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 16 generations the expression "X" became this:
shuffle(((arpeggio(((((transpose(echo(transpose(X,-5) ,4,6) ,4) +transpose(transpose(transpose(shuffle((((X+transpose(X,7) ) |(X+transpose(step(X,12) ,7) ) ) +transpose(((shuffle(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ) ,-5) ,4) ,4) ) +transpose(((echo(echo(((transpose((X+transpose(X,7) ) ,-5) +transpose(echo(X,4,6) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) ,4,6) +transpose((transpose(arpeggio(((X+X) +X) ) ,4) +transpose((((shuffle(shuffle(X) ) +transpose((transpose(arpeggio(X) ,-7) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((((echo((X+transpose(X,7) ) ,4,6) +transpose(step(X,12) ,7) ) +transpose(X,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(shuffle(step(arpeggio((step(X,12) |shuffle(X) ) ) ,12) ) ,4) ,7) ) ,7) ) +transpose(transpose(((((X+transpose(X,7) ) +step(X,12) ) |arpeggio(X) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,-7) ,4) ) +transpose(step((transpose(arpeggio(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) +transpose(echo(((echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) +transpose(transpose(X,4) ,12) ) +transpose(((((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose((transpose(arpeggio(X) ,4) |echo(X,4,6) ) ,12) ) ,12) ) ,4,6) ,7) ) ,12) ,7) ) ) |((echo(transpose(((arpeggio(X) +transpose(X,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,-7) ,4,6) +transpose((shuffle(transpose(step((X+X) ,12) ,4) ) +arpeggio((arpeggio(echo(X,4,6) ) |(echo(arpeggio(X) ,4,6) +transpose(((transpose(X,-5) +(X+X) ) +transpose(((echo(X,4,6) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,12) ) ) ) ) ,4) ) +transpose(arpeggio((((transpose(X,-5) |X) +transpose(((X|X) |transpose(X,4) ) ,7) ) +transpose(step((X|X) ,12) ,7) ) ) ,7) ) ) +transpose(arpeggio(((echo(((X+transpose(shuffle(X) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) +arpeggio(X) ) +transpose(((((shuffle((step(X,12) +transpose(((X+transpose(X,7) ) +X) ,7) ) ) +transpose((arpeggio(X) +transpose(arpeggio(shuffle(X) ) ,12) ) ,4) ) +transpose(echo((shuffle(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,7) ) +transpose(shuffle(shuffle((transpose(X,-5) +transpose((echo(X,4,6) |transpose(X,4) ) ,7) ) ) ) ,4) ) +transpose(step(step((shuffle(X) |X) ,12) ,12) ,7) ) ,7) ) ) ,12) ) )
random seed used was 10 EXPR = transpose(transpose(((transpose(transpose(transpose((transpose((transpose((step((transpose(X,-5) +echo(X,4,6) ) ,12) +((X+transpose(X,4) ) +transpose((X+X) ,7) ) ) ,-5) +((transpose(echo((transpose(X,-5) +transpose(arpeggio(X) ,7) ) ,4,6) ,-7) +transpose(((transpose(step(step(transpose(X,-5) ,12) ,12) ,-7) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose(transpose(echo(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4,6) ,-7) ,7) ) ,4) ) +transpose(transpose(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4,6) ,-5) ,7) ) ) ,-7) +transpose(((arpeggio(echo((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ,4,6) ) +transpose((shuffle(shuffle(X) ) +transpose(arpeggio((X+X) ) ,7) ) ,4) ) +transpose(transpose((step(shuffle(X) ,12) +transpose(step(X,12) ,-7) ) ,4) ,7) ) ,7) ) ,-5) ,-5) ,-7) +transpose((echo((echo((((((echo(step(echo(X,4,6) ,12) ,4,6) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) |step((((transpose(arpeggio(X) ,-7) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) +transpose(transpose((X|X) ,-5) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,12) ) +transpose((transpose(arpeggio(transpose(step(X,12) ,-5) ) ,4) +((transpose((X|echo(X,4,6) ) ,4) +((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ) +transpose(transpose((transpose(X,4) |echo(X,4,6) ) ,-5) ,7) ) ) ,4) ) +transpose(echo(echo(shuffle(arpeggio((X+transpose(X,7) ) ) ) ,4,6) ,4,6) ,7) ) ,4,6) +transpose(((echo(arpeggio((((step((X|X) ,12) +transpose(step((shuffle(X) +arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) +transpose(((transpose((X+X) ,-5) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,12) ) |arpeggio(X) ) ,7) ) ) ,4,6) +transpose(transpose(transpose((((arpeggio((X+transpose(X,7) ) ) +transpose(shuffle(shuffle(arpeggio(X) ) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) |transpose(transpose((arpeggio(X) +X) ,-5) ,-7) ) ,-7) ,-5) ,4) ) +transpose(echo(echo(transpose((transpose(transpose(X,-5) ,-5) +transpose(shuffle(echo(echo(X,4,6) ,4,6) ) ,12) ) ,-7) ,4,6) ,4,6) ,7) ) ,12) ) ,4,6) +transpose(((((step(transpose(((((transpose(X,4) +(X+transpose(X,7) ) ) |X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ,12) +transpose(shuffle(shuffle((X+transpose(X,7) ) ) ) ,4) ) +transpose((transpose(X,4) +transpose(echo(arpeggio(step(X,12) ) ,4,6) ,7) ) ,7) ) +transpose(step((echo((step(X,12) +transpose(arpeggio(X) ,12) ) ,4,6) +transpose(((arpeggio(echo((X|X) ,4,6) ) +transpose(step((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ,4) ) +transpose(arpeggio(transpose(((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) ,7) ) ,12) ) ,12) ,7) ) +transpose((transpose(transpose((X+transpose(X,12) ) ,4) ,-7) |(echo(step(step((transpose(X,4) +transpose((X|X) ,7) ) ,12) ,12) ,4,6) +transpose(step((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) |transpose((X+transpose(X,7) ) ,-5) ) ,12) ,7) ) ) ,7) ) ,7) ) ,4) ) +transpose(step(step(((transpose(((shuffle(echo(X,4,6) ) +transpose((((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose((step(X,12) +transpose(X,7) ) ,7) ) +transpose(((shuffle(X) |echo(X,4,6) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,7) ) ,4) ) +transpose((((shuffle(X) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose((shuffle(transpose(X,-7) ) +(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ) ,7) ) ,4) +transpose(echo(step(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(echo(X,4,6) ,-5) ) ,4) ,12) ,4,6) ,4) ) +transpose((((shuffle((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(shuffle((X+X) ) ,7) ) ) +transpose(echo(X,4,6) ,7) ) +transpose(((shuffle(X) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(echo(transpose(echo((step(X,12) +echo(X,4,6) ) ,4,6) ,-5) ,4,6) ,7) ) ,7) ) ,12) ,12) ,7) ) ,-5) ,-5)
random seed used was 0

NOTE: Generated phrase was too large ( 20178 ) , it has been truncated at 5000 notes. EXPR = (arpeggio(step(step((echo((((((echo(X,4,6) +transpose(shuffle(X) ,12) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(step(transpose(((transpose(((X+X) +transpose(step(X,12) ,12) ) ,-5) +transpose(((transpose(X,4) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ,4) ) +transpose(X,7) ) ,7) ) |step((X|transpose(echo(echo(X,4,6) ,4,6) ,4) ) ,12) ) ,4) ,12) ,4) ) +transpose(step(arpeggio(arpeggio(X) ) ,12) ,7) ) ,4,6) +transpose(((echo(step(transpose(arpeggio(X) ,-5) ,12) ,4,6) +transpose(((arpeggio(transpose(X,-7) ) +transpose(transpose(X,-5) ,7) ) |step((((echo((X|(X+X) ) ,4,6) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((arpeggio(transpose(X,-5) ) |X) ,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,4) ) +transpose(((((transpose(X,4) +X) +transpose((((X+X) |(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) |((X|X) +X) ) ,7) ) |transpose(arpeggio(transpose(X,4) ) ,-5) ) +transpose(arpeggio((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) ,7) ) ,7) ) ,12) ,12) ) +transpose((((echo(echo(echo(transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ,4,6) ,4,6) ,4,6) +transpose(transpose((step(X,12) +(X+transpose(X,7) ) ) ,-7) ,4) ) +transpose(arpeggio(transpose((echo(arpeggio(((X+X) |X) ) ,4,6) +(((arpeggio(X) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(step(X,12) ,7) ) +transpose(((X+transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) +transpose(X,7) ) ,12) ) ) ,4) ) ,7) ) +(arpeggio(echo(step((X+transpose(arpeggio(X) ,4) ) ,12) ,4,6) ) +transpose(echo(shuffle((transpose(arpeggio(shuffle(X) ) ,-7) |transpose(transpose((echo(X,4,6) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) ,-7) ,4) ) ) ,4,6) ,12) ) ) ,12) )
random seed used was 0 EXPR = transpose(shuffle(transpose(((((shuffle((transpose(echo((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,4) +arpeggio(shuffle(transpose((X+transpose(X,7) ) ,-7) ) ) ) ) +transpose(arpeggio(step(((echo(X,4,6) +transpose((transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose((arpeggio((X|X) ) |X) ,7) ) ,12) ) ,4) ) +transpose(echo((((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) +transpose(transpose((echo(X,4,6) +transpose(step(X,12) ,7) ) ,-7) ,12) ) ,4,6) ,7) ) |(echo((echo((transpose((X+transpose(X,7) ) ,-5) +(X+transpose(X,12) ) ) ,4,6) +transpose((shuffle(step(X,12) ) +transpose(transpose(((X+transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ,4) ,7) ) ,7) ) ,4,6) |echo(transpose(((arpeggio(echo(X,4,6) ) +transpose((((X+transpose(X,7) ) +transpose(X,7) ) +transpose(arpeggio(X) ,7) ) ,7) ) +((shuffle(X) +transpose((transpose(transpose(X,-5) ,-5) +transpose((X+transpose(shuffle(X) ,7) ) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) ,4) ,4,6) ) ) +transpose((transpose(echo(transpose(echo(step(shuffle(X) ,12) ,4,6) ,4) ,4,6) ,-7) +transpose((transpose((transpose((X+transpose(echo((shuffle(X) +transpose(step(X,12) ,12) ) ,4,6) ,12) ) ,-5) +transpose(step(transpose(step(echo(X,4,6) ,12) ,-7) ,12) ,7) ) ,-7) +arpeggio(step((X+transpose(((arpeggio((X+X) ) +transpose((step(X,12) +transpose(X,-7) ) ,4) ) +transpose((transpose((X+transpose(X,7) ) ,4) +(transpose(X,-7) +transpose(echo(X,4,6) ,7) ) ) ,7) ) ,7) ) ,12) ) ) ,7) ) ,7) ) ,-7) ) ,4)
random seed used was 0


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