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:
((transpose((((step(shuffle((arpeggio((transpose(transpose(((transpose(arpeggio(transpose(X,-7) ) ,-7) +shuffle((X|X) ) ) +transpose((arpeggio(transpose(X,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ,-7) ) ,-5) ,-7) |transpose(((transpose((X+transpose(X,12) ) ,4) |step(((X+transpose(X,7) ) +arpeggio(step(X,12) ) ) ,12) ) +transpose((X+((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) ,7) ) ,-7) ) ) +transpose(transpose(step((transpose(((((arpeggio(X) +transpose((transpose(X,-5) |X) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) +transpose(shuffle(shuffle(X) ) ,7) ) +transpose((((X|X) +(X|X) ) |transpose((transpose(X,-7) |(X+transpose(X,12) ) ) ,4) ) ,12) ) ,-5) |((transpose(((transpose(X,-7) +transpose((X|X) ,4) ) +transpose(X,7) ) ,-7) |X) +transpose((X+transpose((X+X) ,12) ) ,-5) ) ) ,12) ,-7) ,12) ) ) ,12) +transpose(arpeggio((transpose(((((transpose((transpose((((X+transpose((X|X) ,12) ) |echo(X,4,6) ) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) |transpose(shuffle(X) ,-7) ) ,7) ) ,-7) |(step(X,12) |(transpose(transpose(X,-5) ,4) +transpose((X|shuffle(X) ) ,12) ) ) ) ,4) +((transpose((((X+X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,-7) +transpose(transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) +transpose(arpeggio((((X+transpose(X,7) ) |(X|(X+X) ) ) |(((X+transpose(X,12) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ) ) ,12) ) ) |transpose(((echo(transpose(step(X,12) ,-5) ,4,6) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) +transpose((arpeggio((arpeggio((X+X) ) +transpose((transpose(X,-7) +(transpose(X,4) |X) ) ,7) ) ) +transpose((((arpeggio(shuffle(X) ) +transpose((transpose(X,-5) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose((X+X) ,7) ) +echo((transpose(X,-5) +transpose(X,-7) ) ,4,6) ) ,12) ) ,7) ) ,4) ) +transpose(transpose(((transpose(((((X+transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) +transpose((echo(X,4,6) +transpose(X,12) ) ,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,4) |(transpose((X+transpose(X,12) ) ,-7) +transpose((transpose(X,4) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,12) ) ) |(((transpose((X|X) ,4) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) +transpose(X,-5) ) ) ,-5) ,12) ) +transpose(((arpeggio(((((step(arpeggio(echo(X,4,6) ) ,12) +transpose(echo(X,4,6) ,12) ) +((X+X) +transpose(transpose(X,4) ,12) ) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) ) +transpose((transpose(X,4) +transpose(echo(arpeggio(X) ,4,6) ,12) ) ,4) ) ) +transpose((transpose((echo(X,4,6) +transpose(shuffle((X|X) ) ,12) ) ,-7) +(((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) +transpose((transpose(X,-7) +transpose(X,-7) ) ,-7) ) +transpose(((echo(X,4,6) +transpose((X+X) ,12) ) |(X+X) ) ,12) ) ) ,4) ) +transpose((transpose((transpose(((transpose(X,4) +X) +transpose(transpose(X,-5) ,12) ) ,4) +transpose(step(shuffle(arpeggio(transpose(X,-5) ) ) ,12) ,12) ) ,-5) +echo(transpose(transpose(((shuffle((X+transpose(arpeggio(X) ,12) ) ) |(arpeggio(X) +transpose(transpose(X,-5) ,7) ) ) +transpose(transpose((X+(X|X) ) ,-5) ,7) ) ,4) ,-5) ,4,6) ) ,7) ) ,12) ) ,-5) +transpose(((((((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ,-7) +transpose(X,-5) ) +transpose((transpose((X+X) ,4) +X) ,4) ) +transpose(((X|X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ,12) ) ,7) ) |arpeggio(transpose(((X+X) +transpose((X|X) ,7) ) ,-7) ) ) +transpose(step(transpose(step((X+transpose(X,12) ) ,12) ,-7) ,12) ,12) ) +step(transpose(shuffle((echo(X,4,6) +transpose(X,12) ) ) ,-7) ,12) ) ,12) ) ) ,4) ) +transpose(step(transpose(((shuffle((shuffle(transpose((transpose((transpose((X+X) ,-7) +transpose(echo(transpose((X+transpose(X,12) ) ,4) ,4,6) ,7) ) ,-7) |((step(shuffle(X) ,12) +transpose((X|X) ,-7) ) |step((transpose(X,4) |transpose(X,4) ) ,12) ) ) ,-5) ) +shuffle(arpeggio((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ) ) +transpose(step(shuffle((echo(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +step(X,12) ) ,-5) ,4,6) +(transpose(transpose(transpose(X,4) ,4) ,4) +arpeggio(echo(transpose((X+X) ,4) ,4,6) ) ) ) ) ,12) ,4) ) +transpose(((arpeggio(step(transpose(((step((X|X) ,12) |transpose((transpose(X,-5) +X) ,-5) ) +transpose(echo(transpose(((X|X) |arpeggio(X) ) ,4) ,4,6) ,-5) ) ,-5) ,12) ) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose((transpose((transpose((shuffle(transpose(X,4) ) +(((X+transpose(X,12) ) |step(X,12) ) +transpose(transpose(X,4) ,-7) ) ) ,-7) |((transpose((transpose(transpose((X+transpose(X,7) ) ,-5) ,4) +transpose(shuffle(arpeggio(X) ) ,12) ) ,4) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose(step(((step(X,12) +transpose((X+transpose(X,-7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ,7) ) ) ,-7) +transpose(((((step((X+X) ,12) +(X+transpose(X,7) ) ) |(shuffle(step(transpose(X,4) ,12) ) +transpose(step(transpose(((echo(X,4,6) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ,-5) ,12) ,7) ) ) |(((X+X) +transpose(arpeggio(X) ,4) ) +transpose((X|(X+X) ) ,7) ) ) +transpose(echo((step(transpose(X,-7) ,12) +transpose((((X+X) +transpose((((X+X) +transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,4) ) ,7) ) ,12) ) ,7) ) ,4) ,12) ,7) ) +((((echo(transpose((((X+transpose(X,-5) ) +((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) ,-5) ,12) ) ,-7) ,4,6) |transpose((transpose(arpeggio(transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ) ,4) +transpose(transpose((transpose(transpose(X,-5) ,-7) |(step(transpose((transpose(X,4) +transpose(X,7) ) ,-5) ,12) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ) ,-5) ,12) ) ,-5) ) +transpose((step(transpose(step(echo(echo(((echo(arpeggio(X) ,4,6) |(X+transpose(X,7) ) ) +transpose((X+X) ,-7) ) ,4,6) ,4,6) ,12) ,4) ,12) +(echo(transpose((transpose(((X+transpose(X,12) ) +X) ,-7) |((echo((X+X) ,4,6) +transpose(X,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) ) ,-7) ,4,6) +transpose(transpose(((transpose((X+transpose(X,12) ) ,-5) +transpose(step((X+transpose(X,12) ) ,12) ,12) ) +((transpose(transpose(transpose(X,4) ,-7) ,-7) |((transpose(X,4) +echo((X|X) ,4,6) ) +transpose(shuffle(transpose(transpose(X,4) ,-7) ) ,7) ) ) |(step((X+X) ,12) |((X+X) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) ) ) ) ,4) ,12) ) ) ,4) ) +((step(transpose(transpose(echo((X|X) ,4,6) ,4) ,-7) ,12) +(step((((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,4) ,4) ,12) ) ,12) +transpose(transpose(transpose(transpose(transpose(step(X,12) ,-5) ,-5) ,-5) ,-7) ,7) ) ) +transpose(step(((((((shuffle(echo(X,4,6) ) +(shuffle(X) +transpose(X,12) ) ) +transpose(shuffle(X) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(((X+X) |transpose(X,-7) ) ,-7) ,4) ) +transpose((echo((X|X) ,4,6) |X) ,7) ) +transpose((((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +(echo(X,4,6) +transpose(X,4) ) ) ,4) ) ,12) ,-7) ) ) |((transpose((transpose(arpeggio(((((transpose(X,-5) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ) ,-5) +transpose((((step(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ,12) +transpose(((shuffle(X) +(X|X) ) +transpose(((transpose(X,-7) |(X+X) ) +transpose(((X+X) +transpose(transpose(X,-5) ,7) ) ,12) ) ,7) ) ,4) ) +transpose(shuffle(step((X+transpose(X,-7) ) ,12) ) ,7) ) +transpose((transpose((arpeggio((X+transpose(X,7) ) ) +transpose(X,12) ) ,-5) +echo(echo((X+X) ,4,6) ,4,6) ) ,12) ) ,7) ) ,-7) +(transpose(transpose(((transpose((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) +(((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,7) ) ) ,-7) |transpose((transpose((X+transpose(X,12) ) ,-5) +(((X+transpose(X,7) ) +transpose(X,12) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) ) +(((X|X) +(shuffle(X) +X) ) +((((X|X) +transpose(transpose(X,-5) ,12) ) +transpose((transpose(transpose(X,4) ,-7) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) ,4) ) +transpose(((X|arpeggio(X) ) |transpose(arpeggio(X) ,4) ) ,7) ) ) ) ,-7) ,-7) |(step(((arpeggio((echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) +transpose((((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) +transpose(step(transpose(X,-5) ,12) ,4) ) ,-7) ) ) +transpose(((((echo(X,4,6) +((X+X) +transpose(transpose(X,-5) ,12) ) ) +transpose(transpose(shuffle((X|X) ) ,4) ,-5) ) |transpose(transpose(X,-5) ,4) ) |((transpose(transpose((transpose(shuffle(X) ,-7) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ,4) ,4) +transpose(arpeggio(shuffle(transpose(transpose(transpose(X,-5) ,4) ,-7) ) ) ,4) ) +transpose(step(((X+transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,12) ,7) ) ) ,4) ) +transpose(transpose(transpose((shuffle(echo(X,4,6) ) +transpose((((X+transpose(X,12) ) |((X|X) |X) ) |(((step(X,12) |echo(X,4,6) ) |transpose(X,-7) ) +transpose(transpose(X,4) ,4) ) ) ,12) ) ,-7) ,4) ,7) ) ,12) |transpose(transpose(arpeggio(transpose(transpose(((X+X) |transpose(X,4) ) ,4) ,-7) ) ,4) ,-7) ) ) ) +transpose(step((((transpose(((((transpose((((echo(transpose(X,4) ,4,6) +echo(transpose(X,4) ,4,6) ) +((X+transpose((X|X) ,7) ) |transpose((X+transpose(X,7) ) ,-7) ) ) +transpose(transpose((transpose(((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ,-7) |(transpose(X,-5) |X) ) ,-5) ,7) ) ,4) +transpose(transpose((((X|shuffle((X+transpose(X,7) ) ) ) +(X+transpose(X,12) ) ) |step(X,12) ) ,-5) ,4) ) +transpose(((arpeggio(X) |X) |((transpose(X,4) |(X+X) ) +transpose(((X|X) |(X+transpose(X,7) ) ) ,7) ) ) ,7) ) +transpose(transpose(((transpose((arpeggio(X) |(X|X) ) ,-5) +transpose((transpose(transpose(X,-5) ,-7) +step(echo(X,4,6) ,12) ) ,12) ) +(((transpose(transpose((X|X) ,-5) ,4) +transpose(transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose((X|echo(X,4,6) ) ,7) ) |((transpose(transpose(X,-5) ,4) +X) +transpose(X,4) ) ) ) ,-5) ,4) ) +transpose((((transpose(transpose((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,-5) ,4) +((echo(X,4,6) |((X+transpose(X,12) ) +(transpose(X,4) +(X|X) ) ) ) +((((arpeggio(X) +X) +transpose(transpose(X,-5) ,12) ) +transpose(echo((transpose(X,4) +(transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,4) ) +transpose(transpose(((X+X) +transpose(((X+X) +(X+transpose(X,7) ) ) ,7) ) ,4) ,7) ) ) ) +((echo((((X+transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) |transpose((transpose(X,4) +transpose(X,7) ) ,4) ) ,4,6) +transpose(((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(step((step(X,12) +transpose(arpeggio(X) ,12) ) ,12) ,-5) ,7) ) +transpose(shuffle(transpose(((X|X) +transpose(transpose(X,4) ,7) ) ,-5) ) ,4) ) ,4) ) +transpose(step((echo(step(X,12) ,4,6) |(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose(transpose((X+X) ,-5) ,12) ) ) ,12) ,7) ) ) |transpose((arpeggio(transpose(transpose(X,4) ,4) ) +transpose(transpose(arpeggio((shuffle(X) +X) ) ,4) ,12) ) ,4) ) ,7) ) ,-7) +transpose(step(echo(transpose(transpose((step(arpeggio(arpeggio(X) ) ,12) +step((X+transpose(arpeggio(X) ,12) ) ,12) ) ,-5) ,4) ,4,6) ,12) ,4) ) +transpose(transpose(((transpose(X,-5) +((arpeggio(X) |(X|X) ) |(X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) +(transpose((X|X) ,-7) |(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(((X+transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ) ) ,-5) ,7) ) +transpose(arpeggio(step(transpose(((shuffle(step(step(transpose(X,4) ,12) ,12) ) +((transpose(((arpeggio(X) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,-7) +transpose(transpose(shuffle(((transpose((X+X) ,-7) +transpose((X|shuffle(X) ) ,4) ) +transpose(((X+X) |(X|X) ) ,7) ) ) ,4) ,4) ) +transpose(((X+X) +transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,7) ) ) +transpose(echo((transpose((((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose((X+(X+transpose(X,7) ) ) ,7) ) +(X+transpose(X,12) ) ) ,-7) +transpose(step((step(X,12) +transpose(arpeggio((X+transpose(X,7) ) ) ,12) ) ,12) ,12) ) ,4,6) ,12) ) ,4) ,12) ) ,12) ) ,12) ,12) ) ) ) ,-7) +transpose(transpose(transpose((transpose(step((shuffle(((transpose((X+(X+transpose(X,12) ) ) ,-7) +transpose((transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) |X) ,4) ) +transpose((X|transpose(X,-5) ) ,7) ) ) |(transpose(transpose(X,-7) ,4) +transpose((transpose(transpose((transpose(X,4) +transpose(transpose(transpose(X,4) ,4) ,12) ) ,4) ,4) +transpose(arpeggio((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) ) ,7) ) ,7) ) ) ,12) ,-5) +((transpose((transpose(arpeggio(((shuffle((X+transpose(X,12) ) ) |(X+transpose((X+X) ,7) ) ) |((step(X,12) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ) ) ,4) |((echo(((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) +echo(transpose(X,4) ,4,6) ) +step(transpose(X,-5) ,12) ) ) ,-7) +transpose((arpeggio(transpose(shuffle(X) ,-7) ) +transpose(step(arpeggio(step(X,12) ) ,12) ,12) ) ,7) ) +transpose(step((((X|X) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,12) ,4) ) ) ,-7) ,4) ,-5) ) |(echo((arpeggio(((transpose(((transpose(transpose(transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,4) ) ,4) +transpose(((X+X) +(X+X) ) ,7) ) ,-7) ,-7) ,-7) +transpose((((shuffle((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(step(X,12) ,4) ,7) ) ) +transpose(step(transpose(X,-5) ,12) ,4) ) +transpose(step(echo(shuffle(X) ,4,6) ,12) ,7) ) +((((transpose(X,-5) |arpeggio(transpose(X,-5) ) ) |step(echo(shuffle(X) ,4,6) ,12) ) +transpose((echo((X+X) ,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,-5) ) ,4) ) +transpose(((((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((X+X) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,7) ) ) ,12) ) |echo(transpose(((((((X+X) +transpose(X,4) ) +transpose(transpose((X|X) ,-5) ,7) ) +echo(transpose(transpose(X,-5) ,-5) ,4,6) ) +transpose(echo(((shuffle((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ) +transpose(transpose(((transpose(X,-5) |(X+transpose(X,7) ) ) |echo(X,4,6) ) ,-5) ,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(transpose(X,-7) ,7) ) ,7) ) ,4,6) ,4) ) +transpose((transpose(shuffle(X) ,4) +(((echo(X,4,6) +transpose(X,12) ) +transpose(((X+transpose(X,7) ) +transpose(((transpose(X,-5) +arpeggio(X) ) +arpeggio(transpose(X,-7) ) ) ,7) ) ,4) ) +transpose(((transpose((X+transpose(X,12) ) ,-5) |step((X|X) ,12) ) |(step(shuffle(X) ,12) +transpose(transpose(X,4) ,4) ) ) ,7) ) ) ,7) ) ,4) ,4,6) ) ,4) |transpose((transpose(step(transpose(shuffle(X) ,-5) ,12) ,4) |((((((X|X) +transpose(X,4) ) +transpose((transpose(X,-5) +((X+transpose(X,12) ) +transpose(X,12) ) ) ,7) ) +(shuffle((X+X) ) |(X|X) ) ) +transpose(((step(X,12) +((X+transpose(X,12) ) |(X+transpose(X,7) ) ) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ,7) ) +((echo(arpeggio(arpeggio(X) ) ,4,6) +transpose(shuffle((shuffle(X) +(X+transpose(X,7) ) ) ) ,7) ) |transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4,6) ,-5) ) ) ) ,-7) ) +(transpose(((transpose(((X+transpose(X,12) ) +transpose(step(transpose(X,4) ,12) ,7) ) ,-5) +(transpose(transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,4) ,4) |echo((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,4,6) ) ) |(transpose((((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ,4) +transpose(((transpose(arpeggio(step(X,12) ) ,-7) |(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) ,-5) |arpeggio(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) ) ) +transpose(((step(transpose((X+transpose(X,12) ) ,4) ,12) +((X|transpose(X,-5) ) +transpose(X,7) ) ) +transpose(((X+X) +transpose(((X+transpose(X,12) ) |X) ,7) ) ,7) ) ,12) ) ,7) ) ) ,-7) +(transpose(transpose(echo(transpose(transpose((X+X) ,-7) ,-5) ,4,6) ,-5) ,-5) +transpose(transpose((transpose(((X|X) |transpose(transpose(X,-7) ,-7) ) ,4) +transpose(echo(((transpose(X,-7) +X) +transpose(X,7) ) ,4,6) ,12) ) ,4) ,7) ) ) ) ) |((((((echo(transpose((arpeggio(echo(step(((X+transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ,4,6) ) +transpose(shuffle(transpose(arpeggio(transpose(step(X,12) ,-5) ) ,-7) ) ,-7) ) ,-5) ,4,6) +transpose((echo(transpose(transpose((transpose(((X+transpose(X,12) ) |arpeggio(X) ) ,4) +((((X+transpose(X,7) ) |X) |shuffle(transpose(X,4) ) ) |((transpose(X,-5) +(X+X) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ) ) ,-5) ,-5) ,4,6) +(((transpose(arpeggio((transpose(X,-5) |(X|X) ) ) ,4) +transpose(step(transpose(transpose(transpose(transpose(X,4) ,-7) ,-5) ,-5) ,12) ,4) ) +transpose(step(shuffle((X|X) ) ,12) ,7) ) +transpose(transpose((((echo((transpose(arpeggio(arpeggio(X) ) ,4) |transpose(shuffle(X) ,4) ) ,4,6) +transpose(transpose((transpose((X+transpose(X,12) ) ,4) |((X+X) +transpose(transpose(X,4) ,12) ) ) ,4) ,12) ) +transpose(((transpose(((X+X) +X) ,-5) +transpose((((X+X) +transpose(X,7) ) +transpose(X,-5) ) ,4) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ,7) ) ,4) ) +transpose(transpose((arpeggio(transpose(X,4) ) +(transpose((X+transpose(X,12) ) ,-5) +transpose(X,4) ) ) ,-5) ,7) ) ,4) ,12) ) ) ,4) ) +transpose(((((transpose(shuffle(step(transpose((transpose(X,4) +transpose((X|X) ,7) ) ,-7) ,12) ) ,4) +transpose(((transpose((((X+transpose(X,7) ) +(X+X) ) +transpose(echo(transpose((X+X) ,4) ,4,6) ,7) ) ,-7) |transpose(transpose((X|X) ,4) ,4) ) +transpose(transpose((shuffle(X) |step(X,12) ) ,-5) ,12) ) ,4) ) +transpose(transpose(((transpose(transpose(X,-7) ,-5) +step(echo((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ,12) ) +transpose(arpeggio((((step((X|X) ,12) +(shuffle(X) +transpose(X,12) ) ) +transpose(transpose(echo(echo(X,4,6) ,4,6) ,-5) ,4) ) +transpose(((X+X) +transpose(X,7) ) ,7) ) ) ,12) ) ,-7) ,7) ) +((transpose(step((((transpose(X,-5) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(echo((X|X) ,4,6) ,7) ) |echo(transpose((X+X) ,4) ,4,6) ) ,12) ,-7) +transpose(echo(transpose(transpose(echo(transpose(transpose(X,-7) ,-7) ,4,6) ,-5) ,-7) ,4,6) ,12) ) +transpose(transpose((transpose(transpose(X,-7) ,-5) +(transpose(arpeggio(X) ,-7) +transpose(transpose(X,4) ,12) ) ) ,-7) ,7) ) ) +transpose((((transpose((((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((echo(X,4,6) |(((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ) ,7) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) +transpose(shuffle((X+transpose(arpeggio(X) ,12) ) ) ,4) ) ,-5) +transpose(echo((step(transpose(transpose((echo((X+transpose(X,12) ) ,4,6) +transpose((X|X) ,12) ) ,4) ,-7) ,12) +transpose(transpose((echo((X+X) ,4,6) +transpose(step((((X+X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ,12) ) ,-7) ,12) ) ,4,6) ,12) ) +shuffle(((((transpose(X,-7) +transpose(X,-5) ) +transpose(echo(((X+X) +transpose(((transpose(X,-7) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,4) ) +transpose(((transpose(X,4) +transpose(transpose(((X|X) +transpose(echo(X,4,6) ,12) ) ,-7) ,7) ) |step(X,12) ) ,7) ) +transpose(arpeggio(transpose(transpose((transpose((X+(X+transpose(X,12) ) ) ,4) +transpose(((X|X) +transpose((echo(X,4,6) |transpose(X,-5) ) ,7) ) ,12) ) ,-5) ,4) ) ,7) ) ) ) +(step(step((echo(transpose(echo(X,4,6) ,-5) ,4,6) +transpose(X,7) ) ,12) ,12) |((transpose((((X+X) |transpose((step(transpose(X,-5) ,12) |transpose(X,4) ) ,-5) ) |shuffle(transpose(step(transpose(X,-5) ,12) ,4) ) ) ,4) +transpose(arpeggio(((((echo(X,4,6) +transpose((transpose(X,-7) +transpose(X,12) ) ,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) +X) +(((X|X) +transpose(((X+transpose(X,7) ) +echo(X,4,6) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ) ) ,4) ) +transpose(transpose((((step(X,12) +transpose(X,-7) ) |transpose(X,-7) ) |(arpeggio(X) |shuffle(X) ) ) ,4) ,7) ) ) ) ,12) ) ,7) ) +transpose(step(((((((X+X) |transpose(step(X,12) ,4) ) |shuffle(echo(echo(echo(X,4,6) ,4,6) ,4,6) ) ) +transpose(echo(((transpose(((arpeggio(transpose(X,4) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,-7) +transpose(transpose(transpose((X+X) ,-7) ,4) ,4) ) +transpose((transpose(X,-7) |transpose(transpose(transpose(X,-7) ,-5) ,-5) ) ,7) ) ,4,6) ,12) ) |transpose(transpose(X,4) ,-5) ) +transpose(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +(arpeggio(transpose(X,4) ) +transpose(X,4) ) ) +transpose(transpose(step(X,12) ,-5) ,12) ) +transpose(transpose((((X+transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) +transpose(transpose(arpeggio(X) ,4) ,4) ) ,4) ,7) ) ,4) ,12) ) ,12) ,4) ) +transpose(shuffle(arpeggio(((((transpose((transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,-7) +shuffle(((X+transpose(X,12) ) +(X+transpose(X,12) ) ) ) ) ,-7) |((((X+transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(echo(echo((X+X) ,4,6) ,4,6) ,7) ) ) |step(arpeggio(transpose(transpose(((X+X) +transpose(X,12) ) ,-5) ,4) ) ,12) ) +echo(((arpeggio(((X+X) +X) ) |((transpose((X|X) ,4) |shuffle(X) ) +transpose(echo(((step(transpose(X,4) ,12) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,4,6) ,7) ) ) +(transpose(((echo((X+transpose(X,7) ) ,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) +(transpose((X+transpose(X,7) ) ,-7) |((transpose(X,-5) |arpeggio(X) ) |((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+X) ,7) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) ) ) ) ) ,4,6) ) +(((transpose((transpose((X|X) ,-7) +(transpose(echo(transpose(X,-7) ,4,6) ,-5) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ) ,-5) +transpose(shuffle(transpose((X+transpose(X,7) ) ,-5) ) ,12) ) +transpose(step(shuffle(transpose(transpose(X,-5) ,-7) ) ,12) ,12) ) +transpose(echo(((transpose(transpose((transpose(X,4) |(X|X) ) ,-5) ,-5) +shuffle(arpeggio(echo(step(X,12) ,4,6) ) ) ) +transpose(((((transpose(X,-5) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose((echo(shuffle(X) ,4,6) +transpose(transpose(X,-7) ,7) ) ,7) ) +(transpose((X+transpose(transpose(X,-7) ,12) ) ,4) +transpose(transpose(X,-5) ,4) ) ) +transpose((((transpose((transpose(X,-5) |transpose((X+transpose(X,12) ) ,4) ) ,4) |transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose(transpose((transpose(X,-5) +transpose((X|X) ,-7) ) ,-5) ,4) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,7) ) ,12) ) ,4,6) ,7) ) ) ) ) ,7) ) +transpose(transpose(transpose(((echo(transpose(shuffle(step(transpose(echo(transpose(X,4) ,4,6) ,-7) ,12) ) ,-7) ,4,6) +transpose(transpose(transpose((transpose(transpose(X,-5) ,-5) |(step(transpose(X,-7) ,12) +transpose((X+transpose(X,7) ) ,-5) ) ) ,4) ,-7) ,7) ) +transpose((step((transpose((X+transpose((X+(X+X) ) ,7) ) ,-7) |echo((((X+transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose((transpose(X,-7) +((X+X) +(X+transpose(X,7) ) ) ) ,7) ) ,4,6) ) ,12) +transpose((((((transpose(X,4) +transpose(arpeggio(X) ,12) ) +transpose(X,-7) ) |transpose(arpeggio(arpeggio(X) ) ,-7) ) +shuffle(shuffle((transpose(X,-7) +step((X+X) ,12) ) ) ) ) +transpose(((transpose((transpose(X,4) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,-7) |(shuffle(step(step(X,12) ,12) ) +transpose((transpose(echo(echo(X,4,6) ,4,6) ,-5) +transpose(((X+X) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,7) ) ) +transpose(arpeggio(((X+shuffle(X) ) +echo((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose(X,-7) ) ,4,6) ) ) ,7) ) ,7) ) ,12) ) ,7) ) ,4) ,-7) ,4) ) +transpose(transpose((transpose(((shuffle(arpeggio((shuffle(X) +transpose(transpose(X,-7) ,12) ) ) ) +transpose(((((transpose(shuffle(X) ,-5) +transpose(transpose(X,-5) ,12) ) +step((X+transpose(X,12) ) ,12) ) |(((X|(X+transpose(X,12) ) ) |(X+X) ) +transpose((X+((X+transpose((X+X) ,4) ) +transpose(X,7) ) ) ,12) ) ) +((transpose((X|X) ,4) |arpeggio(transpose(X,-7) ) ) +transpose(echo(((((X|X) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +X) ,4,6) ,7) ) ) ,4) ) +transpose((((((transpose(step(transpose(X,4) ,12) ,-5) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(X) ) ,4) +(transpose(transpose(X,-5) ,-5) +transpose(step(X,12) ,7) ) ) ,4) ) +transpose((((transpose(X,4) +transpose((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) +transpose((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) +shuffle((transpose((X+X) ,-5) |(X+X) ) ) ) +transpose((transpose(step(step(transpose((transpose(X,4) +transpose(X,12) ) ,-7) ,12) ,12) ,-5) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,4) ) +transpose(transpose(((step((X|X) ,12) +transpose((X|X) ,12) ) +transpose(echo((X+(X+X) ) ,4,6) ,12) ) ,-7) ,7) ) ,7) ) ,4) +transpose(transpose(step(step(((transpose((X|X) ,-5) +transpose((transpose(X,-5) +(X+X) ) ,4) ) |step((transpose(step(X,12) ,-5) +transpose(transpose((X+X) ,4) ,12) ) ,12) ) ,12) ,12) ,4) ,12) ) ,-7) ,7) ) ) ,4,6) +echo(transpose(transpose(transpose(shuffle(transpose(((((shuffle((X+transpose(X,7) ) ) +transpose(((X+transpose(echo(X,4,6) ,7) ) |step(step(X,12) ,12) ) ,4) ) +transpose((step(X,12) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) ,7) ) |(step((X+X) ,12) |transpose(X,-7) ) ) +transpose(echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) ,-5) ) ,4) ) ,4) ,4) ,-5) ,4,6) ) )
random seed used was 267982056

NOTE: Generated phrase was too large ( 40242 ) , it has been truncated at 5000 notes. EXPR = shuffle(transpose(transpose((transpose((transpose(((step(shuffle((transpose(transpose(echo(X,4,6) ,-5) ,-7) +step((((X|X) +transpose((X|X) ,4) ) +transpose(X,7) ) ,12) ) ) ,12) +transpose(((((transpose((((X+X) +transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) |((transpose(X,-5) +transpose(X,12) ) +(X+transpose(echo(X,4,6) ,7) ) ) ) +transpose(((echo(transpose((X+transpose(X,7) ) ,4) ,4,6) +transpose((transpose((X|(echo(X,4,6) |transpose(X,-7) ) ) ,4) |(shuffle(echo(transpose(X,-5) ,4,6) ) |(X+transpose(X,7) ) ) ) ,7) ) |(step(arpeggio(transpose(X,4) ) ,12) +transpose((transpose(X,-5) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ,7) ) ) ,4) ) +transpose(transpose((shuffle(((X+X) |echo((X+X) ,4,6) ) ) +((X|X) +transpose(step(X,12) ,12) ) ) ,-7) ,7) ) |(((arpeggio(transpose(X,-5) ) +(arpeggio((X|X) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,4) ) +transpose(((transpose(shuffle((X|X) ) ,-5) +transpose(echo(X,4,6) ,4) ) +transpose(((X|X) +transpose(X,12) ) ,7) ) ,7) ) ) ,12) ) +transpose(transpose(transpose((transpose(transpose(X,4) ,4) |((X+transpose(transpose(X,-5) ,4) ) +transpose((X|transpose(X,4) ) ,7) ) ) ,-7) ,-7) ,12) ) ,-5) +transpose((transpose((transpose((((((X+X) +transpose(X,7) ) +transpose((echo(X,4,6) |arpeggio(X) ) ,7) ) +((transpose(X,-5) |echo(X,4,6) ) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ) +echo(transpose(echo(transpose(X,-7) ,4,6) ,4) ,4,6) ) ,-7) +transpose(echo((transpose(arpeggio(X) ,4) +transpose(((X+transpose(X,7) ) |X) ,4) ) ,4,6) ,7) ) ,-7) +transpose((transpose(((transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(((X+X) |echo(X,4,6) ) ,7) ) ,-7) +transpose(transpose((arpeggio(X) +transpose(step((X+transpose(X,12) ) ,12) ,12) ) ,4) ,12) ) +transpose((transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) +(transpose(shuffle(X) ,-7) +transpose(((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((transpose(X,-5) |X) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,7) ) ) ,12) ) ,-5) +transpose((((((transpose(transpose(step((X+transpose(X,7) ) ,12) ,-5) ,4) +transpose((X+X) ,-5) ) +transpose(transpose(transpose((((step(X,12) |(X|X) ) +shuffle(X) ) +transpose(((arpeggio(X) +transpose(X,7) ) |((transpose(X,-5) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,7) ) ,-5) ,4) ,4) ) +transpose(transpose((transpose(transpose(transpose(X,4) ,4) ,-7) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(shuffle((X|X) ) ,7) ) ,12) ) ,-7) ,7) ) |arpeggio((transpose(echo(X,4,6) ,-5) +transpose((transpose(X,-5) |(X+transpose(X,12) ) ) ,7) ) ) ) +transpose(transpose((echo(transpose(echo(X,4,6) ,-7) ,4,6) +transpose(arpeggio(transpose(X,4) ) ,4) ) ,4) ,7) ) ,7) ) ,7) ) ,7) ) ,-7) |(((transpose(transpose(transpose((((((X+transpose(X,7) ) +X) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(arpeggio(X) ,7) ) |transpose(transpose(transpose((X+X) ,-5) ,-5) ,-5) ) ,4) ,-5) ,-7) +(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) +transpose(echo(X,4,6) ,4) ) ,-5) +transpose(((transpose((echo(X,4,6) |(transpose(X,-5) |X) ) ,4) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,4) ) +transpose(echo(transpose(((echo(X,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ,4,6) ,7) ) ,12) ) ) |transpose((transpose(transpose((transpose(X,4) +((X+X) |arpeggio(X) ) ) ,-5) ,-7) +((transpose(echo(transpose(X,4) ,4,6) ,-5) |((((transpose(transpose(X,-7) ,4) +transpose((X+transpose(X,7) ) ,-5) ) +((((X|X) |(X+X) ) +transpose(step(step(X,12) ,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose((transpose((X+arpeggio(X) ) ,4) +transpose(arpeggio(transpose((X+transpose(X,7) ) ,-5) ) ,7) ) ,4) ) +transpose(((shuffle((transpose(X,4) |transpose(X,-7) ) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |X) |((X+transpose(X,7) ) |transpose(X,-5) ) ) ,12) ) +transpose((X|X) ,4) ) ,7) ) ) +transpose(echo((step(shuffle(X) ,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,12) ) ) ,-5) ) +transpose((shuffle(transpose(transpose(transpose(((echo(X,4,6) |((X+X) +step(X,12) ) ) +transpose(((transpose(X,-7) +shuffle(X) ) |transpose(X,-7) ) ,12) ) ,4) ,4) ,-5) ) +shuffle(transpose((transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ,-7) +(X+(X+(X+transpose(X,7) ) ) ) ) ,-5) ) ) ,7) ) ) ,-7) ,-7) )
random seed used was 0


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