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:
transpose((step(((((echo(transpose((transpose(((transpose(arpeggio(X) ,4) +transpose((X+echo(X,4,6) ) ,4) ) +transpose((transpose(X,4) +transpose(X,7) ) ,7) ) ,-7) +transpose(transpose((transpose(transpose(X,-5) ,4) +echo(shuffle(transpose(X,-7) ) ,4,6) ) ,-5) ,12) ) ,-5) ,4,6) +transpose((transpose(((arpeggio(((X|X) +transpose(X,7) ) ) |(echo(X,4,6) +(transpose(step(X,12) ,-5) |((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ) ) ) +transpose((echo((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,4,6) +echo((X+X) ,4,6) ) ,12) ) ,-5) +transpose((transpose((X|(X+transpose(X,7) ) ) ,-7) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,-5) ) ,4) ) |((transpose(arpeggio(step(echo(((transpose(X,-5) +transpose(((step(X,12) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,12) ) ,-7) +((shuffle(echo((transpose(transpose(X,4) ,-5) +transpose(((transpose(transpose(X,-5) ,-7) +transpose(shuffle((X+X) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,4,6) ) +transpose(arpeggio(transpose(transpose((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) ,-5) ,-7) ) ,4) ) +transpose((((transpose((((X+transpose(X,7) ) +transpose(echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ,12) ) +transpose(step(((transpose(X,4) +transpose(X,4) ) +transpose((X|X) ,7) ) ,12) ,7) ) ,-7) +transpose(transpose(echo((X|((X+X) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) ,4,6) ,-5) ,12) ) +transpose(transpose(transpose(transpose((transpose(X,-5) +step((X+transpose(X,7) ) ,12) ) ,-5) ,4) ,-7) ,4) ) +transpose(step(transpose(((X+transpose(transpose(X,-5) ,7) ) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) ,-7) ,12) ,7) ) ,7) ) ) +((arpeggio(((transpose(arpeggio(shuffle(step(echo(X,4,6) ,12) ) ) ,-5) +((shuffle(X) +transpose(((step(X,12) +transpose(transpose(X,-5) ,4) ) +transpose((arpeggio(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ) +transpose(transpose((step(transpose(X,-5) ,12) +transpose((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(X,7) ) ,12) ) ,-5) ,7) ) ) +transpose(transpose(echo(transpose(((((((step(X,12) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) |transpose(arpeggio(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) ) +shuffle((((X+transpose(X,12) ) +transpose(((X|X) +transpose(shuffle(X) ,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ) +transpose((((((transpose((X+transpose(X,12) ) ,4) +transpose(transpose(step(X,12) ,-5) ,12) ) +transpose((step(step((X+X) ,12) ,12) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) ,4) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) +transpose((echo(((X+transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ,4,6) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,4) ) +transpose(((shuffle(shuffle(X) ) +transpose((X+(X+transpose(X,7) ) ) ,4) ) +transpose((((((X+transpose(X,12) ) +transpose(shuffle(X) ,12) ) +transpose(step(X,12) ,7) ) +transpose(((X+transpose(X,7) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ,4) ) +transpose((transpose((X+transpose(X,12) ) ,-7) +step(shuffle(X) ,12) ) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(transpose((arpeggio(X) +transpose(shuffle(X) ,7) ) ,-5) ,-5) ,7) ) ,-7) ,4,6) ,-5) ,4) ) +transpose(transpose((step(transpose(X,-7) ,12) +transpose(echo(X,4,6) ,7) ) ,-5) ,7) ) ) ) +transpose((arpeggio(transpose((arpeggio(((transpose(X,-5) +transpose((X|X) ,12) ) +transpose(((X+transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,12) ) ) +transpose((shuffle((echo(X,4,6) +step(step(X,12) ,12) ) ) +transpose(transpose((((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +step(transpose(X,-5) ,12) ) +transpose(transpose(arpeggio((X+X) ) ,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,12) ) ,12) ) ,-5) ) |transpose((((transpose(step(((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(shuffle(echo(X,4,6) ) ,-5) ,7) ) ,12) ,-5) +transpose(transpose((transpose(arpeggio(shuffle(X) ) ,-5) +transpose(transpose((((step(arpeggio(X) ,12) +transpose(transpose(X,4) ,12) ) +transpose(transpose((X|X) ,-5) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,-7) ,12) ) ,-5) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) |transpose((shuffle(arpeggio(step(X,12) ) ) +transpose(shuffle(((transpose(X,4) |echo(echo(X,4,6) ,4,6) ) +transpose(transpose((X+transpose(transpose(X,-5) ,7) ) ,4) ,12) ) ) ,7) ) ,-7) ) ,-7) ) ,4) ) +transpose(((((arpeggio((shuffle(transpose(echo((X+X) ,4,6) ,-7) ) +(transpose(((transpose(transpose(X,-5) ,-5) +transpose(step(transpose(transpose(X,-5) ,-5) ,12) ,4) ) +transpose(shuffle(transpose(transpose(X,-5) ,-5) ) ,7) ) ,4) +(arpeggio(step(X,12) ) +transpose((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ,7) ) ) ) ) +transpose(transpose(transpose(transpose(arpeggio(X) ,-5) ,-7) ,4) ,4) ) +transpose(shuffle((echo(echo(shuffle((X|X) ) ,4,6) ,4,6) +echo(echo(transpose(transpose(X,4) ,-5) ,4,6) ,4,6) ) ) ,7) ) +transpose((transpose(step(shuffle(shuffle(X) ) ,12) ,-7) |shuffle(((shuffle(shuffle(X) ) |transpose(transpose(X,4) ,-5) ) +transpose((step(shuffle(transpose(X,-5) ) ,12) +transpose(shuffle(X) ,12) ) ,12) ) ) ) ,4) ) +transpose(transpose((arpeggio(step((transpose(((X+transpose(X,12) ) +transpose(echo(X,4,6) ,12) ) ,-5) +transpose(transpose(shuffle((X+X) ) ,4) ,12) ) ,12) ) +transpose((step(transpose(((X+transpose(X,12) ) +shuffle(X) ) ,-5) ,12) +transpose((arpeggio((transpose(X,-5) +transpose(X,12) ) ) +transpose((shuffle(X) +X) ,-5) ) ,7) ) ,-5) ) ,-7) ,7) ) ,7) ) ,12) +transpose(transpose(transpose(transpose(echo(step((((arpeggio(transpose(transpose(transpose(X,4) ,4) ,-7) ) +transpose(transpose(transpose(transpose(transpose(X,4) ,-5) ,4) ,-5) ,7) ) +transpose(transpose((((((X+transpose(X,12) ) |(X+transpose(X,12) ) ) +X) +transpose((transpose(X,-5) |transpose(X,-5) ) ,12) ) +transpose(echo((arpeggio(transpose(X,-5) ) |transpose(arpeggio(X) ,-7) ) ,4,6) ,7) ) ,-7) ,12) ) +(shuffle(transpose((arpeggio((X+X) ) |(transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,-5) ) +echo(arpeggio((X+transpose(transpose(X,-7) ,12) ) ) ,4,6) ) ) ,12) ,4,6) ,-5) ,4) ,-7) ,12) ) ,-7)
random seed used was 853211 EXPR = echo(((shuffle(transpose(step(transpose(transpose(echo((echo(transpose((shuffle((arpeggio((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose((step(X,12) +transpose(transpose(X,-5) ,7) ) ,12) ) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,-7) ,4,6) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose((arpeggio(transpose(transpose(X,-5) ,-5) ) +transpose((transpose(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,-5) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,12) ) ,12) ) ) ,4,6) ,-5) ,-7) ,12) ,-5) ) +transpose(transpose(transpose(((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +X) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) +transpose((transpose((transpose(X,-5) |X) ,-5) +transpose(transpose(((X+transpose(X,7) ) +X) ,-7) ,12) ) ,7) ) ,-7) ,-7) ,4) ) +transpose(((transpose(((transpose(transpose(arpeggio(shuffle((X+transpose(step(transpose(step(X,12) ,-5) ,12) ,12) ) ) ) ,-5) ,4) +transpose(step(transpose(shuffle(transpose(transpose(X,-5) ,-7) ) ,4) ,12) ,12) ) +transpose(step(step(transpose(transpose(transpose(arpeggio(transpose((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) ,-7) ,-5) ,4) ,12) ,12) ,12) ) ,-5) +transpose(((transpose((transpose((echo(((X+transpose((X+transpose(transpose(X,-7) ,12) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,4,6) +transpose((transpose(((((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +transpose(((shuffle(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose((transpose(transpose(X,-7) ,4) +(X+transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) ,-5) |echo(step(arpeggio(X) ,12) ,4,6) ) ,12) ) ,-5) +transpose((((((echo(transpose(transpose(X,-5) ,-7) ,4,6) +transpose(transpose((echo(X,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,12) ) |transpose(transpose(transpose((((X+X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,12) ) +transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ,4,6) ,7) ) ,-7) ,-5) ,-7) ) +transpose(transpose((transpose(transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose(arpeggio(X) ,-5) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,-5) ,4) +transpose((arpeggio((echo(arpeggio(X) ,4,6) +transpose(echo(X,4,6) ,7) ) ) +transpose(transpose(transpose(transpose(X,4) ,4) ,-7) ,12) ) ,7) ) ,-7) ,4) ) +transpose(transpose(arpeggio(transpose(X,-5) ) ,-7) ,7) ) +transpose((((echo(X,4,6) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) +transpose(transpose(step(transpose(transpose(X,-5) ,-5) ,12) ,-7) ,12) ) |(echo(transpose(X,-5) ,4,6) +((X|step(X,12) ) +transpose(((transpose(X,-5) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,7) ) ) ) ,12) ) ,7) ) ,-5) +transpose(transpose(arpeggio(transpose(((((transpose(X,-5) +transpose(arpeggio((X+X) ) ,7) ) +transpose(((transpose(echo(X,4,6) ,-5) +transpose(((X|X) +transpose((X+X) ,12) ) ,4) ) +transpose(X,7) ) ,7) ) +transpose(arpeggio(transpose(transpose(transpose(transpose(X,-5) ,-5) ,4) ,-5) ) ,4) ) +transpose(((step(arpeggio(X) ,12) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,7) ) ,4) ) ,-5) ,7) ) +transpose(echo(transpose(((X|arpeggio(X) ) +transpose(arpeggio(((X+X) +transpose(X,12) ) ) ,7) ) ,-7) ,4,6) ,-5) ) ,4) ) +transpose(arpeggio((arpeggio(shuffle(transpose(step(arpeggio((transpose(transpose(X,-5) ,4) +transpose((step(X,12) |transpose(X,-7) ) ,12) ) ) ,12) ,-7) ) ) +transpose(transpose((transpose(echo((transpose(transpose(X,-5) ,-5) +transpose(transpose(transpose(X,-5) ,4) ,12) ) ,4,6) ,-5) +transpose(transpose(((((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((shuffle(X) +transpose(X,7) ) ,7) ) ,-7) ,7) ) ,4) ,4) ) ) ,7) ) ,7) ) ,4,6)
random seed used was 0

NOTE: Generated phrase was too large ( 7395 ) , it has been truncated at 5000 notes. EXPR = shuffle(shuffle(((((echo(transpose(arpeggio((((transpose(echo(X,4,6) ,-5) +transpose((X+X) ,7) ) +transpose((((transpose(X,4) +transpose(transpose((X+X) ,-5) ,4) ) +transpose((X+(X|X) ) ,7) ) |(transpose(X,-7) +transpose((X+transpose(arpeggio(X) ,7) ) ,12) ) ) ,4) ) +transpose(transpose((((X+transpose(X,12) ) +transpose((X+X) ,12) ) |(arpeggio(X) +transpose(shuffle(X) ,12) ) ) ,-5) ,7) ) ) ,4) ,4,6) +transpose(((echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) +transpose(step((transpose(shuffle(X) ,-5) +shuffle(X) ) ,12) ,12) ) +transpose((((shuffle((step((X+transpose(X,7) ) ,12) +(X+transpose(X,7) ) ) ) +transpose((((X+transpose(X,12) ) +X) |X) ,4) ) +transpose(((X+transpose(X,7) ) |transpose(X,-5) ) ,7) ) +transpose(arpeggio((((step(X,12) +transpose((X+transpose(X,12) ) ,12) ) +transpose((X+transpose(X,12) ) ,7) ) +shuffle(shuffle(X) ) ) ) ,-7) ) ,12) ) ,4) ) +transpose(echo(((arpeggio(arpeggio(((echo(X,4,6) +transpose(X,4) ) +transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ) ) +transpose(((((step(X,12) +(X+transpose(X,7) ) ) +transpose(((transpose(X,-7) +transpose(X,12) ) +transpose(X,-7) ) ,7) ) +transpose((X+transpose(transpose(X,-5) ,7) ) ,12) ) +transpose((transpose((transpose(X,-7) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) |((shuffle(X) +transpose((X+(X+X) ) ,7) ) +transpose(((X+transpose(X,12) ) +transpose((X|X) ,7) ) ,12) ) ) ,7) ) ,12) ) +transpose(transpose(arpeggio(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ) ,4) ,12) ) ,4,6) ,7) ) |shuffle(((echo(transpose(arpeggio(transpose(echo(X,4,6) ,4) ) ,-5) ,4,6) +transpose(shuffle((arpeggio(arpeggio(transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) ) ) +echo(shuffle(step(X,12) ) ,4,6) ) ) ,4) ) +transpose((step(step(transpose(X,-5) ,12) ,12) +transpose(echo(((X+transpose((X+X) ,7) ) +((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) ) ,4,6) ,12) ) ,7) ) ) ) +transpose((step(((transpose((transpose(transpose(transpose((echo(shuffle(X) ,4,6) +(transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,-7) ,-5) ,-5) +transpose(transpose(transpose(transpose(transpose(transpose(X,-5) ,-7) ,4) ,-5) ,-7) ,12) ) ,-7) +transpose(transpose(echo(echo((transpose(transpose(X,-5) ,-5) +transpose(((((transpose((X+transpose(X,12) ) ,-5) +transpose(X,4) ) +transpose(transpose(shuffle(transpose(X,-5) ) ,-5) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,4) ) |transpose(transpose((X+X) ,-5) ,-5) ) ,4) ) +transpose((shuffle(X) |(transpose((X+transpose(X,7) ) ,4) |arpeggio(X) ) ) ,7) ) ,12) ) ,4,6) ,4,6) ,-7) ,4) ) +transpose((transpose(((shuffle(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ) +transpose(step((X|X) ,12) ,12) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,4) +(transpose(echo(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,4,6) ,-7) +transpose(shuffle((echo((X|X) ,4,6) |((echo(X,4,6) +transpose(((X|X) +(X+transpose(X,12) ) ) ,4) ) +transpose(((X|X) +transpose(X,7) ) ,7) ) ) ) ,12) ) ) ,7) ) ,12) +echo((((shuffle((transpose((X+transpose(X,12) ) ,4) +transpose(shuffle(((transpose(X,-5) +transpose(X,12) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ) ,7) ) ) +transpose((((((X+transpose((X+transpose(X,7) ) ,12) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose(echo((transpose((X+transpose(X,7) ) ,-7) |(shuffle(X) +transpose(transpose(X,-5) ,7) ) ) ,4,6) ,7) ) |(transpose(((arpeggio(X) +transpose(transpose(X,-7) ,7) ) +transpose(X,12) ) ,-7) +transpose((transpose((X+transpose(X,7) ) ,-5) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) ,12) ) ) ,4) ) +transpose((((echo(echo(transpose((((X+transpose(X,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,-5) ,4,6) ,4,6) +transpose(((transpose(transpose(transpose(X,4) ,-5) ,-5) +transpose((transpose(echo(X,4,6) ,4) +transpose(shuffle(transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) ,12) ) ,4) ) +transpose(transpose(echo(arpeggio(transpose(X,-7) ) ,4,6) ,-5) ,7) ) ,12) ) +transpose(arpeggio(step(((X+transpose(X,12) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,12) ) ,4) ) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(arpeggio(X) ) ) ) ,7) ) ,7) ) +step((((transpose(arpeggio(step((X+transpose(transpose(X,-5) ,12) ) ,12) ) ,-5) +transpose(((arpeggio(step(step(transpose(X,-5) ,12) ,12) ) +transpose(((transpose((X+X) ,4) +transpose(arpeggio(transpose(transpose(X,4) ,-5) ) ,4) ) +transpose((transpose(transpose(X,-5) ,-5) +transpose(X,7) ) ,7) ) ,12) ) +transpose(shuffle(arpeggio((transpose(arpeggio(X) ,4) +transpose(((step(X,12) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ) ,12) ) ,4) ) +transpose((transpose((((arpeggio(X) |(X+transpose((X|X) ,12) ) ) +transpose((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ,-5) +transpose(((transpose((X|X) ,-7) +transpose(transpose(X,-7) ,7) ) +transpose(transpose((transpose(transpose(X,-5) ,-5) |(step(transpose(X,-7) ,12) +transpose((X+X) ,12) ) ) ,-7) ,7) ) ,7) ) ,7) ) +transpose(transpose(transpose(transpose((((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((transpose(step(X,12) ,4) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose((((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) +transpose((echo(transpose(X,-7) ,4,6) |step(X,12) ) ,12) ) ,7) ) ,4) ,-5) ,-5) ,12) ) ,12) ) ,4,6) ) ,12) ) ) )
random seed used was 0

NOTE: Generated phrase was too large ( 6843 ) , it has been truncated at 5000 notes.


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