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(((((((X|(X+transpose(echo(X,4,6) ,7) ) ) |((transpose(X,-5) |transpose(X,4) ) +transpose((X+X) ,12) ) ) +transpose((X+X) ,12) ) +((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose((((X|X) |X) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,7) ) ,7) ) ) |transpose(transpose(transpose(transpose(X,4) ,-7) ,4) ,4) ) +transpose(echo(((echo(transpose(transpose((step(arpeggio(X) ,12) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,4) ,4) ,4,6) +((transpose(X,-5) |transpose(step(X,12) ,-7) ) |(shuffle(echo(X,4,6) ) +step(step(X,12) ,12) ) ) ) +transpose(echo(transpose((((echo(X,4,6) |X) +transpose(transpose(X,-7) ,7) ) |echo((transpose(X,-7) |X) ,4,6) ) ,4) ,4,6) ,12) ) ,4,6) ,12) ) ,-7) ,-7) ,-5) +transpose(echo(transpose(((shuffle(transpose((transpose(X,4) |(((X|X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) ,4) ) |(echo((transpose(X,-5) +(step((X+X) ,12) +transpose(shuffle(transpose(X,4) ) ,12) ) ) ,4,6) |(step(X,12) +transpose((transpose((X+step(X,12) ) ,-7) +transpose((X+transpose(X,12) ) ,4) ) ,7) ) ) ) +transpose(shuffle((arpeggio(transpose((X|X) ,-5) ) |transpose(arpeggio(transpose((X|(X+X) ) ,4) ) ,-5) ) ) ,12) ) ,4) ,4,6) ,4) ) +transpose(((transpose((arpeggio(shuffle(((transpose((((X+transpose(X,7) ) +transpose(X,7) ) +(X|shuffle(X) ) ) ,-7) |transpose((X+X) ,-7) ) +(echo(transpose(echo(X,4,6) ,4) ,4,6) |transpose((echo((X+transpose(X,12) ) ,4,6) +(X+transpose(transpose(X,4) ,12) ) ) ,4) ) ) ) ) +step(transpose((transpose((shuffle(transpose(X,-7) ) +transpose(((X|X) |shuffle(X) ) ,-5) ) ,-5) |((X+transpose(X,7) ) +transpose(arpeggio(((X+transpose(X,7) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ) ,7) ) ) ,4) ,12) ) ,-7) +transpose(arpeggio((((((((transpose(X,4) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ,4) ) +transpose((step(X,12) +transpose(X,7) ) ,7) ) |((transpose((shuffle(X) +transpose(X,12) ) ,-7) +step(X,12) ) |((X|X) |X) ) ) |((transpose((echo(X,4,6) +(X+X) ) ,-5) +transpose(((((X|X) +arpeggio(echo(X,4,6) ) ) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) +((transpose(transpose(X,4) ,-7) +transpose((((X|X) |transpose(X,-7) ) +((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,4) ) +transpose(echo(transpose((X|X) ,4) ,4,6) ,7) ) ) ) +transpose((((echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) +transpose(transpose((((X+transpose(X,7) ) +transpose(X,7) ) +transpose(transpose(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ,-7) ,7) ) ,-5) ,4) ) +transpose((((X+transpose(transpose(transpose(X,-7) ,-7) ,12) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ) +transpose(transpose((X+transpose(X,4) ) ,-5) ,7) ) ,7) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose(transpose(transpose(transpose(X,-7) ,-7) ,-7) ,7) ) +transpose((transpose(((transpose(transpose((X+X) ,-5) ,-7) |((X|(X+X) ) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) ) |transpose(transpose(((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,-5) ,-7) ) ,-7) +transpose(transpose(arpeggio(transpose((X+X) ,-5) ) ,-5) ,12) ) ,7) ) ) ,12) ) |transpose(((transpose((transpose(X,-5) +transpose(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) ,7) ) ,4) +transpose(((((((X|X) +transpose(transpose((X|X) ,-7) ,7) ) +transpose(X,-5) ) +shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) +transpose(arpeggio(X) ,-5) ) ) ) |arpeggio(transpose((X+transpose(X,12) ) ,-7) ) ) +transpose((((transpose(transpose(X,4) ,-7) |step(transpose((X+X) ,4) ,12) ) +transpose((step((transpose(X,-5) +transpose(shuffle(X) ,12) ) ,12) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-7) ,7) ) ,4) ) +transpose(shuffle(((step(arpeggio(X) ,12) |(X|X) ) +shuffle((X+transpose(X,4) ) ) ) ) ,7) ) ,12) ) ,12) ) +transpose((transpose(((transpose((X+transpose(X,7) ) ,4) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((transpose(transpose(X,4) ,-7) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-7) ,7) ) ,7) ) ,-5) +transpose(transpose((((((step(transpose(X,-7) ,12) +transpose(X,7) ) |X) +transpose(arpeggio(shuffle(transpose(X,-5) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(((X|X) |transpose((X+transpose(X,7) ) ,-7) ) ,-7) ,7) ) ,4) ,12) ) ,-7) ) ,4) ) ,7) )
random seed used was 1367631 EXPR = ((((transpose(((((X|X) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,4) ,7) ) +(shuffle(arpeggio(((transpose((X+transpose(X,12) ) ,-7) |transpose((X+transpose(X,7) ) ,-5) ) +arpeggio(X) ) ) ) +transpose(step((transpose(transpose(X,4) ,-5) +transpose((shuffle(shuffle(shuffle(X) ) ) |arpeggio(transpose((X+transpose(X,7) ) ,-7) ) ) ,7) ) ,12) ,12) ) ) ,4) +transpose(transpose(transpose(transpose(((shuffle(arpeggio(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ) ) +shuffle(((arpeggio(transpose(X,-7) ) +echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ) |transpose((X|(X+transpose(X,12) ) ) ,-7) ) ) ) +transpose((transpose(X,-7) +transpose(((transpose((X+transpose(X,12) ) ,-7) |transpose(echo(X,4,6) ,-5) ) +step(step(X,12) ,12) ) ,7) ) ,12) ) ,4) ,-5) ,-5) ,4) ) +transpose((((transpose(((transpose(step(transpose((X+X) ,-5) ,12) ,-7) |(arpeggio(X) +shuffle(X) ) ) |(step((X+transpose(X,12) ) ,12) |transpose((transpose(transpose(X,-5) ,-5) +transpose(X,12) ) ,-5) ) ) ,-7) +shuffle((echo(((X+transpose(X,12) ) +transpose((transpose(X,4) +transpose(step(X,12) ,12) ) ,7) ) ,4,6) |(transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) ) ) ) +transpose(transpose(transpose(transpose(transpose(echo(((X|X) +transpose(((X+X) |step(X,12) ) ,12) ) ,4,6) ,-7) ,-7) ,4) ,-5) ,4) ) +transpose((((transpose((shuffle(step(echo(X,4,6) ,12) ) +transpose(transpose((echo(X,4,6) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) ,4) ,7) ) ,-7) +transpose(((transpose((transpose(X,-5) |(X+transpose(X,12) ) ) ,-5) +transpose(echo(transpose(X,4) ,4,6) ,4) ) |shuffle(X) ) ,12) ) +(transpose(echo(transpose(X,-5) ,4,6) ,-5) +transpose(transpose(X,4) ,-7) ) ) +((transpose(((transpose(X,4) |step(transpose(X,-7) ,12) ) +transpose(transpose(X,-5) ,12) ) ,-7) +shuffle((transpose(((transpose(X,-5) +transpose((transpose(X,-5) |transpose(X,-7) ) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ,-7) |((transpose(transpose(step(X,12) ,4) ,-5) +transpose((transpose(X,-5) |(((X+X) |X) |shuffle(X) ) ) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) ) ) ) |arpeggio((transpose(transpose(step(transpose((shuffle(transpose(X,-5) ) +X) ,-7) ,12) ,-7) ,-5) +transpose((arpeggio(transpose((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ,-5) ) |shuffle(transpose((transpose((X|(X+X) ) ,-5) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,4) ) ) ,12) ) ) ) ) ,7) ) ,7) ) |shuffle((step((transpose(arpeggio(X) ,-5) |transpose((transpose(echo(X,4,6) ,-5) +((X+transpose(X,12) ) +X) ) ,-5) ) ,12) +step((((((X+transpose(X,12) ) |echo(arpeggio(X) ,4,6) ) +transpose((step((X+X) ,12) +transpose(step((X|X) ,12) ,7) ) ,12) ) +transpose(echo(transpose(shuffle(X) ,-5) ,4,6) ,4) ) +transpose((((((((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +X) +transpose(((X+(X+transpose(X,12) ) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(((X+X) +arpeggio(X) ) ,7) ) +transpose(shuffle(step((X+transpose(X,7) ) ,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(((X+X) +step(X,12) ) ,12) ) ,12) ) ,12) ) ) ) +transpose((transpose(((step((((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) +((transpose(X,4) +transpose(X,4) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,7) ) ) ,12) +transpose(transpose((step(((X+X) +transpose(transpose(X,4) ,12) ) ,12) |((transpose(X,4) +X) |((X+transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,-7) ,7) ) |((X+transpose(step((X+transpose(X,7) ) ,12) ,12) ) +(transpose((X+X) ,-5) +transpose((X|X) ,-5) ) ) ) ,-5) +transpose(((transpose(transpose((X+transpose(X,7) ) ,-5) ,4) +transpose((transpose((X+transpose(transpose(X,4) ,12) ) ,-5) +(shuffle(X) +transpose(arpeggio(X) ,12) ) ) ,7) ) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-7) ,12) ) ,12) ) ,7) )
random seed used was 0 EXPR = transpose((transpose(transpose((transpose(((((X+X) +transpose((X+transpose(arpeggio((X+X) ) ,12) ) ,12) ) +transpose((X+transpose(echo(step(X,12) ,4,6) ,12) ) ,4) ) +transpose(echo(echo(arpeggio((X+X) ) ,4,6) ,4,6) ,7) ) ,-5) +((((arpeggio(X) +transpose(transpose(X,-7) ,7) ) +transpose(((transpose((X+transpose(X,7) ) ,4) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,12) ) +transpose(arpeggio((transpose((X+transpose(X,12) ) ,-5) +transpose(shuffle(transpose(X,4) ) ,7) ) ) ,4) ) +transpose(((shuffle(step(echo(X,4,6) ,12) ) +transpose(((((X+transpose(echo(X,4,6) ,12) ) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,7) ) |transpose(transpose(transpose(echo(X,4,6) ,4) ,-5) ,-5) ) ,7) ) ) ,-7) ,-5) +transpose(transpose(transpose(transpose(transpose(((echo(transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) ,-5) ,4,6) +((echo(arpeggio(X) ,4,6) +transpose(shuffle(X) ,7) ) +transpose(transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose((((X+X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,-7) ,-5) ,7) ) ) |((((transpose(X,4) +step((X+X) ,12) ) +transpose(echo(transpose(transpose(transpose(X,4) ,4) ,-7) ,4,6) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) ,7) ) +transpose((transpose((X+transpose(X,7) ) ,-5) +transpose(shuffle(transpose(X,-7) ) ,7) ) ,4) ) ) ,-5) ,-5) ,-7) ,4) ,12) ) ,-7)
random seed used was 0 EXPR = (transpose((transpose((((echo(arpeggio((arpeggio(X) +transpose(X,-5) ) ) ,4,6) +transpose(step(echo(((X+X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ,4,6) ,12) ,12) ) +transpose(transpose(step(X,12) ,-5) ,12) ) +((transpose((step(X,12) |X) ,-7) +transpose(transpose(transpose(echo(X,4,6) ,4) ,-5) ,7) ) +(step(((echo(X,4,6) +transpose((transpose(X,4) +transpose(X,12) ) ,4) ) +transpose(X,7) ) ,12) +transpose(step(arpeggio(X) ,12) ,7) ) ) ) ,-5) +echo(shuffle((arpeggio(transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4,6) ) ,-7) +transpose(transpose(transpose((((((transpose(X,-5) +transpose(transpose((((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,4) ) +transpose((((X+X) +transpose(transpose(X,4) ,4) ) +transpose((X|(X+transpose(X,12) ) ) ,7) ) ,7) ) +((X+transpose(X,4) ) +X) ) +transpose(step(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ,12) ,7) ) +transpose((transpose(shuffle(transpose((X+transpose(X,12) ) ,-5) ) ,4) +transpose((transpose(X,4) +(X+X) ) ,-7) ) ,12) ) ,-7) ,-5) ,12) )
random seed used was 0

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