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 19 generations the expression "X" became this:
step(arpeggio(step(transpose(((((transpose(echo(shuffle((X+transpose((X|X) ,12) ) ) ,4,6) ,-5) +transpose(step(echo(arpeggio(((X+transpose(X,12) ) +X) ) ,4,6) ,12) ,7) ) +transpose(((((transpose(echo(X,4,6) ,-5) +X) +transpose(step(echo(echo(X,4,6) ,4,6) ,12) ,7) ) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ,-5) ) +(((shuffle(transpose((X+X) ,4) ) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose((X+X) ,7) ) +transpose(transpose(step(echo(X,4,6) ,12) ,-7) ,7) ) ) ,4) ) +transpose(echo((step(transpose((transpose(X,4) +transpose(transpose((X|X) ,-7) ,12) ) ,-5) ,12) |(transpose(echo((X+transpose(X,12) ) ,4,6) ,4) |echo((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(shuffle(X) ,4) ,12) ) ,4,6) ) ) ,4,6) ,7) ) +((((((echo(X,4,6) |step(X,12) ) +transpose(shuffle(step(X,12) ) ,12) ) +transpose(arpeggio(echo(step(X,12) ,4,6) ) ,4) ) +transpose((echo((arpeggio(transpose(X,-7) ) +transpose(shuffle(step(X,12) ) ,12) ) ,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) ,7) ) +transpose(step(transpose((echo(X,4,6) |arpeggio(shuffle(echo(X,4,6) ) ) ) ,-5) ,12) ,12) ) +transpose((((transpose(transpose((X|X) ,-7) ,-7) +transpose(step(transpose((X|X) ,4) ,12) ,-5) ) +transpose(transpose((arpeggio(echo(step(transpose(X,4) ,12) ,4,6) ) +step(((step(echo(arpeggio(X) ,4,6) ,12) +transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose((transpose(X,4) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,12) ) ,-5) ,12) ) +transpose((echo(transpose(step(echo(step(X,12) ,4,6) ,12) ,4) ,4,6) +(shuffle((X|X) ) |step(((X+transpose(echo(echo(X,4,6) ,4,6) ,12) ) +arpeggio((X|X) ) ) ,12) ) ) ,12) ) ,7) ) ) ,4) ,12) ) ,12)
random seed used was 853211 EXPR = (((shuffle(step((((shuffle(shuffle(transpose(shuffle(X) ,4) ) ) +transpose(((echo((echo(shuffle(((transpose(X,-7) +transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) +transpose((step(echo(X,4,6) ,12) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,12) ) ,4,6) +transpose(((echo(shuffle(arpeggio(X) ) ,4,6) +transpose(transpose(transpose(step(X,12) ,4) ,4) ,7) ) +transpose((shuffle(((X+transpose(X,12) ) +arpeggio(X) ) ) +transpose((transpose(X,-7) +transpose(transpose(shuffle(echo(X,4,6) ) ,-7) ,12) ) ,7) ) ,12) ) ,4) ) +transpose(arpeggio(echo(transpose(((X+transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose((X|X) ,7) ) ,-5) ,4,6) ) ,7) ) ,4) ) +transpose((transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |arpeggio(X) ) ) ,-7) |shuffle((transpose(transpose(arpeggio(X) ,-7) ,-7) +echo(X,4,6) ) ) ) ,7) ) +(echo((((transpose(echo(echo(X,4,6) ,4,6) ,-7) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,4) ,4) ) +transpose((echo(X,4,6) +transpose(X,-5) ) ,7) ) +((shuffle((X+transpose(X,12) ) ) |echo(echo(X,4,6) ,4,6) ) +transpose(transpose(transpose((X+X) ,-7) ,-7) ,12) ) ) ,4,6) +transpose(arpeggio(arpeggio((arpeggio(X) +transpose((step(X,12) |(X|X) ) ,12) ) ) ) ,-5) ) ) ,12) ) +transpose(((shuffle((transpose(shuffle(arpeggio(X) ) ,4) +transpose(shuffle(echo((X+transpose((X+X) ,12) ) ,4,6) ) ,7) ) ) +echo(transpose(((((transpose(transpose(((((step(transpose(X,-7) ,12) +transpose((X+(X+X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(X,4) ) +transpose(((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,7) ) ,-7) ,-7) +transpose(shuffle(echo(shuffle(transpose(X,4) ) ,4,6) ) ,-5) ) |transpose(((transpose(arpeggio(step(X,12) ) ,4) |echo(echo(transpose(X,4) ,4,6) ,4,6) ) +transpose(echo(transpose((shuffle(X) +transpose(echo(X,4,6) ,12) ) ,-5) ,4,6) ,7) ) ,-5) ) +transpose(((((step(arpeggio((X+transpose(X,12) ) ) ,12) +(transpose(step(step(X,12) ,12) ,-5) +step(X,12) ) ) +transpose((X+transpose(transpose(arpeggio(echo(echo(X,4,6) ,4,6) ) ,-7) ,12) ) ,4) ) +transpose(((transpose((X+transpose((X|X) ,12) ) ,-5) +transpose(arpeggio(transpose(X,-5) ) ,12) ) |arpeggio((X|echo(X,4,6) ) ) ) ,7) ) +(((shuffle(X) +transpose(arpeggio(arpeggio(X) ) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ) ,4) ) +transpose(step(arpeggio(echo((echo(shuffle(X) ,4,6) +transpose(step((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,12) ) ,4,6) ) ,12) ,7) ) ,-5) ,4,6) ) +transpose(echo(((echo(transpose(transpose(step(((X|X) +transpose(arpeggio(X) ,7) ) ,12) ,4) ,4) ,4,6) +transpose(echo(transpose(transpose(transpose(arpeggio(X) ,-7) ,4) ,-7) ,4,6) ,4) ) +transpose((shuffle(transpose(transpose(shuffle(transpose(transpose(X,4) ,-5) ) ,-7) ,-5) ) +((transpose(transpose(echo(X,4,6) ,-7) ,4) +(arpeggio(X) |transpose(X,-5) ) ) |echo(X,4,6) ) ) ,7) ) ,4,6) ,-5) ) ,12) ) +transpose(shuffle(((arpeggio(step((echo(arpeggio(transpose(((((step(X,12) +transpose(X,7) ) +transpose(shuffle((shuffle((X+transpose(X,7) ) ) +transpose(X,-7) ) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(transpose(transpose(X,4) ,4) +transpose((transpose(X,4) +X) ,12) ) ) ,7) ) |step(transpose(echo((X+X) ,4,6) ,4) ,12) ) ,-7) ) ,4,6) +(echo(transpose(transpose(transpose(shuffle((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,4) ,-7) ,-7) ,4,6) |(transpose(transpose(echo(shuffle(X) ,4,6) ,4) ,-7) +shuffle(transpose(shuffle(transpose(X,-5) ) ,-7) ) ) ) ) ,12) ) +((arpeggio(((transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) |step(((X|X) |arpeggio(X) ) ,12) ) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ) +transpose(((transpose((transpose(echo(X,4,6) ,-5) +X) ,-7) |transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ,-5) ) +transpose(arpeggio((transpose(shuffle(echo((X+transpose(X,7) ) ,4,6) ) ,4) +(((step(X,12) |step(X,12) ) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|step(X,12) ) ,12) ) ,7) ) ) ) ,12) ) ,7) ) +transpose(transpose((echo(echo(X,4,6) ,4,6) |(arpeggio(echo(X,4,6) ) +transpose(((X+transpose(transpose(X,-5) ,12) ) |echo(X,4,6) ) ,12) ) ) ,-5) ,7) ) ) +transpose(arpeggio(shuffle(arpeggio(transpose(arpeggio(transpose((arpeggio(echo(echo(X,4,6) ,4,6) ) +shuffle(echo(arpeggio(X) ,4,6) ) ) ,4) ) ,-7) ) ) ) ,7) ) ) ,12) ) +transpose(transpose(arpeggio(echo(arpeggio(echo(((arpeggio(X) +(step(X,12) |shuffle(X) ) ) |((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(shuffle(X) ,7) ) ,7) ) ) ,4,6) ) ,4,6) ) ,-7) ,-5) )
random seed used was 0

NOTE: Generated phrase was too large ( 6270 ) , it has been truncated at 5000 notes. EXPR = (((echo(step(arpeggio(transpose((transpose(shuffle(echo(arpeggio((X+X) ) ,4,6) ) ,-5) |(echo(step(arpeggio(((((X+transpose(step(X,12) ,12) ) +(X+transpose(shuffle(X) ,12) ) ) +transpose(((X+X) |step(X,12) ) ,4) ) +transpose((arpeggio(X) +((X|X) |(X+X) ) ) ,7) ) ) ,12) ,4,6) |(arpeggio((step(X,12) +transpose((arpeggio(X) +step(X,12) ) ,7) ) ) +echo(shuffle(arpeggio(arpeggio(X) ) ) ,4,6) ) ) ) ,-5) ) ,12) ,4,6) +transpose((((transpose(transpose((((step(((echo(transpose(X,-7) ,4,6) +transpose(transpose((echo(X,4,6) +shuffle(X) ) ,-5) ,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |(((X+X) +transpose((X|X) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ,12) +((((arpeggio((X+X) ) +transpose(X,4) ) +transpose((transpose(X,-5) +arpeggio(X) ) ,7) ) +(X+transpose(X,7) ) ) +step(step(X,12) ,12) ) ) +((((((((echo(X,4,6) |transpose(X,-5) ) |(((X|X) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) ) +echo(X,4,6) ) +shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(((shuffle(X) +transpose(transpose(X,4) ,4) ) +transpose(step(echo(arpeggio((X+transpose(X,7) ) ) ,4,6) ,12) ,7) ) ,4) ) +transpose(shuffle(transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) ,7) ) +transpose(transpose(transpose(arpeggio(shuffle(X) ) ,4) ,4) ,4) ) +transpose(echo(step((echo(((X|X) +transpose((X+transpose(X,7) ) ,12) ) ,4,6) +(arpeggio(X) +transpose((X|X) ,12) ) ) ,12) ,4,6) ,7) ) ) +transpose((step(((transpose(echo(X,4,6) ,-7) |arpeggio(X) ) +(echo(X,4,6) +transpose(X,7) ) ) ,12) +((X|(X|X) ) +transpose(echo(X,4,6) ,12) ) ) ,-5) ) ,-7) ,4) +transpose(echo(transpose(arpeggio(arpeggio(transpose((arpeggio(arpeggio(X) ) +transpose((echo(transpose(echo(X,4,6) ,-7) ,4,6) +transpose((transpose(X,-5) +transpose(X,7) ) ,7) ) ,12) ) ,-5) ) ) ,-5) ,4,6) ,4) ) +transpose(step((arpeggio((((transpose(X,-5) +transpose(X,-5) ) +transpose(((X+X) +X) ,12) ) +transpose((echo(echo((X+X) ,4,6) ,4,6) +X) ,12) ) ) +transpose((echo(((transpose(step(X,12) ,-5) +((X+X) +transpose(shuffle(X) ,12) ) ) +transpose(step((X+transpose(X,7) ) ,12) ,12) ) ,4,6) +transpose(transpose(arpeggio(echo(arpeggio(echo(X,4,6) ) ,4,6) ) ,4) ,12) ) ,12) ) ,12) ,7) ) +transpose(arpeggio(transpose(echo(step(shuffle(shuffle(transpose(shuffle(transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) ,-5) ) ) ,12) ,4,6) ,-7) ) ,7) ) ,4) ) +transpose(step((((transpose((echo(step(X,12) ,4,6) |(echo((X+transpose((X+transpose(X,12) ) ,12) ) ,4,6) |shuffle(echo((X+X) ,4,6) ) ) ) ,-5) +shuffle(((shuffle(shuffle(X) ) +echo(X,4,6) ) |echo(step(X,12) ,4,6) ) ) ) +transpose(shuffle(echo((echo(step(arpeggio(arpeggio(X) ) ,12) ,4,6) |transpose(step(X,12) ,-5) ) ,4,6) ) ,12) ) |(step(arpeggio(echo((transpose(X,-5) +transpose(transpose(X,-5) ,-7) ) ,4,6) ) ,12) +echo(echo((echo(transpose(transpose(X,-7) ,-7) ,4,6) |echo(echo(echo(X,4,6) ,4,6) ,4,6) ) ,4,6) ,4,6) ) ) ,12) ,7) ) +transpose(arpeggio(transpose(step(((arpeggio(transpose(arpeggio(echo(((step(transpose(arpeggio(X) ,-7) ,12) +transpose(shuffle(transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ) ,7) ) +shuffle(arpeggio(step(X,12) ) ) ) ,4,6) ) ,-5) ) +transpose(transpose(transpose(echo(step(((transpose(echo(X,4,6) ,-7) |echo((X+X) ,4,6) ) |arpeggio((X+transpose(X,7) ) ) ) ,12) ,4,6) ,4) ,-5) ,4) ) +transpose((step(shuffle(transpose(((echo(echo(transpose((shuffle(echo(X,4,6) ) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) ,-7) ,4,6) ,4,6) +transpose(shuffle(transpose(arpeggio((X+transpose(X,7) ) ) ,-5) ) ,12) ) |((((echo((transpose(arpeggio(X) ,4) +transpose(step(X,12) ,12) ) ,4,6) +transpose(arpeggio(step(echo(X,4,6) ,12) ) ,4) ) +transpose((transpose((X|X) ,-5) +transpose(echo(shuffle((transpose((X+X) ,-5) |shuffle(X) ) ) ,4,6) ,7) ) ,7) ) +transpose((transpose(transpose((transpose(transpose(X,-7) ,-5) +transpose(X,7) ) ,-5) ,-5) +transpose(echo(((X|X) +(X|X) ) ,4,6) ,12) ) ,4) ) +transpose(shuffle(transpose(arpeggio(X) ,4) ) ,7) ) ) ,4) ) ,12) +shuffle(echo(step(shuffle(step(transpose((((X+step(step(X,12) ,12) ) +transpose(echo(X,4,6) ,-7) ) +transpose(step(echo(X,4,6) ,12) ,7) ) ,4) ,12) ) ,12) ,4,6) ) ) ,7) ) ,12) ,-7) ) ,12) )
random seed used was 0

NOTE: Generated phrase was too large ( 13980 ) , it has been truncated at 5000 notes.


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