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:
Seed:
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Generations:
Phrase for X:
# of Tracks:
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After 19 generations the expression "X" became this:
((transpose(((arpeggio(shuffle(shuffle((((transpose(step((arpeggio(step(X,12) ) +transpose(echo(arpeggio(X) ,4,6) ,12) ) ,12) ,-7) +transpose(((transpose(X,-5) +transpose(echo(step((X+transpose(X,12) ) ,12) ,4,6) ,4) ) +transpose((echo(X,4,6) +transpose(arpeggio(arpeggio(echo(X,4,6) ) ) ,7) ) ,7) ) ,4) ) +transpose(step(shuffle(echo(((shuffle(X) +transpose(X,4) ) +transpose(step((X|X) ,12) ,7) ) ,4,6) ) ,12) ,7) ) +transpose((transpose(echo(((transpose((echo((X|X) ,4,6) +echo((X+X) ,4,6) ) ,-7) +transpose(arpeggio(X) ,4) ) +transpose((shuffle(transpose(arpeggio(X) ,-5) ) +(echo(X,4,6) |(step(X,12) |(X+X) ) ) ) ,7) ) ,4,6) ,-7) |(transpose(step((arpeggio(X) |(arpeggio(X) +X) ) ,12) ,-7) +transpose(arpeggio(((X+transpose(transpose(X,4) ,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) ) ,12) ) ) ,12) ) ) ) ) +transpose((((((((transpose(transpose(X,-5) ,-5) +transpose(step((X+X) ,12) ,4) ) +transpose((X|echo(X,4,6) ) ,7) ) +transpose(step(shuffle(X) ,12) ,4) ) +transpose((((((shuffle((((shuffle(X) |transpose((X|X) ,-7) ) +transpose(step(shuffle(X) ,12) ,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) ) +transpose((arpeggio(arpeggio(arpeggio(X) ) ) |((X+transpose(transpose(X,-5) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,12) ) |(transpose(echo(shuffle(X) ,4,6) ,-5) +transpose((shuffle(step(X,12) ) +(X|X) ) ,7) ) ) +transpose(arpeggio((arpeggio(transpose((X+transpose(X,4) ) ,-7) ) +transpose(transpose(step((X|(X|X) ) ,12) ,4) ,12) ) ) ,4) ) +transpose(step(transpose(transpose(shuffle(transpose(transpose(transpose(X,-7) ,-7) ,4) ) ,-7) ,4) ,12) ,7) ) +transpose(((arpeggio((X+X) ) |transpose((X+(X|X) ) ,4) ) +transpose(step(transpose(echo(arpeggio(X) ,4,6) ,-5) ,12) ,12) ) ,-7) ) ,4) ) +transpose((step(transpose(shuffle(shuffle(echo(X,4,6) ) ) ,-7) ,12) +transpose(step(transpose((((echo(transpose(((step(X,12) +transpose(transpose(X,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ,4,6) +transpose(shuffle(shuffle(shuffle(X) ) ) ,12) ) +arpeggio(echo(transpose(transpose(X,4) ,-5) ,4,6) ) ) |(((step(echo(X,4,6) ,12) +transpose(((step(X,12) +arpeggio((X+X) ) ) |echo(arpeggio(transpose(shuffle(X) ,4) ) ,4,6) ) ,4) ) +transpose(step(X,12) ,7) ) |(shuffle(shuffle(shuffle(step(X,12) ) ) ) +transpose((echo(step(step(X,12) ,12) ,4,6) |shuffle(transpose((shuffle(X) |X) ,4) ) ) ,12) ) ) ) ,-5) ,12) ,12) ) ,7) ) +transpose(transpose((step(shuffle((arpeggio(((shuffle((step(X,12) |arpeggio(X) ) ) +echo((X|transpose(X,-7) ) ,4,6) ) +shuffle(((X+transpose(X,7) ) |shuffle(arpeggio(transpose(X,-5) ) ) ) ) ) ) +transpose(echo((transpose(shuffle(X) ,4) +transpose(step(X,12) ,4) ) ,4,6) ,12) ) ) ,12) +transpose(((transpose(echo((transpose(step(X,12) ,4) +arpeggio(((arpeggio(X) +(shuffle(X) |X) ) +transpose((shuffle((shuffle(X) +transpose((X|X) ,7) ) ) +(step(X,12) |shuffle((X+transpose(X,12) ) ) ) ) ,12) ) ) ) ,4,6) ,-7) +transpose((echo(arpeggio(((transpose((X+X) ,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose((shuffle(transpose(X,-7) ) +((X|X) +transpose(X,12) ) ) ,7) ) ) ,4,6) |(echo(arpeggio(shuffle(((X+X) +X) ) ) ,4,6) +transpose(transpose(step(arpeggio((shuffle(X) +transpose(transpose(X,-7) ,7) ) ) ,12) ,-7) ,7) ) ) ,12) ) +transpose(step(transpose(step(arpeggio(step(X,12) ) ,12) ,4) ,12) ,7) ) ,12) ) ,-7) ,4) ) +transpose(echo(step((echo(step(arpeggio((step((transpose(X,-5) +arpeggio(X) ) ,12) |echo(echo(X,4,6) ,4,6) ) ) ,12) ,4,6) +(((step(shuffle(((transpose(X,-5) +X) +transpose(X,-5) ) ) ,12) +transpose(shuffle(arpeggio(transpose(echo(X,4,6) ,-5) ) ) ,7) ) +shuffle(((transpose((X+transpose(X,7) ) ,-5) |X) +arpeggio((transpose(X,-5) +X) ) ) ) ) +transpose(transpose(transpose(arpeggio(X) ,-7) ,-5) ,7) ) ) ,12) ,4,6) ,7) ) ,4) ) +transpose(step(transpose((transpose(step((transpose(step((transpose(X,4) +shuffle(X) ) ,12) ,-5) +step((X|X) ,12) ) ,12) ,4) +echo((((transpose(((X+transpose((X|shuffle(X) ) ,7) ) +transpose((arpeggio(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) ,-5) |echo((shuffle(X) +transpose(transpose((X+transpose(arpeggio(X) ,12) ) ,4) ,12) ) ,4,6) ) +transpose(echo((echo(shuffle(X) ,4,6) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,4,6) ,4) ) +transpose(((shuffle(step(shuffle(shuffle(X) ) ,12) ) +transpose(shuffle(echo(((transpose((X+transpose(echo(X,4,6) ,7) ) ,4) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,4,6) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,7) ) ,4,6) ) ,4) ,12) ,7) ) ,-5) +transpose(echo((arpeggio(arpeggio(transpose((transpose(((echo(X,4,6) |echo(transpose(arpeggio(X) ,-5) ,4,6) ) +echo((step(transpose(X,4) ,12) |arpeggio(X) ) ,4,6) ) ,-5) +step(transpose(arpeggio(arpeggio(echo(X,4,6) ) ) ,-7) ,12) ) ,4) ) ) +((step(arpeggio(transpose((((((X+transpose(X,12) ) +shuffle(X) ) +transpose((X+transpose(echo((X+X) ,4,6) ,7) ) ,4) ) +transpose(transpose(step(step(X,12) ,12) ,-7) ,7) ) |echo((step(echo(X,4,6) ,12) |shuffle(shuffle(((X+X) +transpose(transpose(X,-5) ,12) ) ) ) ) ,4,6) ) ,-7) ) ,12) +transpose((((shuffle(echo((shuffle(step(echo(step(echo(X,4,6) ,12) ,4,6) ,12) ) +transpose(arpeggio(arpeggio(echo((((step(X,12) +transpose(X,7) ) +transpose(((step(X,12) +transpose(X,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) ) ,7) ) ,4,6) ) ) ,12) ) ,4,6) ) |transpose(transpose((((echo(echo(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,4,6) ,4,6) +transpose(step(shuffle(X) ,12) ,-5) ) +((X+X) +transpose(transpose(X,4) ,12) ) ) +arpeggio((shuffle(arpeggio((step(X,12) |shuffle(X) ) ) ) +transpose(transpose(shuffle(arpeggio(X) ) ,4) ,12) ) ) ) ,4) ,4) ) +transpose((transpose((((arpeggio(transpose(echo((X+arpeggio(X) ) ,4,6) ,-7) ) +transpose(((arpeggio(echo(arpeggio((X+X) ) ,4,6) ) |shuffle(X) ) +(echo(arpeggio(X) ,4,6) +transpose(shuffle(transpose(shuffle((X+transpose(X,7) ) ) ,-5) ) ,12) ) ) ,12) ) +transpose(arpeggio((arpeggio(echo(step((transpose(X,-5) +transpose(X,12) ) ,12) ,4,6) ) +transpose(((arpeggio(step(shuffle(X) ,12) ) |((shuffle(X) +transpose(X,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ) +transpose(step(shuffle(X) ,12) ,12) ) ,7) ) ) ,12) ) +transpose(arpeggio(X) ,7) ) ,4) |arpeggio(((echo(shuffle(arpeggio(echo((X|(X+transpose(X,7) ) ) ,4,6) ) ) ,4,6) +((transpose(transpose(arpeggio((shuffle(X) |transpose(X,-7) ) ) ,-5) ,4) +transpose(step((step((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ,12) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-7) ) ,12) ,4) ) +transpose(transpose(echo(step(X,12) ,4,6) ,4) ,7) ) ) |shuffle((((arpeggio(echo(X,4,6) ) |((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) +step(arpeggio(transpose(X,-5) ) ,12) ) +transpose(step(step(X,12) ,12) ,-5) ) ) ) ) ) ,4) ) +transpose((echo(((arpeggio(shuffle(transpose((transpose((arpeggio(X) |transpose(X,4) ) ,4) |transpose(transpose(X,-5) ,-5) ) ,-7) ) ) +transpose((arpeggio(shuffle(((((X+X) +transpose(echo(X,4,6) ,12) ) +transpose(X,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ) ) |shuffle(transpose(transpose(X,-7) ,4) ) ) ,12) ) +step(transpose(transpose(arpeggio(((X+X) +(X+transpose(X,7) ) ) ) ,-5) ,-5) ,12) ) ,4,6) +step(transpose(shuffle(((echo(((echo(X,4,6) +transpose(echo(X,4,6) ,12) ) +transpose(transpose(shuffle(X) ,-5) ,12) ) ,4,6) |transpose((echo(X,4,6) +transpose(shuffle((X+transpose(X,7) ) ) ,12) ) ,-7) ) |step((echo(step(echo(X,4,6) ,12) ,4,6) +transpose(transpose(step(step(X,12) ,12) ,4) ,7) ) ,12) ) ) ,-7) ,12) ) ,7) ) ,4) ) +transpose(echo(arpeggio(step((arpeggio((step(step((X|X) ,12) ,12) |echo(transpose(X,4) ,4,6) ) ) |transpose(transpose((transpose(echo(X,4,6) ,-7) |transpose(X,4) ) ,-7) ,4) ) ,12) ) ,4,6) ,7) ) ) ,4,6) ,4) ) +transpose(arpeggio((shuffle(step(echo(transpose(step(((transpose(arpeggio(X) ,-5) +transpose(X,4) ) +transpose(((shuffle(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,7) ) ,12) ,4) ,4,6) ,12) ) +transpose((transpose(transpose(shuffle((X+transpose(X,7) ) ) ,-7) ,4) +transpose(step(arpeggio(shuffle(shuffle(arpeggio(((((step(transpose(X,-7) ,12) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(X,4) ) +transpose((X+transpose((X+(X|X) ) ,7) ) ,7) ) ) ) ) ) ,12) ,12) ) ,12) ) ) ,7) )
random seed used was 237739253

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