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:
((echo(echo(transpose((transpose((transpose(((transpose(echo((echo(transpose(transpose(arpeggio(X) ,-5) ,-7) ,4,6) |(transpose((echo((X+transpose(X,12) ) ,4,6) |step(transpose(transpose(X,-5) ,4) ,12) ) ,4) +transpose(transpose(X,-7) ,-5) ) ) ,4,6) ,4) +transpose(((X+transpose(transpose(X,-5) ,7) ) +step((transpose(transpose((transpose(X,-7) |arpeggio(X) ) ,-7) ,4) +(X+(X|X) ) ) ,12) ) ,4) ) +transpose((echo(((shuffle(shuffle((X+X) ) ) |transpose(X,4) ) +((step(X,12) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4,6) +transpose(((((step(((X+transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) +transpose((transpose(arpeggio(X) ,-5) +echo((X+transpose(X,12) ) ,4,6) ) ,4) ) +transpose(X,7) ) +step((shuffle(X) +(((X+transpose(transpose(X,-5) ,12) ) +transpose(transpose(X,4) ,4) ) +transpose(((X+X) +X) ,7) ) ) ,12) ) +transpose(transpose(transpose((arpeggio(X) +(X|X) ) ,-5) ,-5) ,12) ) ,12) ) ,7) ) ,-5) |((transpose((arpeggio((X+transpose(X,7) ) ) +X) ,-7) |transpose((X+arpeggio(X) ) ,4) ) +transpose(transpose((((transpose(X,-7) +transpose(arpeggio(X) ,12) ) +transpose((X+transpose(X,12) ) ,12) ) |(step((X+transpose((X+transpose(X,12) ) ,7) ) ,12) |shuffle(transpose(X,-5) ) ) ) ,-5) ,12) ) ) ,-5) +transpose(shuffle(transpose(arpeggio((echo(transpose(transpose(((X|X) +transpose((X+X) ,12) ) ,4) ,-5) ,4,6) +transpose(transpose((arpeggio(X) +transpose(shuffle((X+transpose(X,7) ) ) ,-5) ) ,4) ,7) ) ) ,-7) ) ,4) ) ,-5) ,4,6) ,4,6) +transpose(transpose(shuffle(transpose(transpose((echo(shuffle(transpose(((((step(((transpose(X,4) +transpose(X,12) ) +transpose((X+X) ,-7) ) ,12) +transpose(step(transpose(((X+transpose(X,-5) ) |(X|transpose(X,4) ) ) ,4) ,12) ,7) ) +transpose(transpose(transpose(((transpose(arpeggio(X) ,4) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,7) ) ,-5) ,-7) ,4) ) +transpose(arpeggio((((arpeggio((((X+X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) +transpose((step((X|X) ,12) +transpose(((X|X) |(X|X) ) ,7) ) ,4) ) +transpose((((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +(X|X) ) ,7) ) ) ,7) ) |(transpose(((transpose((((X+transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(X,7) ) ,-7) +((step(X,12) +transpose(X,4) ) +transpose((X|X) ,7) ) ) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ,4) |arpeggio(transpose(transpose(((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(X,4) ) ,-5) ,-7) ) ) ) ,-5) ) ,4,6) +transpose((transpose((((((echo(X,4,6) +(transpose(X,4) +transpose(((X|X) +transpose(X,12) ) ,12) ) ) +transpose(transpose(shuffle(transpose(transpose(X,-7) ,-5) ) ,-5) ,4) ) +transpose((transpose(X,4) +transpose((transpose((X|X) ,-5) +arpeggio((X+transpose(X,12) ) ) ) ,12) ) ,7) ) +transpose(((transpose((X+transpose(transpose(X,-5) ,7) ) ,-7) |echo(X,4,6) ) +arpeggio(shuffle(step((X+transpose(X,7) ) ,12) ) ) ) ,12) ) +transpose(((transpose(step(X,12) ,-7) +((X+(X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ) |((transpose(X,4) +transpose(step(X,12) ,12) ) |transpose(shuffle(X) ,-7) ) ) ,7) ) ,4) +transpose(transpose((((shuffle(echo(shuffle((((X|X) |transpose(X,-7) ) +shuffle(X) ) ) ,4,6) ) |((((transpose(X,4) +transpose(X,12) ) |(arpeggio((X+transpose(X,12) ) ) |(transpose(X,-7) +echo(X,4,6) ) ) ) +transpose((((X+X) +transpose(transpose(X,-5) ,7) ) +transpose((X+X) ,7) ) ,4) ) +transpose(echo((((X+transpose(X,-5) ) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) ,4,6) ,7) ) ) +transpose(((shuffle(arpeggio(X) ) |step(transpose(X,-7) ,12) ) +shuffle((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((X+transpose(X,7) ) ,-7) ) +((X+X) +transpose(X,-7) ) ) +transpose((X|X) ,7) ) ) ) ,4) ) +transpose((step(transpose((transpose(transpose((X|X) ,-5) ,-5) +step(X,12) ) ,4) ,12) +step((((((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +X) +(transpose((X|X) ,-7) +(X|X) ) ) +transpose(((X+transpose(X,12) ) +(transpose(X,-7) +(X+transpose(X,12) ) ) ) ,12) ) +transpose((arpeggio(X) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ,12) ) ,12) ) ,7) ) ,4) ,12) ) ,7) ) ,-7) ,-7) ) ,-7) ,4) ) +transpose(shuffle(transpose((((((transpose(((X|(X+X) ) +transpose(transpose(X,4) ,12) ) ,4) +arpeggio(((transpose(echo(transpose(echo(X,4,6) ,4) ,4,6) ,-5) +transpose(transpose(arpeggio(transpose((X|X) ,-7) ) ,4) ,12) ) +transpose(echo(shuffle(X) ,4,6) ,-5) ) ) ) +transpose((step(((echo(X,4,6) +transpose((X+transpose((X+X) ,12) ) ,7) ) |shuffle(echo(X,4,6) ) ) ,12) +transpose(transpose((transpose(step(((X+transpose(X,12) ) +transpose((X|X) ,12) ) ,12) ,-7) |arpeggio((transpose(X,4) |(X+step(X,12) ) ) ) ) ,-5) ,12) ) ,12) ) +transpose((((((((step((X+transpose(X,7) ) ,12) +transpose(transpose(transpose(X,4) ,4) ,12) ) +(transpose((X+transpose((X|X) ,12) ) ,-7) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) ) +transpose(((transpose(X,4) +(X+transpose((transpose(X,-5) +transpose(X,12) ) ,12) ) ) |transpose(X,-7) ) ,4) ) +transpose((transpose(((X|X) |transpose(X,4) ) ,4) +transpose(transpose(step(arpeggio(((X+transpose(X,7) ) +(X|X) ) ) ,12) ,4) ,7) ) ,7) ) +transpose(transpose(((((transpose(X,-7) +transpose(X,12) ) +(transpose(X,-5) +transpose((X|X) ,12) ) ) +step(X,12) ) +transpose(transpose(X,-7) ,-5) ) ,4) ,4) ) +transpose(transpose(((transpose(X,4) |transpose((step(X,12) +X) ,4) ) +arpeggio(echo(echo(echo(transpose(X,4) ,4,6) ,4,6) ,4,6) ) ) ,4) ,7) ) |echo(step((transpose(transpose(X,-5) ,-7) +transpose(((((X+step(X,12) ) +transpose((X+X) ,7) ) +(X+(X+transpose(X,12) ) ) ) +((arpeggio(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) ,12) ,4,6) ) ,7) ) +transpose(echo(transpose((((transpose(((transpose((X|X) ,-7) +transpose(transpose((step(X,12) +X) ,4) ,7) ) +transpose((((echo(X,4,6) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) |echo((X|X) ,4,6) ) ,7) ) ,-7) +transpose(arpeggio(((((((X+X) +(X+step(X,12) ) ) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(echo(((X+X) |X) ,4,6) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(transpose((X|X) ,-7) ) ,7) ) ) ,4) ) +transpose(((((X+transpose(echo(arpeggio(X) ,4,6) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) +transpose(transpose(transpose(transpose(transpose(step(X,12) ,-5) ,4) ,-5) ,-7) ,4) ) +transpose(echo(step(((X+transpose(step(X,12) ,12) ) +shuffle((X+arpeggio(X) ) ) ) ,12) ,4,6) ,7) ) ,7) ) +((transpose((shuffle(transpose(X,4) ) +echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) ) ,4) +transpose(((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) +transpose(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,4) ) +transpose(transpose(((((transpose(X,-7) +transpose((arpeggio((X+transpose(X,7) ) ) +transpose((X+(X|X) ) ,12) ) ,12) ) |(X|(((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,7) ) ) ) ) |((transpose(X,4) +transpose((echo(X,4,6) +(X+X) ) ,4) ) +transpose(transpose(step(transpose(X,4) ,12) ,-5) ,7) ) ) +transpose(transpose(transpose(arpeggio((X+X) ) ,4) ,-7) ,12) ) ,4) ,7) ) ) ,4) ,4,6) ,12) ) +shuffle(((transpose((((((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,7) ) |transpose(transpose((transpose(X,4) +transpose((X|X) ,12) ) ,-5) ,-5) ) |arpeggio((transpose(X,4) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) ) ) ,4) +step(transpose((((step(echo(X,4,6) ,12) +transpose(X,-7) ) +transpose((step(X,12) +(transpose(X,-7) |transpose(X,-7) ) ) ,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) ,-5) ,12) ) +transpose((transpose(((((transpose(X,4) +transpose((transpose(X,4) |shuffle(X) ) ,12) ) +transpose(transpose(echo(transpose((X+X) ,-7) ,4,6) ,-5) ,4) ) +transpose(step(((shuffle(transpose(X,-7) ) +(arpeggio(X) +transpose((X+X) ,12) ) ) |((X|X) +((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ) ) ,12) ,7) ) |((((transpose((X+transpose(X,12) ) ,-7) +transpose(step(step(X,12) ,12) ,4) ) +transpose(transpose(X,4) ,7) ) |(((X+transpose(X,12) ) +((X+transpose(X,12) ) +(X|X) ) ) +transpose(arpeggio(X) ,7) ) ) +transpose(transpose(((X+transpose(transpose(X,-7) ,12) ) +(X+transpose((X|X) ,12) ) ) ,4) ,-5) ) ) ,-7) +(((transpose(transpose(X,-7) ,-5) +arpeggio(transpose(X,4) ) ) +transpose(arpeggio(shuffle(X) ) ,12) ) |transpose(echo(((transpose(transpose(X,-5) ,4) |(X+(X+X) ) ) +X) ,4,6) ,4) ) ) ,-7) ) ) ) ,4) ) ,7) )
random seed used was 203193348

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