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

NOTE: Generated phrase was too large ( 7030 ) , it has been truncated at 5000 notes. EXPR = ((((arpeggio(echo((step((((X|X) +transpose(transpose(X,-7) ,7) ) +transpose(shuffle(X) ,12) ) ,12) +transpose(arpeggio(transpose(echo((X|X) ,4,6) ,4) ) ,7) ) ,4,6) ) +((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(((((X+transpose(X,12) ) +transpose(X,7) ) +(X|echo(X,4,6) ) ) +transpose(step(step(X,12) ,12) ,7) ) ,4) ) +transpose(transpose(((X+transpose(X,12) ) +shuffle(shuffle(X) ) ) ,4) ,7) ) +((((X+transpose(transpose(X,4) ,12) ) +transpose((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(((shuffle(X) |X) +echo(X,4,6) ) ,7) ) +transpose(((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(shuffle(echo((X|X) ,4,6) ) ,4) ) +transpose(step(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ,7) ) ,12) ) ) ) +transpose((transpose(((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,12) ) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(transpose(shuffle(((X+transpose(X,7) ) +X) ) ,-5) ,7) ) ,7) ) ,-5) +echo(echo(arpeggio(transpose(step(X,12) ,-7) ) ,4,6) ,4,6) ) ,12) ) +transpose(((transpose(transpose(shuffle(transpose(echo(echo(transpose(X,4) ,4,6) ,4,6) ,4) ) ,4) ,-5) +transpose(transpose((transpose((step((((transpose(X,-7) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) |transpose(step(X,12) ,4) ) ,12) |step((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(shuffle(X) ) ) ,12) ) ,-5) +transpose((((((transpose(X,4) +transpose(step(X,12) ,7) ) |(X|X) ) +((X+transpose(X,12) ) +arpeggio(shuffle(transpose(X,4) ) ) ) ) +transpose((((shuffle(transpose(X,-5) ) +transpose(((X+transpose((X|X) ,12) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(step((transpose(X,-7) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,12) ,7) ) ,12) ) ,-5) ,12) ) +(((((arpeggio(((arpeggio(step(X,12) ) +transpose(transpose(X,-7) ,7) ) +transpose(X,7) ) ) +transpose(shuffle(arpeggio(step(transpose(X,-5) ,12) ) ) ,4) ) +transpose((((X+transpose(step(X,12) ,12) ) +transpose(((X+transpose((X+transpose(X,7) ) ,12) ) |(X+transpose(echo(X,4,6) ,12) ) ) ,7) ) +transpose(transpose((step((X+transpose(X,7) ) ,12) +transpose(step(X,12) ,7) ) ,4) ,12) ) ,7) ) +transpose(shuffle(transpose(echo(X,4,6) ,-5) ) ,7) ) +transpose((echo(((transpose((X+X) ,4) +transpose(step((shuffle(((X+transpose(X,7) ) +shuffle(X) ) ) +((X|X) |X) ) ,12) ,4) ) +transpose((shuffle(transpose(X,-5) ) +(((arpeggio(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(step(X,12) ,-5) ,7) ) ) ,7) ) ,4,6) +transpose(transpose((step(transpose(X,4) ,12) +transpose(transpose(transpose((step((X|X) ,12) +X) ,-5) ,-7) ,12) ) ,-5) ,7) ) ,7) ) +transpose(((((arpeggio((((((X+transpose(X,12) ) +transpose(X,12) ) |(X+transpose(X,-7) ) ) +transpose(shuffle(step(transpose(X,-5) ,12) ) ,12) ) |step((X|(X+transpose(X,7) ) ) ,12) ) ) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose((((X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) +transpose(step(X,12) ,12) ) |(((arpeggio(X) +transpose((echo(X,4,6) +transpose(X,12) ) ,12) ) |((((X+X) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose((X+transpose(X,7) ) ,12) ) ) ) ,7) ) +transpose(transpose(transpose(echo(step(X,12) ,4,6) ,-7) ,4) ,12) ) +transpose(step((echo(arpeggio(echo(X,4,6) ) ,4,6) +transpose(arpeggio(X) ,7) ) ,12) ,12) ) ,12) ) ) ,12) ) +transpose((shuffle((arpeggio(echo(arpeggio((X|X) ) ,4,6) ) +transpose(arpeggio(((transpose(arpeggio(transpose(transpose(X,-7) ,-5) ) ,-7) +transpose(((step(transpose(X,4) ,12) +transpose((arpeggio((echo(X,4,6) +X) ) +transpose(((((step(X,12) +step(X,12) ) +transpose((echo(X,4,6) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) |((X|X) +transpose((X+transpose((X|X) ,7) ) ,7) ) ) ,7) ) ,4) ) +transpose((echo(arpeggio((X+transpose(X,12) ) ) ,4,6) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ,7) ) ,4) ) +transpose(echo(arpeggio(step(echo((X|X) ,4,6) ,12) ) ,4,6) ,7) ) ) ,12) ) ) +transpose(((step(((echo(X,4,6) +transpose(X,12) ) +transpose(transpose(arpeggio(X) ,-5) ,-7) ) ,12) +transpose(step((transpose(((X+transpose(X,12) ) +(X+transpose(X,12) ) ) ,-5) +transpose(transpose((X+X) ,-5) ,-7) ) ,12) ,12) ) |transpose(step(shuffle(transpose(arpeggio((((X+transpose(shuffle(X) ,12) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,-5) ) ,12) ,4) ) ,12) ) ,12) )
random seed used was 0 EXPR = shuffle(echo(((((shuffle((echo(X,4,6) +transpose((shuffle(X) +(X+X) ) ,7) ) ) +transpose(transpose(((step(transpose((X+transpose(X,12) ) ,4) ,12) +transpose(shuffle(((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose(arpeggio(arpeggio(echo(X,4,6) ) ) ,7) ) ,-7) ,4) ) +transpose(transpose(transpose((step((((arpeggio(X) +transpose((X+transpose((X+X) ,7) ) ,4) ) +transpose(X,7) ) +transpose(arpeggio(transpose((X|X) ,4) ) ,12) ) ,12) +(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,4) +shuffle(arpeggio(X) ) ) ) ,-7) ,4) ,7) ) +echo(transpose((X+transpose(transpose(X,-7) ,12) ) ,4) ,4,6) ) +transpose((arpeggio((((transpose(((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(transpose((transpose(X,-7) |(X+transpose(X,12) ) ) ,-7) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(transpose(arpeggio((step(transpose(X,-7) ,12) |step(X,12) ) ) ,-7) ,12) ) ) +transpose(step((((X|shuffle(X) ) +transpose(step(transpose((X+transpose(X,12) ) ,4) ,12) ,12) ) |(((X+X) +transpose((X+transpose(X,12) ) ,12) ) +transpose(step(((((X+X) +transpose((X+X) ,4) ) +transpose(shuffle(X) ,7) ) |((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ) ,12) ,7) ) ) ,12) ,12) ) ,12) ) ,4,6) )
random seed used was 0


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