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 20 generations the expression "X" became this:
((arpeggio(transpose(transpose((echo(arpeggio((shuffle(((((echo(X,4,6) +transpose((X|transpose(X,4) ) ,12) ) |transpose(transpose(X,-7) ,-5) ) +transpose((transpose(X,-5) +transpose(transpose((X+transpose(transpose(X,-7) ,7) ) ,-5) ,12) ) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ) |transpose(transpose(transpose(echo(step(transpose(echo(X,4,6) ,4) ,12) ,4,6) ,-5) ,-5) ,-7) ) ) ,4,6) +transpose(transpose(echo(arpeggio(shuffle((transpose(X,-7) +transpose(transpose(echo((X+transpose(transpose(X,-5) ,12) ) ,4,6) ,-5) ,12) ) ) ) ,4,6) ,-5) ,12) ) ,4) ,-5) ) +transpose(transpose((transpose((((step(shuffle((X+transpose(X,12) ) ) ,12) +transpose((step(X,12) |arpeggio(transpose(transpose(transpose(X,4) ,-5) ,-7) ) ) ,7) ) +(shuffle(echo(transpose(X,-5) ,4,6) ) +transpose(((transpose((echo(X,4,6) |echo(X,4,6) ) ,-5) |(X+(shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) ) ) +((transpose(X,-5) |X) |(step(X,12) +X) ) ) ,7) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(transpose(((echo(X,4,6) +transpose(transpose(X,4) ,7) ) +transpose(echo(X,4,6) ,7) ) ,-5) +((transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,4) +transpose(transpose((transpose((X|X) ,4) +(X|transpose(X,4) ) ) ,-5) ,4) ) +transpose(transpose((transpose(X,4) +X) ,-7) ,7) ) ) ) ,7) ) ,4) |step(((transpose((((((X|X) +transpose((X+X) ,4) ) +(transpose(transpose(transpose(X,-5) ,4) ,-5) +arpeggio(X) ) ) +transpose((transpose((X+transpose(X,7) ) ,-5) +transpose((X+X) ,4) ) ,12) ) +transpose(echo((transpose((X|arpeggio(X) ) ,-7) +transpose((X|X) ,-7) ) ,4,6) ,12) ) ,-7) +(shuffle(step((transpose(transpose((shuffle(X) +transpose(X,7) ) ,4) ,4) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose(step(((((((X+transpose(step(shuffle(X) ,12) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +(arpeggio(X) +(X+(X|X) ) ) ) +transpose(transpose(((X|X) +transpose((X+transpose(X,12) ) ,4) ) ,-7) ,7) ) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose(transpose((transpose(arpeggio((X+X) ) ,-5) +transpose((shuffle(X) +transpose(shuffle(X) ,7) ) ,7) ) ,-5) ,7) ) ,12) ,12) ) ) +transpose(transpose(shuffle(((arpeggio(transpose((((X+transpose((X|X) ,4) ) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,7) ) +transpose((echo(transpose(X,-7) ,4,6) +(transpose(X,-5) |X) ) ,7) ) ,-7) ) |step((((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |(X+transpose(X,12) ) ) ,12) ) +shuffle(transpose((echo(X,4,6) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) ,-5) ) ) ) ,4) ,12) ) ,12) ) ,-5) ,-7) ) +transpose((transpose((transpose(transpose(echo(transpose(((((transpose((((X|echo(X,4,6) ) +((X|(X+X) ) +transpose(transpose(X,-5) ,-7) ) ) +transpose(step((transpose(X,4) +(X+X) ) ,12) ,12) ) ,-7) +transpose(((((transpose((arpeggio(X) |((X+transpose(X,12) ) +X) ) ,-7) +transpose(step(arpeggio(X) ,12) ,4) ) +transpose(transpose(((X+X) |(X|X) ) ,4) ,7) ) |transpose((transpose(X,-7) |shuffle(shuffle((X|X) ) ) ) ,-5) ) +echo(transpose((shuffle(X) +X) ,-7) ,4,6) ) ,7) ) +transpose(echo((transpose(((X+X) +transpose(transpose(X,4) ,-5) ) ,4) +transpose(shuffle(shuffle(step(X,12) ) ) ,12) ) ,4,6) ,4) ) +transpose(((((transpose(transpose(X,4) ,-7) +transpose((transpose(((transpose(X,-7) |echo(X,4,6) ) +transpose(transpose(X,-7) ,7) ) ,-5) +transpose((echo((X|arpeggio(X) ) ,4,6) |(shuffle(X) |transpose(X,-5) ) ) ,12) ) ,4) ) +transpose((transpose((((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +transpose(((X+X) |(X+transpose(X,7) ) ) ,7) ) ,-7) +transpose(transpose(((X+transpose(X,12) ) |X) ,-7) ,12) ) ,7) ) |(transpose(((X|step(X,12) ) +transpose((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,-7) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ) |((((transpose(X,4) +transpose(((shuffle(X) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) |(shuffle(X) +transpose(X,12) ) ) +transpose(((echo((X+X) ,4,6) +transpose((X+transpose(X,12) ) ,-7) ) +(arpeggio(transpose(transpose(X,-5) ,-7) ) +transpose(echo((X|X) ,4,6) ,7) ) ) ,7) ) ) ,7) ) |arpeggio((transpose(transpose(echo(transpose(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X|X) ,7) ) |transpose(arpeggio(X) ,4) ) ,-5) ,4,6) ,-5) ,-7) +transpose(transpose((((arpeggio(X) |X) +transpose(transpose(shuffle(((X|X) +transpose(X,4) ) ) ,4) ,4) ) +transpose(echo((transpose(X,4) |((transpose(X,4) +transpose((X|X) ,12) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4,6) ,7) ) ,-5) ,12) ) ) ) ,-5) ,4,6) ,4) ,4) +(transpose(arpeggio((transpose((echo(X,4,6) |transpose(X,4) ) ,-7) +transpose(step(((X|step(transpose(X,4) ,12) ) +transpose(step((X|X) ,12) ,12) ) ,12) ,-5) ) ) ,4) |transpose((transpose((((shuffle(transpose(X,-5) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(echo(echo(transpose(X,-5) ,4,6) ,4,6) ,7) ) +transpose((echo(shuffle(X) ,4,6) +transpose(step((X|X) ,12) ,7) ) ,-5) ) ,-7) +transpose(transpose(step(transpose((X+transpose(X,-5) ) ,-5) ,12) ,4) ,12) ) ,-5) ) ) ,-5) +transpose(((((step((transpose(transpose(transpose((X|X) ,4) ,-5) ,4) +transpose((transpose(arpeggio(transpose(transpose(X,4) ,-7) ) ,-7) |arpeggio(transpose(shuffle(shuffle(X) ) ,4) ) ) ,-5) ) ,12) +step(shuffle(transpose((X+X) ,4) ) ,12) ) +transpose((transpose(transpose(step(transpose((X+transpose((X+X) ,12) ) ,-5) ,12) ,-7) ,-5) +transpose(((((transpose(((arpeggio(((X+transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose((X+X) ,4) ) +transpose(((X+transpose(transpose(X,-7) ,7) ) |((X|X) +(X|X) ) ) ,4) ) ,-5) +transpose(transpose((transpose(((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose((arpeggio(X) +X) ,7) ) +transpose(((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +((transpose(X,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,7) ) ,4) +transpose(transpose(X,-7) ,7) ) ,4) ,4) ) +transpose(transpose(transpose((shuffle((transpose(shuffle(X) ,-5) +transpose((X+transpose(arpeggio(X) ,12) ) ,12) ) ) +transpose(transpose((((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,12) ) ,-5) ,12) ) ,-7) ,-7) ,7) ) +transpose((shuffle(step((transpose((X+transpose(X,12) ) ,-5) +transpose(shuffle(step((X+transpose((X|X) ,12) ) ,12) ) ,12) ) ,12) ) |transpose((((X|X) |(X+transpose(X,12) ) ) +transpose(arpeggio(X) ,-5) ) ,4) ) ,4) ) +transpose((((((step(transpose(X,-7) ,12) |(X+transpose(X,-5) ) ) |transpose(step((X+transpose(X,7) ) ,12) ,4) ) +step((transpose(transpose((X+transpose(X,12) ) ,4) ,-7) +(X+transpose(X,4) ) ) ,12) ) +transpose(transpose(transpose((echo(X,4,6) +(X|transpose(X,-5) ) ) ,4) ,-5) ,12) ) |step((transpose(X,-7) |transpose((X|arpeggio(X) ) ,4) ) ,12) ) ,7) ) ,7) ) ,7) ) +transpose(((transpose(arpeggio(transpose((transpose(((X+X) |(transpose(X,-5) +(X+X) ) ) ,-7) |X) ,-7) ) ,-7) +transpose(transpose(((step((step(X,12) +(arpeggio((X+transpose(X,12) ) ) |transpose(((X+X) +shuffle(X) ) ,-5) ) ) ,12) +transpose(((((X+transpose(X,7) ) |echo(((X|X) +transpose(X,7) ) ,4,6) ) |((X+transpose((X|X) ,7) ) +(transpose(arpeggio(X) ,-5) +(X|transpose(X,-5) ) ) ) ) +transpose(echo((transpose((X+(X+X) ) ,-7) +(transpose(X,4) +(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) ) ,4,6) ,7) ) ,12) ) +transpose(transpose((shuffle((((X+transpose(X,12) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ) +(transpose(step(X,12) ,-7) +(transpose(transpose(transpose(X,-7) ,-7) ,-7) +transpose((((transpose(X,-7) +transpose(X,4) ) +transpose(step(X,12) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ,12) ) ) ) ,4) ,12) ) ,-7) ,7) ) |(step(((transpose(transpose((((X+transpose(transpose(X,-7) ,7) ) +(X+X) ) |transpose(X,-7) ) ,4) ,-7) +transpose(arpeggio(arpeggio((((echo(transpose(X,-7) ,4,6) +transpose((shuffle(X) +X) ,4) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) |(X+transpose(X,-7) ) ) ) ) ,4) ) +transpose(transpose(step((transpose(transpose(X,-7) ,-5) +(((X+X) +transpose(X,-5) ) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) ) ,12) ,-5) ,7) ) ,12) +transpose((transpose(step(step(((transpose((shuffle(X) |echo(X,4,6) ) ,-5) +transpose(transpose((((X+transpose(X,7) ) |(X|X) ) +transpose(transpose(transpose(X,-5) ,4) ,12) ) ,-7) ,4) ) +transpose((echo((transpose(X,-5) +transpose(X,-7) ) ,4,6) +transpose(transpose((transpose(X,4) |echo(X,4,6) ) ,-5) ,12) ) ,7) ) ,12) ,12) ,4) +transpose(transpose((transpose((((transpose((X+X) ,4) +transpose(step((X+shuffle(X) ) ,12) ,4) ) +transpose(transpose((X|X) ,-5) ,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,-7) |transpose(echo(arpeggio(transpose(X,4) ) ,4,6) ,-5) ) ,-7) ,-5) ) ,12) ) ) ,12) ) |echo((transpose(transpose((((transpose(step((transpose(X,-7) |arpeggio(X) ) ,12) ,-5) |transpose(((transpose(X,-5) |transpose(X,4) ) |transpose(X,4) ) ,-5) ) +transpose(step((transpose(X,4) +((X+X) |transpose(X,4) ) ) ,12) ,-7) ) +transpose((((((echo(X,4,6) +transpose((((X|X) +transpose((X|X) ,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(X,7) ) +transpose((X|transpose(X,-5) ) ,4) ) +transpose(transpose((((((X+X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ,7) ) |transpose(transpose(shuffle(transpose((X+transpose(X,12) ) ,-5) ) ,-5) ,-7) ) ,4) ) ,-5) ,-5) |(((shuffle((((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose((transpose((X+transpose(X,12) ) ,-7) |transpose(transpose(X,4) ,4) ) ,-7) ,4) ) +transpose(step(transpose(echo(transpose((X+X) ,-7) ,4,6) ,4) ,12) ,7) ) +echo(echo(((X+transpose(X,7) ) +(X|X) ) ,4,6) ,4,6) ) ) +transpose(arpeggio((((((X+transpose(transpose(transpose(X,4) ,-5) ,7) ) |(echo(X,4,6) |shuffle((X+transpose(X,12) ) ) ) ) +transpose((transpose((transpose(X,-5) +X) ,-5) +arpeggio(transpose(X,-5) ) ) ,4) ) +transpose(arpeggio((X+transpose((X|X) ,12) ) ) ,7) ) +transpose(echo((arpeggio(arpeggio(X) ) |transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) ) ,4,6) ,12) ) ) ,12) ) +transpose((step((transpose((((step(X,12) +step(X,12) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) +transpose(((transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) ,-5) +transpose(((transpose((X+X) ,-7) +transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) ,7) ) ,4) ) +transpose((echo((X+transpose(X,12) ) ,4,6) |(X+X) ) ,7) ) ,7) ) ,4) |(transpose((X+transpose((X+X) ,-7) ) ,4) +transpose(transpose(shuffle(transpose(X,4) ) ,4) ,12) ) ) ,12) +transpose((step(((arpeggio(X) |transpose(X,-5) ) |transpose((((X+X) +transpose((X|transpose(X,-5) ) ,12) ) +transpose(transpose(shuffle((X+X) ) ,-5) ,7) ) ,4) ) ,12) +transpose((((transpose((arpeggio(echo(X,4,6) ) +transpose((step(transpose(X,-7) ,12) |(X|X) ) ,12) ) ,-7) +transpose(transpose((transpose(X,4) +(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose(X,-5) ,7) ) ) ,-5) ,12) ) +transpose(transpose(shuffle(transpose((X|transpose(X,-5) ) ,-5) ) ,-7) ,4) ) +transpose(echo((((((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) |transpose(transpose(X,-7) ,-7) ) +transpose(transpose((X+X) ,-7) ,12) ) +transpose(transpose((transpose(X,-7) +X) ,-7) ,4) ) +transpose((transpose(transpose(X,-5) ,-5) |arpeggio((X+X) ) ) ,7) ) ,4,6) ,7) ) ,12) ) ,7) ) ,4) ) +transpose(echo((((transpose(transpose(((((X|X) +transpose(shuffle(X) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) +transpose(transpose(X,-5) ,12) ) ,4) ,-5) +transpose((transpose(((transpose(X,-5) |transpose(X,-7) ) +transpose(transpose(X,4) ,12) ) ,-5) |(transpose((X+X) ,-5) |((X+arpeggio(X) ) +transpose(X,12) ) ) ) ,4) ) +transpose(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(echo(((echo(echo(X,4,6) ,4,6) +transpose(transpose(shuffle(echo(X,4,6) ) ,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,-5) ,7) ) ,4,6) ,7) ) ) ,4,6) ) ,7) ) ,7) )
random seed used was 234543892

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