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 15 generations the expression "X" became this:
arpeggio(((((transpose(transpose(arpeggio((transpose(transpose(arpeggio(X) ,-7) ,-7) +transpose((X+transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,-7) ) ) ,-5) ,4) |((transpose((((X|transpose(X,-7) ) +transpose(arpeggio(X) ,12) ) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ,-7) +transpose(transpose(shuffle(shuffle(X) ) ,4) ,12) ) |(transpose(((echo(((X|X) +transpose(transpose(X,-5) ,7) ) ,4,6) +transpose(shuffle(step((X+X) ,12) ) ,12) ) +transpose((transpose(X,-7) |(shuffle((X+transpose(X,12) ) ) +transpose(arpeggio(transpose(X,4) ) ,12) ) ) ,12) ) ,-5) +transpose(transpose(((step(arpeggio(X) ,12) +transpose(shuffle(((arpeggio(X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ) ,12) ) |(step(X,12) +((((transpose(X,4) +(X+X) ) +(X|X) ) +transpose((shuffle(X) |step(X,12) ) ,4) ) +transpose(X,7) ) ) ) ,-7) ,12) ) ) ) |transpose((step(transpose(echo((X|X) ,4,6) ,-5) ,12) +transpose((arpeggio(transpose(X,4) ) +transpose((((step((X+X) ,12) +step(X,12) ) +transpose((transpose(X,-7) +X) ,4) ) +transpose((X+X) ,7) ) ,12) ) ,4) ) ,-7) ) +(transpose(((shuffle((arpeggio((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +(X|X) ) +transpose(transpose(transpose(step(X,12) ,-5) ,4) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ) |((((X+X) |(X|X) ) |transpose(X,4) ) +transpose(((step(X,12) +transpose(X,7) ) |(transpose(X,-7) +transpose(arpeggio(X) ,12) ) ) ,7) ) ) ) +echo((transpose(((X+transpose(X,-5) ) |(transpose(X,4) +X) ) ,-7) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,-5) ,12) ) ,4,6) ) +transpose(transpose(transpose(step(arpeggio(echo(arpeggio(X) ,4,6) ) ,12) ,-5) ,4) ,7) ) ,-7) +transpose(transpose((((((step(step((X|X) ,12) ,12) +transpose((((X+X) +X) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) +transpose(shuffle(shuffle(X) ) ,7) ) ,7) ) |(echo((transpose(X,-7) |shuffle((X|X) ) ) ,4,6) |((X+X) +((X+X) +transpose(transpose(X,-7) ,12) ) ) ) ) +transpose(transpose(transpose((transpose(X,4) +transpose((X+arpeggio(X) ) ,12) ) ,-5) ,-7) ,12) ) +((shuffle(arpeggio(X) ) |transpose((arpeggio(X) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,4) ) |transpose((((step(X,12) |(X|X) ) +transpose(echo(X,4,6) ,7) ) |step(X,12) ) ,-7) ) ) ,4) ,-5) ) ) +transpose(((((((step(((transpose(X,-5) |transpose(X,-7) ) +transpose(echo(arpeggio(transpose(X,4) ) ,4,6) ,12) ) ,12) +(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,-5) ) +transpose(transpose(X,-7) ,7) ) |transpose((((X+transpose(X,7) ) +(transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ) +transpose((shuffle((X|X) ) |transpose(X,4) ) ,12) ) ,-5) ) ) +transpose((transpose((shuffle(transpose(X,4) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-5) +transpose(((transpose(((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,-7) +arpeggio(transpose((X|X) ,-7) ) ) |((step(X,12) +transpose(transpose(X,4) ,12) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) ) ,4) ) ,12) ) +transpose(transpose((step(((((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose((X+X) ,4) ,-7) ,4) ) +transpose((transpose((X+transpose(X,7) ) ,-7) +step(transpose((X+transpose(X,7) ) ,-5) ,12) ) ,7) ) +((echo(transpose(X,-5) ,4,6) +transpose((transpose(X,-7) |(transpose(transpose(X,-7) ,4) +transpose(step(shuffle(X) ,12) ,7) ) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ) ,12) |((transpose(shuffle(X) ,-7) +transpose(echo(shuffle(transpose((X+transpose(shuffle(X) ,7) ) ,-5) ) ,4,6) ,4) ) +transpose((step((arpeggio(X) +transpose((X+transpose(X,12) ) ,12) ) ,12) +transpose(step(transpose((X+transpose(X,-5) ) ,-7) ,12) ,12) ) ,7) ) ) ,-7) ,7) ) +transpose((echo((transpose(transpose((step(X,12) |(X+transpose(X,7) ) ) ,4) ,-5) +transpose(transpose((((X|X) +transpose((X|(X+X) ) ,-7) ) |(((X+transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose((X|X) ,7) ) ) ,4) ,7) ) ,4,6) |arpeggio(transpose(transpose((transpose((echo(transpose(X,-7) ,4,6) +transpose(arpeggio(X) ,12) ) ,-7) +((((X|X) +transpose((X|X) ,7) ) +transpose(echo(arpeggio(X) ,4,6) ,12) ) +step(((transpose(X,-7) +transpose(X,12) ) +X) ,12) ) ) ,4) ,-7) ) ) ,4) ) +transpose(transpose((transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ,-7) ,-5) +transpose(transpose((step(transpose(echo(transpose(shuffle(X) ,-7) ,4,6) ,4) ,12) +transpose((transpose((transpose(X,4) +transpose(X,7) ) ,-5) |(((arpeggio(((X+X) +transpose(X,7) ) ) +transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) |shuffle(arpeggio(shuffle(transpose(X,4) ) ) ) ) ) ,7) ) ,-7) ,7) ) ,4) ,7) ) +transpose(transpose((transpose((shuffle(transpose(arpeggio(transpose(X,-5) ) ,-5) ) +((transpose(transpose(X,-7) ,-7) |transpose(transpose(X,-5) ,-7) ) +transpose(step(((X|X) +transpose(transpose(X,4) ,7) ) ,12) ,12) ) ) ,-7) +transpose(step((echo((transpose((X+transpose(X,7) ) ,4) +echo(X,4,6) ) ,4,6) |shuffle((X+transpose(X,12) ) ) ) ,12) ,7) ) ,4) ,7) ) ,12) ) )
random seed used was 8 EXPR = transpose((((((transpose(transpose(((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose((((transpose(X,-5) +transpose(arpeggio(X) ,12) ) +transpose(((X+transpose(X,12) ) +step(X,12) ) ,4) ) +transpose(X,7) ) ,7) ) ,4) ,-5) |((arpeggio((echo(X,4,6) |(X|X) ) ) +transpose((shuffle(X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,12) ) +arpeggio((((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) +((X+X) +transpose(X,-5) ) ) ) ) ) |((transpose((X|(X+X) ) ,4) +transpose((transpose((X|X) ,-7) +transpose(((transpose(X,-7) +echo(X,4,6) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,7) ) ,7) ) +((X+transpose(((arpeggio(transpose(X,-5) ) +transpose(((transpose(X,4) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) ,4) ) +transpose((transpose(X,4) +transpose((X+X) ,4) ) ,7) ) ) ) +(transpose(transpose((echo(transpose((((X|X) |shuffle(X) ) +transpose((X+X) ,7) ) ,-7) ,4,6) +(arpeggio(((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ) +transpose(X,12) ) ) ,-7) ,-5) +transpose(((shuffle(arpeggio((transpose(arpeggio(step(X,12) ) ,4) |step(arpeggio(((X+transpose(X,7) ) +X) ) ,12) ) ) ) +transpose((((echo((X|X) ,4,6) +transpose((X+X) ,7) ) |((X+X) +transpose(echo(X,4,6) ,7) ) ) +((step((((transpose((X+X) ,-5) +transpose(X,7) ) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(((X|X) +step(X,12) ) ,7) ) ,12) |transpose(transpose(step(transpose(X,-5) ,12) ,-5) ,-7) ) +(echo(X,4,6) |((X+transpose(X,7) ) |((X+X) |(X|X) ) ) ) ) ) ,4) ) +transpose(echo((((transpose(X,-5) +X) |X) +transpose((((X|transpose(X,4) ) +transpose(((X+X) +transpose(X,7) ) ,12) ) +transpose(step(step(X,12) ,12) ,12) ) ,-5) ) ,4,6) ,7) ) ,7) ) ) +transpose(transpose(transpose(shuffle(transpose(((arpeggio(((step(X,12) |transpose(X,-7) ) +transpose((X+X) ,7) ) ) |step(transpose(echo(step(X,12) ,4,6) ,-7) ,12) ) |echo(transpose(step(transpose(X,-7) ,12) ,-5) ,4,6) ) ,-5) ) ,4) ,-5) ,4) ) +transpose(transpose((transpose(step((((arpeggio((X|X) ) +transpose((echo(echo(X,4,6) ,4,6) |(transpose(X,-5) |X) ) ,4) ) +transpose((((X+transpose(X,7) ) +X) +transpose((shuffle(X) +transpose(X,12) ) ,7) ) ,7) ) +(((X+transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose(X,4) ,4) ) +transpose(((echo(transpose(X,-7) ,4,6) +transpose(((X+X) +transpose((X|X) ,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ,12) ,4) +transpose(transpose(step((X+transpose(X,7) ) ,12) ,-7) ,7) ) ,-5) ,7) ) ,-5)
random seed used was 0 EXPR = (((transpose(transpose((step(X,12) |(X|X) ) ,4) ,-7) +(((((echo(((X+X) +transpose(X,12) ) ,4,6) +transpose(transpose(transpose(transpose(X,-7) ,-7) ,-5) ,12) ) +transpose(X,12) ) |(((X+transpose(echo(transpose(X,4) ,4,6) ,12) ) +transpose(step(X,12) ,4) ) +transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,4,6) ,7) ) ) +transpose(((X+transpose(transpose(X,-5) ,7) ) +transpose(transpose(transpose(transpose((arpeggio(X) +transpose(echo(X,4,6) ,7) ) ,-5) ,4) ,-5) ,7) ) ,4) ) +transpose((((((transpose(echo(X,4,6) ,-7) +transpose((step(X,12) +shuffle(X) ) ,4) ) +transpose(transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(step(X,12) ,7) ) ,-5) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,4) ) +transpose((((((X+transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +transpose(((transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) +transpose(transpose(((step(X,12) +transpose((X+X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ,4) ) +transpose(((X+transpose(X,12) ) |(X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose(step((transpose(transpose(X,4) ,4) +(X|X) ) ,12) ,7) ) ,7) ) |(X+(transpose((X+transpose(X,12) ) ,-5) +transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ) ,7) ) ) +transpose(transpose(transpose(echo(transpose((((step(X,12) +transpose(transpose(X,4) ,12) ) |transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ) +((echo(transpose(transpose(X,-5) ,-7) ,4,6) +transpose(transpose(transpose(shuffle(transpose(X,-7) ) ,-5) ,-7) ,12) ) +shuffle(arpeggio(X) ) ) ) ,4) ,4,6) ,4) ,-5) ,4) ) +transpose(transpose((shuffle(shuffle(transpose(step(transpose(transpose(step(transpose(X,4) ,12) ,4) ,-7) ,12) ,-7) ) ) |(shuffle(transpose((transpose(transpose((X+X) ,-5) ,4) |transpose(X,4) ) ,-5) ) |shuffle(echo(transpose(shuffle(echo(X,4,6) ) ,-7) ,4,6) ) ) ) ,-5) ,7) )
random seed used was 0 EXPR = shuffle(arpeggio(((transpose(echo(X,4,6) ,-5) +transpose(transpose(transpose((((transpose(transpose(X,-5) ,-5) +transpose((transpose((transpose(arpeggio(X) ,4) +transpose(transpose(X,4) ,7) ) ,4) +((transpose(transpose(X,4) ,4) |transpose(X,4) ) +transpose(transpose((X+X) ,-5) ,12) ) ) ,4) ) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) |transpose((echo((transpose(arpeggio(X) ,-7) +transpose((transpose(X,-5) +(X+transpose(X,12) ) ) ,12) ) ,4,6) +transpose((transpose(X,-5) +transpose(X,4) ) ,4) ) ,-5) ) ,-5) ,-7) ,7) ) +transpose(arpeggio(((shuffle((transpose(transpose(X,-5) ,4) +transpose(step(step(X,12) ,12) ,12) ) ) +transpose(transpose(((X+transpose(X,-5) ) +(transpose(X,-5) +transpose(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,12) ) ) ,-5) ,7) ) +transpose(transpose(((transpose(transpose(arpeggio(X) ,4) ,4) +transpose(((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) ,12) ) |shuffle(step(transpose(X,-5) ,12) ) ) ,-5) ,12) ) ) ,12) ) ) )
random seed used was 0

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