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:
((((((transpose(shuffle((transpose(((X+transpose(X,7) ) |X) ,-5) +(((shuffle(X) +transpose(echo(X,4,6) ,7) ) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,12) ) |echo(transpose(X,4) ,4,6) ) ) ) ,4) +transpose(transpose(step((transpose(transpose(transpose(X,-5) ,-5) ,-5) |(X+transpose(step(X,12) ,12) ) ) ,12) ,-5) ,4) ) +transpose(shuffle(arpeggio((arpeggio(transpose(shuffle(X) ,4) ) +((transpose(X,4) +transpose(transpose((X|X) ,-5) ,12) ) +((arpeggio(X) +transpose(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose((echo(X,4,6) +transpose(X,7) ) ,-7) ,7) ) ) ) ) ) ,7) ) +transpose((step(step(X,12) ,12) +transpose(shuffle((shuffle((X+transpose((X+X) ,7) ) ) +transpose(((shuffle(X) +transpose((transpose(X,4) |(X|X) ) ,12) ) +(((X+(X+transpose(X,12) ) ) |transpose(X,4) ) +transpose((transpose(X,4) |transpose(X,-5) ) ,12) ) ) ,12) ) ) ,7) ) ,-7) ) +transpose((transpose(transpose(((echo((X|transpose(X,4) ) ,4,6) +transpose(transpose(((X+transpose(shuffle(X) ,12) ) |X) ,4) ,4) ) +transpose(((echo(X,4,6) +transpose(X,-5) ) +transpose((X+transpose(X,12) ) ,-5) ) ,7) ) ,-7) ,-5) +((transpose(transpose(transpose(transpose((X|transpose(X,-7) ) ,-7) ,4) ,4) ,-7) +transpose(transpose(transpose(transpose((shuffle(arpeggio(X) ) +(echo(X,4,6) |(X+transpose(X,-7) ) ) ) ,4) ,4) ,4) ,12) ) +transpose(transpose((arpeggio(((((X+transpose((X|X) ,12) ) |shuffle((X|X) ) ) +transpose(step((X|transpose(X,-5) ) ,12) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ) +transpose(transpose(((X+transpose(transpose(step(X,12) ,-7) ,7) ) +transpose(step(X,12) ,-5) ) ,-5) ,12) ) ,-7) ,7) ) ) ,12) ) +transpose(arpeggio(shuffle(shuffle((shuffle((arpeggio(transpose(transpose(echo(X,4,6) ,-7) ,-7) ) +transpose((transpose(transpose((X|transpose(X,4) ) ,-5) ,-7) +transpose((((X+X) +transpose(shuffle(X) ,12) ) +(transpose(X,-5) |X) ) ,7) ) ,12) ) ) +step(transpose(echo(step(((transpose(X,-7) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ,4,6) ,-7) ,12) ) ) ) ) ,7) ) |echo(transpose(shuffle(transpose(transpose(transpose(transpose((((shuffle(transpose(X,4) ) |X) |(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) +transpose(shuffle(X) ,12) ) ) |arpeggio((transpose(transpose(X,4) ,-7) |transpose(((X|X) +(X+X) ) ,4) ) ) ) ,-7) ,-5) ,-7) ,4) ) ,-7) ,4,6) )
random seed used was 193134571 EXPR = shuffle(echo(transpose((shuffle(((((transpose(step(step((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,12) ,12) ,-7) |((((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +((X+transpose(X,-5) ) |((X+X) +transpose(transpose(X,4) ,12) ) ) ) +echo(((((X+transpose(transpose(X,4) ,7) ) +transpose(X,-5) ) +transpose(((X|X) |(X+transpose(X,7) ) ) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,4,6) ) ) +transpose(((transpose((X|X) ,-5) |transpose((((X+transpose(X,12) ) +(X+X) ) |shuffle(transpose(X,-7) ) ) ,-7) ) |(arpeggio(X) +(arpeggio(X) +transpose(shuffle((X|X) ) ,12) ) ) ) ,7) ) +transpose((arpeggio(arpeggio((X+transpose(X,12) ) ) ) +transpose(transpose(((transpose(transpose((X+transpose(X,12) ) ,-7) ,4) |(shuffle(X) |((X+X) +transpose(shuffle(X) ,12) ) ) ) +transpose(transpose(X,4) ,12) ) ,4) ,7) ) ,4) ) +transpose(step(arpeggio((echo(X,4,6) +transpose(((X|X) |transpose(X,-7) ) ,7) ) ) ,12) ,7) ) ) |transpose(step(echo((transpose(arpeggio((X+transpose(X,12) ) ) ,4) +transpose((shuffle(X) +transpose((X+X) ,12) ) ,12) ) ,4,6) ,12) ,-5) ) ,-5) ,4,6) )
random seed used was 0 EXPR = (transpose(step((transpose(shuffle(echo(transpose(transpose(transpose(transpose((X|X) ,-7) ,-7) ,-5) ,4) ,4,6) ) ,-7) +shuffle(transpose(shuffle(shuffle(transpose(transpose((transpose((shuffle(transpose(X,-7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,4) ,12) ) ,-5) |echo(transpose(shuffle(transpose(X,4) ) ,4) ,4,6) ) ,4) ,-5) ) ) ,-7) ) ) ,12) ,-5) +transpose(shuffle(transpose(transpose(arpeggio(transpose(step(((transpose((((step(((transpose(X,-5) +transpose(transpose(arpeggio(X) ,-5) ,4) ) +transpose(step(transpose((X+transpose(X,7) ) ,-7) ,12) ,7) ) ,12) +transpose(transpose((((X|(X|X) ) +transpose((shuffle(X) +transpose(X,4) ) ,12) ) +transpose(X,-5) ) ,-5) ,7) ) +transpose((echo(step((transpose(transpose(shuffle(X) ,4) ,-5) +X) ,12) ,4,6) |((shuffle(X) +(X+transpose(X,12) ) ) |transpose(transpose(transpose(X,-5) ,-5) ,-7) ) ) ,4) ) +transpose(((X+step(X,12) ) |transpose(transpose(shuffle(X) ,4) ,-7) ) ,7) ) ,-5) +transpose(transpose((echo(((X|shuffle(arpeggio(shuffle(X) ) ) ) +transpose(echo(transpose(((X|X) +transpose(transpose(X,4) ,12) ) ,-7) ,4,6) ,7) ) ,4,6) |(transpose((step(transpose(X,-7) ,12) |transpose((X|transpose((X+transpose(X,12) ) ,-7) ) ,-5) ) ,4) +transpose((transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) ,4) +transpose((shuffle(((echo(X,4,6) |transpose(X,4) ) +transpose(transpose(X,4) ,12) ) ) +transpose(((X+X) +((X+X) |shuffle(X) ) ) ,12) ) ,7) ) ,12) ) ) ,-5) ,4) ) +transpose((transpose(((step(transpose(X,4) ,12) |shuffle(X) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,4) |((transpose(transpose((X+transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,-7) ,4) +transpose(((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,12) ) +transpose(((transpose(X,-7) +X) +(X|X) ) ,4) ) +transpose(((X+X) +transpose(shuffle(X) ,7) ) ,7) ) ,4) ) +transpose(arpeggio((((X|X) +transpose((X+transpose(X,7) ) ,12) ) +(transpose(X,4) +transpose((X+shuffle(X) ) ,12) ) ) ) ,7) ) ) ,7) ) ,12) ,-7) ) ,-7) ,4) ) ,12) )
random seed used was 0 EXPR = ((step((transpose((arpeggio(transpose((shuffle(X) |X) ,4) ) +(((shuffle(transpose(shuffle((X+transpose(transpose((X+transpose(echo(X,4,6) ,7) ) ,-5) ,-7) ) ) ,-5) ) +transpose(transpose(transpose((transpose(X,4) |step(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ,12) ) ,-7) ,-7) ,7) ) +transpose((arpeggio(X) |transpose((echo(shuffle(X) ,4,6) +transpose(transpose((((shuffle(echo(X,4,6) ) +X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,7) ) ,-5) ,7) ) ,-5) ) ,4) ) +transpose(step(shuffle(((X+X) +transpose(shuffle(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ) ,12) ,7) ) ) ,-7) +transpose((step((echo(arpeggio((transpose(echo(X,4,6) ,-7) +transpose(transpose((shuffle(X) +(echo(X,4,6) |(transpose(X,-5) +transpose((X+transpose(X,12) ) ,7) ) ) ) ,-5) ,12) ) ) ,4,6) +transpose((((transpose((transpose(X,-5) +(X|X) ) ,-7) +transpose(shuffle(transpose((transpose((X|X) ,-5) +transpose((transpose(X,4) |X) ,12) ) ,4) ) ,12) ) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) +shuffle(transpose(echo(arpeggio((((step(X,12) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,-7) ) ) ,12) ) ,12) +(arpeggio(((((shuffle(shuffle(((X+X) |echo(X,4,6) ) ) ) |((X+transpose(shuffle((X+transpose(shuffle(X) ,7) ) ) ,7) ) +(((shuffle(transpose(X,-7) ) +transpose(transpose(((X+X) +transpose(step(X,12) ,7) ) ,-7) ,12) ) +transpose((transpose(X,4) +transpose(((echo((X+X) ,4,6) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ) ) +transpose(shuffle(step(((X+transpose((step(X,12) +X) ,12) ) +shuffle(X) ) ,12) ) ,4) ) +transpose(transpose((shuffle((X+transpose(X,7) ) ) |step((X+transpose(X,12) ) ,12) ) ,-5) ,7) ) |(echo((transpose((echo(shuffle(X) ,4,6) +transpose(echo(X,4,6) ,7) ) ,-7) |transpose(transpose(((X|X) +arpeggio(X) ) ,4) ,-5) ) ,4,6) |(((arpeggio((X+transpose(X,12) ) ) +transpose(transpose((((X|X) |transpose(X,-5) ) +transpose(shuffle(X) ,12) ) ,-5) ,4) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) +transpose(transpose(transpose((X+X) ,4) ,4) ,12) ) ) ) ) |transpose(step(transpose(shuffle(transpose((transpose((X+X) ,-7) |X) ,4) ) ,4) ,12) ,-7) ) ) ,12) ) ,12) |(transpose(transpose(transpose(transpose(shuffle(arpeggio(X) ) ,-7) ,-5) ,-5) ,-7) +transpose(transpose(transpose(step(shuffle((transpose(shuffle((((transpose(echo(X,4,6) ,-5) |((X+transpose(X,7) ) +transpose(step(X,12) ,7) ) ) +transpose((step(X,12) +transpose((transpose(X,-7) +((X+transpose(X,12) ) +transpose(X,-5) ) ) ,12) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) ,-5) +shuffle((shuffle(transpose(transpose(transpose(X,-7) ,-5) ,-5) ) +transpose(transpose(X,4) ,-5) ) ) ) ) ,12) ,4) ,4) ,7) ) ) +((shuffle((transpose(transpose(((transpose(transpose(echo((transpose((arpeggio(X) +transpose(shuffle(X) ,12) ) ,4) +transpose(arpeggio(shuffle(step(((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ,12) ) ) ,7) ) ,4,6) ,4) ,4) +transpose(transpose((step((shuffle(transpose((transpose(X,-5) +transpose(step(X,12) ,7) ) ,-7) ) +transpose(echo(X,4,6) ,-7) ) ,12) |((transpose(transpose(X,-5) ,4) +transpose((X+transpose(X,-5) ) ,4) ) +shuffle(transpose(transpose(X,4) ,-5) ) ) ) ,-7) ,4) ) +transpose(transpose((((shuffle((transpose(transpose(transpose(X,-7) ,-7) ,-7) +transpose((shuffle(step(X,12) ) +transpose((X|X) ,12) ) ,12) ) ) +transpose(shuffle((X|transpose(X,4) ) ) ,4) ) +transpose((((transpose((X+X) ,4) +(transpose(X,-5) |shuffle((shuffle(X) +shuffle(X) ) ) ) ) +transpose(((X+transpose(X,-5) ) +(step((X|X) ,12) +((X+X) +X) ) ) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) ,7) ) +transpose((((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose((X|X) ,4) ,7) ) |(((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) +transpose((arpeggio(transpose(X,-7) ) +echo(shuffle(X) ,4,6) ) ,7) ) ) ,12) ) ,-5) ,7) ) ,4) ,-7) +transpose(shuffle(transpose(((arpeggio((((((X+transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) |transpose((X+transpose(X,7) ) ,-7) ) +transpose((arpeggio(X) |transpose(X,4) ) ,4) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ) |echo(echo(transpose(X,-7) ,4,6) ,4,6) ) +shuffle(shuffle(transpose((X+transpose(echo(X,4,6) ,7) ) ,4) ) ) ) ,4) ) ,12) ) ) |transpose((transpose(transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) ,4) ,4) +transpose(transpose(echo((transpose(transpose(transpose(((X|X) |transpose(X,-7) ) ,-7) ,4) ,-5) +transpose(transpose(shuffle(transpose(((((echo(arpeggio(X) ,4,6) +transpose((((X|X) +transpose((X+X) ,12) ) +echo(arpeggio(X) ,4,6) ) ,4) ) +transpose((X|shuffle((X+transpose(X,7) ) ) ) ,7) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose((X|step(X,12) ) ,7) ) ,-7) ) ,-7) ,7) ) ,4,6) ,4) ,12) ) ,4) ) |(arpeggio(((echo(shuffle(((X|X) +shuffle(X) ) ) ,4,6) |(((arpeggio(transpose(transpose(X,-5) ,-7) ) +(arpeggio((transpose((X|X) ,4) +transpose(X,7) ) ) +transpose((X+arpeggio(shuffle(X) ) ) ,-7) ) ) +transpose((((X|transpose(X,4) ) +transpose(((echo(X,4,6) +shuffle(X) ) +transpose(transpose(shuffle(X) ,-7) ,12) ) ,7) ) +transpose(shuffle((X|X) ) ,7) ) ,4) ) +transpose(shuffle(((X+transpose(echo(X,4,6) ,12) ) +(X+((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ) ) ,7) ) ) +transpose(arpeggio(transpose(((transpose(shuffle(transpose((X+transpose(X,7) ) ,-5) ) ,4) |(shuffle(((((X+transpose(X,-7) ) +shuffle((X|X) ) ) +transpose((shuffle(arpeggio(X) ) |(arpeggio(X) +(X+transpose(X,7) ) ) ) ,4) ) +transpose(transpose(step((X+transpose(X,7) ) ,12) ,4) ,7) ) ) +(transpose(X,-5) +X) ) ) +((transpose(transpose((X+transpose(X,4) ) ,-7) ,4) +(transpose((transpose(transpose(X,4) ,-5) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ,4) +transpose(shuffle((X+transpose(transpose(X,-7) ,7) ) ) ,7) ) ) +transpose((transpose(step(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,12) ,-5) +transpose(transpose(step((X+transpose(arpeggio(X) ,7) ) ,12) ,-5) ,12) ) ,7) ) ) ,-7) ) ,7) ) ) +shuffle(transpose(((echo((((transpose(X,4) +transpose(transpose((transpose(X,-7) +(arpeggio(X) |X) ) ,-7) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) |transpose(echo(echo(X,4,6) ,4,6) ,-7) ) ,4,6) +((shuffle((transpose(X,-7) +transpose(X,7) ) ) +transpose(((transpose(X,-7) |transpose(X,4) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ,12) ) |shuffle(X) ) ) +transpose(step((shuffle(shuffle(step(((X+transpose(X,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ,12) ) ) +transpose(transpose(arpeggio(shuffle(X) ) ,-5) ,-5) ) ,12) ,7) ) ,-5) ) ) ) )
random seed used was 0

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