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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Phrase for X:
# of Tracks:
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After 20 generations the expression "X" became this:
(arpeggio(arpeggio(((((transpose((transpose(transpose(transpose(step(X,12) ,-5) ,-7) ,-5) +(transpose((((X+transpose(X,12) ) +X) |arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) +transpose(transpose(X,-5) ,7) ) ) ,-5) +step(shuffle(((shuffle((X+transpose(X,12) ) ) +transpose(((X+X) +transpose(X,4) ) ,12) ) +((step(X,12) +transpose((X+X) ,7) ) +transpose(((((X+transpose(X,12) ) |(X|shuffle(X) ) ) +transpose((arpeggio(X) +step(X,12) ) ,4) ) +transpose((transpose(X,-7) +transpose((X+transpose(echo(X,4,6) ,12) ) ,7) ) ,7) ) ,12) ) ) ) ,12) ) +(transpose(transpose(transpose(transpose(X,4) ,-7) ,4) ,4) +transpose(((((X+(X+transpose(X,12) ) ) +transpose(transpose((X|X) ,-5) ,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose((X+X) ,-5) ) ,12) ) +arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ,7) ) ) +transpose(transpose(((shuffle((((echo(transpose(step(X,12) ,-7) ,4,6) +X) +transpose(transpose((step(X,12) |(X+X) ) ,-5) ,12) ) +transpose(step((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,-7) +transpose(echo((X|X) ,4,6) ,4) ) ,12) ,7) ) ) +echo(transpose((X|((X+X) |X) ) ,-5) ,4,6) ) |transpose(transpose(echo(arpeggio(transpose(X,-7) ) ,4,6) ,4) ,-5) ) ,-7) ,4) ) +transpose(arpeggio(shuffle(transpose(arpeggio(transpose(X,-7) ) ,-5) ) ) ,7) ) ) ) +transpose(((transpose(((((arpeggio(transpose((transpose(echo(transpose((X+X) ,4) ,4,6) ,4) +transpose(echo(((transpose((((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,4) +transpose(transpose(((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) +(X+transpose(transpose(X,-7) ,12) ) ) +transpose(((X+X) +transpose(X,12) ) ,12) ) ,-5) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,4,6) ,12) ) ,4) ) +transpose(transpose((transpose((arpeggio((((arpeggio(X) +transpose(echo(step(X,12) ,4,6) ,7) ) +echo((X|X) ,4,6) ) |transpose((X+transpose(X,7) ) ,-7) ) ) +(step(X,12) +transpose(transpose(X,4) ,12) ) ) ,4) |arpeggio(echo(transpose((transpose((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) +transpose((X+X) ,-7) ) ,4) ,4,6) ) ) ,4) ,4) ) +transpose((((arpeggio(transpose(((transpose(shuffle(X) ,-7) +transpose(X,4) ) +transpose(((X+transpose((X|X) ,12) ) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,7) ) ,-5) ) |(((((X+transpose(step(X,12) ,12) ) +transpose(X,12) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(arpeggio((transpose(transpose(X,-7) ,-7) +transpose(transpose((X|X) ,4) ,12) ) ) ,-5) ,7) ) ) +transpose(transpose((((step(X,12) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) +((transpose((transpose(X,4) +(X+X) ) ,-5) +transpose((echo(transpose(X,-7) ,4,6) |arpeggio((shuffle(X) |X) ) ) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ) |echo((shuffle(transpose(X,-5) ) +(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose((step(X,12) +X) ,4) ) +transpose(shuffle(X) ,7) ) +(((X+X) +transpose(X,12) ) |transpose((X+transpose(X,7) ) ,4) ) ) ) ,4,6) ) ,-5) ,12) ) +transpose(transpose((((arpeggio(X) |step(X,12) ) +transpose((transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) |(((transpose(X,-5) |(X+X) ) +transpose(((X+transpose(transpose(X,4) ,7) ) +transpose(transpose(step(X,12) ,-5) ,7) ) ,4) ) +transpose(X,7) ) ) ,12) ) |(step(((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) +(transpose((X|X) ,4) |(((X|X) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(shuffle((X|X) ) ,7) ) ) ) ) ,-5) ,12) ) ,7) ) +transpose((((transpose((transpose(transpose(X,-5) ,4) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(transpose((((shuffle(X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) |((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ) ,4) ,7) ) ,7) ) ,4) +transpose(transpose((transpose((((transpose(X,-7) +transpose(X,-7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) ,-7) +transpose((transpose((transpose(shuffle((X|X) ) ,-5) |shuffle(transpose(echo(X,4,6) ,-7) ) ) ,-7) +transpose((step((X|X) ,12) |((X+transpose(X,12) ) |X) ) ,7) ) ,12) ) ,-5) ,4) ) +transpose(transpose(((transpose((X+echo(X,4,6) ) ,-5) +transpose(transpose((X+X) ,4) ,4) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,-5) ,7) ) |((((arpeggio((((X+transpose(X,12) ) +step(X,12) ) +transpose((transpose(X,-5) |(arpeggio(X) +transpose(arpeggio(X) ,12) ) ) ,7) ) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose(arpeggio(transpose(shuffle(transpose(X,-7) ) ,-5) ) ,-7) ,12) ) ) +transpose(transpose(arpeggio((shuffle(transpose(transpose(X,-5) ,4) ) |((echo(X,4,6) +(((arpeggio(X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) |X) ) +transpose(transpose((arpeggio(step(X,12) ) +transpose(((X+transpose(X,7) ) |transpose(X,-7) ) ,7) ) ,-7) ,7) ) ) ) ,4) ,4) ) +transpose(step((((X+X) |transpose(X,-5) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) ,12) ,7) ) +transpose(step(arpeggio((arpeggio(transpose(shuffle((X+transpose(X,12) ) ) ,-5) ) +(transpose(X,4) |(X|X) ) ) ) ,12) ,4) ) ) ,12) ) +transpose((((transpose(transpose(transpose(transpose((((((transpose(X,4) +transpose(transpose(X,-7) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(X,4) ) +transpose(step(transpose(transpose(X,-5) ,4) ,12) ,7) ) |transpose((transpose(X,-7) |X) ,4) ) ,-5) ,-5) ,-5) ,-7) |transpose(transpose(transpose(transpose((shuffle(transpose((transpose(X,-5) |(X+transpose(X,7) ) ) ,4) ) |(step(step((transpose(X,4) |transpose(X,4) ) ,12) ,12) +transpose(echo(transpose(((X+X) +transpose(transpose(X,-5) ,7) ) ,-5) ,4,6) ,12) ) ) ,4) ,4) ,-5) ,-7) ) +transpose(transpose(arpeggio(transpose(step(((step(((transpose(echo(echo(X,4,6) ,4,6) ,4) +transpose(arpeggio(step((transpose(transpose(X,-7) ,-5) +shuffle(transpose(X,4) ) ) ,12) ) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ,12) |transpose(X,-5) ) |transpose((echo(transpose(X,4) ,4,6) |((transpose(X,-7) +transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4) ) ,12) ,4) ) ,-5) ,4) ) +transpose(echo((transpose((((echo(X,4,6) +transpose(shuffle(X) ,12) ) +transpose(step(echo(X,4,6) ,12) ,4) ) +transpose(transpose((arpeggio(X) |(X+transpose(X,12) ) ) ,-7) ,7) ) ,-5) +((echo(((transpose(arpeggio(X) ,4) +transpose(step(X,12) ,12) ) +transpose((((X+transpose(X,12) ) +transpose(X,7) ) |((X+transpose(X,12) ) +transpose((X+X) ,7) ) ) ,12) ) ,4,6) +transpose((((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,-5) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(transpose(X,-5) ,-7) ) ,4) ) +transpose((transpose((X+X) ,-5) |(X+transpose(X,12) ) ) ,7) ) ,7) ) |((echo(transpose(X,-7) ,4,6) +(step((X|X) ,12) +transpose(transpose(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,-7) ,12) ) ) +transpose(transpose(transpose(step(X,12) ,4) ,-5) ,-5) ) ) ) ,4,6) ,7) ) ,12) ) ,-7) +transpose((((transpose(echo(transpose(step(transpose(arpeggio(transpose(transpose(X,-7) ,4) ) ,-7) ,12) ,-5) ,4,6) ,4) +((transpose(transpose(echo(transpose(X,-7) ,4,6) ,4) ,-5) +transpose(transpose(shuffle((arpeggio(X) +transpose(shuffle(transpose(X,4) ) ,7) ) ) ,4) ,4) ) +transpose((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(transpose((X+transpose((X|X) ,7) ) ,4) ,-7) ,12) ) +step((transpose(transpose(X,4) ,-7) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) ,12) ) ,7) ) ) |(transpose(((((X+transpose(X,7) ) +transpose((transpose(arpeggio(X) ,-7) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose((X|X) ,4) ,12) ) ,7) ) ,12) ) ,12) ) |transpose(transpose(((arpeggio(X) +transpose(transpose(echo(X,4,6) ,-5) ,12) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,-7) ,4) ) +transpose(transpose(((transpose(step(X,12) ,4) +transpose(shuffle(echo(X,4,6) ) ,12) ) |((X+X) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ) ,4) ,12) ) ,-5) +transpose(shuffle(shuffle(((((transpose(X,-5) |transpose((X|X) ,-5) ) +transpose((transpose((X+transpose(X,-7) ) ,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ,12) ) ,4) ) +transpose(arpeggio((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) ) ) ,7) ) ) |((step(transpose(step(((((step(X,12) +transpose(step(echo(X,4,6) ,12) ,7) ) +transpose(shuffle(X) ,12) ) +step(transpose(transpose(X,-5) ,-7) ,12) ) +transpose((X+X) ,-5) ) ,12) ,4) ,12) +transpose(arpeggio(shuffle(shuffle(echo(((((X+transpose(X,12) ) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) +transpose(step((X+transpose(X,12) ) ,12) ,4) ) +transpose(((X+transpose(transpose(X,4) ,12) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,7) ) ,4,6) ) ) ) ,12) ) +transpose(transpose((transpose((arpeggio(transpose(step(X,12) ,-7) ) |transpose(transpose(transpose(X,-5) ,4) ,4) ) ,-5) +transpose(transpose(((transpose(transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,4) ,-7) |(transpose(transpose(X,-5) ,4) +echo(transpose(step(X,12) ,4) ,4,6) ) ) +transpose(transpose(((shuffle(echo(transpose(X,-5) ,4,6) ) +transpose((transpose(X,-7) +((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ) ,12) ) +echo((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) ,4,6) ) ,-7) ,7) ) ,-5) ,4) ) ,4) ,7) ) ) ,4) ) +transpose(transpose(((transpose(shuffle(((transpose(((shuffle(X) +transpose(transpose(X,-5) ,7) ) |(transpose(((transpose(X,4) +transpose((X|X) ,4) ) +transpose(X,7) ) ,-7) +transpose(shuffle(((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ) ,4) +transpose(transpose(((((X+X) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) |transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) ,-5) ,7) ) +(((transpose(transpose(X,-5) ,4) +transpose(arpeggio(X) ,7) ) +transpose(transpose(((X|X) +transpose(X,-5) ) ,-7) ,4) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,7) ) ) ) ,4) |((((step(transpose((transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +(echo((X+transpose(X,7) ) ,4,6) +transpose((transpose(X,-7) +X) ,12) ) ) ,-7) +transpose(transpose(transpose(((transpose((X|X) ,-5) +transpose((X+transpose(transpose(X,-7) ,7) ) ,12) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,-5) ,-5) ,7) ) ,4) ,12) +transpose(((((echo(step(X,12) ,4,6) +(step(step(X,12) ,12) |X) ) |transpose((transpose(step(X,12) ,-5) +transpose((transpose(X,4) |transpose(X,-7) ) ,7) ) ,4) ) |(((X+X) +(step(X,12) +shuffle(X) ) ) +transpose(step((X+X) ,12) ,7) ) ) |echo(transpose((echo((X|(X+X) ) ,4,6) +transpose(((arpeggio((X|X) ) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) +((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ) ,7) ) ,4) ,4,6) ) ,12) ) +transpose((((transpose(step(((transpose(step(echo(X,4,6) ,12) ,-7) |(X+transpose((X+transpose(X,7) ) ,-5) ) ) +transpose((arpeggio(shuffle(X) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,7) ) ,12) ,-7) +transpose(transpose(transpose((transpose((X+transpose((X+X) ,7) ) ,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,-7) ,7) ) +transpose(((step(transpose(X,-7) ,12) +transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) |transpose(((X|X) |(X|X) ) ,-5) ) ,4) ) +transpose((transpose(arpeggio(((echo(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4,6) +transpose(arpeggio(echo((X|X) ,4,6) ) ,12) ) +transpose(arpeggio(((shuffle(X) +transpose((X+transpose(X,12) ) ,4) ) +X) ) ,7) ) ) ,-5) |echo(shuffle(transpose((((X+X) +transpose((shuffle(X) |transpose(transpose(X,-7) ,-5) ) ,4) ) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-7) ,7) ) ,-7) ) ,4,6) ) ,7) ) ,4) ) +transpose((transpose(echo(echo(transpose(((X+transpose(X,12) ) +transpose(shuffle(X) ,12) ) ,4) ,4,6) ,4,6) ,-5) |(((step(X,12) +transpose(transpose(X,4) ,-7) ) +((X+transpose(X,7) ) +(((X+X) +transpose(transpose(X,-7) ,12) ) +shuffle((X+transpose(X,7) ) ) ) ) ) +echo(((((echo(X,4,6) +transpose(X,12) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) +transpose(step(step((transpose(X,-5) +X) ,12) ,12) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ,4,6) ) ) ,7) ) +transpose(step((transpose(transpose(transpose(echo(echo(transpose(X,-7) ,4,6) ,4,6) ,-5) ,4) ,-5) +transpose(transpose(((transpose(transpose(X,4) ,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((X+X) |(X+transpose(X,12) ) ) ,12) ) ,-7) ,4) ) ,12) ,7) ) ) +transpose(step(transpose((((echo(echo(((transpose(transpose(X,4) ,-5) |(transpose(X,-7) |echo(X,4,6) ) ) |(transpose((X+transpose(X,7) ) ,4) |arpeggio(transpose(X,4) ) ) ) ,4,6) ,4,6) +echo(arpeggio(transpose(arpeggio((step(X,12) +transpose(X,-5) ) ) ,-5) ) ,4,6) ) +transpose(((transpose((X+transpose(X,7) ) ,-5) +(echo(X,4,6) +transpose(X,-7) ) ) +transpose(echo(X,4,6) ,7) ) ,12) ) +((transpose(transpose(transpose(transpose(X,4) ,-7) ,-5) ,4) +transpose(transpose((arpeggio(((arpeggio(transpose(X,-7) ) |transpose(X,-5) ) +transpose(echo(((X|X) +step(X,12) ) ,4,6) ,12) ) ) +transpose(echo((step(shuffle(X) ,12) +arpeggio(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ) ) ,4,6) ,12) ) ,-7) ,4) ) +transpose(transpose(step(transpose(step(X,12) ,-5) ,12) ,-7) ,7) ) ) ,-5) ,12) ,12) ) ,4) ,7) ) ,12) )
random seed used was 193134571

NOTE: Generated phrase was too large ( 5691 ) , it has been truncated at 5000 notes. EXPR = transpose(echo(transpose((((transpose(transpose(shuffle((transpose(arpeggio(X) ,-5) |transpose((X+(X|X) ) ,-5) ) ) ,-7) ,-7) +transpose(step(transpose(transpose((((transpose(((X+transpose(transpose(X,4) ,7) ) |(echo(transpose(X,4) ,4,6) |transpose((X+transpose(X,12) ) ,-5) ) ) ,-5) +transpose(echo(transpose(transpose(step(X,12) ,-5) ,-5) ,4,6) ,12) ) +(((((X+transpose(transpose(X,4) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(step(arpeggio(X) ,12) ,4) ) +transpose((((transpose(X,-7) +X) +transpose(transpose(X,4) ,-5) ) |transpose(transpose((X+X) ,4) ,4) ) ,7) ) +transpose(step((X+transpose(transpose((step(X,12) +(X+transpose(X,7) ) ) ,-7) ,7) ) ,12) ,12) ) ) +((((((transpose(X,-7) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(arpeggio(X) ,7) ) +((X+transpose(arpeggio((X|X) ) ,4) ) +transpose((X|transpose(X,-7) ) ,7) ) ) |transpose(X,4) ) +transpose(transpose(((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) |((transpose(X,4) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) ,4) ,7) ) |transpose(transpose((((X+transpose(X,12) ) |transpose(X,-5) ) +transpose((transpose(X,-7) +X) ,12) ) ,-7) ,4) ) ) ,4) ,4) ,12) ,7) ) +transpose(((transpose(echo((transpose(((X|X) +transpose(transpose((X+transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ,-5) ,7) ) ,-5) |(transpose(transpose(transpose((((transpose(X,-7) |(X|X) ) +transpose((X+(X+transpose(X,7) ) ) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ,7) ) ,-5) ,-7) ,-7) +transpose(((step(arpeggio(transpose(transpose(X,-5) ,-7) ) ,12) +transpose((transpose(arpeggio(transpose((X+X) ,-7) ) ,-7) +shuffle((((X+X) +step(X,12) ) |X) ) ) ,7) ) +transpose(transpose(step(step(X,12) ,12) ,-5) ,7) ) ,12) ) ) ,4,6) ,-7) +transpose(transpose((transpose(((shuffle(transpose((X|X) ,-5) ) +(transpose(X,-7) +(X+transpose((transpose(X,-7) |transpose(X,-5) ) ,7) ) ) ) +transpose((step((((X+transpose(X,12) ) |(X+transpose(X,7) ) ) +transpose(transpose(X,-5) ,12) ) ,12) |(((X|X) +transpose(transpose(X,-5) ,12) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,-7) ) ,4) +transpose(((step(transpose(X,-7) ,12) |transpose(shuffle(X) ,-5) ) |transpose(((transpose(X,4) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(X,-5) ,7) ) ,-7) ) ,7) ) ,-7) ,-5) ) |(step(((step(step((X+transpose(X,12) ) ,12) ,12) +transpose(((X+transpose(((transpose(X,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) |shuffle(shuffle(X) ) ) ,4) ) +transpose(((transpose((X|X) ,4) +transpose(X,4) ) |X) ,7) ) ,12) +transpose((echo((X+transpose(X,-5) ) ,4,6) +echo(echo(X,4,6) ,4,6) ) ,7) ) ) ,4) ) +transpose(echo(((arpeggio(arpeggio(((step((((((X+transpose(X,12) ) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) |X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,12) +transpose((((transpose(X,-7) |step(X,12) ) +transpose(((step(X,12) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) |((shuffle(transpose(X,-5) ) +arpeggio(X) ) +transpose((transpose(X,-5) |X) ,7) ) ) ,7) ) |(X|((X|X) +transpose(step(transpose(X,4) ,12) ,12) ) ) ) ) ) +transpose(echo(echo((transpose(shuffle(echo(transpose((X|X) ,-5) ,4,6) ) ,4) +transpose(((((shuffle(echo(transpose(X,-7) ,4,6) ) +transpose(transpose((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) +transpose((echo(X,4,6) |transpose((X+transpose(X,12) ) ,-7) ) ,12) ) ,4) ,4) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose((transpose(X,4) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ,12) ) ,4,6) ,4,6) ,4) ) +transpose((step(step(arpeggio(transpose(arpeggio(transpose(transpose(X,-5) ,-7) ) ,-5) ) ,12) ,12) +transpose(echo(((step(((transpose(X,-5) +transpose(((echo(X,4,6) +transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) |step(X,12) ) ,12) +transpose(echo(shuffle(echo(X,4,6) ) ,4,6) ,12) ) +transpose((((X+transpose(X,12) ) +transpose(transpose((X|X) ,4) ,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,-5) ) ,4,6) ,7) ) ,-7) ) ,4,6) ,7) ) ,4) ,4,6) ,-7)
random seed used was 0

NOTE: Generated phrase was too large ( 84090 ) , it has been truncated at 5000 notes. EXPR = transpose((transpose((transpose(transpose((arpeggio((X+transpose(X,12) ) ) +shuffle(((X+transpose(X,7) ) +transpose((X+X) ,7) ) ) ) ,-5) ,-7) +transpose(transpose(((transpose(echo(X,4,6) ,-7) +transpose((X|((X+X) |(X+transpose(X,12) ) ) ) ,4) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,-5) ,7) ) ,4) +((transpose((transpose(transpose((transpose(((transpose(transpose(((X+transpose(X,12) ) |transpose(X,4) ) ,-7) ,-7) +transpose(transpose((transpose((X+transpose(X,7) ) ,4) +transpose(((X+transpose(X,12) ) +X) ,7) ) ,4) ,7) ) |((step(X,12) +(X+transpose(X,7) ) ) +transpose(transpose(shuffle((X+transpose(X,7) ) ) ,4) ,7) ) ) ,-5) |(transpose(transpose(transpose(X,-5) ,-5) ,-5) +transpose(transpose(step((transpose(step(X,12) ,-5) +transpose(X,7) ) ,12) ,4) ,7) ) ) ,-5) ,4) +transpose((transpose(shuffle(step(X,12) ) ,-5) |arpeggio(transpose(((transpose(shuffle((X+X) ) ,-7) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose((transpose(X,-5) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ,12) ) ,7) ) ,4) ) ) ,7) ) ,-7) +transpose(echo((((transpose(((((transpose(X,-7) +transpose(X,12) ) +transpose(transpose((X+X) ,4) ,4) ) +transpose(X,7) ) |step(transpose((X+X) ,-5) ,12) ) ,-5) +transpose(transpose(transpose(transpose(transpose(X,-7) ,-7) ,4) ,4) ,7) ) |transpose((step(transpose(X,-7) ,12) +transpose(shuffle(transpose(transpose(X,4) ,-7) ) ,-5) ) ,4) ) +transpose((transpose(echo(shuffle(echo(step(transpose(X,-5) ,12) ,4,6) ) ,4,6) ,-5) +transpose(echo((step(((X|X) +transpose((X+transpose(X,7) ) ,7) ) ,12) +((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ) ,4,6) ,12) ) ,7) ) ,4,6) ,4) ) +transpose(((((((arpeggio(((transpose(X,4) +transpose(echo(step(X,12) ,4,6) ,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) +shuffle((arpeggio(X) |(X+transpose((X+transpose(X,12) ) ,7) ) ) ) ) +transpose(echo(echo(transpose((((X+transpose(X,12) ) +(X+transpose(X,7) ) ) +transpose(((X|X) |transpose(X,-5) ) ,7) ) ,-5) ,4,6) ,4,6) ,4) ) +transpose((shuffle(((shuffle(step(X,12) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) +transpose((((transpose(X,-5) |X) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ) ,7) ) |step(transpose(transpose(echo(echo((arpeggio(X) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ,4,6) ,4,6) ,-5) ,-5) ,12) ) +transpose(step(transpose(((((X|(X+X) ) +(transpose(transpose(X,-5) ,-5) +transpose(X,-5) ) ) +transpose(((((transpose((X|X) ,-7) |(X+transpose(X,12) ) ) +transpose(((X+echo(X,4,6) ) +transpose((X+X) ,7) ) ,4) ) +transpose((((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,7) ) +transpose(arpeggio((X|X) ) ,7) ) ,12) ) +((((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) |transpose(step(X,12) ,-5) ) +(((X+transpose(X,7) ) |X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,-7) ,12) ,7) ) |transpose(transpose(((((transpose(X,-7) +transpose(X,12) ) +transpose(echo(transpose(step(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ,12) ,-5) ,4,6) ,7) ) +transpose((shuffle((((X+X) +transpose(transpose(X,-7) ,12) ) +echo((X+transpose(X,12) ) ,4,6) ) ) +step(transpose(((X+X) +transpose(transpose(X,-5) ,7) ) ,4) ,12) ) ,4) ) +transpose(transpose(transpose((transpose(X,4) +(echo(X,4,6) +(arpeggio(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,4) ,-7) ,7) ) ,-7) ,4) ) ,7) ) ) ,-7)
random seed used was 0 EXPR = transpose(arpeggio(step(transpose(transpose(shuffle((((((transpose(X,-5) +X) +transpose(shuffle(transpose(transpose(X,4) ,4) ) ,7) ) |transpose((arpeggio((X+X) ) +transpose(transpose((X|X) ,4) ,7) ) ,-7) ) +transpose(((transpose((transpose(X,4) +transpose(transpose(X,4) ,7) ) ,-7) +((X+transpose((X|X) ,12) ) +transpose(echo(X,4,6) ,7) ) ) +transpose(echo(X,4,6) ,12) ) ,7) ) +transpose((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) |transpose(X,4) ) ) |transpose(((X+transpose(X,7) ) |(X+X) ) ,-5) ) +transpose(transpose((transpose(X,-7) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ) ,-7) ,12) ) ,12) ) ) ,-7) ,4) ,12) ) ,-5)
random seed used was 0


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