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 15 generations the expression "X" became this:
(echo(transpose(((((((((transpose((step(transpose(X,-7) ,12) +transpose(echo(arpeggio(X) ,4,6) ,12) ) ,-5) +transpose(step(step(arpeggio(X) ,12) ,12) ,4) ) +transpose(transpose((arpeggio(transpose(X,-7) ) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ,7) ) +transpose(((((shuffle((X+transpose(X,7) ) ) |transpose(X,-7) ) +transpose(X,4) ) +transpose(step(step((X+transpose(X,12) ) ,12) ,12) ,7) ) +transpose(((transpose(arpeggio(X) ,4) +transpose(transpose(step(transpose(X,4) ,12) ,-5) ,4) ) +transpose(X,7) ) ,12) ) ,-7) ) |(transpose(((X|(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) +transpose(transpose(((transpose(X,-7) +transpose(X,12) ) +echo((X|X) ,4,6) ) ,-7) ,7) ) ,-7) +transpose(echo((transpose(((echo(X,4,6) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) +((X+transpose(X,7) ) +transpose(X,12) ) ) ,4,6) ,12) ) ) +transpose(arpeggio(arpeggio(shuffle(transpose((transpose(X,-5) +transpose(X,-5) ) ,-7) ) ) ) ,4) ) +transpose((arpeggio((transpose(echo(X,4,6) ,-5) |transpose(echo(transpose(X,-5) ,4,6) ,-7) ) ) +transpose(transpose(transpose(arpeggio(X) ,-5) ,-5) ,12) ) ,7) ) +transpose(transpose(echo(transpose((transpose(((X+X) +transpose(shuffle(X) ,7) ) ,4) +transpose((echo((echo(X,4,6) +shuffle(X) ) ,4,6) |(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ,7) ) ,-5) ,4,6) ,4) ,4) ) +transpose((shuffle(transpose((transpose(echo((X+transpose(X,12) ) ,4,6) ,4) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ,-5) ) +transpose((((((shuffle(((X+X) +transpose(X,7) ) ) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,-5) |step(arpeggio(X) ,12) ) ,4) ) +transpose((transpose(shuffle(arpeggio(X) ) ,-7) |step(X,12) ) ,7) ) +transpose(arpeggio(transpose(echo(transpose(X,-5) ,4,6) ,-7) ) ,7) ) +transpose(arpeggio(transpose(transpose(transpose(X,-7) ,-7) ,-7) ) ,4) ) +transpose(transpose(transpose(transpose((transpose(shuffle(X) ,-5) +transpose(arpeggio(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-7) ) ,12) ) ,-7) ,-5) ,-7) ,7) ) ,12) ) ,7) ) ,-7) ,4,6) |arpeggio(transpose(echo(transpose(echo(echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) ,4,6) ,-7) ,4,6) ,4) ) )
random seed used was 62

NOTE: Generated phrase was too large ( 11520 ) , it has been truncated at 5000 notes. EXPR = ((((arpeggio(transpose(X,-7) ) +transpose(((transpose(transpose(X,-5) ,4) +transpose((transpose(X,-5) +transpose(shuffle((((X+X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,7) ) ,4) ) +transpose((step(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,12) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,7) ) ,7) ) +transpose((step(shuffle((step((transpose(X,-5) +transpose(X,7) ) ,12) +transpose(((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) +transpose(echo((X+X) ,4,6) ,7) ) ,12) ) ) ,12) +transpose(arpeggio((((transpose(X,4) |transpose(X,-7) ) +transpose(shuffle((transpose(shuffle(X) ,-5) +transpose(transpose(X,-7) ,7) ) ) ,12) ) |transpose(X,-5) ) ) ,-7) ) ,12) ) +transpose(echo(step(echo((shuffle(X) |X) ,4,6) ,12) ,4,6) ,7) ) +transpose((step((step((transpose(transpose(echo(((X+transpose(X,7) ) +transpose(X,4) ) ,4,6) ,-5) ,-7) +((((X+X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) +arpeggio(X) ) ) ,12) +transpose(echo(transpose(shuffle((((arpeggio(transpose(transpose(X,4) ,-7) ) +transpose(step((transpose(X,-5) +transpose((arpeggio(X) +transpose(X,7) ) ,12) ) ,12) ,4) ) +transpose((transpose((transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-5) +transpose(transpose(step((X+transpose(X,12) ) ,12) ,-7) ,12) ) ,-7) |(echo(X,4,6) |((X+transpose((X+X) ,7) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,12) ) ) ) ,7) ) +transpose(arpeggio(shuffle((transpose(X,-7) +transpose(shuffle(X) ,7) ) ) ) ,7) ) ) ,-7) ,4,6) ,7) ) ,12) +transpose(echo((step(shuffle(shuffle((X|echo(X,4,6) ) ) ) ,12) +transpose((echo((step(X,12) |X) ,4,6) +transpose(((X+transpose((X+transpose(X,7) ) ,7) ) |transpose(shuffle(X) ,-7) ) ,12) ) ,7) ) ,4,6) ,7) ) ,12) )
random seed used was 0 EXPR = (shuffle(transpose(echo(transpose(transpose(step(transpose(arpeggio(shuffle(X) ) ,-5) ,12) ,-5) ,-7) ,4,6) ,-7) ) +transpose(arpeggio(((transpose(((((((transpose(echo(transpose(X,4) ,4,6) ,4) +transpose(transpose(step(((transpose(X,-5) +(X+transpose(X,12) ) ) |(X+transpose(X,7) ) ) ,12) ,4) ,4) ) +transpose(((transpose(X,-5) +transpose(transpose(step(((transpose(X,-7) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,12) ,-7) ,12) ) +transpose((((X+transpose(X,7) ) +transpose(shuffle(echo(X,4,6) ) ,12) ) |transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,-7) ) ,4) ) ,7) ) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose(((echo(transpose(arpeggio(X) ,-7) ,4,6) |transpose(arpeggio((X+X) ) ,-5) ) +transpose(((transpose((X|X) ,-5) +transpose(((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(step((echo(X,4,6) +transpose((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ,7) ) ,7) ) ,7) ) +transpose(transpose(arpeggio(transpose(((echo(arpeggio(X) ,4,6) +transpose(step(transpose((X+transpose(X,7) ) ,-5) ,12) ,4) ) +transpose(shuffle(arpeggio(transpose(X,-7) ) ) ,7) ) ,-5) ) ,-7) ,4) ) +transpose((echo(arpeggio(transpose((X+transpose(X,12) ) ,-5) ) ,4,6) +transpose(((arpeggio((arpeggio(X) +transpose(((transpose(transpose(X,-5) ,-7) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ) +transpose(transpose((transpose(X,-5) |(X+transpose(X,12) ) ) ,4) ,4) ) +transpose(transpose(transpose(step(echo(X,4,6) ,12) ,-7) ,-5) ,7) ) ,12) ) ,7) ) ,4) +transpose(transpose(transpose(transpose((((step(X,12) +transpose(arpeggio(echo(shuffle(transpose(X,-5) ) ,4,6) ) ,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose((echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) +transpose(((arpeggio(X) +transpose(echo((X+transpose(shuffle(X) ,12) ) ,4,6) ,4) ) +transpose(echo(arpeggio(transpose(X,-7) ) ,4,6) ,7) ) ,12) ) ,7) ) ,-7) ,4) ,-5) ,4) ) +transpose(step(((shuffle((transpose(transpose(shuffle((X|X) ) ,-5) ,-7) |shuffle(transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) ) ) ) +transpose(((((transpose((((echo(X,4,6) +echo(transpose(X,-7) ,4,6) ) +transpose(X,12) ) +transpose(((transpose(X,-5) +transpose(shuffle(X) ,7) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,12) ) ,-7) +transpose(shuffle(transpose(transpose((X+X) ,-7) ,-5) ) ,4) ) +transpose((((step(transpose(X,-5) ,12) +transpose(X,7) ) +transpose(transpose(((X+transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) +transpose(step((transpose(transpose(X,-7) ,-5) +transpose(X,12) ) ,12) ,7) ) ,7) ) +transpose((transpose(echo(echo(X,4,6) ,4,6) ,-7) +transpose(transpose((X|X) ,-7) ,7) ) ,4) ) +transpose(transpose(shuffle(step(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,12) ,12) ) ,-5) ,7) ) ,12) ) +step(transpose(step(((X|transpose(transpose(X,-5) ,-7) ) +transpose(step((arpeggio(X) +((X+transpose(step(X,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,12) ,12) ) ,12) ,-7) ,12) ) ,12) ,7) ) ) ,12) )
random seed used was 0 EXPR = (echo((echo(((echo((transpose(X,-5) +transpose((X+X) ,7) ) ,4,6) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) +transpose(X,7) ) ,4,6) +transpose((((((transpose(X,-7) |transpose(step((X+transpose(transpose(X,4) ,12) ) ,12) ,-5) ) +transpose(step(((transpose(X,-7) +((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) +transpose(shuffle(X) ,12) ) ,12) ,4) ) +transpose((step(transpose(X,-7) ,12) +transpose(transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,4) ) ,7) ) +transpose(transpose(arpeggio(transpose(X,-7) ) ,-5) ,12) ) +transpose((arpeggio(transpose(step(X,12) ,-7) ) +transpose(step(echo(X,4,6) ,12) ,12) ) ,7) ) ,12) ) ,4,6) +transpose((((transpose(step(((transpose(((X+transpose(X,12) ) +transpose(arpeggio(X) ,7) ) ,-5) +transpose(step(X,12) ,12) ) +transpose((X+transpose((shuffle(X) |echo(X,4,6) ) ,12) ) ,7) ) ,12) ,-5) +(((shuffle(X) +(shuffle(X) |X) ) +transpose((echo(transpose(transpose(echo(X,4,6) ,-5) ,-5) ,4,6) |((step(((transpose((X+transpose(X,7) ) ,4) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) +step(X,12) ) ,12) +transpose((((X+transpose(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ,4) ) +transpose(arpeggio(echo(transpose(echo(X,4,6) ,-7) ,4,6) ) ,7) ) ) ,12) ) +transpose(((echo(step(X,12) ,4,6) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|transpose(X,-5) ) ,4) ) +transpose(X,7) ) ,-7) ,7) ) +transpose((((((X+transpose(X,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,7) ) |((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(echo((X+transpose(echo(X,4,6) ,12) ) ,4,6) ,7) ) ,7) ) ,7) ) ) +transpose((step((shuffle(transpose(transpose(((X+transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(((X|X) +transpose(step(transpose(X,-5) ,12) ,12) ) ,7) ) ,-7) ,-7) ) +transpose(transpose(echo(echo(echo(transpose(X,-7) ,4,6) ,4,6) ,4,6) ,-7) ,12) ) ,12) +transpose(transpose((((arpeggio(((((arpeggio(transpose(X,-5) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) +transpose(transpose((transpose(X,4) +transpose(transpose(X,4) ,7) ) ,-7) ,4) ) +transpose(transpose(transpose(shuffle(X) ,-5) ,-7) ,7) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) |(shuffle(X) +transpose((transpose(arpeggio(X) ,-5) +transpose(shuffle(transpose(X,-7) ) ,-5) ) ,12) ) ) +transpose(transpose(arpeggio(shuffle(transpose((X|X) ,4) ) ) ,-5) ,12) ) +transpose(transpose(step(arpeggio(arpeggio(transpose(X,-7) ) ) ,12) ,-5) ,7) ) ,-7) ,12) ) ,4) ) +transpose((arpeggio(transpose((transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,-7) ) +transpose(transpose((echo(arpeggio(((echo(X,4,6) +transpose((transpose(X,4) |(X+transpose(X,12) ) ) ,4) ) +transpose(step(X,12) ,7) ) ) ,4,6) +step(((shuffle(step(X,12) ) +transpose(((transpose(X,-7) |transpose(X,-5) ) |transpose((X+X) ,-5) ) ,7) ) +transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(step(arpeggio(X) ,12) ,-5) ) ,7) ) ,12) ) ,-7) ,12) ) ,7) ) ,7) )
random seed used was 0


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