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:
shuffle((step(shuffle(((echo(transpose(shuffle(shuffle((transpose(X,-5) |step(X,12) ) ) ) ,4) ,4,6) +transpose(echo(((echo(transpose(((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ,4,6) +transpose(transpose((shuffle(X) +transpose(((step(X,12) +transpose(transpose(X,4) ,7) ) |(X+transpose(X,7) ) ) ,7) ) ,4) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ,4) ) +transpose((((step(((step(X,12) +transpose((X+X) ,4) ) +transpose(X,7) ) ,12) +transpose((((X|(X+transpose(X,7) ) ) +transpose((arpeggio((X+transpose(X,12) ) ) +transpose((X+transpose(X,-7) ) ,12) ) ,4) ) +transpose(shuffle(step(X,12) ) ,7) ) ,7) ) |((((((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(X) ) +transpose((step((X+transpose(X,7) ) ,12) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ,7) ) +shuffle(arpeggio(shuffle(X) ) ) ) ) |transpose((((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(((echo(shuffle(transpose(X,-7) ) ,4,6) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose((shuffle(X) +X) ,7) ) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,12) ) +echo((X+X) ,4,6) ) ,7) ) ,-5) ) ,7) ) ) ,12) +transpose((((transpose((((echo(X,4,6) +transpose(step(X,12) ,12) ) +transpose((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose((((echo(X,4,6) +step(X,12) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,7) ) ,-5) +transpose(transpose(transpose(transpose(arpeggio(arpeggio(transpose(((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,-7) ) ) ,-7) ,-7) ,4) ,7) ) +transpose(echo(echo(transpose(arpeggio(arpeggio(transpose(shuffle(X) ,-5) ) ) ,4) ,4,6) ,4,6) ,4) ) +transpose(arpeggio((((X+transpose(transpose(X,4) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose(X,7) ) ) ,7) ) ,-7) ) )
random seed used was 10201 EXPR = step(transpose(step((((((((X|X) +transpose(X,12) ) +transpose(((X+transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ) +transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ,7) ) +transpose(((transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) |X) +(((X+transpose(echo(X,4,6) ,12) ) +transpose(arpeggio(shuffle(X) ) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ) ,-5) ) |((transpose(transpose(step((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,12) ,-5) ,-5) +transpose((((transpose(transpose(X,4) ,4) +transpose((X+X) ,4) ) +transpose(transpose(echo(step(X,12) ,4,6) ,-5) ,7) ) |transpose(X,-5) ) ,4) ) +transpose(((echo(transpose((transpose(X,-7) +transpose(X,12) ) ,-5) ,4,6) +transpose(((step(echo((X+X) ,4,6) ,12) +transpose((X+transpose(arpeggio(X) ,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(step(echo(step(X,12) ,4,6) ,12) ,7) ) ,7) ) ) ,12) ,-7) ,12)
random seed used was 0 EXPR = (((shuffle(step((transpose(transpose(X,4) ,-5) +transpose(X,4) ) ,12) ) +transpose((echo((echo((((transpose(echo(X,4,6) ,4) +transpose(step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,4) ) +transpose(step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,7) ) +(X+arpeggio(X) ) ) ,4,6) |(((((arpeggio(shuffle(shuffle(X) ) ) +transpose(((step(X,12) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,12) ) +transpose(((echo(X,4,6) +echo(X,4,6) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose((transpose(X,-7) +transpose(X,7) ) ,-7) ,7) ) +transpose(((step(step(X,12) ,12) |((step(X,12) +transpose(arpeggio(X) ,4) ) +transpose((X|X) ,7) ) ) |echo(transpose((X+X) ,-7) ,4,6) ) ,4) ) +transpose((echo(transpose(arpeggio(transpose(arpeggio(X) ,-5) ) ,-5) ,4,6) +transpose((shuffle(arpeggio(transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,-7) ) ) |(((((echo(echo(X,4,6) ,4,6) +transpose((X+(X+transpose(X,12) ) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose((arpeggio(X) +X) ,7) ) +transpose(step(((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ,4) ) +transpose(((echo(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) +transpose((X+transpose(echo(X,4,6) ,12) ) ,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) ,7) ) ) ,12) ) ,7) ) ) ,4,6) +transpose(transpose(echo(transpose(((X+transpose(X,7) ) |step(X,12) ) ,4) ,4,6) ,4) ,7) ) ,12) ) |transpose(shuffle((transpose(((echo(X,4,6) +transpose(transpose(echo(step(echo((X+X) ,4,6) ,12) ,4,6) ,-7) ,4) ) +transpose(((((transpose(X,4) +(X+arpeggio(X) ) ) +transpose(((X|shuffle(X) ) +transpose((X+X) ,12) ) ,4) ) +transpose(transpose((step(step(transpose(X,-5) ,12) ,12) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,7) ) |arpeggio(transpose(echo(transpose(step(X,12) ,-7) ,4,6) ,4) ) ) ,7) ) ,-5) |transpose((arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) |echo((X|X) ,4,6) ) +transpose(((X|echo(step(X,12) ,4,6) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,7) ) ) |(step(transpose(shuffle((transpose(X,-7) +(X+transpose(X,12) ) ) ) ,-7) ,12) +transpose(((echo(X,4,6) +transpose((X+transpose(X,-5) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ) ,-5) ) ) ,4) ) +shuffle(((((((((transpose(X,-5) +transpose((step(X,12) +transpose(step(X,12) ,12) ) ,4) ) +transpose((((X|X) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(X,-7) ,7) ) +transpose(((transpose((((shuffle(X) +X) +transpose(transpose(X,-5) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,-7) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) +transpose((shuffle(transpose(transpose(echo(X,4,6) ,-5) ,-5) ) +echo(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ,4,6) ) ,12) ) +transpose(arpeggio(transpose(echo(echo((((transpose(shuffle(X) ,-7) |echo(X,4,6) ) +transpose(((X+transpose(X,12) ) |X) ,4) ) +transpose((transpose(X,4) +(X|X) ) ,7) ) ,4,6) ,4,6) ,-5) ) ,4) ) +transpose(echo(shuffle((((echo((X|X) ,4,6) |shuffle(step(arpeggio(X) ,12) ) ) +transpose(step(((X+transpose((X+X) ,4) ) +transpose((X|X) ,7) ) ,12) ,4) ) +transpose(transpose(transpose((shuffle(X) +shuffle(X) ) ,4) ,4) ,7) ) ) ,4,6) ,7) ) ) )
random seed used was 0 EXPR = ((step((transpose(((((((transpose((X+X) ,-7) +transpose((transpose(echo(X,4,6) ,4) +(echo(X,4,6) +X) ) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) +transpose(transpose(echo(arpeggio(transpose(X,-5) ) ,4,6) ,-7) ,7) ) |shuffle(echo(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ,4,6) ) ) |transpose(transpose(shuffle(step(X,12) ) ,4) ,4) ) |transpose((shuffle(((transpose(transpose(X,4) ,-7) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ) +transpose(echo(echo(transpose(((transpose(X,-5) +transpose(X,12) ) |X) ,4) ,4,6) ,4,6) ,12) ) ,-5) ) ,-7) |shuffle((transpose(echo(echo(transpose(transpose(transpose((X|X) ,4) ,-7) ,-7) ,4,6) ,4,6) ,-7) +echo(((transpose((step(arpeggio(transpose(transpose(X,-5) ,4) ) ,12) +transpose(((((arpeggio(X) +transpose(shuffle(X) ,7) ) +echo(((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ) +transpose(step(echo(X,4,6) ,12) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,4) +transpose(transpose(step(transpose((((transpose(transpose(X,4) ,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +((X+transpose(arpeggio((X+X) ) ,4) ) +transpose(((X+X) +X) ,7) ) ) ,4) ,12) ,4) ,12) ) |step((((transpose(((X|X) +X) ,4) +transpose(echo(X,4,6) ,12) ) +transpose(transpose((((((shuffle(X) +echo(X,4,6) ) |transpose(X,-5) ) +transpose(echo(transpose(shuffle(X) ,-7) ,4,6) ,4) ) +transpose(echo(arpeggio((X|X) ) ,4,6) ,7) ) +transpose((transpose(transpose(X,-7) ,-5) +transpose((X|X) ,7) ) ,12) ) ,-5) ,4) ) +transpose(arpeggio((((transpose(X,-7) |arpeggio(transpose(X,4) ) ) +transpose(((((X|X) +(X|X) ) +transpose((echo(X,4,6) +transpose((transpose(X,-7) |echo(X,4,6) ) ,12) ) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,4) ) +transpose((((transpose(X,-7) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(X) ,7) ) |((X+transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) ) ,7) ) ,12) ) ,4,6) ) ) ) ,12) +transpose(((shuffle(echo(transpose(echo((((step(shuffle(echo(X,4,6) ) ,12) +transpose(shuffle(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,12) ) +transpose(arpeggio(((transpose(X,4) +X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ) ,4) ) +transpose(transpose((echo(X,4,6) +transpose(arpeggio(arpeggio(X) ) ,7) ) ,4) ,7) ) ,4,6) ,-7) ,4,6) ) +transpose(((transpose((((step((echo(transpose((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,-5) ,4,6) +(transpose(echo(step(X,12) ,4,6) ,4) |((((X+transpose(transpose(transpose(X,-7) ,4) ,7) ) +transpose(shuffle(transpose((X|X) ,-5) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +arpeggio(((shuffle(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +(arpeggio(X) +step(X,12) ) ) ) ) ) ) ,12) +transpose((transpose(echo(echo(echo(X,4,6) ,4,6) ,4,6) ,4) +transpose(arpeggio(((transpose(X,-5) +transpose(((echo(echo(X,4,6) ,4,6) +shuffle(X) ) +transpose(transpose(((X+transpose(X,7) ) +arpeggio(X) ) ,4) ,12) ) ,4) ) +transpose(shuffle(echo(((step(X,12) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ) ,7) ) ) ,12) ) ,12) ) +transpose((echo(echo((echo(step((X|(X+transpose(X,12) ) ) ,12) ,4,6) +transpose(shuffle(((shuffle(X) +arpeggio(echo(X,4,6) ) ) |arpeggio(X) ) ) ,12) ) ,4,6) ,4,6) |shuffle((arpeggio(arpeggio((transpose(X,4) +transpose(X,4) ) ) ) +echo(transpose(((arpeggio(X) +transpose(step(X,12) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,4) ,4,6) ) ) ) ,4) ) +transpose((transpose(transpose((step(echo(X,4,6) ,12) |X) ,-7) ,-7) |(echo(transpose(arpeggio(echo(shuffle(X) ,4,6) ) ,-5) ,4,6) +(((transpose(X,4) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,12) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) +transpose(shuffle((X|X) ) ,-7) ) ) ) ,7) ) ,4) +transpose(step((echo(((step(X,12) +transpose(X,4) ) +transpose(transpose((((X|transpose(X,4) ) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,-7) ,7) ) ,4,6) |transpose(arpeggio(((X+transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,-5) ) ,12) ,4) ) +transpose(((step(transpose(echo(((arpeggio(X) +transpose((X|X) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ,-5) ,12) +transpose(transpose(step(((step(X,12) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ,-5) ,4) ) +transpose(((step(step(X,12) ,12) +shuffle(X) ) |arpeggio(shuffle(arpeggio(echo(transpose(X,-5) ,4,6) ) ) ) ) ,7) ) ,7) ) ,4) ) +transpose(step(arpeggio(arpeggio(transpose((arpeggio(X) |X) ,4) ) ) ,12) ,7) ) ,4) ) +transpose((((((echo(transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(transpose(X,-7) ) ,12) ) ,4,6) ,-5) ,4,6) +transpose(echo(((arpeggio((shuffle((X|X) ) |X) ) |step((shuffle(X) +transpose(arpeggio(echo(X,4,6) ) ,12) ) ,12) ) |arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) |echo(step((step(X,12) |shuffle(X) ) ,12) ,4,6) ) ) ) ,4,6) ,4) ) +transpose(((transpose(step(shuffle(X) ,12) ,-5) +echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4,6) ) +((((transpose(echo(X,4,6) ,-7) +step(step(transpose(X,-5) ,12) ,12) ) +transpose(step(transpose(echo(X,4,6) ,-5) ,12) ,4) ) +transpose(((((transpose((X|X) ,-7) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose(transpose(((X|X) +transpose(X,-5) ) ,4) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(step(transpose(((X+transpose((X|X) ,4) ) +transpose((X|X) ,7) ) ,-5) ,12) ,7) ) ,7) ) |(step(((shuffle(arpeggio(X) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,12) +transpose(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ) ) ) ,7) ) +(shuffle(step(((((((X+transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) +echo(X,4,6) ) +transpose(echo(transpose((X+X) ,-5) ,4,6) ,4) ) +transpose(step(((X|X) +(X+X) ) ,12) ,7) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(shuffle(X) ,12) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |arpeggio(transpose(echo((X|X) ,4,6) ,4) ) ) ,7) ) ,12) ) +transpose(transpose(transpose(((transpose((X|step(X,12) ) ,-7) +transpose(transpose(transpose(step(echo(X,4,6) ,12) ,-5) ,-5) ,4) ) +transpose(shuffle(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(X,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ) ,7) ) ,4) ,-7) ,7) ) ) +transpose((transpose((arpeggio(shuffle(echo(((echo(X,4,6) +transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) |transpose(X,-5) ) ,4,6) ) ) +transpose(transpose(transpose(transpose(((shuffle(X) +transpose(arpeggio(X) ,4) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,-5) ,4) ,-7) ,7) ) ,-7) +transpose(arpeggio(((((transpose(echo(X,4,6) ,4) |transpose(X,4) ) |(transpose(X,-5) +transpose((((X+transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ) +transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-5) ,4) ) +transpose(echo(((step((X+X) ,12) +transpose((X+X) ,4) ) +transpose(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(step(X,12) ,7) ) +(transpose(X,4) +X) ) ,7) ) ,4,6) ,7) ) ) ,7) ) ,4) ) +transpose(transpose(arpeggio(transpose(echo(echo(step(transpose(echo(step(X,12) ,4,6) ,4) ,12) ,4,6) ,4,6) ,-7) ) ,-5) ,7) ) ,7) )
random seed used was 0

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