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 20 generations the expression "X" became this:
step(((((((transpose((echo(echo(transpose(X,4) ,4,6) ,4,6) +transpose(echo(transpose((((transpose(X,4) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,-5) ,4,6) ,12) ) ,4) +transpose((shuffle(step(shuffle(transpose(transpose(((shuffle(X) +transpose(shuffle(X) ,7) ) +transpose(echo(X,4,6) ,7) ) ,4) ,-5) ) ,12) ) +(transpose((echo(shuffle(X) ,4,6) +transpose(shuffle(transpose(X,-5) ) ,-5) ) ,4) +(echo(((X|(X+X) ) +(X|X) ) ,4,6) |transpose((shuffle((X+shuffle(X) ) ) +transpose(step((echo((X+transpose(X,7) ) ,4,6) |(transpose(X,-7) +transpose(X,7) ) ) ,12) ,7) ) ,4) ) ) ) ,7) ) |transpose((((shuffle(shuffle((transpose(transpose(((X+step(X,12) ) +transpose(X,7) ) ,-5) ,-7) +transpose((echo(echo(X,4,6) ,4,6) +echo(shuffle(transpose(X,4) ) ,4,6) ) ,12) ) ) ) +transpose(echo(shuffle(shuffle(step(transpose(shuffle((X+X) ) ,4) ,12) ) ) ,4,6) ,4) ) +transpose(echo(shuffle(transpose(X,-5) ) ,4,6) ,7) ) +(transpose(transpose(transpose(((X|X) |transpose(X,-7) ) ,-7) ,-7) ,-7) |((transpose(transpose((((shuffle(X) +transpose(X,7) ) |(X|X) ) |((transpose((X+transpose(X,7) ) ,4) +transpose(transpose(X,-5) ,4) ) +transpose(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose((X|X) ,7) ) ,7) ) ) ,-7) ,4) +transpose(((((((transpose(X,-7) +transpose(X,7) ) +((transpose((X+transpose(X,12) ) ,-7) +transpose(shuffle((X+X) ) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) +transpose(((transpose((transpose(X,-7) |transpose(X,4) ) ,-5) +transpose((X|X) ,4) ) +transpose(step(((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ,7) ) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) +transpose(shuffle(((X+X) +transpose((((X+transpose(X,12) ) +transpose(shuffle((X+X) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,7) ) ) ,12) ) ,4) ) +transpose((((transpose(X,-5) +transpose((X+X) ,7) ) +((echo(transpose(X,-7) ,4,6) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) |shuffle(transpose(X,4) ) ) ,7) ) ) ) ,-5) ) +transpose((shuffle(echo(((shuffle((shuffle((X+transpose(X,7) ) ) |transpose((transpose(X,4) +transpose(X,12) ) ,4) ) ) +transpose((echo(transpose(shuffle(X) ,-7) ,4,6) +(((X+X) +transpose(arpeggio(transpose(echo(arpeggio(X) ,4,6) ,-7) ) ,7) ) +(shuffle(X) +transpose(X,4) ) ) ) ,4) ) +transpose(transpose(shuffle((shuffle(X) |(step(transpose(X,-7) ,12) |X) ) ) ,4) ,7) ) ,4,6) ) +((transpose(transpose(shuffle(step(X,12) ) ,-5) ,-5) +(((((step((arpeggio(X) +transpose(X,-5) ) ,12) +transpose(shuffle(X) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) +(echo((arpeggio(X) +step((transpose(X,-5) +transpose(X,7) ) ,12) ) ,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,-5) ,12) ) ) ) |echo((transpose(transpose((((X+transpose((X+X) ,4) ) +transpose((X|X) ,7) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ,-7) ,4) +transpose(transpose(((X+transpose(((X+transpose(X,12) ) +X) ,4) ) +transpose(step(X,12) ,7) ) ,4) ,-7) ) ,4,6) ) ) ,-7) ) +transpose(((shuffle(step(step(((echo(transpose(X,4) ,4,6) |(((X|X) +transpose(arpeggio(X) ,12) ) +transpose(shuffle((X|X) ) ,12) ) ) +transpose(((X+transpose(X,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ,4) ) ,12) ,12) ) +transpose(transpose((transpose(((((arpeggio(X) +transpose(((arpeggio(((X+X) +X) ) +transpose(((X+transpose(shuffle(X) ,7) ) +transpose(transpose(X,4) ,4) ) ,4) ) +transpose((step((X+X) ,12) +arpeggio(X) ) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(shuffle(transpose(X,4) ) ,7) ) +transpose(((transpose(X,-5) |transpose(X,-5) ) +transpose(shuffle((((transpose(X,-7) +transpose((X|X) ,12) ) +transpose(shuffle(X) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ) ,12) ) ,12) ) ,-7) +transpose(shuffle(arpeggio((((((X|X) +transpose((transpose(X,-7) |(X+transpose(X,7) ) ) ,12) ) +transpose(transpose(transpose(transpose(X,4) ,-7) ,-7) ,7) ) +transpose(transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,-5) ,4) ) +transpose(shuffle(shuffle(((X+X) +transpose((X+transpose(X,7) ) ,12) ) ) ) ,7) ) ) ) ,12) ) ,4) ,12) ) +transpose((shuffle(transpose(transpose(((((shuffle((X+X) ) +transpose(((X|X) |((X+X) +X) ) ,4) ) +transpose(echo(shuffle(shuffle(X) ) ,4,6) ,7) ) +transpose(transpose(transpose((X|X) ,-7) ,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ,-7) ) +step(((((((X+(X|X) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) +transpose(X,-5) ) +transpose((((((transpose(transpose(((X|X) +transpose(X,12) ) ,-7) ,-7) +transpose((arpeggio(X) |X) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) +transpose(shuffle(((transpose(X,-7) +transpose(X,4) ) +transpose(transpose((X+X) ,4) ,7) ) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose((echo(transpose((X+transpose(arpeggio(X) ,12) ) ,-5) ,4,6) +transpose(transpose(((arpeggio(X) |echo(X,4,6) ) +transpose(X,12) ) ,4) ,7) ) ,7) ) ,4) ) +transpose((arpeggio((transpose(X,-5) +transpose(shuffle(X) ,7) ) ) |(((X|X) +transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose(shuffle((X+X) ) ,7) ) ) ,7) ) ,12) ) ,-5) ) ,12) ) +transpose(transpose(((step(transpose((transpose(shuffle(arpeggio(arpeggio(X) ) ) ,4) +transpose(arpeggio(transpose((shuffle(transpose(X,-7) ) |((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ) ,-5) ) ,7) ) ,-5) ,12) +transpose(echo(((arpeggio((transpose(transpose(X,-7) ,-7) +(((transpose(X,4) +X) +((arpeggio(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ) |echo(echo(X,4,6) ,4,6) ) ) ) +transpose(echo(shuffle(step(step(X,12) ,12) ) ,4,6) ,-7) ) |step(transpose(transpose(shuffle(arpeggio(X) ) ,4) ,-7) ,12) ) ,4,6) ,4) ) +transpose((((shuffle(echo(X,4,6) ) +transpose(X,4) ) |transpose(((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ,-7) ) +shuffle((transpose(shuffle(X) ,-7) +(((transpose(transpose(X,-5) ,4) +transpose((transpose(X,4) |X) ,12) ) +transpose(shuffle(X) ,4) ) +transpose((shuffle((X+X) ) |arpeggio(transpose(X,-5) ) ) ,7) ) ) ) ) ,7) ) ,-5) ,4) ) +transpose(((shuffle(transpose(shuffle(shuffle((transpose((X+transpose(X,12) ) ,4) +transpose(echo((X+X) ,4,6) ,12) ) ) ) ,4) ) +((((transpose(transpose((transpose((X+transpose(X,12) ) ,-7) |transpose((echo(X,4,6) |X) ,4) ) ,-5) ,-7) +transpose(transpose((shuffle(transpose(transpose(shuffle(X) ,-7) ,4) ) |transpose(echo(transpose(((transpose(X,4) +transpose(((X|X) +transpose(X,4) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,-5) ,4,6) ,-5) ) ,-7) ,4) ) +transpose((arpeggio(transpose((shuffle(X) +X) ,-7) ) |shuffle((step(X,12) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,-5) ) ) ) ,7) ) +transpose(arpeggio((((shuffle(arpeggio(transpose(arpeggio((transpose(X,-5) +X) ) ,-5) ) ) +transpose(shuffle((shuffle(transpose((transpose(X,-5) +X) ,4) ) +transpose((transpose(((X+transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) ,-7) +transpose(transpose((X|X) ,-7) ,12) ) ,12) ) ) ,4) ) +transpose(((shuffle(arpeggio(X) ) |transpose(X,-7) ) +X) ,7) ) |(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(shuffle(step(X,12) ) ,7) ) +transpose((shuffle((X|X) ) |transpose(step(transpose(X,-5) ,12) ,-7) ) ,12) ) ) ) ,12) ) +transpose(((arpeggio((transpose(transpose(X,4) ,-7) +transpose((transpose(step(X,12) ,4) +transpose(transpose(X,-5) ,7) ) ,12) ) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) +transpose(arpeggio((transpose(X,-7) +arpeggio(((transpose((X|X) ,-5) +shuffle(X) ) +transpose(transpose(X,-7) ,-7) ) ) ) ) ,12) ) ,-5) ) ) +(shuffle(transpose((echo(transpose((X|X) ,-7) ,4,6) |shuffle(echo((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ) ,4,6) ) ) ,-5) ) +((((transpose(shuffle(transpose(echo(X,4,6) ,-7) ) ,-5) +(((((X+transpose(X,4) ) +transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,7) ) +step(shuffle(X) ,12) ) +transpose(shuffle(X) ,4) ) +transpose((((echo(X,4,6) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) |(((X+transpose(X,7) ) +transpose((X+X) ,7) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ) +transpose(shuffle(((transpose(X,-7) +transpose((X+X) ,12) ) +transpose(transpose((X|X) ,-7) ,7) ) ) ,4) ) +transpose(shuffle(((transpose(X,4) +transpose(((X+transpose(X,12) ) +transpose((X|X) ,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,7) ) +transpose((echo((transpose((X+transpose(X,7) ) ,-5) +transpose((transpose(transpose(X,4) ,-7) +X) ,7) ) ,4,6) +transpose(shuffle(((shuffle(transpose(((X+X) +transpose(X,-5) ) ,-7) ) +transpose((arpeggio(shuffle(X) ) +transpose(((echo(X,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,4) ) +transpose((transpose(shuffle(X) ,-5) +transpose(X,12) ) ,7) ) ) ,7) ) ,12) ) ) ) ,7) ) ,12)
random seed used was 143011173 EXPR = arpeggio((shuffle(transpose(shuffle(transpose(transpose(transpose((shuffle(shuffle((transpose(transpose(X,4) ,4) +step(X,12) ) ) ) |transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ,-5) ) ,-5) ,-5) ,-7) ) ,4) ) +transpose(transpose((shuffle(echo(step(step(arpeggio((transpose(((((transpose(X,-5) +transpose(X,-7) ) +(transpose(X,4) +transpose(X,12) ) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) +(((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(shuffle(X) ,7) ) +step(((shuffle((X+transpose(X,7) ) ) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) |(shuffle((transpose((X|X) ,-7) |(((X|X) +transpose(X,4) ) +transpose(X,7) ) ) ) |((arpeggio(transpose(X,-5) ) +transpose(shuffle(transpose(X,4) ) ,7) ) +arpeggio((X|X) ) ) ) ) ) ,-7) +transpose(transpose((transpose(echo(step(shuffle(X) ,12) ,4,6) ,4) +(((shuffle(shuffle(transpose(step(X,12) ,-5) ) ) |step(echo(X,4,6) ,12) ) +transpose(step(step((transpose((X+transpose(X,7) ) ,4) +transpose(X,-5) ) ,12) ,12) ,4) ) +transpose((transpose(transpose(shuffle(X) ,-5) ,-7) |shuffle(((X+transpose(X,7) ) +transpose(X,12) ) ) ) ,7) ) ) ,-5) ,12) ) ) ,12) ,12) ,4,6) ) +transpose(((((echo(transpose(arpeggio(((X+transpose(shuffle(X) ,12) ) +(X|X) ) ) ,-7) ,4,6) +transpose((((step((echo(X,4,6) |((arpeggio(X) +transpose((X+X) ,4) ) +transpose(X,7) ) ) ,12) +transpose(arpeggio(shuffle(shuffle(X) ) ) ,7) ) |arpeggio(shuffle((X|X) ) ) ) +shuffle(((transpose(shuffle(transpose((transpose(X,-5) +transpose(X,7) ) ,4) ) ,-5) +transpose(echo(((((X|X) +(X+X) ) +transpose(shuffle(X) ,12) ) +((X+X) +transpose((X+step(X,12) ) ,7) ) ) ,4,6) ,4) ) +transpose(((step(X,12) +shuffle(X) ) +transpose(shuffle((X|X) ) ,7) ) ,7) ) ) ) ,12) ) +transpose(arpeggio(shuffle(((((X+transpose(X,12) ) |((X+transpose(X,12) ) |echo(X,4,6) ) ) +transpose(((X+transpose(X,12) ) |X) ,7) ) +transpose(shuffle((arpeggio(shuffle(X) ) +(X+transpose(X,7) ) ) ) ,12) ) ) ) ,12) ) +transpose(transpose((((transpose(X,-7) +(X|X) ) +transpose(X,-5) ) |(((X|shuffle(X) ) |arpeggio((step(X,12) +transpose(X,7) ) ) ) |transpose(echo(transpose(shuffle(X) ,-5) ,4,6) ,-5) ) ) ,4) ,-5) ) +shuffle(transpose(transpose((X+transpose((X+shuffle(X) ) ,7) ) ,-5) ,-7) ) ) ,4) ) ,-5) ,7) ) )
random seed used was 0 EXPR = ((echo(transpose(((shuffle(transpose((step((transpose(shuffle(echo(X,4,6) ) ,4) |(arpeggio(transpose(transpose(((arpeggio((X+X) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,12) ) |arpeggio((X+X) ) ) ,-5) ,4) ) |arpeggio(((transpose(shuffle(X) ,-7) +transpose((X+X) ,-7) ) +step((echo(X,4,6) +(X|X) ) ,12) ) ) ) ) ,12) |(transpose((((((transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose((shuffle((transpose(echo(X,4,6) ,4) |X) ) |(shuffle(X) +(X|X) ) ) ,12) ) +transpose(transpose(echo(((X+transpose(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ,4,6) ,-7) ,7) ) +transpose((transpose(X,-5) +(transpose(X,4) |X) ) ,-7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4) ) +transpose(step(((transpose(step(X,12) ,-5) +(((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose(transpose((transpose(X,-5) +transpose(step(X,12) ,12) ) ,4) ,-5) ) ,12) ,7) ) ,-5) +step(shuffle(shuffle(shuffle(shuffle(transpose(X,-5) ) ) ) ) ,12) ) ) ,4) ) +transpose((transpose(transpose((shuffle((arpeggio(transpose(X,-7) ) +((X+transpose(transpose(X,4) ,4) ) +transpose(((X|transpose(X,-5) ) |transpose(arpeggio(X) ,4) ) ,12) ) ) ) +(transpose(transpose(shuffle(((X+X) +transpose(X,7) ) ) ,-5) ,-7) |shuffle(step(((transpose(X,4) |(transpose(transpose(X,4) ,-7) +X) ) +transpose(shuffle((X+X) ) ,12) ) ,12) ) ) ) ,4) ,-5) |transpose(step(shuffle(transpose(step(transpose(transpose(echo(X,4,6) ,4) ,4) ,12) ,-5) ) ,12) ,-7) ) ,4) ) +transpose(((echo(((((transpose((transpose((transpose((X+X) ,-5) +transpose((X+transpose(X,7) ) ,12) ) ,-7) |transpose((X|(X+X) ) ,-5) ) ,4) +transpose(arpeggio(transpose((X+X) ,4) ) ,-5) ) +((shuffle((arpeggio(shuffle(shuffle(transpose(X,-5) ) ) ) +((transpose(step(X,12) ,4) +transpose(transpose(X,4) ,12) ) |X) ) ) +shuffle(shuffle((transpose(arpeggio(X) ,-5) |transpose(X,-5) ) ) ) ) |transpose(shuffle(transpose(transpose((transpose(X,4) +(X|X) ) ,-5) ,-7) ) ,-7) ) ) +transpose(shuffle(step((transpose(shuffle(transpose(X,-7) ) ,4) +((X|X) |(transpose(X,-5) +X) ) ) ,12) ) ,4) ) +transpose((transpose(arpeggio(shuffle(transpose(((X+transpose(X,7) ) +(X+(X+transpose(X,12) ) ) ) ,4) ) ) ,-7) +transpose(arpeggio(step(transpose(shuffle((X+X) ) ,-7) ,12) ) ,7) ) ,7) ) ,4,6) +transpose(shuffle(step((transpose(transpose((((X+transpose(X,7) ) +X) +transpose(((X|X) |X) ,7) ) ,-7) ,-5) +transpose(transpose((shuffle((X+transpose(X,12) ) ) +transpose(transpose(((X+transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,-7) ,12) ) ,-5) ,12) ) ,12) ) ,4) ) +transpose(shuffle((transpose(transpose(X,-7) ,-5) |(shuffle(transpose(shuffle(X) ,4) ) |transpose(transpose(((transpose(X,-7) +transpose((((X+X) +transpose(transpose(X,-5) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) +(echo(X,4,6) +shuffle(X) ) ) ,-5) ,4) ) ) ) ,7) ) ,7) ) ,-7) ,4,6) +transpose(((transpose((((((transpose(echo(transpose((X+X) ,-7) ,4,6) ,4) +transpose(transpose(transpose(shuffle(transpose(transpose(echo(X,4,6) ,-7) ,-7) ) ,-7) ,4) ,4) ) +transpose(shuffle(transpose(transpose(X,4) ,-7) ) ,7) ) +(((echo(transpose(X,-5) ,4,6) +transpose((X+transpose(X,12) ) ,4) ) +transpose(step(transpose(transpose(X,-5) ,-7) ,12) ,7) ) +transpose((transpose(echo(X,4,6) ,-7) +X) ,7) ) ) +transpose((((shuffle(shuffle(shuffle((((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((transpose(X,-7) +transpose(X,4) ) ,12) ) ) ) ) +((((((transpose((X|X) ,4) +transpose(shuffle(transpose((X+X) ,-7) ) ,12) ) +transpose((((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) ,-5) |shuffle(X) ) +transpose(shuffle((transpose(X,-5) |X) ) ,4) ) +transpose(transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(transpose((X|transpose(X,4) ) ,4) ,12) ) ,-7) ,7) ) ,7) ) +transpose((transpose((transpose(X,-5) |(X|X) ) ,-7) +transpose(transpose(transpose((X+X) ,-5) ,4) ,12) ) ,4) ) +transpose((shuffle(transpose(X,-5) ) +transpose((echo(((transpose(transpose(X,-7) ,-7) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) +echo(((step(echo((X+transpose(X,7) ) ,4,6) ,12) +transpose(((transpose(X,4) |shuffle(X) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,4) ) +transpose((transpose(X,-5) +transpose(arpeggio(X) ,12) ) ,7) ) ,4,6) ) ,12) ) ,7) ) |((echo(step(((shuffle(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,12) ,4,6) +transpose((transpose(shuffle(arpeggio(X) ) ,-7) +transpose(step(step(transpose(X,-5) ,12) ,12) ,7) ) ,4) ) +transpose(echo((X+transpose(transpose((X|X) ,-5) ,7) ) ,4,6) ,7) ) ) |(transpose((X+shuffle(X) ) ,-5) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-5) ,-5) ) ) ) +transpose(step((transpose((((((((X+transpose(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) ,7) ) |((X+(shuffle(X) +transpose(transpose(X,-5) ,12) ) ) +transpose(transpose(X,4) ,12) ) ) +transpose(arpeggio(transpose((X+transpose(X,12) ) ,-7) ) ,4) ) +transpose((((shuffle(X) |(transpose(X,-7) |(X+X) ) ) +transpose(transpose((X|X) ,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,-5) +transpose(transpose(shuffle(transpose(shuffle(arpeggio(X) ) ,4) ) ,4) ,7) ) ,12) ,4) ) +transpose(transpose(((transpose(transpose(step(arpeggio(X) ,12) ,-7) ,-5) +transpose(((transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,-5) +(echo(X,4,6) +echo((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ) ) |shuffle((shuffle(X) |shuffle(transpose(X,-5) ) ) ) ) ,7) ) |transpose(shuffle(shuffle(X) ) ,-7) ) ,-7) ,7) ) ,7) ) +transpose(transpose(transpose((transpose(transpose((shuffle(X) |transpose(X,4) ) ,-7) ,-5) +transpose(transpose(arpeggio((((transpose(transpose(X,-7) ,-7) +transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) +transpose(((((step(X,12) +transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) +transpose(((X|X) +(echo(transpose(X,-7) ,4,6) +(X+transpose(X,12) ) ) ) ,12) ) ,12) ) ) ,-5) ,7) ) ,-5) ,-5) ,12) ) ,-7) +transpose(transpose(transpose((echo((transpose(((echo((echo(arpeggio((X+X) ) ,4,6) |transpose((X+transpose(X,7) ) ,-7) ) ,4,6) +transpose(echo(arpeggio((shuffle(X) +transpose(X,12) ) ) ,4,6) ,4) ) +transpose(((step(transpose(X,-5) ,12) +(X+transpose(X,12) ) ) +transpose(arpeggio(X) ,12) ) ,7) ) ,-5) +transpose(((transpose(transpose(((arpeggio(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,-5) ,-5) |transpose(transpose(X,4) ,4) ) +shuffle(transpose(transpose(X,-7) ,-5) ) ) ,12) ) ,4,6) +transpose(((((transpose(shuffle((X+X) ) ,4) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,12) ) |shuffle(((transpose((X+transpose(echo((X+shuffle(X) ) ,4,6) ,12) ) ,4) +transpose(arpeggio((transpose(X,4) +(step(X,12) |((X+X) +X) ) ) ) ,4) ) +transpose((shuffle((transpose(transpose(X,4) ,4) +transpose(((X|X) +X) ,12) ) ) +(((arpeggio(transpose(X,4) ) +transpose(shuffle(X) ,7) ) +transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) ) ) +transpose((((((echo(((X+X) +transpose(X,7) ) ,4,6) +transpose(((X+transpose(shuffle(arpeggio(transpose(X,4) ) ) ,4) ) +transpose((transpose((X+transpose(X,7) ) ,-5) |(shuffle(X) +(X+transpose(X,7) ) ) ) ,7) ) ,7) ) |shuffle(arpeggio((X+transpose(X,7) ) ) ) ) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,7) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ,-5) ) |step(((((transpose(X,-5) |X) +transpose(((transpose((X+X) ,4) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ,-5) ) +transpose(((shuffle(X) |step(X,12) ) +transpose(transpose(transpose(X,4) ,-7) ,4) ) ,7) ) |transpose(shuffle((shuffle(X) +transpose((X+transpose(X,7) ) ,-7) ) ) ,-5) ) ,12) ) ,4) ) +transpose((transpose(echo(transpose(shuffle(transpose(X,-7) ) ,4) ,4,6) ,4) +transpose(((transpose(X,-7) +transpose(((shuffle(X) |(X+X) ) |(X|(X+X) ) ) ,7) ) +transpose(((X+transpose(transpose(X,-7) ,12) ) +arpeggio(X) ) ,-5) ) ,7) ) ,7) ) ,12) ) ,4) ,4) ,7) ) +transpose(((((echo((echo(((((transpose((X+transpose(X,12) ) ,-7) +transpose((X+transpose(X,12) ) ,12) ) |((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose(transpose((transpose(X,4) +transpose(transpose(step(X,12) ,-7) ,12) ) ,-7) ,4) ) +transpose((step(X,12) |transpose((X|X) ,4) ) ,7) ) ,4,6) |transpose((((shuffle(arpeggio(X) ) +X) +transpose(((X+transpose(X,12) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ,4) ) +transpose(transpose((((X+X) +(X+transpose((X+transpose(X,12) ) ,7) ) ) +transpose(shuffle(X) ,12) ) ,-5) ,7) ) ,4) ) ,4,6) |step(transpose(shuffle(echo(transpose((shuffle(X) |arpeggio(((X+transpose(X,12) ) +transpose(step(X,12) ,7) ) ) ) ,4) ,4,6) ) ,-7) ,12) ) +((transpose(((arpeggio(shuffle(X) ) +transpose(X,4) ) +transpose((((step(((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) +shuffle(step(X,12) ) ) ,7) ) ,-5) |((step(echo(X,4,6) ,12) +transpose(shuffle(transpose(X,4) ) ,12) ) +(transpose(((X+transpose((shuffle(X) |shuffle(X) ) ,4) ) +transpose((step(X,12) +shuffle(X) ) ,7) ) ,-7) +((transpose(X,-5) +transpose(echo(X,4,6) ,4) ) +transpose((transpose(X,-7) +transpose(transpose(X,4) ,12) ) ,7) ) ) ) ) +step((shuffle((arpeggio((transpose((X|X) ,4) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ) +transpose(X,-5) ) ) +transpose(shuffle((transpose(shuffle(((shuffle((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(shuffle(X) ,4) ) +transpose(((X+X) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ,7) ) ) ,4) +echo(arpeggio(shuffle(shuffle(X) ) ) ,4,6) ) ) ,7) ) ,12) ) ) +transpose((shuffle(step(shuffle((transpose(echo(X,4,6) ,4) +transpose(step((((X+X) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,12) ,7) ) ) ,12) ) +step(transpose((transpose(((echo(X,4,6) |transpose(X,4) ) +(X|(X+X) ) ) ,4) +transpose(((echo((transpose(X,-7) |transpose(X,4) ) ,4,6) +transpose((transpose(shuffle(X) ,-5) +arpeggio((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ) ) ,4) ) +transpose((((X+transpose(X,12) ) +shuffle(echo((X|transpose(X,-7) ) ,4,6) ) ) +(step(transpose(shuffle(X) ,-7) ,12) |transpose(arpeggio(transpose(X,-7) ) ,-7) ) ) ,7) ) ,7) ) ,-7) ,12) ) ,4) ) +transpose(((arpeggio(((transpose(X,-7) |(X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((echo(X,4,6) |transpose((X+transpose(X,7) ) ,4) ) ,7) ) ) +transpose((arpeggio(((((shuffle(X) +transpose(X,7) ) |X) |(transpose(X,4) +transpose(transpose(X,4) ,12) ) ) +transpose(((transpose(X,4) +transpose(transpose(X,4) ,4) ) +transpose(transpose(transpose((X+X) ,-7) ,-5) ,7) ) ,12) ) ) |(transpose(transpose(echo(((step(transpose(X,-5) ,12) +transpose((X+(shuffle(X) +transpose(shuffle(X) ,7) ) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ,4) ,4) |(transpose(arpeggio(X) ,4) |(echo(X,4,6) +transpose(X,-5) ) ) ) ) ,12) ) +transpose((transpose(echo((step(transpose(step(((X+transpose(X,7) ) |transpose((X+X) ,-5) ) ,12) ,4) ,12) +((shuffle(shuffle(transpose((echo(X,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ) +transpose(shuffle(echo((X+transpose(arpeggio(X) ,-7) ) ,4,6) ) ,4) ) +transpose(transpose(transpose(transpose(transpose(X,-5) ,-7) ,-7) ,-5) ,7) ) ) ,4,6) ,4) +step((echo(transpose(echo(transpose(X,-5) ,4,6) ,-7) ,4,6) +transpose((transpose((shuffle(X) +transpose(transpose(X,4) ,7) ) ,4) +(step(transpose(transpose((X+X) ,-7) ,-5) ,12) |(arpeggio(X) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ) ) ,-5) ) ,12) ) ,12) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(echo((((step((transpose(echo(shuffle((transpose((echo(X,4,6) +(X+transpose(X,12) ) ) ,-7) +transpose(shuffle(X) ,7) ) ) ,4,6) ,-5) +echo(transpose(step((((X+X) +transpose((X+(X+transpose(shuffle(X) ,12) ) ) ,-7) ) +transpose(((X+transpose(arpeggio(shuffle(X) ) ,7) ) |transpose((X+X) ,4) ) ,7) ) ,12) ,4) ,4,6) ) ,12) +transpose(shuffle((transpose(transpose((shuffle(echo(X,4,6) ) +transpose(X,7) ) ,4) ,-5) +transpose((transpose(transpose(arpeggio(((X|X) +(X+transpose(X,12) ) ) ) ,4) ,-5) |((step(transpose(transpose(step(X,12) ,4) ,-7) ,12) |transpose(((((X|X) +transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) |transpose(((X|X) |X) ,-7) ) ,-7) ) +transpose(transpose(arpeggio((X+X) ) ,-5) ,7) ) ) ,7) ) ) ,7) ) |arpeggio((transpose(transpose(transpose(transpose(X,-7) ,4) ,4) ,-5) |(echo(echo(((X|arpeggio(X) ) |(X|X) ) ,4,6) ,4,6) +transpose(transpose(X,-7) ,12) ) ) ) ) |echo(echo(transpose((transpose(transpose((shuffle(X) +X) ,4) ,4) |((transpose(shuffle(X) ,4) +transpose((shuffle((X|X) ) +((X+transpose(X,12) ) +transpose(X,-7) ) ) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ) ,4) ,4,6) ,4,6) ) ,4,6) ,-7) ,7) )
random seed used was 0

NOTE: Generated phrase was too large ( 5095 ) , it has been truncated at 5000 notes. EXPR = echo(transpose(arpeggio((((arpeggio((arpeggio(transpose((((((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) +transpose(transpose(((X+X) +transpose(X,12) ) ,-7) ,12) ) ,-5) ) +transpose((arpeggio(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((((shuffle(transpose(X,-7) ) +transpose(transpose(((X+X) +transpose((X|X) ,7) ) ,-7) ,12) ) +transpose(step(shuffle(echo(X,4,6) ) ,12) ,7) ) +transpose((transpose(transpose((transpose(shuffle(X) ,-5) +transpose((transpose(X,-5) +(X+X) ) ,7) ) ,-5) ,4) +echo(arpeggio(transpose(step(X,12) ,4) ) ,4,6) ) ,12) ) ,7) ) ,7) ) ) +transpose(transpose(shuffle(step(shuffle(transpose((X|echo(echo(X,4,6) ,4,6) ) ,-5) ) ,12) ) ,4) ,12) ) +transpose((((step(X,12) +X) +transpose(transpose(step(X,12) ,-7) ,12) ) +transpose(transpose(transpose(shuffle(shuffle(X) ) ,4) ,-7) ,12) ) ,7) ) +shuffle((arpeggio(shuffle(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-5) ) ) +transpose(((transpose(transpose((X+(X|X) ) ,4) ,-7) +transpose((step(shuffle((shuffle(X) |((X|X) +(transpose(X,4) +transpose(X,-5) ) ) ) ) ,12) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) ) ,12) ) ,12) ) +transpose(((shuffle(echo((shuffle(X) |((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) ) ,4,6) ) +transpose((transpose(transpose((shuffle(transpose(X,-7) ) +transpose(arpeggio(step((X|X) ,12) ) ,7) ) ,-5) ,-5) +step((arpeggio(shuffle(X) ) +transpose(((arpeggio(X) +transpose(transpose(transpose(X,-7) ,4) ,12) ) +(X+transpose((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) ,7) ) ) ,12) ) ,12) ) ,4) ) +transpose((((((transpose(X,-5) +transpose((transpose(X,4) |X) ,7) ) +transpose(transpose((X+X) ,-5) ,12) ) +(((X|X) +transpose(X,7) ) |transpose((X|X) ,4) ) ) +transpose(shuffle(arpeggio(arpeggio(X) ) ) ,7) ) |shuffle(transpose((shuffle((X+X) ) |transpose(shuffle(X) ,-5) ) ,-5) ) ) ,7) ) ,12) ) ,12) ) ) ) ) ,-5) ,4,6)
random seed used was 0


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