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

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