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:
((transpose(transpose((echo(step((transpose(transpose(X,-5) ,-7) |transpose(X,4) ) ,12) ,4,6) +transpose(echo(transpose(transpose(echo(transpose(transpose(X,-7) ,-5) ,4,6) ,-5) ,-5) ,4,6) ,12) ) ,-7) ,4) +(transpose(transpose(step((X|X) ,12) ,-5) ,-5) +transpose(transpose(transpose(transpose(((transpose(X,-7) |transpose(X,4) ) +transpose(X,12) ) ,-5) ,-5) ,4) ,-7) ) ) |echo((transpose(arpeggio((transpose((transpose((X+(X+transpose(X,12) ) ) ,-5) +transpose(X,4) ) ,-7) |transpose(X,-7) ) ) ,-5) +(((shuffle(((((X|X) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X|transpose(X,-5) ) ,7) ) ) |((((X+transpose(X,12) ) |transpose(X,4) ) +transpose((transpose(X,4) |X) ,4) ) +transpose(echo((step(X,12) +transpose(transpose(X,-7) ,12) ) ,4,6) ,7) ) ) +(((shuffle(X) |step((echo(X,4,6) |arpeggio(X) ) ,12) ) +(transpose(transpose(X,-7) ,-5) +shuffle(transpose(X,4) ) ) ) +transpose(transpose((X+echo(((X|X) |(X+X) ) ,4,6) ) ,-5) ,12) ) ) |arpeggio(((((X+transpose(X,7) ) +X) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) |(step(((((X|X) +step(X,12) ) +transpose(transpose(step(X,12) ,-5) ,4) ) +transpose(((X+X) +transpose(X,12) ) ,7) ) ,12) +(transpose(arpeggio((X+X) ) ,-5) +(((X+X) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(X,4) ,7) ) ) ) ) ) ) ) ,4,6) )
random seed used was 7 EXPR = transpose(transpose(((transpose((transpose(transpose(echo(transpose((X+X) ,4) ,4,6) ,4) ,4) |((((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) |transpose(X,-7) ) +transpose(transpose(X,-5) ,-5) ) +transpose(transpose((transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose((X+X) ,-5) ) ,4) +transpose((arpeggio(transpose(X,4) ) +transpose((X|transpose(X,-7) ) ,7) ) ,-5) ) ,4) ,12) ) +(transpose(transpose(transpose(transpose(shuffle((echo(X,4,6) +transpose(X,4) ) ) ,-7) ,4) ,4) ,-7) +transpose(echo(transpose(transpose((X+X) ,-5) ,-5) ,4,6) ,7) ) ) ) ,4) +(((echo(echo(transpose(X,-7) ,4,6) ,4,6) +transpose(arpeggio(echo(echo(X,4,6) ,4,6) ) ,7) ) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ) ,4) ) +transpose((((transpose((X+transpose(X,4) ) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((((arpeggio((X+transpose(transpose(X,-7) ,7) ) ) +transpose(step(X,12) ,7) ) +transpose((transpose(transpose(transpose(X,-5) ,-7) ,-7) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ,12) ) ,7) ) ,4) ) +transpose(((transpose(echo((X+X) ,4,6) ,-5) +transpose(shuffle(((X+transpose(X,7) ) +transpose((X+X) ,12) ) ) ,4) ) +transpose(transpose((transpose(X,-7) +transpose(X,7) ) ,4) ,7) ) ,7) ) ,12) ) +(transpose(transpose((X+X) ,-7) ,-5) +transpose(((step((X|X) ,12) +transpose(transpose(X,4) ,12) ) +transpose(transpose(((X+X) |(X+X) ) ,-5) ,12) ) ,7) ) ) ,7) ) ) +transpose(transpose(arpeggio((step((((echo(X,4,6) +transpose(transpose((transpose(X,-7) +transpose(X,12) ) ,-5) ,4) ) +transpose((X+transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,7) ) +transpose(shuffle((transpose((X+transpose(arpeggio(X) ,7) ) ,-5) +((X+transpose(arpeggio(X) ,7) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) ) ) ,12) ) ,12) +(transpose((transpose(X,-5) +transpose(X,7) ) ,4) +transpose(((X|(X+X) ) |arpeggio(X) ) ,7) ) ) ) ,-7) ,12) ) ,-5) ,4)
random seed used was 0 EXPR = transpose(((transpose((arpeggio(arpeggio(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-7) ,4) ,12) ) +transpose(((arpeggio(X) +transpose((X+transpose(X,4) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose(((transpose(((X+X) +transpose(step(X,12) ,7) ) ,-7) +transpose(((X|X) |transpose(X,4) ) ,4) ) +transpose((X|(X|transpose(X,-5) ) ) ,7) ) ,7) ) +transpose(transpose(((transpose(X,4) |X) +arpeggio(arpeggio((X+transpose(X,7) ) ) ) ) ,-7) ,12) ) ) ) |step(echo(transpose(transpose(((((X+transpose(X,7) ) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose((X|X) ,7) ) |arpeggio(transpose(X,-7) ) ) ,4) ,4) ,4,6) ,12) ) ,4) +transpose(arpeggio((transpose(step(echo(transpose(step(transpose(X,4) ,12) ,-7) ,4,6) ,12) ,-7) +transpose((transpose(((((X+X) |(X|X) ) |echo((X+X) ,4,6) ) +((transpose(echo(X,4,6) ,-5) +transpose((transpose(transpose(X,4) ,4) +(X+transpose(X,7) ) ) ,7) ) |shuffle((X|X) ) ) ) ,-7) +transpose(transpose(((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(X,12) ) ,-7) ,-7) ) ,7) ) ) ,12) ) +transpose(((((transpose(shuffle(transpose((X+transpose(transpose(X,4) ,7) ) ,4) ) ,-5) +transpose((((transpose((transpose((step(X,12) +transpose(((X+X) |X) ,7) ) ,-7) |transpose(X,4) ) ,-7) +transpose(((echo((shuffle(X) |(X|X) ) ,4,6) +transpose(transpose(echo(step(transpose(X,4) ,12) ,4,6) ,4) ,7) ) |transpose((transpose(transpose(transpose(X,4) ,4) ,-7) +transpose((echo(transpose(X,-5) ,4,6) +transpose((X|X) ,4) ) ,7) ) ,4) ) ,7) ) +transpose(((echo(((transpose(shuffle(transpose(transpose(X,4) ,4) ) ,-7) +transpose(((transpose(X,-5) +transpose(transpose(X,4) ,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +(X|echo(step(X,12) ,4,6) ) ) ,4,6) +transpose((transpose(X,-7) +transpose(((transpose(X,-5) |transpose(X,-5) ) +transpose(arpeggio(X) ,12) ) ,-7) ) ,-5) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,12) ) ) +transpose((transpose(transpose(X,-7) ,4) +transpose(((X+transpose(X,-5) ) +transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,-5) ) ,12) ) ,4) ,7) ) ,4) ) +transpose(shuffle(echo(transpose(((transpose(transpose(transpose(X,-5) ,-5) ,-5) |transpose(transpose(X,-5) ,-5) ) |(transpose(X,4) +transpose(((X+X) +transpose(X,12) ) ,7) ) ) ,-7) ,4,6) ) ,7) ) ,12) ) +transpose(transpose(transpose(((transpose(((X|X) +(X+X) ) ,4) +transpose((arpeggio((X|X) ) |transpose(echo(transpose(X,-5) ,4,6) ,4) ) ,12) ) +transpose(step((shuffle(X) +(echo(arpeggio(X) ,4,6) +transpose(X,4) ) ) ,12) ,-7) ) ,4) ,4) ,4) ) +transpose(((arpeggio(transpose(echo((((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ) ) +transpose((((X+X) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(((X+X) |transpose((transpose(X,4) +transpose(X,7) ) ,-5) ) ,7) ) +transpose((transpose(transpose(transpose(X,-7) ,-7) ,-7) +transpose(((transpose(X,4) +(X|X) ) |(transpose(X,-7) +transpose((X+X) ,7) ) ) ,12) ) ,12) ) ,4,6) ,4) ) +transpose(((((((transpose(transpose(X,4) ,-5) +transpose(echo(((X|X) +transpose(X,12) ) ,4,6) ,12) ) +transpose(((X+transpose((X+X) ,7) ) +(X+X) ) ,12) ) |(((transpose(((X+transpose(X,12) ) +X) ,-5) +transpose(transpose(X,-7) ,12) ) +transpose(transpose((shuffle(X) +transpose(X,12) ) ,-7) ,4) ) +transpose(echo((echo(X,4,6) |(X+X) ) ,4,6) ,7) ) ) |step((((echo(X,4,6) +transpose(transpose(X,4) ,12) ) +transpose(echo(X,4,6) ,12) ) +transpose(X,4) ) ,12) ) +transpose(transpose(transpose(transpose(echo(X,4,6) ,-5) ,-7) ,4) ,4) ) +transpose((((((X+X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ,4) ) +transpose((X|X) ,7) ) +transpose(transpose(echo(X,4,6) ,4) ,4) ) |(transpose(transpose((transpose((X+X) ,4) +transpose(((X+X) |transpose(X,-7) ) ,12) ) ,-7) ,-5) |((step(step(X,12) ,12) +(transpose(X,-5) +step(X,12) ) ) +(echo(transpose((X|X) ,4) ,4,6) +(((X+transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose(((echo(X,4,6) +transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) +transpose(((((X+transpose(X,7) ) |transpose(X,-5) ) +transpose((X+transpose(X,4) ) ,4) ) +transpose(((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ,7) ) ,12) ) ) ) ) ) ,7) ) ,4) ) +transpose(((step(((step((X+transpose(X,12) ) ,12) |((X+transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +(((X+transpose(((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ,12) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) +transpose(((transpose((X|X) ,-5) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) ) ) ,12) +transpose((((arpeggio(echo(X,4,6) ) +(transpose(X,4) |arpeggio(X) ) ) |transpose(echo(X,4,6) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ,4) ) +transpose(transpose(transpose(transpose(arpeggio(transpose(arpeggio((((X|X) |(X+X) ) +(transpose(X,4) |X) ) ) ,4) ) ,4) ,4) ,-7) ,12) ) ,7) ) ,4) ) +transpose(echo(((transpose(arpeggio(transpose(((transpose((X+(echo(X,4,6) +(X|X) ) ) ,-5) +transpose(shuffle((arpeggio(X) +(X+transpose(X,12) ) ) ) ,-5) ) +transpose(X,4) ) ,-7) ) ,-5) +transpose(((arpeggio(step(echo(((X|transpose(X,-7) ) +transpose(X,-5) ) ,4,6) ,12) ) +transpose(echo((transpose(transpose(shuffle(arpeggio(X) ) ,-5) ,-7) +transpose((transpose(echo(shuffle(transpose(X,-7) ) ,4,6) ,4) +transpose((X|X) ,7) ) ,-5) ) ,4,6) ,4) ) +transpose((shuffle(transpose((transpose(X,-7) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) ,-5) ) |transpose(arpeggio(transpose((X|((arpeggio(transpose(X,4) ) +transpose(arpeggio(((X+transpose(X,7) ) |transpose(X,4) ) ) ,4) ) +transpose(X,7) ) ) ,4) ) ,4) ) ,7) ) ,4) ) +transpose(echo(((((transpose(transpose(X,4) ,4) +transpose(shuffle(X) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) +transpose(transpose((transpose(X,-7) +transpose(X,-5) ) ,4) ,12) ) +shuffle(transpose(transpose(transpose(shuffle(X) ,4) ,-5) ,-7) ) ) ,4,6) ,7) ) ,4,6) ,7) ) ,7) ) ,-7)
random seed used was 0 EXPR = transpose((echo((((arpeggio(((echo((transpose(X,-5) |step(X,12) ) ,4,6) +transpose(((echo(transpose(X,4) ,4,6) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) ,-7) ) +echo(arpeggio(transpose(X,4) ) ,4,6) ) ) +transpose(shuffle(((transpose((X+transpose(X,7) ) ,-5) +((((X+transpose(X,7) ) |(X+transpose(X,12) ) ) +transpose((X|X) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ) |(((X|X) |(X+X) ) +(((transpose(X,4) |X) +transpose(shuffle((X|X) ) ,4) ) +transpose((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ) ) ,12) ) +(echo(((transpose(transpose((X+X) ,-7) ,4) +transpose(((transpose(X,-7) +X) |step(transpose(X,-5) ,12) ) ,4) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ,4,6) +transpose(transpose(arpeggio(((X+transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(transpose((X|X) ,-5) ,-5) ,12) ) ) ,-7) ,12) ) ) |transpose((transpose(shuffle(step(transpose((arpeggio(arpeggio(X) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,-5) ,12) ) ,-5) +transpose(arpeggio((X+step((X+X) ,12) ) ) ,-7) ) ,-7) ) ,4,6) |((transpose(transpose(((echo(transpose(arpeggio(((X+X) |(X+transpose(X,7) ) ) ) ,-7) ,4,6) +transpose(transpose(transpose(transpose(step((X+transpose(X,7) ) ,12) ,-5) ,-7) ,-7) ,7) ) +((transpose((transpose((echo(shuffle(transpose(X,4) ) ,4,6) +(echo(X,4,6) +transpose((X|X) ,7) ) ) ,4) +transpose(transpose(transpose(arpeggio(echo(X,4,6) ) ,-7) ,-5) ,7) ) ,4) +transpose((shuffle(shuffle(X) ) +((transpose(transpose(X,-7) ,4) +transpose((X+transpose(arpeggio(transpose(X,-5) ) ,12) ) ,4) ) +transpose(arpeggio(step(transpose(X,-7) ,12) ) ,7) ) ) ,4) ) +transpose(arpeggio(arpeggio(echo(transpose(X,-7) ,4,6) ) ) ,7) ) ) ,-5) ,4) +transpose(arpeggio(arpeggio(echo((X+X) ,4,6) ) ) ,4) ) +(((step(((step(transpose(X,-7) ,12) +transpose((echo(transpose(X,-7) ,4,6) |transpose(X,-5) ) ,12) ) +transpose(echo((X+transpose(X,4) ) ,4,6) ,12) ) ,12) +transpose(((((shuffle(X) |((transpose(step(X,12) ,-7) +transpose(transpose(X,-7) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) ) +transpose(transpose(arpeggio(transpose(X,4) ) ,-5) ,7) ) |(transpose(transpose(arpeggio(X) ,4) ,4) +transpose((transpose(X,-7) +transpose(step(X,12) ,7) ) ,12) ) ) +transpose(step(step((step(transpose(transpose(X,4) ,4) ,12) |((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ) ,12) ,12) ,12) ) ,12) ) +transpose(shuffle(echo((transpose(((X+transpose(transpose(X,4) ,12) ) +X) ,-7) +transpose(transpose(arpeggio((transpose(X,-7) +(step(X,12) |transpose(X,-7) ) ) ) ,-7) ,-5) ) ,4,6) ) ,4) ) +transpose(shuffle(arpeggio((transpose(transpose(transpose((X+X) ,-5) ,-5) ,-7) |(((X+transpose(X,7) ) +transpose((transpose(X,-5) +step(X,12) ) ,7) ) |transpose((((X+X) +transpose(X,-7) ) +transpose(transpose(X,-5) ,12) ) ,4) ) ) ) ) ,7) ) ) ) ,-5)
random seed used was 0

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