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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Phrase for X:
# of Tracks:
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After 18 generations the expression "X" became this:
((((echo(((transpose((((transpose(echo(X,4,6) ,-7) +transpose(((transpose(transpose((X+X) ,-7) ,-7) +transpose(transpose(step(X,12) ,4) ,7) ) +transpose(shuffle(arpeggio(X) ) ,4) ) ,4) ) +transpose((((transpose(transpose(X,-7) ,-5) +step(X,12) ) +(arpeggio(((transpose(X,-7) +transpose(X,4) ) +transpose((X+X) ,7) ) ) |(transpose(X,-7) +transpose(shuffle(X) ,7) ) ) ) +transpose(transpose(transpose((((X+X) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,-7) ,-5) ,7) ) ,7) ) |(((transpose(shuffle(X) ,-5) +transpose((step((X+transpose(transpose(X,-7) ,12) ) ,12) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose(transpose(((transpose(transpose(X,4) ,-5) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) ,4) ) +transpose(arpeggio(step(shuffle(X) ,12) ) ,7) ) ) ,-5) |((echo((X|(X+transpose(X,12) ) ) ,4,6) +transpose(X,-7) ) +(transpose((((transpose(X,4) |X) +transpose(transpose(X,-5) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,4) +step(transpose(transpose(shuffle(X) ,-7) ,-7) ,12) ) ) ) |((transpose(transpose(shuffle((transpose(step(X,12) ,-7) +step(X,12) ) ) ,-5) ,4) +transpose((arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(transpose(shuffle(transpose(X,4) ) ,-5) ) ,7) ) ,7) ) |transpose(arpeggio((((X|(X+transpose(X,12) ) ) |step((X+X) ,12) ) +arpeggio(((X|X) |(transpose(X,-7) +echo(transpose(X,4) ,4,6) ) ) ) ) ) ,4) ) ) ,4,6) +transpose(((transpose(transpose((((((transpose(X,-5) |echo(X,4,6) ) +transpose(transpose(X,-5) ,4) ) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(((shuffle(step(X,12) ) +arpeggio(arpeggio(X) ) ) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(X,-7) ) ,7) ) ,12) ) |(transpose(step(transpose(X,-5) ,12) ,4) |((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) ) ) ,4) ,-5) +transpose(((((transpose((((transpose(X,-5) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) +transpose((X|X) ,12) ) ,12) ) |transpose(transpose(X,4) ,4) ) +((transpose(transpose(X,-5) ,-5) +transpose(((X|X) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,-5) |transpose((((shuffle(shuffle(X) ) +(X|(X|X) ) ) |arpeggio(X) ) |transpose(step((((X+X) +transpose(X,4) ) +transpose((X|X) ,7) ) ,12) ,4) ) ,-7) ) |arpeggio(transpose(transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,4) ,4) ) ) +(echo((transpose(transpose((shuffle((transpose(X,-7) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ) +transpose(transpose(X,4) ,4) ) ,4) ,-5) +(step(transpose(echo((arpeggio(X) |step(X,12) ) ,4,6) ,4) ,12) |step(transpose(echo(shuffle(transpose(X,4) ) ,4,6) ,-7) ,12) ) ) ,4,6) +(((echo(shuffle(transpose(((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ,4) ) ,4,6) +echo(((transpose(X,-7) +transpose(((X|X) |transpose(X,4) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose((X|X) ,7) ) ,7) ) ,4,6) ) +transpose(X,12) ) +transpose(transpose(((transpose(X,4) +echo(X,4,6) ) |transpose(transpose((transpose(X,-7) +transpose(X,7) ) ,-7) ,-7) ) ,-7) ,7) ) ) ) +transpose((transpose(transpose(echo(((((arpeggio((transpose(X,-7) +transpose(step(echo(X,4,6) ,12) ,12) ) ) +transpose(arpeggio(step(shuffle(X) ,12) ) ,4) ) +transpose((X+transpose(X,-7) ) ,7) ) +transpose(((transpose(X,4) |transpose(X,-7) ) +transpose(transpose((echo(X,4,6) +transpose(transpose(X,-5) ,7) ) ,-7) ,12) ) ,4) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) ,7) ) ,4,6) ,-7) ,-7) +transpose((((transpose(X,4) +X) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) +transpose((echo(transpose(echo(X,4,6) ,4) ,4,6) |(X+transpose(X,12) ) ) ,7) ) ,-7) ) ,12) ) ,4) ) +transpose((transpose((step((((((X|X) +transpose((X|X) ,12) ) +transpose(echo(echo(X,4,6) ,4,6) ,4) ) +transpose((X+(X+transpose(X,7) ) ) ,7) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,12) |transpose(transpose(((arpeggio(X) +transpose(arpeggio((X|X) ) ,7) ) +transpose(step(((X|X) +transpose(X,7) ) ,12) ,7) ) ,-7) ,4) ) ,4) |((transpose(transpose(echo((echo(X,4,6) +transpose((transpose(echo(X,4,6) ,-5) |transpose(X,4) ) ,12) ) ,4,6) ,-5) ,4) +transpose(step(X,12) ,-5) ) |shuffle(((((X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) |((shuffle(echo(X,4,6) ) +transpose(echo((X+(X+transpose(X,12) ) ) ,4,6) ,4) ) +transpose(echo(transpose(step(transpose(X,-7) ,12) ,4) ,4,6) ,7) ) ) +transpose((step(transpose((X+transpose(X,7) ) ,4) ,12) |transpose(X,4) ) ,4) ) +transpose(transpose(transpose(transpose((transpose(X,4) +transpose((transpose(transpose(X,-5) ,-5) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) ,12) ) ,4) ,-5) ,4) ,7) ) ) ) ) ,7) ) ,7) ) +transpose(step(arpeggio((shuffle(transpose(((echo(((X|X) |transpose(transpose(X,-7) ,4) ) ,4,6) |transpose(transpose((transpose(transpose(X,-7) ,4) |(transpose(X,4) +step(X,12) ) ) ,-5) ,4) ) +transpose((((((transpose(X,-5) +transpose((X|X) ,4) ) +transpose(X,7) ) |transpose((X|X) ,-5) ) +transpose(transpose(X,4) ,12) ) +transpose(echo(echo((X+transpose(X,12) ) ,4,6) ,4,6) ,12) ) ,12) ) ,4) ) |echo((transpose((shuffle(arpeggio(transpose(X,-5) ) ) +transpose(transpose(transpose(transpose(X,4) ,-5) ,4) ,12) ) ,-7) +arpeggio(transpose((((transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(((step(((X|X) +transpose((X+transpose(X,7) ) ,7) ) ,12) +transpose((shuffle((X+transpose(X,12) ) ) |((X+transpose(X,7) ) +transpose((((X|X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) ,4) ) +transpose((echo(X,4,6) +transpose(transpose(X,4) ,12) ) ,7) ) ,4) ) +transpose(shuffle(echo((X+transpose(X,4) ) ,4,6) ) ,7) ) +((X+transpose(step(transpose(step(X,12) ,4) ,12) ,12) ) +transpose(((transpose((X+transpose(X,12) ) ,-7) +transpose((X|echo(X,4,6) ) ,12) ) +transpose((X|(X+transpose(X,12) ) ) ,12) ) ,4) ) ) ,4) ) ) ,4,6) ) ) ,12) ,7) ) +transpose(transpose(transpose((((((((X+transpose(X,12) ) +(arpeggio(X) |X) ) +transpose(echo(shuffle(transpose((X+X) ,-5) ) ,4,6) ,12) ) |(transpose(((echo(X,4,6) +transpose(X,-7) ) +transpose(X,4) ) ,4) +transpose(transpose(echo(transpose((transpose(X,-5) +step(X,12) ) ,-5) ,4,6) ,-7) ,7) ) ) +transpose(transpose(((X+transpose(transpose(X,-5) ,7) ) +echo(X,4,6) ) ,-7) ,4) ) |transpose(((transpose(transpose((X+X) ,-5) ,-5) +transpose((step(X,12) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,4) ) +transpose(echo(arpeggio(step(X,12) ) ,4,6) ,7) ) ,-5) ) +transpose((((arpeggio(X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) +(((X+X) +X) +transpose(X,7) ) ) +transpose(transpose(transpose(transpose(X,4) ,-7) ,-7) ,7) ) ,12) ) ,-5) ,-7) ,4) ) +transpose((transpose(transpose((((transpose((X|X) ,-5) +echo(transpose(X,4) ,4,6) ) +(shuffle((echo(X,4,6) |X) ) |(transpose(X,4) |transpose(X,-5) ) ) ) +(step((((transpose((transpose(X,-7) +transpose(transpose(X,4) ,7) ) ,4) |(((X|X) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) +transpose(transpose(X,4) ,7) ) +transpose(((transpose(step(X,12) ,-5) +transpose((X+transpose(X,7) ) ,7) ) +transpose(echo(arpeggio((X+transpose(X,7) ) ) ,4,6) ,7) ) ,7) ) ,12) +transpose((((shuffle(((transpose(step((X+X) ,12) ,-5) +(transpose(X,-7) |transpose(X,4) ) ) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,-7) ) ) +transpose(transpose((shuffle(((X+X) +transpose(X,-5) ) ) +((X+transpose(transpose((X+transpose(step(X,12) ,7) ) ,-5) ,12) ) +(echo(X,4,6) +transpose(X,12) ) ) ) ,-7) ,4) ) +transpose(arpeggio(step(shuffle((transpose(X,4) |X) ) ,12) ) ,7) ) +transpose((transpose((transpose((X+transpose(X,7) ) ,4) |transpose(X,-5) ) ,-5) |(transpose(((X+X) +transpose((X|X) ,7) ) ,-7) +transpose(arpeggio(((X+transpose(transpose(echo(X,4,6) ,-7) ,7) ) +transpose(transpose(transpose((X|X) ,-5) ,-7) ,12) ) ) ,12) ) ) ,7) ) ,7) ) ) ,-7) ,-5) +transpose(transpose(transpose(transpose(((((transpose(((((X|X) +transpose(X,4) ) +transpose((X|X) ,7) ) |shuffle(transpose(X,4) ) ) ,4) +(arpeggio((X+X) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) ) +transpose(((transpose((X+X) ,-5) +transpose(transpose(((X+X) |transpose(X,-7) ) ,-5) ,4) ) +transpose((transpose(X,-7) |(((X|X) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,7) ) ,4) ) +transpose((((((X+X) +transpose(transpose((X+X) ,-7) ,7) ) +transpose(((arpeggio(transpose(X,-5) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose((transpose(X,-5) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,12) ) ,-7) ,7) ) ,7) ) +transpose((transpose((shuffle(X) +(X+transpose(X,12) ) ) ,-7) +transpose(shuffle((step((X|(X+transpose(X,7) ) ) ,12) |transpose((X|X) ,-5) ) ) ,7) ) ,4) ) +transpose((transpose(transpose(step(echo(transpose(X,4) ,4,6) ,12) ,-7) ,-5) +transpose(((transpose(transpose(X,4) ,4) |arpeggio(X) ) |arpeggio(echo(X,4,6) ) ) ,12) ) ,7) ) ,7) ) +(arpeggio((shuffle(X) |step(transpose((transpose(X,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,12) ) ) +transpose(transpose((((((transpose((X+X) ,-7) +transpose(transpose((transpose(X,4) |transpose(X,-7) ) ,4) ,7) ) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(((transpose(X,-5) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose((step(echo(X,4,6) ,12) +transpose(((X+transpose(X,7) ) +transpose(X,-7) ) ,4) ) ,7) ) ,7) ) +transpose((transpose(((X|(X+X) ) +((X+transpose(X,12) ) +X) ) ,-5) +transpose((((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) +transpose(((X+transpose(X,7) ) +transpose(X,-5) ) ,7) ) +transpose(transpose(((X|X) |(X|X) ) ,-7) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,7) ) ,4) ) +transpose((((echo(transpose(X,4) ,4,6) +transpose((((X|X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,7) ) ,4) ,12) ) ) ,-7) ,-5) ,-7) ,7) ) ,7) )
random seed used was 170842979

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