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 20 generations the expression "X" became this:
((transpose(shuffle((echo(((transpose((((((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) +transpose(X,4) ) |echo((X+X) ,4,6) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) +transpose(transpose(transpose((((((shuffle(X) +transpose(shuffle(X) ,12) ) +transpose(((X|(X|X) ) |step(X,12) ) ,12) ) |(transpose(X,-5) |((transpose(X,-5) |(X+X) ) +transpose(X,-5) ) ) ) +transpose(echo(transpose((X+transpose(transpose(X,-7) ,12) ) ,-5) ,4,6) ,4) ) +transpose((((((X|X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) |(X+transpose((X|X) ,7) ) ) +transpose(((arpeggio(X) +transpose(shuffle((X+(X+transpose(X,7) ) ) ) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,12) ) ,7) ) ,-5) ,4) ,4) ) +transpose(step(((arpeggio(transpose(shuffle(step(X,12) ) ,-7) ) +transpose((X|echo(transpose(shuffle(X) ,4) ,4,6) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,12) ,7) ) ,4,6) |(((step(step((step((step((transpose(X,-7) +transpose(X,12) ) ,12) +transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ) ,12) +transpose((step((step(X,12) |transpose(X,-7) ) ,12) +transpose(((X+X) |(X+transpose(transpose(X,-5) ,12) ) ) ,12) ) ,12) ) ,12) ,12) |(echo(((transpose(((((((X+X) +transpose(X,4) ) +transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(((shuffle(transpose(X,4) ) +transpose(X,4) ) +transpose((transpose(X,-5) |X) ,7) ) ,4) ) +transpose(transpose((transpose(X,4) +X) ,-5) ,7) ) ,-5) +transpose(((((((X+X) +transpose(echo(X,4,6) ,7) ) +transpose(X,4) ) +transpose(((X|X) |(X+X) ) ,7) ) +transpose(transpose((step((X+transpose(X,7) ) ,12) +transpose((X|transpose(X,-7) ) ,7) ) ,-7) ,7) ) +transpose(transpose(step(X,12) ,4) ,12) ) ,4) ) +transpose(((transpose(X,-5) +((X+X) +X) ) +((((((X+transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) +transpose((X+X) ,12) ) |((X+(X+X) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ) +transpose(((transpose((X+transpose(X,12) ) ,-5) +transpose(((echo(X,4,6) +transpose((X|X) ,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) ,4) ) +transpose((step(transpose(X,-7) ,12) +(transpose(X,-7) |(X+transpose((X|X) ,12) ) ) ) ,7) ) ) ,7) ) ,4,6) +transpose((transpose(transpose((transpose(X,-5) +((shuffle((transpose(X,-5) |shuffle(X) ) ) +transpose(transpose(step((X+X) ,12) ,4) ,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ) ,-5) ,-5) |arpeggio(step(((transpose(transpose(X,4) ,-5) +transpose((X|X) ,7) ) +transpose(X,4) ) ,12) ) ) ,7) ) ) +transpose(transpose((step(((arpeggio(transpose(X,-5) ) |transpose(echo((X+X) ,4,6) ,4) ) +transpose(((transpose(((X+X) +transpose((transpose(X,4) |echo(X,4,6) ) ,12) ) ,-7) |(echo((X+X) ,4,6) +transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,4) ,12) ) ) +transpose(transpose((X+transpose(shuffle(X) ,12) ) ,-5) ,7) ) ,12) ) ,12) +transpose(((((((transpose((X+transpose(X,12) ) ,4) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,7) ) +((step(((echo(X,4,6) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(((transpose((X|X) ,-7) +transpose((transpose((echo(X,4,6) |transpose((X+X) ,-7) ) ,4) |arpeggio(transpose(echo(X,4,6) ,-5) ) ) ,4) ) +transpose(arpeggio((shuffle(step(X,12) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ) ,7) ) ,4) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) ,7) ) |transpose(step((((transpose(transpose((X+X) ,4) ,-5) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose(((step((X+(X+X) ) ,12) +transpose(echo((X+X) ,4,6) ,4) ) +transpose((X+(X+X) ) ,7) ) ,7) ) +transpose((((X|transpose(X,-5) ) |X) |transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) ,4) ) ,7) ) ,12) ,-7) ) ,7) ) ,-7) ,4) ) +transpose((transpose((((echo(transpose(transpose(transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,-5) ,-5) ,4,6) +transpose(transpose((echo(((X+transpose(((X+X) +transpose(X,7) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ,4,6) +(((arpeggio(X) +transpose(((shuffle(step(X,12) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose((X|X) ,4) ) +transpose(((((X|X) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) |(step(X,12) |transpose(X,4) ) ) ,7) ) ) ,4) ,4) ) +transpose(step(((transpose(transpose(X,4) ,4) |((X+X) +(X+X) ) ) +(transpose((X+transpose(X,7) ) ,4) +transpose((transpose(step(X,12) ,-7) +(transpose(X,-5) +transpose(X,-5) ) ) ,12) ) ) ,12) ,7) ) +transpose(transpose((((X|X) +transpose(X,4) ) +transpose(((X+transpose(X,7) ) |shuffle(X) ) ,7) ) ,-5) ,-7) ) ,-7) |transpose((transpose((step((transpose(X,-5) +transpose(X,7) ) ,12) +transpose(transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ,4) |echo(transpose(arpeggio((X+X) ) ,4) ,4,6) ) ,-5) ) ,7) ) ) ) ,4) +transpose(step((transpose(arpeggio(echo(shuffle(arpeggio(transpose((X|X) ,-5) ) ) ,4,6) ) ,-7) +transpose(((arpeggio(((transpose((transpose(step(shuffle(X) ,12) ,4) +transpose((transpose(X,-7) +(X+X) ) ,7) ) ,4) |transpose(transpose(arpeggio(X) ,-5) ,4) ) +transpose(transpose(echo(transpose(transpose(shuffle(step(X,12) ) ,-7) ,-7) ,4,6) ,4) ,7) ) ) +transpose((transpose(transpose((transpose((X+X) ,-5) +transpose(X,7) ) ,4) ,4) +transpose(shuffle((((arpeggio((X|X) ) |(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +(X|(X+transpose(X,7) ) ) ) ) +((transpose(echo(X,4,6) ,-5) +transpose((transpose(X,4) +transpose(X,7) ) ,4) ) +transpose((transpose(X,-7) +transpose((transpose(X,-5) +transpose((X|X) ,7) ) ,12) ) ,7) ) ) +transpose((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) ,4) ) ) ,-5) ) ,4) ) +transpose(transpose((((transpose(X,-7) +transpose((X+X) ,-7) ) +((arpeggio(arpeggio(X) ) |arpeggio(transpose(X,-7) ) ) +transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ,12) ) ) +transpose(((transpose(shuffle((X|X) ) ,-5) +transpose((transpose((arpeggio(transpose(X,-7) ) +(transpose(X,4) |X) ) ,-5) |transpose((X|arpeggio(X) ) ,-5) ) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,12) ) ,-5) ,7) ) ,-5) ) ,12) ,12) ) |echo((arpeggio(transpose(arpeggio(echo(echo((transpose(transpose(X,-7) ,4) +transpose(shuffle((((((((arpeggio(transpose(X,-7) ) +transpose(X,7) ) +transpose((arpeggio(echo(X,4,6) ) +X) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(((arpeggio(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ,-7) ,4) ) +transpose(((X|X) |X) ,7) ) +transpose(transpose((transpose(X,-5) +transpose((X|X) ,7) ) ,-5) ,7) ) +transpose(step(arpeggio(arpeggio((X|X) ) ) ,12) ,12) ) ) ,12) ) ,4,6) ,4,6) ) ,-7) ) +((transpose(transpose((shuffle(transpose(transpose((X|(X|X) ) ,4) ,-5) ) +transpose(echo(echo((transpose(X,4) +transpose((transpose(X,-5) +transpose(shuffle(X) ,12) ) ,7) ) ,4,6) ,4,6) ,12) ) ,-5) ,-5) +transpose(transpose(transpose((transpose(transpose(echo(transpose(X,4) ,4,6) ,4) ,-7) +transpose((shuffle(((transpose(transpose(X,-7) ,-5) |(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ) +(((X+transpose(X,12) ) |step(X,12) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ) ) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ,7) ) ,4) ,-5) ,4) ) +transpose(transpose(((echo(((echo(arpeggio((((X+transpose(X,12) ) |(X+transpose(X,7) ) ) +step((X|X) ,12) ) ) ,4,6) +transpose(step(transpose(transpose(((transpose(X,4) |(X|X) ) |X) ,-5) ,4) ,12) ,4) ) +transpose(((((transpose(X,-5) +transpose((transpose(X,4) +(arpeggio(X) |transpose(X,-7) ) ) ,4) ) +transpose(step((X+X) ,12) ,7) ) +transpose(transpose((((X+transpose(X,12) ) +step((X|X) ,12) ) +(((X|X) +transpose((X|X) ,12) ) |((X|X) |X) ) ) ,-5) ,4) ) +transpose(((((((transpose(X,4) +transpose(X,12) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) +transpose((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(step(X,12) ,7) ) ,-7) ) +transpose((transpose((X+X) ,-5) |(transpose(X,-5) +(X+transpose(X,7) ) ) ) ,4) ) +transpose((((X|X) +transpose(step(X,12) ,12) ) |(step(X,12) +transpose(X,7) ) ) ,7) ) +transpose(step(step(X,12) ,12) ,7) ) ,7) ) ,7) ) ,4,6) |(step(transpose((transpose(transpose(X,4) ,-5) +transpose(step((step((X+transpose(X,7) ) ,12) +transpose((step(X,12) |((X+transpose(X,7) ) +echo(X,4,6) ) ) ,12) ) ,12) ,7) ) ,4) ,12) |transpose(transpose(transpose(echo(transpose((X+transpose(X,12) ) ,4) ,4,6) ,-5) ,4) ,-5) ) ) |transpose(transpose(shuffle(echo(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose((X|(X+transpose(X,12) ) ) ,7) ) +step(((X|X) +transpose((X+X) ,12) ) ,12) ) |arpeggio(transpose((X+transpose(transpose(X,4) ,7) ) ,-7) ) ) ,4,6) ) ,4) ,4) ) ,-5) ,7) ) ) ,4,6) )
random seed used was 234177799

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