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 19 generations the expression "X" became this:
((arpeggio(shuffle((((transpose((shuffle(transpose(((transpose(X,-5) |X) |X) ,-7) ) +arpeggio(transpose(transpose(X,4) ,-5) ) ) ,4) +transpose((echo(step(transpose(transpose(arpeggio(transpose(X,4) ) ,4) ,4) ,12) ,4,6) +transpose(transpose(transpose(shuffle(transpose(transpose(X,4) ,-7) ) ,-7) ,-7) ,7) ) ,7) ) |((transpose((transpose(transpose(X,-7) ,4) +transpose((echo(transpose(X,-5) ,4,6) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-5) ,12) ) ,12) ) ,4) +transpose(transpose(((shuffle(transpose(X,-7) ) +transpose((transpose(X,-7) |transpose((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) ,4) ) ,4) ) +transpose(transpose(((transpose(X,-7) +X) +transpose(X,4) ) ,-5) ,7) ) ,4) ,12) ) +transpose(((((transpose(((X+transpose(X,12) ) +echo(X,4,6) ) ,-5) +echo(echo(echo((X+X) ,4,6) ,4,6) ,4,6) ) +transpose(((shuffle(X) +(X+transpose(X,7) ) ) |transpose(X,-7) ) ,12) ) +shuffle(((shuffle(X) +transpose(X,12) ) +arpeggio(X) ) ) ) +transpose((transpose(shuffle(arpeggio(X) ) ,-7) |(transpose(transpose((X|X) ,-5) ,-7) +transpose(((transpose(X,4) +transpose(X,-5) ) +((transpose(X,4) +transpose(step(X,12) ,4) ) +transpose((X+X) ,7) ) ) ,7) ) ) ,-7) ) ,7) ) ) +transpose(((transpose((shuffle(transpose(transpose(step(X,12) ,4) ,-5) ) +transpose(transpose(arpeggio(transpose(X,4) ) ,-7) ,4) ) ,4) |transpose(step(step(transpose(echo(X,4,6) ,4) ,12) ,12) ,-7) ) |(transpose(transpose(transpose(X,-5) ,-5) ,-5) +transpose((transpose((((transpose((X+transpose(X,12) ) ,-7) +arpeggio((X|X) ) ) +transpose(transpose((X+(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ,4) ,4) ) +transpose((shuffle(X) +(echo(X,4,6) +transpose(X,-5) ) ) ,7) ) ,4) +(((transpose(transpose(X,-7) ,-5) +transpose((transpose(step(X,12) ,-7) +transpose((((X|X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,4) ) +transpose((transpose((X|X) ,-5) +(X+X) ) ,7) ) +step((arpeggio((X+X) ) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ,12) ) ) ,12) ) ) ,12) ) ) ) +(transpose(echo(((((transpose((X+(X|X) ) ,4) +transpose(transpose(transpose((X|X) ,-7) ,-7) ,4) ) +transpose(arpeggio(((X+transpose(shuffle((X|X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,7) ) +(shuffle((transpose((step(transpose(transpose(X,-7) ,-5) ,12) +transpose((transpose(arpeggio((X+transpose(X,12) ) ) ,4) +transpose(X,7) ) ,7) ) ,-5) |shuffle(arpeggio((transpose(transpose(X,4) ,-5) +transpose((transpose(X,-5) +transpose(X,-5) ) ,12) ) ) ) ) ) +transpose(((transpose(echo(X,4,6) ,-5) +transpose((echo((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,4,6) |transpose(transpose(shuffle(X) ,4) ,-5) ) ,7) ) +transpose(echo((shuffle((X+transpose(X,-7) ) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,7) ) ,7) ) ) +transpose((echo((step((echo(X,4,6) +((transpose(X,-7) +transpose((transpose(transpose(X,-7) ,-5) |(echo(X,4,6) +X) ) ,7) ) +transpose(shuffle(X) ,-7) ) ) ,12) +((transpose(transpose(((X+transpose(arpeggio(X) ,12) ) +transpose(transpose(echo(echo(shuffle(X) ,4,6) ,4,6) ,-7) ,7) ) ,-7) ,4) +transpose(((transpose((X+X) ,-5) +(arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) ) |(arpeggio(X) +shuffle((X|X) ) ) ) ,4) ) +transpose((transpose(X,-5) +(transpose(X,-7) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ) ,7) ) ) ,4,6) +transpose(((step(transpose((transpose(transpose(X,-7) ,-7) |(X|transpose(transpose(X,-7) ,-7) ) ) ,-7) ,12) +transpose(transpose(((X+transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose((X|X) ,7) ) ,4) ,7) ) +transpose(((echo(((X+X) +transpose((transpose(X,-5) +X) ,7) ) ,4,6) |transpose((transpose((X+X) ,4) |shuffle(transpose(((X|X) +(X|X) ) ,-5) ) ) ,-7) ) |(transpose(((((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) |step(X,12) ) +transpose(transpose(((transpose(transpose(X,4) ,-5) +transpose(((X+X) +X) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ,12) ) ,-5) +transpose(echo(transpose(step((transpose(X,-5) +transpose(X,4) ) ,12) ,-5) ,4,6) ,7) ) ) ,12) ) ,7) ) ,7) ) ,4,6) ,4) +transpose(((step((echo((((((transpose(X,4) +echo(X,4,6) ) +(step(shuffle(X) ,12) +transpose(transpose((step(X,12) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ,12) ) ) |((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(echo((((((transpose((X+transpose(X,12) ) ,-7) |echo((X+transpose(X,12) ) ,4,6) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +echo(X,4,6) ) ,4) ) +transpose(echo(transpose((X+transpose(X,7) ) ,4) ,4,6) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(((shuffle((X+transpose(X,12) ) ) +transpose(arpeggio(X) ,4) ) +transpose((shuffle(X) |X) ,7) ) ,7) ) ,4,6) ,4) ) +transpose((transpose(transpose(X,-5) ,-7) +transpose(((((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +((echo(X,4,6) +transpose(X,7) ) +transpose(((X+transpose(X,12) ) +transpose(transpose(shuffle(X) ,-5) ,12) ) ,12) ) ) ,12) ) ,7) ) ,4,6) +transpose(shuffle((transpose((X+transpose(transpose(transpose(X,4) ,-7) ,7) ) ,-5) +arpeggio(arpeggio((X+X) ) ) ) ) ,7) ) ,12) +transpose(transpose(echo(((transpose(X,-7) +(echo(X,4,6) +step(X,12) ) ) |transpose((transpose(X,-5) +X) ,-7) ) ,4,6) ,4) ,4) ) +((shuffle(((arpeggio(transpose(((step(((X+transpose(X,12) ) |transpose(X,-7) ) ,12) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,4) ) +transpose((transpose(X,-5) |(X+transpose(X,12) ) ) ,7) ) ,-7) ) +transpose(step(((((transpose(X,-5) +transpose(transpose(((X|X) +transpose(X,12) ) ,4) ,4) ) +transpose((X+transpose(X,4) ) ,7) ) +transpose(transpose(shuffle(((X+transpose(X,12) ) +transpose(X,12) ) ) ,-5) ,12) ) +echo(arpeggio(transpose(X,-7) ) ,4,6) ) ,12) ,4) ) +transpose((step((X|((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) +transpose((arpeggio(arpeggio(((echo(arpeggio(transpose(X,4) ) ,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(transpose((X+X) ,4) ) ,7) ) ) ) +transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((echo(X,4,6) |((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ) ,12) ) ,7) ) ,7) ) ) |(transpose(transpose(transpose((arpeggio(transpose(X,4) ) |(shuffle(X) |arpeggio(arpeggio(X) ) ) ) ,-5) ,4) ,-5) +transpose((transpose((shuffle(((transpose(X,-7) |X) +transpose(X,12) ) ) |(echo(arpeggio(transpose(X,-5) ) ,4,6) +(step(X,12) +transpose((X|X) ,12) ) ) ) ,4) +transpose((((echo(X,4,6) +X) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose(transpose(shuffle(arpeggio(transpose(X,-5) ) ) ,-5) ,7) ) ,12) ) ,12) ) ) +step(((transpose(((X+step(transpose(X,-5) ,12) ) |((transpose(transpose(X,-5) ,4) +transpose(shuffle(shuffle(X) ) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ) ,4) +transpose((arpeggio(((X+X) |((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) |X) ) ) |(((transpose(echo(X,4,6) ,-7) |transpose(X,-7) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) ,12) ) +(arpeggio(transpose(X,-5) ) |echo((X+X) ,4,6) ) ) ) ,4) ) +transpose(step(shuffle((((arpeggio(X) +transpose(arpeggio(X) ,7) ) |(transpose(transpose(X,-7) ,-5) |(X|X) ) ) |(X+X) ) ) ,12) ,7) ) ,12) ) ) ,7) ) ) +transpose(transpose((transpose(((echo(transpose((transpose(echo(transpose(X,-7) ,4,6) ,-5) +transpose(transpose(((X+X) |arpeggio(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ) ) ,4) ,12) ) ,-5) ,4,6) +((echo((transpose((shuffle((transpose(X,4) |transpose(X,-5) ) ) +transpose(step((shuffle(X) +transpose(transpose(X,-7) ,12) ) ,12) ,7) ) ,-7) +((X+transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ) ,4,6) +transpose(((step(step((shuffle((X+transpose(X,7) ) ) |transpose(X,4) ) ,12) ,12) |(transpose(transpose((X|arpeggio(X) ) ,-7) ,-5) +transpose(shuffle(transpose(transpose(transpose((X+X) ,-5) ,-7) ,-5) ) ,7) ) ) +(((transpose((X+transpose((X|transpose(X,-5) ) ,12) ) ,4) +transpose((arpeggio(X) +step(X,12) ) ,12) ) +transpose((transpose(X,-7) +(transpose(X,-7) |(echo(X,4,6) +transpose((X+X) ,12) ) ) ) ,-7) ) +((((step(shuffle(echo(X,4,6) ) ,12) +transpose(echo(step(X,12) ,4,6) ,12) ) |transpose(arpeggio((X+X) ) ,-5) ) |transpose(transpose((X|X) ,4) ,-7) ) +transpose((transpose(((X+transpose(step(X,12) ,4) ) +transpose((X+X) ,7) ) ,4) +transpose(transpose(transpose(echo(X,4,6) ,4) ,4) ,12) ) ,12) ) ) ) ,4) ) +transpose(step((step((echo(X,4,6) +((X+X) |step(X,12) ) ) ,12) +((step(X,12) |shuffle(X) ) +transpose(transpose((((X+transpose(X,12) ) +(X+transpose(X,7) ) ) +transpose(transpose(X,4) ,12) ) ,-7) ,7) ) ) ,12) ,7) ) ) +transpose(echo(transpose(((transpose((transpose(transpose(X,-5) ,-7) +transpose(step(step(X,12) ,12) ,7) ) ,-5) +((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) ,4) +transpose((echo(echo(step(X,12) ,4,6) ,4,6) +transpose(X,12) ) ,4) ) +transpose((transpose(shuffle(transpose(transpose(X,-7) ,4) ) ,-5) +(X|X) ) ,7) ) ) +echo(transpose(((((arpeggio(X) |transpose(X,4) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+shuffle(X) ) ,7) ) +arpeggio(X) ) ,-5) ,4,6) ) ,-7) ,4,6) ,-7) ) ,-7) |transpose(transpose(transpose(shuffle((transpose(echo(transpose(transpose(shuffle(X) ,-7) ,-5) ,4,6) ,-7) +transpose((step(transpose(transpose(X,4) ,4) ,12) +echo(step(X,12) ,4,6) ) ,7) ) ) ,-5) ,-7) ,4) ) ,-7) ,7) )
random seed used was 69443230

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