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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After 13 generations the expression "X" became this:
shuffle((transpose(step(transpose(shuffle((echo(X,4,6) +transpose(transpose(step(X,12) ,-5) ,12) ) ) ,-7) ,12) ,-5) +transpose((step(transpose(X,-7) ,12) +transpose(((echo((arpeggio(((transpose(X,-7) +transpose((echo(X,4,6) +transpose(X,12) ) ,7) ) +transpose(step(((echo(X,4,6) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,12) ,7) ) ) +echo(((X+transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ) ,4,6) +transpose(((((transpose(step(X,12) ,-7) +transpose(shuffle(step(shuffle(X) ,12) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) +transpose(step(transpose((arpeggio(X) +transpose(((X|X) +transpose(X,7) ) ,12) ) ,-7) ,12) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) ,4) ) +transpose((step(transpose((X+transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,-5) ,12) +shuffle(transpose(X,4) ) ) ,7) ) ,12) ) ,12) ) )
random seed used was 1 EXPR = (((shuffle(transpose(shuffle((transpose(((X+transpose(X,12) ) +transpose(arpeggio(X) ,7) ) ,-7) +transpose(arpeggio(transpose(transpose(transpose(X,4) ,4) ,-5) ) ,12) ) ) ,-7) ) +transpose(transpose(transpose(arpeggio(((arpeggio(echo(X,4,6) ) +transpose(shuffle(X) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) ) ,-7) ,4) ,4) ) +transpose(((echo(((((arpeggio(step(X,12) ) |(arpeggio(X) +transpose(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ,12) ) ) +transpose(echo(echo(transpose(X,-7) ,4,6) ,4,6) ,7) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose(((shuffle((X+transpose(X,7) ) ) +transpose((X+transpose((X+X) ,12) ) ,12) ) |arpeggio(transpose(((X+transpose(step(X,12) ,7) ) +transpose(X,-5) ) ,-7) ) ) ,7) ) ,4,6) +transpose(step((((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose((transpose(X,-7) |step(X,12) ) ,4) ,7) ) ,12) ,4) ) +transpose((arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) +transpose(echo(transpose(transpose(X,-7) ,-7) ,4,6) ,7) ) ,7) ) ,7) ) +((arpeggio((shuffle((transpose(echo(X,4,6) ,-7) +transpose(transpose(shuffle(step(X,12) ) ,-7) ,7) ) ) +transpose((((transpose(X,-7) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,12) ) ,4) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,7) ) +(step(echo(X,4,6) ,12) +transpose(step((step(X,12) +transpose(transpose(X,-5) ,12) ) ,12) ,7) ) ) ,7) ) ) +transpose((step((arpeggio(transpose(transpose(X,4) ,-7) ) +transpose((transpose(X,-7) |X) ,12) ) ,12) +transpose(((((((shuffle(transpose(shuffle(X) ,4) ) +((transpose(X,-7) +transpose((arpeggio(X) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(transpose(step(echo(transpose(X,-7) ,4,6) ,12) ,-7) ,4) ) +transpose(echo((echo(echo(X,4,6) ,4,6) +((step(X,12) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(X,7) ) ) ,4,6) ,7) ) +transpose(arpeggio(transpose(transpose(X,-7) ,-5) ) ,7) ) +transpose(transpose(((X+transpose(transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,-5) ,7) ) +transpose(shuffle(arpeggio((transpose(echo(X,4,6) ,-7) +transpose(X,12) ) ) ) ,12) ) ,-5) ,4) ) +transpose(transpose((transpose((X+transpose(X,12) ) ,4) +transpose(transpose((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) ,-7) ,12) ) ,4) ,7) ) ,12) ) ,4) ) +transpose(step((arpeggio((step((X+X) ,12) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) +transpose(transpose((((transpose(X,4) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(X,7) ) |(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(X,-5) ) ) ,-5) ,12) ) ,12) ,7) ) )
random seed used was 0 EXPR = ((((transpose(shuffle((step(X,12) +transpose(((transpose((X+shuffle(X) ) ,-7) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) ,12) ) ) ,-7) +transpose(((echo((((echo(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ,4,6) ,4,6) +transpose(echo(shuffle((X+transpose(X,12) ) ) ,4,6) ,12) ) |transpose(arpeggio(transpose(X,-7) ) ,-7) ) +transpose(arpeggio(transpose(echo(((transpose((X+transpose(X,7) ) ,-7) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4,6) ,-7) ) ,12) ) ,4,6) +transpose(((((transpose(transpose(step(X,12) ,-7) ,-7) +transpose(transpose(echo(shuffle(echo((X+X) ,4,6) ) ,4,6) ,4) ,7) ) |step((transpose(X,-5) +transpose(X,7) ) ,12) ) |((X+X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ) +transpose(shuffle((step(transpose(step(X,12) ,-5) ,12) +transpose(((transpose((X+transpose(X,12) ) ,4) +transpose(step(((transpose(X,4) +transpose((X+X) ,12) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,12) ,7) ) +transpose(transpose(echo(step(X,12) ,4,6) ,-5) ,-7) ) ,7) ) ) ,12) ) ,4) ) +transpose(transpose(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) +transpose(transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,7) ) ,4,6) ,-7) ,7) ) ,4) ) +transpose(transpose(((transpose((transpose(X,-7) +transpose((X+transpose((X+X) ,12) ) ,12) ) ,-5) +transpose(arpeggio((X+X) ) ,12) ) |(transpose(shuffle((((transpose(X,-7) +(X+transpose(X,12) ) ) +(X+transpose(X,12) ) ) +step((transpose(X,-7) +transpose((X+X) ,7) ) ,12) ) ) ,-7) +transpose(transpose((step(step(((X+transpose(X,7) ) +transpose(X,7) ) ,12) ,12) +echo(shuffle(X) ,4,6) ) ,-7) ,12) ) ) ,-7) ,7) ) +transpose((echo(echo(arpeggio(transpose(arpeggio(echo((X|X) ,4,6) ) ,-7) ) ,4,6) ,4,6) +transpose(arpeggio(echo((shuffle(echo(step(((transpose(X,-7) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ,4,6) ) +transpose(((X+transpose(shuffle(X) ,12) ) +(arpeggio((X+transpose(X,12) ) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) ) ,4,6) ) ,7) ) ,7) ) |((transpose((echo((transpose(echo(shuffle(X) ,4,6) ,-7) +transpose(transpose(((X+X) +transpose((step(X,12) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,-7) ,7) ) ,4,6) +((step(X,12) +transpose((X+X) ,12) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ) ,-5) +transpose(((((shuffle((transpose(transpose(transpose(X,4) ,-7) ,-7) +transpose((X|X) ,12) ) ) +transpose(transpose(step(((echo(transpose(X,-7) ,4,6) +transpose(transpose(X,-7) ,12) ) |((transpose(X,-7) +transpose(X,12) ) |((X+transpose(transpose(X,4) ,12) ) |((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ) ) ) ,12) ,-5) ,4) ) +transpose((echo((X+transpose(shuffle(X) ,12) ) ,4,6) |arpeggio(echo((X+transpose(X,-5) ) ,4,6) ) ) ,7) ) +transpose((echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) |(step((step(X,12) |X) ,12) +transpose(arpeggio(X) ,12) ) ) ,4,6) +transpose(((step((echo((((X|X) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) +transpose((transpose((transpose(X,-7) +transpose(X,12) ) ,-7) +transpose(transpose((X+X) ,4) ,12) ) ,7) ) ,12) +((step(step((step(X,12) +(X+transpose(X,7) ) ) ,12) ,12) +transpose(transpose(transpose((((step(X,12) +X) +transpose(X,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,-7) ,4) ,4) ) +transpose(transpose((((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) |(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,7) ) ) +transpose(((echo(transpose(X,-7) ,4,6) +transpose(arpeggio(transpose(echo(X,4,6) ,-7) ) ,7) ) +step((X+transpose(X,7) ) ,12) ) ,7) ) ,7) ) ,4) ) +transpose(arpeggio(transpose((transpose(transpose(X,-7) ,-7) +(((step(transpose(X,-5) ,12) +transpose(shuffle(arpeggio(X) ) ,7) ) +transpose((arpeggio(X) +transpose((echo(shuffle(X) ,4,6) |(X+transpose(X,7) ) ) ,12) ) ,4) ) +transpose(transpose(((X+X) +transpose(echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ,12) ) ,-7) ,7) ) ) ,4) ) ,7) ) ,4) ) +transpose(shuffle((transpose((shuffle(((X+transpose(X,7) ) |transpose(X,4) ) ) +transpose(transpose((step(X,12) +transpose((X|X) ,12) ) ,4) ,12) ) ,-5) +transpose(((transpose(((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ,4) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,7) ) |transpose(echo((X|X) ,4,6) ,4) ) ,7) ) ) ,7) ) )
random seed used was 0

NOTE: Generated phrase was too large ( 5900 ) , it has been truncated at 5000 notes. EXPR = (((arpeggio((transpose((transpose(arpeggio((transpose((((X+X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) +transpose(step(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ,12) ,7) ) ) ,-5) |step((arpeggio(transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ) +transpose(shuffle((step(step(X,12) ,12) |((X+X) +transpose(X,7) ) ) ) ,7) ) ,12) ) ,-7) +transpose((((step(X,12) +transpose(step(X,12) ,12) ) +transpose(X,12) ) +transpose(arpeggio(transpose(arpeggio(X) ,-7) ) ,7) ) ,12) ) ) +transpose((transpose(arpeggio(((transpose(((transpose(step((X+transpose(X,7) ) ,12) ,-7) +transpose(arpeggio(transpose(X,-7) ) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) ,-7) +echo(((transpose((X|X) ,-7) +transpose(((transpose(X,-5) +X) +transpose(shuffle(X) ,12) ) ,4) ) +transpose((((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,12) ) +shuffle(X) ) ,12) ) ,7) ) ,4,6) ) +transpose(transpose(echo(transpose(X,-7) ,4,6) ,4) ,12) ) ) ,-7) +transpose(arpeggio(shuffle(arpeggio(((X+transpose(transpose(X,4) ,12) ) +shuffle(X) ) ) ) ) ,12) ) ,7) ) +transpose((step(((step(transpose(transpose(X,4) ,4) ,12) |arpeggio(shuffle(step((X+X) ,12) ) ) ) +transpose(arpeggio((((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) +transpose(shuffle(echo(X,4,6) ) ,12) ) ) ,7) ) ,12) +transpose(shuffle(((shuffle(shuffle((step(X,12) +transpose(echo(X,4,6) ,7) ) ) ) +transpose(((shuffle(transpose(X,4) ) +transpose(X,12) ) +transpose((X+transpose(X,7) ) ,-7) ) ,4) ) +transpose(((((transpose((X+X) ,-5) |arpeggio((shuffle(X) +X) ) ) +transpose((transpose(X,-5) +X) ,7) ) +transpose(shuffle(echo(echo(X,4,6) ,4,6) ) ,4) ) +transpose((step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) |(transpose(transpose(X,-7) ,4) +transpose(transpose(shuffle(X) ,-7) ,7) ) ) ,7) ) ,7) ) ) ,12) ) ,4) ) +transpose(transpose(((step(transpose((X|X) ,-7) ,12) |echo(transpose(arpeggio((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) ,4,6) ) +transpose(transpose(((((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(((X|step(X,12) ) +transpose(echo(X,4,6) ,12) ) ,7) ) |(echo(echo(echo(X,4,6) ,4,6) ,4,6) +transpose(transpose(((X+X) +transpose(echo(X,4,6) ,12) ) ,-7) ,7) ) ) |(transpose(shuffle((X+transpose(X,12) ) ) ,-7) +shuffle(transpose(arpeggio(X) ,4) ) ) ) ,4) ,12) ) ,4) ,7) )
random seed used was 0


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