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(transpose((shuffle((((echo(transpose((((transpose(echo(((X+transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ,4,6) ,4) +transpose(transpose((transpose(X,-7) +transpose(step(X,12) ,7) ) ,-7) ,7) ) +transpose(transpose(((((X|X) +transpose((X+transpose(X,7) ) ,7) ) +arpeggio(X) ) +((echo(X,4,6) +transpose((X+X) ,7) ) +transpose(((X|X) |(X+transpose(X,7) ) ) ,12) ) ) ,4) ,7) ) +transpose(shuffle(transpose(((transpose(X,-7) +transpose(transpose(((X+transpose(X,12) ) |X) ,4) ,4) ) +transpose(transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,4) ) ,12) ) ,-7) ,4,6) |transpose(((transpose((transpose((((transpose(X,4) +transpose(echo(X,4,6) ,12) ) +transpose(echo(transpose(transpose(X,4) ,-7) ,4,6) ,12) ) +(transpose(arpeggio(X) ,-7) +transpose(transpose(((X+X) |X) ,-7) ,4) ) ) ,-5) |((transpose((((transpose(X,-7) +transpose(X,12) ) +transpose(echo(step(echo(X,4,6) ,12) ,4,6) ,7) ) +(X+transpose(transpose(X,-7) ,7) ) ) ,-5) +transpose(step(((transpose(transpose(X,-7) ,4) +transpose(transpose(shuffle(transpose((X|X) ,-7) ) ,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ,4) ) +transpose((transpose(arpeggio(echo(transpose((X|X) ,4) ,4,6) ) ,-7) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ,12) ) ,7) ) ) ,-5) +transpose(echo(arpeggio(echo(((X+shuffle(X) ) +echo((transpose(step(X,12) ,4) +transpose(X,12) ) ,4,6) ) ,4,6) ) ,4,6) ,4) ) +transpose(step(shuffle((echo(transpose(transpose(echo(shuffle(X) ,4,6) ,-5) ,-5) ,4,6) |(transpose(((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,4) +transpose(((arpeggio(X) +arpeggio(shuffle(X) ) ) |(((X+X) +X) +X) ) ,12) ) ) ) ,12) ,7) ) ,-7) ) +transpose(step(transpose((((transpose(shuffle((X|X) ) ,-5) |((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose((X|(X+X) ) ,7) ) +(transpose((X+transpose(X,7) ) ,-5) +X) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,4) ) +transpose((((X|X) |arpeggio((X|X) ) ) +((X+X) +transpose((X+transpose(X,12) ) ,-5) ) ) ,7) ) ) +transpose(transpose(((transpose(transpose(X,-7) ,4) +transpose(transpose(X,-7) ,-5) ) +transpose(echo((transpose(X,-7) +echo(X,4,6) ) ,4,6) ,-5) ) ,-7) ,7) ) +transpose((((arpeggio(((X+transpose(X,12) ) +(X+transpose(X,7) ) ) ) +transpose((((transpose((X+transpose(X,12) ) ,4) +transpose(echo((arpeggio(X) |X) ,4,6) ,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,-5) ) |((X+transpose(X,7) ) |X) ) ,4) ) +transpose((transpose(echo(transpose(X,-7) ,4,6) ,-5) |(transpose((X+X) ,-5) +transpose(transpose(X,-7) ,7) ) ) ,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) |((((X|X) +transpose(X,12) ) +transpose((transpose(X,-5) +echo(X,4,6) ) ,12) ) +transpose(((X+(X|X) ) +transpose(transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) ,-7) ,12) ) ,12) ) ) ,12) ) ,4) ,12) ,4) ) +transpose(arpeggio((step(transpose(((transpose((((echo(X,4,6) |(X|X) ) +transpose(transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,4) ) +transpose(((transpose(((X|X) +transpose(transpose((X+X) ,4) ,7) ) ,4) +transpose((step(transpose(X,-7) ,12) |shuffle(X) ) ,4) ) +transpose(transpose(transpose(shuffle((X|X) ) ,4) ,4) ,7) ) ,7) ) ,-7) |transpose((arpeggio((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose((X+(X+transpose(X,7) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) |echo(transpose((X+transpose(X,12) ) ,4) ,4,6) ) ,-7) ) +echo((transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ,-5) +((shuffle(shuffle(X) ) +(X+(X+X) ) ) +transpose(transpose(X,-5) ,12) ) ) ,4,6) ) ,-5) ,12) +(echo((transpose(shuffle(X) ,4) +transpose((((transpose(X,4) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ,7) ) +(((transpose(X,-5) +(X+X) ) +transpose((transpose(X,-5) |transpose(X,-5) ) ,7) ) +transpose(transpose((echo(X,4,6) +transpose(echo(X,4,6) ,7) ) ,4) ,7) ) ) ,7) ) ,4,6) +transpose(((transpose((transpose((X|X) ,-5) |((echo((X+X) ,4,6) +transpose(X,4) ) +transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,7) ) ) ,-7) +transpose((X+transpose((X|(X|transpose(X,-7) ) ) ,7) ) ,-5) ) +transpose(step((((shuffle(X) +transpose((X|X) ,7) ) |transpose(X,-7) ) +transpose(arpeggio((((X+(X|X) ) +transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,12) ,12) ) ,12) ) ) ) ,7) ) ) +transpose(((((echo((step(transpose((transpose((X|X) ,-7) +transpose(echo((transpose(X,-7) +X) ,4,6) ,12) ) ,4) ,12) +transpose(transpose(step(transpose(((((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose((transpose(X,-7) +transpose(X,-5) ) ,7) ) +transpose(((X+X) +(transpose(X,-7) |X) ) ,7) ) ,-5) ,12) ,-5) ,7) ) ,4,6) +transpose(step((echo((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ,4,6) +echo((echo(transpose(transpose(X,4) ,4) ,4,6) +step(transpose(X,-5) ,12) ) ,4,6) ) ,12) ,12) ) +transpose(shuffle((((arpeggio(shuffle((shuffle(transpose(X,-5) ) +transpose(((X+X) |X) ,7) ) ) ) |step(transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ,-7) ,12) ) +transpose(((((arpeggio(echo((X+transpose(X,7) ) ,4,6) ) |transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose(transpose(X,4) ,4) ) |(((((X+transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(echo((X|X) ,4,6) ,7) ) +transpose(((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) +((X+X) |transpose(X,-7) ) ) ) |step((step(transpose(((X+transpose(((transpose(X,-7) +transpose((X|X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(transpose(X,4) ,12) ) ,4) ,12) +echo((transpose(((transpose(shuffle(X) ,4) +transpose((X|(X|X) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) |(transpose(X,-7) +transpose(transpose(X,4) ,-5) ) ) ,4,6) ) ,12) ) ,7) ) +transpose(transpose(((transpose(((arpeggio(arpeggio(X) ) |((((transpose(X,4) +transpose(X,4) ) +transpose((X|X) ,7) ) +transpose(arpeggio(arpeggio(X) ) ,4) ) +transpose(arpeggio((X+X) ) ,7) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) ,7) ) ,4) |echo((step(((transpose(X,-5) +step(X,12) ) +(transpose(transpose(X,-5) ,-7) +transpose((X+transpose(X,7) ) ,7) ) ) ,12) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,-5) ) ,4,6) ) |(shuffle(echo((transpose(((transpose(X,4) +transpose(shuffle(X) ,4) ) +transpose(step(X,12) ,7) ) ,4) +(transpose(X,-5) +((arpeggio(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,7) ) ) ) ,4,6) ) |arpeggio(((transpose(arpeggio(step(X,12) ) ,-5) +transpose(shuffle(X) ,4) ) +transpose(transpose(arpeggio(((step(X,12) +transpose((X+X) ,4) ) +transpose(X,7) ) ) ,-7) ,7) ) ) ) ) ,-5) ,7) ) ) ,4) ) +transpose((transpose((transpose(transpose((step(shuffle(X) ,12) |transpose(transpose(X,-5) ,4) ) ,-5) ,-5) |((((echo(step(transpose(shuffle(X) ,4) ,12) ,4,6) +(transpose(transpose(X,-5) ,-7) +transpose(((X+(X+X) ) +(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) |transpose(X,-5) ) ) ,12) ) ) +transpose(shuffle(step(echo(((X+transpose((X+X) ,4) ) +transpose((X|X) ,7) ) ,4,6) ,12) ) ,4) ) +transpose((((transpose((X|transpose(X,-5) ) ,-7) |(((X+X) +transpose((X+X) ,-5) ) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) ) +transpose(step((X+transpose(X,7) ) ,12) ,-5) ) +shuffle(echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ) ) ,7) ) +echo(((((transpose(X,4) +transpose(echo(X,4,6) ,12) ) +transpose(X,4) ) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +step((X+transpose(X,7) ) ,12) ) ) +transpose(transpose((X+X) ,-5) ,7) ) ,4,6) ) ) ,-7) +(echo((echo(transpose(step(step(X,12) ,12) ,-5) ,4,6) +transpose(transpose((shuffle(transpose(X,4) ) +transpose(transpose((step(X,12) +transpose(step(X,12) ,12) ) ,-7) ,7) ) ,-7) ,7) ) ,4,6) +transpose(((transpose(transpose(echo(echo(echo(X,4,6) ,4,6) ,4,6) ,-7) ,-7) |transpose(echo(transpose(transpose(step(shuffle(X) ,12) ,-7) ,-5) ,4,6) ,-5) ) |(((step(((transpose(transpose(shuffle(X) ,-7) ,-7) +transpose(transpose(step(X,12) ,-7) ,12) ) +transpose(transpose((echo(X,4,6) |transpose(echo(X,4,6) ,-5) ) ,-5) ,7) ) ,12) |transpose((transpose(((X+transpose(X,4) ) +transpose(echo((((X|X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,-7) +transpose(echo(echo(transpose((X|X) ,-5) ,4,6) ,4,6) ,12) ) ,4) ) +transpose((step(transpose(transpose((echo(X,4,6) |((transpose(X,-5) +transpose((X|X) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ) ,4) ,-7) ,12) |((shuffle(((arpeggio(X) +transpose(((X|X) |transpose(X,4) ) ,7) ) |transpose(transpose(X,-7) ,-5) ) ) |((((X|X) +echo((X+transpose(X,7) ) ,4,6) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(arpeggio(shuffle(transpose((X+X) ,-5) ) ) ,7) ) ) +(step((transpose(transpose(X,-7) ,4) +transpose(transpose(echo(echo(X,4,6) ,4,6) ,4) ,7) ) ,12) +transpose(transpose(step(shuffle((X|X) ) ,12) ,-7) ,7) ) ) ) ,4) ) +transpose(((((((transpose(transpose(((X+transpose(X,7) ) +X) ,4) ,-7) +transpose((shuffle(X) |transpose(step(X,12) ,-5) ) ,4) ) +transpose(shuffle(((X|X) +arpeggio(X) ) ) ,7) ) +transpose(((((X+transpose(X,7) ) +transpose((X|X) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,7) ) |shuffle(transpose((X|X) ,-7) ) ) ,12) ) +transpose((transpose(transpose(X,-5) ,4) +transpose(((X+transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-5) ) +transpose(transpose(transpose(((transpose(step(X,12) ,4) +((X+X) +(X+transpose(X,7) ) ) ) +transpose((arpeggio(transpose(X,-5) ) +transpose((X+X) ,7) ) ,12) ) ,4) ,-7) ,4) ) +transpose(transpose(((transpose(step(X,12) ,-7) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(shuffle(X) ,4) ,12) ) ,-5) ,7) ) ,7) ) ) ,12) ) ) ,7) ) +transpose((step(((step(echo((transpose(X,-5) +transpose((X|X) ,12) ) ,4,6) ,12) +transpose(step((((transpose((echo(X,4,6) |X) ,-5) |transpose(transpose(X,4) ,-5) ) +(transpose(X,-7) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ,12) ) ) |transpose(shuffle((transpose(X,4) +transpose(X,12) ) ) ,-7) ) ,12) ,7) ) +(echo((transpose((echo((X+X) ,4,6) +step(X,12) ) ,4) +transpose(((X+(shuffle(X) +(arpeggio(X) |shuffle(X) ) ) ) +transpose((X|arpeggio(X) ) ,-7) ) ,-5) ) ,4,6) +transpose(transpose((transpose(((transpose(shuffle(X) ,-7) +transpose((X|X) ,12) ) +((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +X) ) ,4) +transpose((transpose((((X+transpose(echo(X,4,6) ,7) ) +((X+(X+X) ) +transpose(((X+transpose(X,12) ) +transpose((X+X) ,12) ) ,7) ) ) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,-5) |step(shuffle(transpose((X+transpose(X,7) ) ,4) ) ,12) ) ,12) ) ,-5) ,7) ) ) ,12) +transpose((arpeggio(((((((transpose(X,4) +transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose((X|((X+transpose(X,7) ) +transpose(X,7) ) ) ,4) ,12) ) |transpose(X,4) ) +transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,4) ) ,4) ) +transpose(((transpose(((X|echo(X,4,6) ) +transpose(shuffle(X) ,12) ) ,-5) +transpose(transpose(transpose((arpeggio(X) |X) ,-7) ,4) ,4) ) +transpose(((arpeggio(transpose((X+X) ,-7) ) |transpose(X,-5) ) |(((X|((X+X) +(X+transpose(X,7) ) ) ) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose(step((X+X) ,12) ,7) ) ) ,7) ) ,7) ) ) +arpeggio(transpose(transpose(X,-5) ,4) ) ) ,-5) ) ,7) ) ,7) ) ,-7) ,4)
random seed used was 228153247

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