpose((arpeggio(X) +transpose((X+X) ,12) ) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,12) ) ,12) ) ) ,12) ) +transpose(((shuffle((transpose(transpose(X,-5) ,4) +transpose((X+X) ,7) ) ) +transpose(echo(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ,4) ) +transpose(echo(echo((transpose((X+arpeggio(X) ) ,-7) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,4,6) ,4,6) ,7) ) ,4) ) +transpose(echo(transpose(transpose((step(X,12) |arpeggio(echo(X,4,6) ) ) ,-7) ,4) ,4,6) ,7) ) ,7) ) ) ) ,12) ) ,-5) ,12) |(transpose((echo(transpose(shuffle(((((arpeggio(step(transpose((shuffle(step(X,12) ) +echo(X,4,6) ) ,-7) ,12) ) +transpose(transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose(step(shuffle(echo(transpose(((X+transpose(X,7) ) +transpose(((X+X) +shuffle(X) ) ,7) ) ,-5) ,4,6) ) ,12) ,7) ) +transpose((echo((shuffle(X) +transpose(shuffle(X) ,12) ) ,4,6) +transpose(((echo((step(X,12) +step(transpose(X,-5) ,12) ) ,4,6) +transpose(((echo(X,4,6) +transpose(step(X,12) ,4) ) +transpose(transpose(shuffle(shuffle((X+X) ) ) ,4) ,7) ) ,4) ) +transpose((arpeggio((shuffle(X) +transpose(X,12) ) ) +echo(step(echo(X,4,6) ,12) ,4,6) ) ,7) ) ,12) ) ,4) ) +transpose(((transpose(((transpose(echo(X,4,6) ,4) +transpose(transpose((shuffle(X) +transpose(step(X,12) ,12) ) ,4) ,4) ) +transpose(arpeggio(arpeggio(shuffle((X|X) ) ) ) ,7) ) ,4) +transpose(echo(((step(transpose(step(echo(X,4,6) ,12) ,-5) ,12) +transpose((echo((arpeggio(X) +transpose(X,7) ) ,4,6) +X) ,4) ) +transpose(transpose((transpose(shuffle(X) ,4) +transpose(step(transpose(X,4) ,12) ,7) ) ,-5) ,7) ) ,4,6) ,4) ) +transpose(arpeggio((arpeggio(echo(((X|X) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ) +transpose((shuffle(X) +transpose(echo(X,4,6) ,12) ) ,7) ) ) ,7) ) ,7) ) ) ,-7) ,4,6) +echo(transpose((transpose(((X+transpose(X,7) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,-7) +echo(arpeggio(X) ,4,6) ) ,-7) ,4,6) ) ,4) |(arpeggio(((((echo(((echo(transpose(((transpose((X+transpose(X,7) ) ,4) +transpose(((X+transpose(X,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,4,6) +transpose(arpeggio(transpose(((X|X) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ) ,4) ) +transpose(((shuffle(shuffle((echo(X,4,6) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) ) +transpose(((transpose(step(step(X,12) ,12) ,4) |transpose(((X+transpose(transpose(X,-7) ,7) ) +transpose(echo(X,4,6) ,7) ) ,-7) ) |(step(shuffle(shuffle(step((X+transpose(X,7) ) ,12) ) ) ,12) +transpose(arpeggio(echo(transpose(transpose((X+X) ,-5) ,4) ,4,6) ) ,7) ) ) ,4) ) +transpose(((echo(arpeggio(((step((transpose(X,-7) |(X|X) ) ,12) +transpose(((X+transpose(X,7) ) |(X+transpose(X,7) ) ) ,4) ) +transpose(((((X+transpose(shuffle(X) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((arpeggio(X) +X) ,4) ) +transpose(((echo(X,4,6) +transpose((X|X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,7) ) ) ,4,6) +transpose((transpose((arpeggio(arpeggio((X+transpose(X,7) ) ) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,-5) +transpose((echo(arpeggio(X) ,4,6) +((echo((transpose(X,-7) +transpose(transpose(X,4) ,7) ) ,4,6) +transpose(transpose(echo(((X+transpose(X,7) ) +X) ,4,6) ,-7) ,4) ) +transpose(echo((step(X,12) +transpose(echo(X,4,6) ,7) ) ,4,6) ,7) ) ) ,12) ) ,4) ) +transpose(echo(step(((transpose(X,-7) +transpose(step(X,12) ,12) ) |(X|arpeggio(X) ) ) ,12) ,4,6) ,7) ) ,7) ) ,7) ) ,4,6) +((((((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |X) +transpose((step(X,12) +transpose(X,12) ) ,12) ) |shuffle(arpeggio(transpose(X,4) ) ) ) +transpose(step(echo(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ,-5) ,4,6) ,12) ,12) ) ) +transpose(transpose(shuffle((echo(transpose(transpose(X,-7) ,4) ,4,6) |(step(shuffle((X+X) ) ,12) |echo(shuffle(arpeggio(X) ) ,4,6) ) ) ) ,-5) ,7) ) +transpose(((echo(echo(transpose(shuffle(shuffle((arpeggio(step(X,12) ) +transpose(echo(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ,7) ) ) ) ,-5) ,4,6) ,4,6) +transpose((transpose(echo(step((((X|((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ) +transpose(shuffle(arpeggio(step(X,12) ) ) ,4) ) +transpose(((X+transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,12) ,4,6) ,4) |(echo(((transpose((X+X) ,-5) +transpose(X,-7) ) +transpose(((step(X,12) +transpose((X+transpose(X,7) ) ,12) ) +transpose(shuffle((X+X) ) ,7) ) ,7) ) ,4,6) +echo((transpose((((transpose((transpose(X,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) +X) +transpose(((((X|X) +transpose((X|X) ,7) ) +transpose((((X+transpose(echo(X,4,6) ,7) ) +transpose(arpeggio(X) ,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(((X+(X+transpose(X,12) ) ) |X) ,7) ) ,4) ) +transpose((echo(arpeggio(X) ,4,6) |(X+transpose(X,12) ) ) ,7) ) ,4) +transpose(transpose(transpose((transpose(X,4) +transpose((X+transpose(X,12) ) ,12) ) ,-7) ,4) ,12) ) ,4,6) ) ) ,7) ) +transpose(arpeggio(shuffle(echo(((transpose((shuffle((echo(X,4,6) +X) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) +transpose((X+transpose(transpose(X,-5) ,7) ) ,12) ) ,7) ) ,-7) +shuffle(((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |step(arpeggio((X+transpose((X+transpose(X,7) ) ,7) ) ) ,12) ) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ) ,12) ) ) ) +transpose(arpeggio(step(echo((transpose(((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ,-5) +transpose(arpeggio((X|X) ) ,12) ) ,4,6) ,12) ) ,7) ) ,4,6) ) ) ,12) ) ,4) ) +transpose(echo(((shuffle(shuffle((((transpose(X,-7) +((((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) +transpose(((transpose(X,4) +(X+X) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ) +transpose((transpose(X,-7) +echo((shuffle(X) +transpose(X,12) ) ,4,6) ) ,4) ) +transpose(((transpose(X,-7) +transpose(((shuffle(X) |(X+transpose(X,7) ) ) +transpose((((X+X) +X) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,7) ) ,4) ) +transpose(echo(transpose(echo(echo(X,4,6) ,4,6) ,-7) ,4,6) ,7) ) ,7) ) ) ) +transpose((echo(shuffle((step(X,12) +transpose((X+transpose(echo(X,4,6) ,7) ) ,7) ) ) ,4,6) +transpose(shuffle(step(step(echo((echo(X,4,6) +(X+X) ) ,4,6) ,12) ,12) ) ,7) ) ,7) ) |(((echo(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,7) ) ) ,4,6) +transpose(arpeggio((transpose((transpose((X+transpose(X,12) ) ,-7) |X) ,4) |(step(shuffle(step(X,12) ) ,12) |shuffle(echo(X,4,6) ) ) ) ) ,7) ) +transpose((echo(shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) +transpose((X+transpose((X+X) ,7) ) ,7) ) ) ,4,6) +transpose(echo(echo(X,4,6) ,4,6) ,-7) ) ,4) ) +transpose((((arpeggio((shuffle(((((X|X) +transpose(X,4) ) +transpose(((X+transpose(X,7) ) +X) ,4) ) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) +transpose(((shuffle(transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose(transpose(transpose((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,4) ,4) ) +transpose((step(transpose(X,-7) ,12) +transpose((X|X) ,-7) ) ,7) ) ,12) ) ) +transpose(transpose(transpose(shuffle(echo(transpose(step(echo((X|X) ,4,6) ,12) ,-7) ,4,6) ) ,4) ,4) ,4) ) +transpose((echo(echo(arpeggio(X) ,4,6) ,4,6) +transpose(((step(X,12) +transpose(shuffle((X+X) ) ,12) ) +transpose(arpeggio(shuffle(X) ) ,12) ) ,12) ) ,7) ) +transpose(transpose((echo((((step((X+X) ,12) +transpose(X,-5) ) +transpose(transpose((X+X) ,-7) ,4) ) +transpose((X|arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) ,4,6) +transpose(shuffle(step(transpose(((X+X) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,12) ) ,12) ) ,-5) ,7) ) ,7) ) ) ,4,6) ,7) ) ) +transpose(transpose(echo(((echo(step((((transpose(echo(arpeggio(shuffle(((step(X,12) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,4,6) ,4) +transpose(arpeggio(echo(arpeggio(echo(X,4,6) ) ,4,6) ) ,7) ) +transpose(arpeggio(((transpose(transpose(X,-5) ,-5) +transpose((transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,4) ) ,7) ) ,-7) +(arpeggio((X+transpose(X,7) ) ) +step(transpose(X,4) ,12) ) ) ,4) ) +transpose((step(echo((transpose(X,-5) +transpose(step(X,12) ,7) ) ,4,6) ,12) |(((shuffle((X+transpose(X,7) ) ) +transpose(transpose(X,4) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) +transpose(shuffle(transpose(arpeggio(transpose(X,-5) ) ,4) ) ,12) ) ) ,7) ) ) ,4) ) +transpose(step(step(echo(transpose((((transpose(echo(arpeggio(echo(X,4,6) ) ,4,6) ,-7) +transpose(((X+transpose(X,7) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,4) ) +transpose(((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose((shuffle(((((X|X) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) |echo(X,4,6) ) ) +transpose(((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ,7) ) ,7) ) ,4) ,4,6) ,12) ,12) ,7) ) ,12) ,4,6) +transpose(transpose(transpose((arpeggio(((((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) +arpeggio(step(X,12) ) ) +transpose((shuffle(X) |(((transpose(X,4) +(X+transpose(X,7) ) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ) ,12) ) +transpose(echo((step(X,12) +echo(X,4,6) ) ,4,6) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ) +transpose(transpose(transpose(step(arpeggio(transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,-5) ) ,12) ,4) ,4) ,7) ) ,-5) ,-5) ,4) ) +transpose(((((arpeggio(X) +(X|(X|X) ) ) +transpose((arpeggio(((arpeggio(X) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,4) ) +transpose((transpose(X,4) +X) ,7) ) ) +transpose(step(X,12) ,7) ) ,7) ) +transpose((((shuffle((transpose(step(shuffle(X) ,12) ,-7) |transpose(transpose((X+X) ,-5) ,-5) ) ) +transpose((arpeggio((X+X) ) |shuffle(step(X,12) ) ) ,4) ) +transpose((((X+transpose(X,7) ) +transpose((((echo(X,4,6) +transpose(step(X,12) ,7) ) +transpose(echo(transpose((X+(X|X) ) ,4) ,4,6) ,7) ) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,7) ) ,4) ) +transpose((echo(step(X,12) ,4,6) +transpose(transpose(X,-5) ,7) ) ,7) ) ,7) ) +step(((transpose(step(step(transpose(step(X,12) ,-7) ,12) ,12) ,4) +transpose(((transpose(arpeggio(shuffle(X) ) ,4) +transpose(((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,7) ) ,4) ) +transpose(arpeggio((echo(shuffle((X+X) ) ,4,6) +transpose(step((step(X,12) +X) ,12) ,7) ) ) ,7) ) ,12) ) ,7) ) +transpose(step(echo((step(((X+X) +transpose(step(X,12) ,7) ) ,12) +transpose(transpose(((shuffle(X) +transpose(step(arpeggio((X+X) ) ,12) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,4) ,7) ) ,4,6) ,12) ,4) ) ,7) ) ,4,6) ,4) ,7) ) ) )
random seed used was 229115035

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