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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Phrase for X:
# of Tracks:
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After 20 generations the expression "X" became this:
(step(transpose(transpose(transpose(shuffle(transpose(transpose(transpose(((X+X) |X) ,-5) ,4) ,-5) ) ,-5) ,-5) ,-7) ,12) +arpeggio((shuffle(((transpose(step(((shuffle(echo(X,4,6) ) +transpose((step(transpose((X|(echo(X,4,6) +transpose(arpeggio(X) ,7) ) ) ,4) ,12) +transpose(transpose((transpose(arpeggio(X) ,-5) |(X+X) ) ,4) ,7) ) ,12) ) |(echo((transpose((X|step(X,12) ) ,4) +((X+X) +transpose((X+X) ,12) ) ) ,4,6) +transpose(transpose(((transpose(X,-5) |transpose(X,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) ,4) ,12) ) ) ,12) ,-7) |transpose((transpose(((step(transpose(X,4) ,12) +transpose(((transpose((transpose(X,4) +transpose(X,7) ) ,4) +transpose(shuffle(transpose((X+transpose(X,12) ) ,4) ) ,4) ) +transpose(transpose((echo((X|X) ,4,6) |((X+X) |transpose(X,4) ) ) ,-5) ,7) ) ,4) ) +transpose(((transpose(arpeggio(transpose(echo(X,4,6) ,-5) ) ,-5) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(((step(X,12) +transpose(transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,-7) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,7) ) ,7) ) ,4) |shuffle(((echo(arpeggio((X+X) ) ,4,6) +transpose(step((((X|X) +arpeggio(echo(X,4,6) ) ) +(transpose(X,4) |(shuffle(X) +transpose(X,12) ) ) ) ,12) ,12) ) +transpose(((transpose(((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(X,7) ) ,-5) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) ,4) ) +transpose((((X|(transpose(X,-5) +transpose(X,12) ) ) +transpose((shuffle(X) +transpose((X|arpeggio(X) ) ,12) ) ,4) ) +transpose(((transpose(transpose(X,-7) ,-5) |(X+transpose(X,7) ) ) +(transpose(X,-5) +(transpose(X,-5) +transpose(shuffle(X) ,7) ) ) ) ,7) ) ,7) ) ,7) ) ) ) ,4) ) |step(((transpose(step(((transpose(transpose(X,-5) ,-5) +(X+transpose(X,4) ) ) +transpose(((((X+transpose(X,4) ) +transpose(((X+X) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ,7) ) ,12) ,-5) +(((echo(echo((X|X) ,4,6) ,4,6) |step(transpose((transpose(X,-5) |X) ,4) ,12) ) +transpose(echo((((transpose((transpose(X,4) +transpose(transpose(X,-7) ,12) ) ,-7) +X) +transpose((transpose(transpose(X,4) ,4) +transpose((arpeggio(X) +(X+transpose(X,7) ) ) ,-5) ) ,7) ) |transpose((step((step(X,12) +transpose(transpose(X,-5) ,4) ) ,12) +transpose((((X+X) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,-7) ) ,4,6) ,4) ) +transpose(step((transpose((X+shuffle(X) ) ,4) +transpose(shuffle((X+transpose(X,7) ) ) ,12) ) ,12) ,7) ) ) +arpeggio(arpeggio(((((X+transpose(X,12) ) +transpose(X,12) ) +(X+transpose(X,7) ) ) +(X+transpose(X,12) ) ) ) ) ) ,12) ) ) +transpose(step(((shuffle(transpose(transpose(transpose((transpose((X+transpose(X,7) ) ,4) +step(transpose(transpose(X,4) ,4) ,12) ) ,-5) ,-5) ,4) ) |arpeggio(echo(transpose((echo(transpose(transpose(step(transpose(((X+transpose(X,7) ) +echo(X,4,6) ) ,-5) ,12) ,-5) ,4) ,4,6) |transpose(transpose(X,4) ,-5) ) ,-7) ,4,6) ) ) +transpose((((transpose(((transpose(((((X|(X+transpose(X,7) ) ) +transpose(step(X,12) ,12) ) +transpose(transpose(transpose(X,4) ,-7) ,12) ) +transpose(echo(step(X,12) ,4,6) ,12) ) ,-5) +((transpose((step((X+transpose(X,7) ) ,12) +transpose(X,-7) ) ,4) |(transpose(X,-5) +transpose((transpose(X,-7) +X) ,12) ) ) +transpose((echo((step((X|X) ,12) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,4,6) +transpose((transpose((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,-5) +transpose(transpose(((X+transpose((echo(X,4,6) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(X,7) ) ,4) ,12) ) ,7) ) ,7) ) ) +transpose(shuffle(transpose(transpose((X+transpose(X,7) ) ,4) ,-5) ) ,12) ) ,-5) +transpose(arpeggio(step(((echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) +transpose(transpose(X,-7) ,12) ) +transpose((transpose(transpose((X+X) ,4) ,-7) +transpose(transpose((X+transpose(X,4) ) ,-5) ,12) ) ,7) ) ,12) ) ,4) ) +transpose(echo((((transpose((((X+(X+X) ) +(echo(X,4,6) +transpose(arpeggio(X) ,12) ) ) +transpose(((step(X,12) +shuffle(X) ) +echo((X+transpose(X,12) ) ,4,6) ) ,12) ) ,-7) +(((transpose(echo(X,4,6) ,-7) +transpose((((((X+X) +transpose(X,12) ) +transpose((X+transpose(transpose(X,-7) ,7) ) ,4) ) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,7) ) +(transpose(X,4) +((X|X) +transpose((X+transpose(X,12) ) ,7) ) ) ) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) +transpose(transpose(((X+transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ,12) ) ) |echo(transpose(arpeggio(transpose(((X|X) +echo(X,4,6) ) ,4) ) ,-7) ,4,6) ) +transpose(echo(transpose(((step(transpose(X,-5) ,12) |transpose(step(X,12) ,4) ) |((transpose((X|X) ,4) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) ,-7) ,4,6) ,7) ) ,4,6) ,7) ) +transpose((transpose((transpose(step((((X+X) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,4) +transpose(echo(transpose(transpose(step(transpose((X|X) ,-7) ,12) ,-7) ,4) ,4,6) ,12) ) ,4) |(transpose(shuffle((X|X) ) ,4) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ) ,-5) ) ,7) ) ,12) ,7) ) ) )
random seed used was 164175387 EXPR = transpose((transpose((arpeggio(shuffle(step(transpose(step((echo(X,4,6) +(X+X) ) ,12) ,-7) ,12) ) ) +transpose((transpose((transpose(transpose(transpose((transpose((((X|arpeggio(X) ) +(X+X) ) +((X+transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,4) +((((transpose(X,4) +(X+X) ) +transpose(arpeggio(step(X,12) ) ,12) ) +transpose(((transpose(X,-5) |step(X,12) ) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,4) ,-5) ,-7) |transpose(echo(step(shuffle((transpose(X,-7) +transpose(X,7) ) ) ,12) ,4,6) ,4) ) ,-5) +transpose(echo(((transpose(transpose((((((((X+(X+X) ) |transpose(X,-7) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((step(X,12) +transpose((arpeggio(X) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) ,12) ) ,7) ) |((step(X,12) +echo(X,4,6) ) +arpeggio(shuffle(((X|X) |X) ) ) ) ) +((step((arpeggio(X) |X) ,12) +transpose((step(step((((X+transpose(X,12) ) |(X+X) ) +(transpose(transpose(X,-5) ,-5) +transpose(((X+X) +X) ,12) ) ) ,12) ,12) +transpose((transpose((shuffle(X) +transpose(transpose(X,-5) ,7) ) ,4) +transpose(transpose(step((shuffle(X) +transpose(X,7) ) ,12) ,4) ,7) ) ,7) ) ,4) ) +transpose(transpose(step((transpose(echo(transpose(X,4) ,4,6) ,-7) +step(transpose(shuffle(arpeggio(X) ) ,4) ,12) ) ,12) ,-7) ,7) ) ) ,-7) ,-5) +transpose(arpeggio(arpeggio(step(shuffle(((transpose(transpose(X,-5) ,-5) |transpose(transpose((X+X) ,-5) ,-5) ) +transpose(echo((arpeggio(X) +arpeggio(shuffle(arpeggio(X) ) ) ) ,4,6) ,12) ) ) ,12) ) ) ,4) ) +transpose(shuffle(transpose(transpose((step(transpose((transpose(X,4) |arpeggio(X) ) ,4) ,12) +transpose((transpose((((step(transpose(X,-5) ,12) |(transpose(X,-5) +transpose(arpeggio(X) ,12) ) ) |transpose((shuffle(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +arpeggio((((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) +(X+(X+transpose(X,12) ) ) ) ) ) ,4) +(transpose(((echo(X,4,6) |(X+transpose(X,12) ) ) +transpose(transpose(X,-7) ,12) ) ,-7) +((transpose(transpose(transpose(X,-5) ,-5) ,-7) +transpose(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(echo(step(X,12) ,4,6) ,7) ) +transpose(transpose(((X+X) +transpose(echo(X,4,6) ,12) ) ,4) ,7) ) ,12) ) +(((X|X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) ) ) ,7) ) ,-5) ,4) ) ,7) ) ,4,6) ,7) ) ,12) ) ,-5) +arpeggio((arpeggio(((shuffle(((transpose(transpose(((X|X) |transpose(shuffle(X) ,-7) ) ,-5) ,-7) +transpose(transpose(arpeggio(X) ,4) ,7) ) +transpose(transpose(((transpose(arpeggio((((X|X) +transpose(X,12) ) +transpose(transpose(transpose(X,4) ,-7) ,12) ) ) ,-5) +transpose(echo(shuffle((((transpose(echo(X,4,6) ,-5) |((X|X) +transpose(X,7) ) ) +transpose(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ,4) ) +transpose((((arpeggio(X) +transpose(X,4) ) +transpose((X|(X+transpose(X,7) ) ) ,4) ) +transpose((X+X) ,7) ) ,7) ) ) ,4,6) ,7) ) +transpose((((arpeggio(transpose(X,-5) ) +transpose((transpose(X,-7) |X) ,7) ) +transpose((echo(transpose(X,-5) ,4,6) |shuffle((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +(X|X) ) ) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,-7) ) ,4) ,12) ) ) +transpose(((((((transpose(((step(X,12) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ,-7) |(step((transpose(X,4) +transpose((X+X) ,-7) ) ,12) +transpose(arpeggio(transpose((transpose(X,-5) +transpose(X,-7) ) ,4) ) ,7) ) ) +transpose(step((((transpose(echo((X+X) ,4,6) ,-5) +transpose(((((X|X) +transpose(transpose(X,4) ,7) ) +transpose((transpose(X,4) |arpeggio(X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) +transpose((X|X) ,-7) ) ,12) ,12) ) +echo(transpose(transpose(transpose(X,4) ,-7) ,-5) ,4,6) ) +transpose(transpose(transpose(step((transpose((arpeggio(transpose(X,-7) ) +transpose((echo(step(X,12) ,4,6) +transpose(X,12) ) ,7) ) ,-5) |((transpose((transpose(X,-7) +transpose(X,7) ) ,4) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(transpose((transpose((step(X,12) |X) ,-5) |(transpose(X,4) +(arpeggio(X) +transpose(transpose(X,-5) ,12) ) ) ) ,-5) ,7) ) ) ,12) ,-5) ,4) ,4) ) +transpose(echo((transpose(echo((((X+transpose(X,7) ) +transpose((X|X) ,7) ) +transpose(transpose((X+transpose((X+X) ,12) ) ,-5) ,-5) ) ,4,6) ,-7) +transpose((((transpose(transpose((X+X) ,-5) ,4) |transpose(X,-5) ) +transpose(transpose((((transpose((X+X) ,4) |step(X,12) ) |transpose((X|X) ,-5) ) +transpose(echo(X,4,6) ,4) ) ,4) ,4) ) +transpose(transpose(((X+transpose(X,7) ) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-7) ,12) ) ,4) ,7) ) ,-7) ) ,4,6) ,7) ) +(((arpeggio(echo(((echo(X,4,6) |transpose((X+X) ,-5) ) +transpose(((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) +((X+transpose(X,7) ) +transpose((X+X) ,12) ) ) ,7) ) ,4,6) ) +arpeggio(((transpose((((((X|X) +transpose(transpose(X,-7) ,7) ) +arpeggio((X+transpose(X,12) ) ) ) +transpose((X|X) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,-5) +(((transpose(X,4) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |(((X|X) |X) +transpose(step((X+X) ,12) ,4) ) ) ) |step(((X+X) +(X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) ) ) +transpose(transpose(transpose(shuffle((transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,-7) +transpose(shuffle(step((X|X) ,12) ) ,12) ) ) ,-5) ,4) ,4) ) +transpose(transpose(((transpose(transpose(X,-5) ,4) |((transpose(X,-7) +transpose((X|X) ,7) ) +(transpose(X,-7) +echo(X,4,6) ) ) ) |transpose(((X+X) |transpose(X,-5) ) ,-5) ) ,-7) ,7) ) ) ,4) ) +transpose(shuffle(arpeggio((echo(step(transpose(((X|X) +transpose(((transpose(X,4) +transpose(echo(X,4,6) ,12) ) +echo(X,4,6) ) ,12) ) ,-5) ,12) ,4,6) +transpose(step(transpose(transpose(((((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose((X+X) ,4) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ,-7) ,4) ,12) ,-5) ) ) ) ,7) ) ) +transpose((transpose((shuffle(((transpose((arpeggio(transpose(((shuffle(X) +transpose(transpose(shuffle(transpose(X,-5) ) ,-7) ,4) ) +transpose(echo((step(X,12) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,7) ) ,-7) ) +transpose(transpose(transpose((X+X) ,4) ,-5) ,7) ) ,-5) +transpose(((echo((X+transpose(arpeggio(X) ,7) ) ,4,6) |arpeggio((step((X+(X|X) ) ,12) +transpose((arpeggio(X) |(step(X,12) +shuffle(X) ) ) ,7) ) ) ) +transpose(transpose((((X+X) +arpeggio(X) ) |(((echo(transpose(X,4) ,4,6) +transpose(((X|X) |X) ,12) ) +transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) ) ,-7) ,12) ) ,12) ) |arpeggio(((transpose(transpose(transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |transpose(X,-7) ) ,4) ,-7) ,-7) +transpose(transpose(transpose(shuffle(transpose(((((X|X) +transpose(transpose(X,-7) ,7) ) +transpose(X,4) ) +transpose((transpose(X,4) +transpose(X,-5) ) ,7) ) ,-5) ) ,-5) ,4) ,12) ) |(transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) ,4) |(transpose((X+transpose(X,7) ) ,4) +transpose(step((transpose(transpose(step(X,12) ,-5) ,4) +(X|X) ) ,12) ,-7) ) ) ) ) ) ) |step((((transpose(shuffle((shuffle(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose((arpeggio(X) +transpose(echo((X+X) ,4,6) ,12) ) ,7) ) ) ,-7) |(echo(echo(((shuffle((X+transpose(X,12) ) ) +(X+transpose(X,7) ) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ,4,6) +transpose(transpose((shuffle(X) |transpose(X,-7) ) ,-7) ,-5) ) ) +transpose((((transpose(X,-5) +transpose(shuffle(transpose(X,4) ) ,12) ) +((transpose(X,4) +echo((X|X) ,4,6) ) |(transpose(X,4) |X) ) ) +transpose((echo(transpose(transpose(transpose(X,4) ,-7) ,4) ,4,6) +transpose(echo((X+transpose(echo(X,4,6) ,7) ) ,4,6) ,7) ) ,7) ) ,4) ) +transpose((shuffle(shuffle(transpose(shuffle(arpeggio(X) ) ,-5) ) ) +transpose(((step((X+transpose(X,12) ) ,12) +transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,12) ) ,4) +transpose(transpose(arpeggio(step(((echo(((transpose(X,-5) +transpose(X,4) ) |(transpose(X,4) +transpose((transpose(X,-5) |X) ,7) ) ) ,4,6) |(step(transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,-7) +((X|X) +transpose(X,12) ) ) ,4) ,12) +transpose(((echo((X|X) ,4,6) |echo((X+transpose((X+X) ,12) ) ,4,6) ) |(shuffle(shuffle(X) ) +transpose(step(X,12) ,12) ) ) ,12) ) ) +transpose((transpose(((transpose(step(X,12) ,4) +(transpose(step(X,12) ,-7) |transpose(X,-7) ) ) +transpose(transpose(((transpose((X+transpose(X,7) ) ,4) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ,12) ) ,-7) +transpose(transpose((step(transpose(X,-5) ,12) +transpose(transpose(((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +(shuffle(X) +transpose(X,7) ) ) ,-7) ,12) ) ,-5) ,12) ) ,7) ) ,12) ) ,-5) ,12) ) ,7) ) ) ) ,4)
random seed used was 0

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