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 19 generations the expression "X" became this:
echo(transpose(((echo((((shuffle(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(echo(shuffle(X) ,4,6) ,12) ) ,-7) ) +transpose(arpeggio(transpose(transpose(transpose((step(X,12) +transpose(step(transpose(echo(X,4,6) ,-7) ,12) ,12) ) ,-7) ,4) ,-7) ) ,7) ) +transpose(((transpose((transpose(X,-5) |((X+shuffle(X) ) +transpose(((X|X) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ,7) ) ) ,-7) +transpose(((arpeggio(transpose((transpose(X,4) +transpose(X,12) ) ,-7) ) +transpose(transpose(step((X+X) ,12) ,-7) ,4) ) +transpose(step(shuffle((((transpose(shuffle(X) ,4) +transpose(((X+X) +X) ,4) ) +transpose(echo(X,4,6) ,7) ) |(X+transpose(transpose(X,-5) ,12) ) ) ) ,12) ,7) ) ,4) ) +transpose(transpose(((((shuffle((((X+transpose(((X|X) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) +transpose(echo(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,7) ) ) +transpose(X,4) ) +transpose(arpeggio(shuffle(arpeggio(arpeggio(X) ) ) ) ,7) ) +transpose(transpose(((echo(arpeggio(X) ,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,-5) ,4) ) +transpose((((arpeggio(X) +(X|echo(X,4,6) ) ) +transpose((X+transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ,7) ) |shuffle(((X+transpose(X,7) ) +transpose(X,7) ) ) ) ,7) ) ,4) ,7) ) ,7) ) +transpose(shuffle(step((((step((transpose(X,-7) |X) ,12) +transpose(((step(X,12) +transpose(X,4) ) +transpose(transpose(step(transpose(X,-7) ,12) ,-7) ,7) ) ,12) ) +transpose(((transpose(transpose(X,-5) ,-7) +transpose(shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,4) ) +transpose((step(shuffle(X) ,12) +transpose(transpose(step(X,12) ,-7) ,12) ) ,7) ) ,4) ) +transpose(((arpeggio((echo((X+transpose(X,12) ) ,4,6) +transpose((X+transpose(X,12) ) ,12) ) ) +transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,12) ) ,7) ) ,4,6) +transpose((transpose(echo(echo(echo(arpeggio((X+transpose(X,7) ) ) ,4,6) ,4,6) ,4,6) ,-5) +transpose((((((echo(shuffle(X) ,4,6) +transpose(echo(shuffle((X+transpose(X,12) ) ) ,4,6) ,7) ) |transpose(echo(transpose(echo(echo((echo((X+X) ,4,6) +(transpose(step(X,12) ,4) +echo(X,4,6) ) ) ,4,6) ,4,6) ,4) ,4,6) ,4) ) +transpose(transpose(transpose((transpose((X+shuffle(arpeggio(X) ) ) ,-5) |arpeggio(shuffle(step(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) ) ) ,4) ,-7) ,12) ) +transpose(((((step((X+X) ,12) +transpose(transpose(arpeggio((X|X) ) ,4) ,4) ) +transpose(((arpeggio(((transpose(X,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +X) +transpose(transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,-7) ,12) ) ,7) ) +transpose((((transpose(transpose(arpeggio(transpose(X,-5) ) ,4) ,4) +transpose(X,4) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,-5) ,-7) ,7) ) +((((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X|X) ) ,4) ) +transpose(step(X,12) ,7) ) +X) +transpose(((step(X,12) +transpose((X+X) ,4) ) +transpose(X,7) ) ,-7) ) ) ,4) ) +transpose((((step(X,12) +(step(X,12) +transpose(X,-7) ) ) +step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,7) ) ,12) ) +transpose(arpeggio(((arpeggio(((X+transpose(transpose(X,-7) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,7) ) ) |(step((shuffle(echo(X,4,6) ) +(X|arpeggio(X) ) ) ,12) +(transpose(transpose(X,4) ,4) +transpose(transpose(arpeggio(X) ,4) ,12) ) ) ) +(((((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) |(transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(transpose(arpeggio(echo(X,4,6) ) ,-7) ,12) ) +transpose(((step(X,12) |((X+X) |transpose(X,-7) ) ) |echo((X+transpose(X,12) ) ,4,6) ) ,12) ) ) ) ,7) ) ,12) ) ,7) ) +transpose(((step(arpeggio(shuffle((transpose(echo(step(transpose(step(X,12) ,-5) ,12) ,4,6) ,-5) +transpose(((((transpose(shuffle(X) ,-7) |transpose(X,4) ) +transpose((((shuffle(X) +transpose((transpose(transpose(X,-5) ,4) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose((echo(X,4,6) +(transpose(X,-5) +transpose(X,7) ) ) ,7) ) ,4) ) +transpose(transpose(((transpose(echo(arpeggio(X) ,4,6) ,-7) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,-7) ,7) ) +((((step(X,12) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) +transpose(((((X+transpose(X,7) ) |transpose(step(X,12) ,-7) ) +transpose((((transpose(X,-7) |transpose(X,-5) ) +transpose((X+transpose(X,-7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,7) ) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,7) ) ) ,-5) ) ) ) ,12) +transpose((transpose((((((((((X+transpose(X,7) ) +echo(X,4,6) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) |((X|X) |transpose(X,-7) ) ) +(step(echo(X,4,6) ,12) +transpose((X+transpose(X,12) ) ,7) ) ) +(transpose(shuffle((((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) +step((X+transpose(X,12) ) ,12) ) ) ,-7) +((transpose((shuffle(X) +transpose(X,12) ) ,-7) +transpose((transpose(step((X+transpose(X,12) ) ,12) ,-7) |transpose(transpose(step(X,12) ,4) ,-5) ) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ) ) +transpose(arpeggio(transpose((arpeggio(transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose(transpose(((echo(arpeggio(X) ,4,6) +transpose(transpose(X,-5) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ,12) ) ,4) ) ,7) ) +transpose(arpeggio(transpose(echo((step(X,12) +transpose(transpose(X,-5) ,7) ) ,4,6) ,4) ) ,12) ) +transpose(transpose((((transpose(transpose((X|X) ,-7) ,-7) +transpose((((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) +transpose(arpeggio(transpose(transpose(X,-7) ,-7) ) ,4) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,4) ) +transpose(step((echo(X,4,6) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(X,12) ) ,7) ) ,12) ,7) ) +transpose((shuffle((transpose(transpose(X,-7) ,-5) +transpose(transpose(step(X,12) ,-7) ,7) ) ) +transpose(transpose(shuffle(echo(X,4,6) ) ,4) ,12) ) ,7) ) ,-7) ,12) ) ,-5) +transpose((((((transpose((((transpose(X,-7) +transpose((step(X,12) |echo(X,4,6) ) ,4) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) +transpose(echo(step((((X+transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) ,12) ,4,6) ,12) ) ,4) +transpose(((step(arpeggio((X+transpose(X,12) ) ) ,12) +transpose(step(((echo(X,4,6) +transpose(shuffle((X+step(X,12) ) ) ,4) ) +transpose((((transpose(X,-7) +transpose(X,7) ) +transpose(X,4) ) +transpose((arpeggio(X) |(X+transpose(X,7) ) ) ,7) ) ,7) ) ,12) ,4) ) +transpose(arpeggio(transpose(((shuffle(X) +transpose(X,12) ) +transpose(X,4) ) ,4) ) ,7) ) ,12) ) |transpose(transpose(transpose(arpeggio(((X+transpose(X,12) ) +transpose(arpeggio(X) ,7) ) ) ,-7) ,-5) ,-5) ) |((shuffle(transpose(shuffle(((echo(X,4,6) +shuffle(X) ) |(X+transpose(transpose(X,4) ,12) ) ) ) ,4) ) +transpose(arpeggio(transpose(((X+transpose(X,7) ) +transpose(step(X,12) ,12) ) ,4) ) ,4) ) +transpose(arpeggio((shuffle(step(step(X,12) ,12) ) +transpose(arpeggio(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-5) ) ,12) ) ) ,7) ) ) +transpose((step((transpose(shuffle(echo(transpose(X,-7) ,4,6) ) ,-5) +transpose(arpeggio(shuffle(arpeggio((((((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) |shuffle(transpose(X,-7) ) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose(step(step(echo(X,4,6) ,12) ,12) ,7) ) ) ) ) ,12) ) ,12) +transpose(shuffle((step(((echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) +transpose(step(((transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) ,4) +transpose(((step(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose((step(shuffle(X) ,12) +transpose((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) ) ,7) ) ,12) +((transpose(transpose(X,-7) ,4) +transpose(((X+transpose(X,7) ) |echo(X,4,6) ) ,12) ) +transpose(transpose(transpose(shuffle((transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,7) ) ,-5) +transpose(shuffle((((X+X) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,12) ) ) ,-5) ,-7) ,12) ) ) ) ,12) ) ,12) ) +transpose(echo(arpeggio(echo((((((transpose((X+transpose(X,12) ) ,-7) +transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,7) ) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +((((X+X) +transpose(X,12) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ) +transpose(step(step(transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose(step((X+transpose(X,12) ) ,12) ,12) ) ,-5) ,12) ,12) ,12) ) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ) ,7) ) ,4,6) ) ,4,6) ,12) ) ,12) ) ,4) ) +transpose(step(echo((transpose(shuffle((((((X+transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4,6) ,-7) ) |arpeggio((transpose(X,-7) +transpose(echo((transpose(X,-5) +X) ,4,6) ,12) ) ) ) ) ,-7) +transpose(transpose((((arpeggio(transpose((X+transpose(X,7) ) ,-7) ) +transpose(((step(X,12) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) +transpose(((transpose((X+transpose(arpeggio(X) ,12) ) ,-7) |((((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,7) ) ) +transpose(transpose((((X+X) +transpose((step(X,12) +transpose(arpeggio(X) ,12) ) ,12) ) |X) ,-5) ,12) ) ,4) ) +transpose(((shuffle(echo(step(transpose((X|X) ,-5) ,12) ,4,6) ) +transpose(transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,-7) ,4) ) +transpose((transpose(X,4) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,7) ) ,12) ) ,7) ) ,7) ) ,4) ,12) ) ,4,6) ,12) ,7) ) ,7) ) ,-7) ,4,6)
random seed used was 72222346

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