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.

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After 15 generations the expression "X" became this:
((transpose((shuffle((transpose(step(X,12) ,-5) +transpose(shuffle(transpose(X,-5) ) ,7) ) ) |((shuffle(transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ) ,-5) +transpose(transpose((step(arpeggio((X+transpose(X,12) ) ) ,12) +transpose(transpose((((transpose(X,-5) +transpose((X+X) ,4) ) +transpose((X+X) ,7) ) |(((X+transpose(X,12) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) ) ,4) ,12) ) ,4) ,12) ) +transpose((echo(shuffle(transpose(shuffle((((((X+X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) |arpeggio((X+transpose(X,7) ) ) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ) ,-5) ) ,4,6) |echo(transpose((step((transpose(((transpose(X,-5) +transpose((echo(X,4,6) +((X+X) +transpose(X,12) ) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,-7) +transpose((transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-7) +transpose(transpose(X,-5) ,4) ) ,12) ) ,12) +transpose((transpose(transpose(transpose(X,-5) ,4) ,4) +transpose(((arpeggio(X) +transpose(X,7) ) +transpose(X,7) ) ,7) ) ,-7) ) ,-7) ,4,6) ) ,12) )
random seed used was 3442951 EXPR = (transpose(transpose(((arpeggio(transpose((X+transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,-7) ) +transpose(step((step(echo((echo(X,4,6) +transpose(transpose(X,-5) ,7) ) ,4,6) ,12) +transpose(shuffle(((X+X) +transpose((arpeggio(X) |X) ,12) ) ) ,-5) ) ,12) ,4) ) +transpose(transpose(arpeggio(((((transpose(transpose((X+X) ,-5) ,4) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) ) +transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,7) ) +transpose((shuffle(X) +transpose(echo(X,4,6) ,12) ) ,12) ) +transpose(step(step((transpose(transpose(X,-5) ,-5) +transpose(shuffle(X) ,4) ) ,12) ,12) ,12) ) ) ,-7) ,7) ) ,-7) ,-7) +transpose(((transpose(arpeggio((arpeggio(shuffle(X) ) |step(transpose(((arpeggio(X) +transpose(arpeggio(X) ,12) ) |shuffle(transpose(X,-5) ) ) ,-7) ,12) ) ) ,-5) |step(((shuffle(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ) +transpose(transpose(transpose(X,4) ,-7) ,12) ) +transpose(transpose(((X+transpose(X,12) ) +transpose((transpose(X,4) +transpose(X,7) ) ,12) ) ,-7) ,-7) ) ,12) ) +transpose(transpose(transpose((transpose((shuffle((X+transpose(X,7) ) ) |arpeggio(transpose(X,-5) ) ) ,-5) +transpose((transpose((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(X,12) ) ,-7) +transpose(step(transpose(step(X,12) ,-5) ,12) ,7) ) ,7) ) ,-7) ,-7) ,-5) ) ,12) )
random seed used was 0 EXPR = echo((((transpose(shuffle((transpose(transpose(echo(echo(X,4,6) ,4,6) ,4) ,-5) |arpeggio(((transpose(X,-7) +transpose(X,7) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ) ) ) ,-7) |arpeggio(echo((transpose((transpose(shuffle(X) ,-5) +arpeggio(X) ) ,-5) +transpose(step((transpose(transpose(X,-5) ,-7) |(shuffle(transpose(X,-7) ) |(transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ) ) ,12) ,7) ) ,4,6) ) ) +transpose(transpose(step((((step((((X+transpose(X,4) ) +transpose(X,7) ) |(step(transpose(X,-5) ,12) +(transpose(step(X,12) ,4) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(transpose(X,-5) ) ,12) ) ,12) ) ) ) ,12) +transpose((transpose(X,-7) +transpose(step(transpose(X,-7) ,12) ,12) ) ,4) ) +transpose((arpeggio(X) +transpose(X,-7) ) ,7) ) +transpose(((transpose(echo((transpose((transpose(X,4) |echo(X,4,6) ) ,4) +transpose(((X+X) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,4,6) ,-7) +transpose(((transpose(((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(step(X,12) ,7) ) ,-7) +transpose(arpeggio((X+transpose((X+transpose(X,12) ) ,12) ) ) ,12) ) +transpose(transpose(arpeggio((X+transpose((X+transpose(X,12) ) ,7) ) ) ,4) ,7) ) ,4) ) +transpose(transpose((transpose(((X+X) +transpose(X,7) ) ,-7) +transpose((transpose(X,-5) +shuffle((X+transpose(X,12) ) ) ) ,7) ) ,-7) ,7) ) ,12) ) ,12) ,4) ,12) ) +((((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose(transpose(X,-5) ,4) ,-7) ) +transpose(step(X,12) ,7) ) +transpose(transpose(arpeggio(shuffle(X) ) ,-5) ,4) ) +transpose(((transpose(transpose(transpose(shuffle(X) ,-5) ,-7) ,4) +transpose(transpose(transpose((transpose(X,4) |(echo(X,4,6) +transpose(X,7) ) ) ,-5) ,-5) ,7) ) +transpose(transpose(arpeggio(arpeggio(transpose(transpose(transpose(X,-7) ,4) ,-7) ) ) ,-5) ,12) ) ,7) ) +transpose(transpose(shuffle(transpose(X,-7) ) ,-5) ,4) ) +transpose(echo(transpose(step(X,12) ,-7) ,4,6) ,7) ) ) ,4,6)
random seed used was 0 EXPR = (arpeggio((((arpeggio(((transpose((transpose(X,-7) +(transpose(echo((X|X) ,4,6) ,4) |((echo(X,4,6) +transpose(shuffle(X) ,7) ) +transpose(shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,12) ) ) ) ,4) +transpose(step(transpose(shuffle(((X+transpose(X,7) ) +transpose(X,7) ) ) ,4) ,12) ,4) ) +transpose((step(shuffle(X) ,12) +transpose(arpeggio(echo((X+transpose(X,12) ) ,4,6) ) ,7) ) ,7) ) ) +transpose((transpose((transpose(transpose(X,4) ,-7) +transpose(shuffle(X) ,7) ) ,-7) +transpose(((((((arpeggio(transpose(X,-5) ) +transpose(shuffle(X) ,7) ) +transpose((transpose(X,-5) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(arpeggio((step(echo(X,4,6) ,12) +transpose((transpose(transpose(X,-5) ,-7) |transpose(X,-5) ) ,7) ) ) ,7) ) +transpose(shuffle((X+transpose((X+transpose(X,7) ) ,12) ) ) ,7) ) +transpose(shuffle(shuffle(step(shuffle(transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,-5) ) ,12) ) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(transpose(transpose((((transpose(((X+transpose(((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,4) +transpose((((step(X,12) +transpose(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,-5) ,-7) ,-7) ,7) ) +transpose(shuffle(((((transpose(echo(X,4,6) ,-5) +transpose(echo((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(transpose(X,4) ,7) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose(step((echo(X,4,6) +transpose(transpose(X,-5) ,12) ) ,12) ,7) ) +transpose(transpose(shuffle(transpose(X,-5) ) ,-5) ,7) ) ,4,6) ,4) ) +transpose(transpose(transpose(((step(X,12) +transpose(X,-7) ) +transpose(transpose((transpose(X,4) +transpose(X,12) ) ,-5) ,12) ) ,-7) ,-5) ,7) ) +transpose(arpeggio((step(transpose((step(X,12) +transpose(echo(X,4,6) ,4) ) ,4) ,12) +(echo(shuffle(transpose(X,-7) ) ,4,6) +((step(arpeggio(X) ,12) +transpose((X|X) ,4) ) +transpose(((arpeggio(X) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ) ) ) ,4) ) +transpose((step(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,12) +transpose(step(((X+transpose(X,7) ) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,12) ) ,12) ,12) ) ,7) ) ) ,7) ) ) +transpose(((step((arpeggio(transpose(shuffle(shuffle(transpose(shuffle(transpose(X,-7) ) ,-5) ) ) ,-7) ) +transpose(echo(echo(echo(step(((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((transpose(X,-5) +transpose(X,7) ) ,12) ) ,12) ,4,6) ,4,6) ,4,6) ,7) ) ,12) +transpose(transpose((step((echo(echo(transpose(X,-7) ,4,6) ,4,6) +arpeggio((X+transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ) ) ,12) |arpeggio(((transpose(X,4) +transpose(echo(X,4,6) ,12) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,12) ) ) ) ,4) ,4) ) +transpose(((transpose(transpose(transpose(((X|((X+transpose(X,12) ) +transpose(X,7) ) ) +transpose((transpose(X,4) +transpose(X,12) ) ,12) ) ,-5) ,-5) ,-7) +transpose((transpose(((shuffle(X) +transpose(step(X,12) ,12) ) |(transpose(transpose(transpose(X,-7) ,-5) ,-5) +transpose(((transpose(X,-5) +transpose(X,7) ) +transpose(transpose(echo(X,4,6) ,-5) ,12) ) ,12) ) ) ,4) +transpose(echo((((((((transpose(X,-7) +transpose(step(X,12) ,12) ) +transpose(transpose(X,-7) ,12) ) +((X+transpose(transpose(X,4) ,4) ) +transpose(shuffle(X) ,7) ) ) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose((transpose(transpose(echo(X,4,6) ,-7) ,-7) +transpose((shuffle(transpose(X,-7) ) |(X+X) ) ,7) ) ,7) ) ,4,6) ,12) ) ,7) ) +transpose(echo((((transpose(transpose(shuffle(shuffle((transpose(X,4) +transpose(transpose(X,-7) ,12) ) ) ) ,-5) ,4) +transpose(transpose(arpeggio((echo(X,4,6) +transpose(transpose(X,-7) ,7) ) ) ,-5) ,4) ) +transpose(((transpose(echo((step((transpose(X,-7) +transpose(X,-5) ) ,12) +((step(X,12) |X) +transpose(transpose(X,4) ,12) ) ) ,4,6) ,-7) +transpose(arpeggio((transpose(transpose(echo(shuffle(X) ,4,6) ,-5) ,-5) |arpeggio(step(shuffle((X+transpose(X,7) ) ) ,12) ) ) ) ,4) ) +transpose(shuffle(transpose(transpose(shuffle(transpose((X+transpose(X,12) ) ,4) ) ,-7) ,-7) ) ,7) ) ,7) ) +transpose(transpose((X+transpose(step(X,12) ,12) ) ,4) ,7) ) ,4,6) ,7) ) ,7) ) ,-5) )
random seed used was 0

NOTE: Generated phrase was too large ( 5336 ) , it has been truncated at 5000 notes.


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