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:
arpeggio(arpeggio(shuffle(((((shuffle(shuffle(echo(transpose(X,4) ,4,6) ) ) +transpose(((((X+transpose(step(X,12) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose((transpose(transpose(transpose(X,4) ,-5) ,-5) |echo(shuffle((X+transpose(X,7) ) ) ,4,6) ) ,7) ) ,12) ) +transpose(echo(arpeggio(step((((((X|X) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(transpose(X,4) ,-5) ,12) ) +transpose(arpeggio((X+transpose(echo(X,4,6) ,7) ) ) ,7) ) ,12) ) ,4,6) ,7) ) +transpose(transpose((transpose(((step((((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) +transpose(echo(X,4,6) ,12) ) ,12) +transpose((arpeggio(shuffle(((X+transpose(X,12) ) +transpose((X+X) ,12) ) ) ) +transpose((arpeggio(X) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,12) ) ,12) ) |transpose(((((arpeggio(arpeggio(transpose(X,4) ) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) +transpose(step(X,12) ,4) ) +transpose((X+transpose(arpeggio(X) ,7) ) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ) ,4) |transpose((arpeggio(step(transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,4) ,12) ) +transpose((((X+transpose(arpeggio(X) ,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) |((X+transpose(X,12) ) +transpose(X,12) ) ) ,7) ) ,-7) ) ,-7) ,7) ) +transpose(arpeggio(((((((transpose(echo(X,4,6) ,-5) +transpose(((transpose((shuffle(X) +transpose((step(X,12) +transpose(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,-7) +transpose((step(transpose((X+transpose(X,12) ) ,4) ,12) +transpose(transpose(((X+transpose(transpose(X,4) ,12) ) |transpose(echo(X,4,6) ,4) ) ,-5) ,12) ) ,4) ) +transpose(echo(echo(shuffle(X) ,4,6) ,4,6) ,7) ) ,4) ) +transpose((((transpose(transpose(shuffle(X) ,4) ,-5) +transpose(((echo(((X+transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) +transpose((X+transpose(transpose(X,4) ,7) ) ,12) ) +transpose(echo(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ,12) ) ,4) ) +transpose(((echo(transpose(X,4) ,4,6) +transpose((((X+X) +transpose((X|(X+transpose(X,12) ) ) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(echo(((X|X) +transpose((X+transpose(X,12) ) ,12) ) ,4,6) ,7) ) ,7) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(arpeggio(X) ,12) ) +transpose(step(((echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,7) ) ,12) ,7) ) ,-7) ,7) ) ,7) ) +transpose(shuffle(shuffle(transpose(transpose(transpose((X|transpose(X,-7) ) ,-7) ,-5) ,-7) ) ) ,4) ) +transpose((((transpose(shuffle(X) ,-5) +transpose(X,-7) ) +(shuffle(echo(arpeggio(transpose(X,4) ) ,4,6) ) +transpose(step(echo(X,4,6) ,12) ,12) ) ) +transpose(step(transpose((X+X) ,-5) ,12) ,7) ) ,7) ) +((arpeggio(((step((echo(X,4,6) +transpose(arpeggio(X) ,12) ) ,12) +transpose((transpose((X+transpose(X,7) ) ,4) +transpose(shuffle(X) ,7) ) ,4) ) +transpose((shuffle(transpose(X,4) ) +transpose(((arpeggio(X) +transpose(X,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,7) ) ,7) ) ) +transpose(transpose(echo(arpeggio(((X+X) +(X+X) ) ) ,4,6) ,-7) ,4) ) +transpose((transpose((((echo(arpeggio(X) ,4,6) +transpose(transpose(step(X,12) ,-7) ,4) ) +transpose(((((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) +((((arpeggio(X) +transpose(shuffle(X) ,7) ) +transpose((X|X) ,4) ) +transpose(step(X,12) ,4) ) +transpose(arpeggio((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) ) ,7) ) ) ,-7) +transpose(arpeggio(transpose(shuffle(step(X,12) ) ,-5) ) ,7) ) ,7) ) ) +transpose((shuffle((((step(transpose(X,4) ,12) +transpose(((((X+X) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(X,12) ) ,12) ) +(transpose(shuffle(X) ,-5) +transpose(shuffle(X) ,7) ) ) +arpeggio((transpose(step(X,12) ,4) +transpose(step(shuffle(X) ,12) ,7) ) ) ) ) +transpose(((step(shuffle(((transpose(X,-7) +transpose(step(X,12) ,7) ) |(X+transpose(X,12) ) ) ) ,12) +transpose((arpeggio(arpeggio(arpeggio(echo(X,4,6) ) ) ) +transpose((transpose(echo((step(X,12) +transpose(transpose(X,4) ,7) ) ,4,6) ,-7) +transpose(echo(echo(echo(shuffle(X) ,4,6) ,4,6) ,4,6) ,12) ) ,12) ) ,4) ) +transpose(((echo(((step(X,12) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) |arpeggio(echo(X,4,6) ) ) +transpose(((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4) +transpose(transpose(X,4) ,4) ) +transpose(((shuffle(X) +transpose((X|X) ,12) ) +transpose(step(shuffle(X) ,12) ,12) ) ,7) ) ,7) ) ,7) ) ,12) ) ,7) ) ) ,7) ) ) ) )
random seed used was 233625897 EXPR = transpose(((shuffle((step(arpeggio(arpeggio(transpose(echo(X,4,6) ,4) ) ) ,12) |(((shuffle((arpeggio(X) +transpose(X,12) ) ) +transpose(((((echo((((step(arpeggio(X) ,12) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(step(X,12) ,12) ) ,4,6) +transpose(((transpose(echo(X,4,6) ,-7) +transpose(transpose((arpeggio(X) +transpose(transpose(X,4) ,12) ) ,-7) ,4) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) ,7) ) +transpose(shuffle(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +((X+X) |X) ) ) ) ,12) ) +transpose(arpeggio(arpeggio(((step(X,12) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ) ) ,4) ) +transpose((arpeggio((echo(X,4,6) +transpose(X,7) ) ) +transpose(transpose((X+X) ,4) ,12) ) ,7) ) ,12) ) +((arpeggio((shuffle((X+transpose(X,7) ) ) +step(transpose((X+X) ,-5) ,12) ) ) +transpose(((step(((X+X) +(((X+transpose(X,7) ) +transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) ) ,12) +((echo(step(((arpeggio(X) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,12) ,4,6) +arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ) +transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X+transpose(transpose(echo(X,4,6) ,-5) ,12) ) ,12) ) ,12) ) ) +((transpose(((transpose(X,4) +transpose((echo(X,4,6) +transpose((X|X) ,12) ) ,12) ) +step(arpeggio(X) ,12) ) ,4) +transpose(step(transpose(X,4) ,12) ,7) ) +transpose(step(transpose(X,4) ,12) ,7) ) ) ,4) ) +transpose(((step(transpose(transpose(step(X,12) ,-5) ,4) ,12) +transpose(step((((((X+X) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ,12) ) +(arpeggio(X) +transpose(((X+transpose((((X+X) +transpose((X+transpose(X,7) ) ,7) ) |step(transpose(X,-7) ,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ) ,7) ) ) +arpeggio(shuffle((((shuffle(X) +transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,7) ) |step(X,12) ) ,7) ) +transpose(((shuffle(arpeggio(X) ) +transpose(X,12) ) +(X+transpose(((arpeggio(X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,7) ) ) ,12) ) ) ) ) ) ) |transpose(((echo((((((echo(echo(X,4,6) ,4,6) +transpose(step(step(arpeggio(X) ,12) ,12) ,4) ) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose((X+step(X,12) ) ,7) ) ,7) ) +transpose((transpose(X,4) +(transpose(transpose(X,-5) ,-5) +transpose((X|X) ,12) ) ) ,4) ) +transpose((step(echo(X,4,6) ,12) +((X+transpose(echo(X,4,6) ,7) ) +transpose(step(X,12) ,7) ) ) ,7) ) |((((transpose(X,4) +shuffle(X) ) +transpose(arpeggio((arpeggio(X) +transpose(transpose(X,-7) ,12) ) ) ,4) ) +transpose(transpose(transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) ,-7) ,7) ) +transpose((((step((((X+transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) +transpose((transpose(X,4) +transpose(arpeggio((X+transpose((X+transpose(X,12) ) ,7) ) ) ,7) ) ,4) ) +transpose((step(shuffle(arpeggio(X) ) ,12) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ,7) ) +(((X+transpose(X,7) ) +transpose(step(X,12) ,7) ) +transpose((X+transpose(X,-5) ) ,12) ) ) ,7) ) ) ,4,6) +transpose(step(transpose(arpeggio(((X+transpose(X,12) ) +shuffle(X) ) ) ,-7) ,12) ,4) ) +transpose((((step(transpose((X+transpose(X,12) ) ,-7) ,12) +transpose((echo((((X+X) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4,6) +transpose(arpeggio(X) ,12) ) ,12) ) +transpose(arpeggio(transpose((X+transpose(echo(arpeggio(X) ,4,6) ,12) ) ,-5) ) ,12) ) +transpose((echo((transpose(step((X+transpose(X,12) ) ,12) ,4) +transpose((echo(X,4,6) +step(X,12) ) ,7) ) ,4,6) +transpose(step((((X+transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,7) ) +((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ,7) ) ,7) ) ,7) ) ,-7) ) +transpose(transpose(step((echo(echo(arpeggio(transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ,-7) ) ,4,6) ,4,6) +transpose(shuffle(step(step(step(transpose(X,-7) ,12) ,12) ,12) ) ,12) ) ,12) ,-5) ,12) ) ,-5)
random seed used was 0 EXPR = (((step(transpose(step((arpeggio(echo((arpeggio((X+X) ) +(step(X,12) +transpose(echo(X,4,6) ,12) ) ) ,4,6) ) +transpose(transpose(transpose((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ,-5) ,4) ,7) ) ,12) ,4) ,12) |(arpeggio((echo(echo((((((arpeggio(transpose((((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) |step(transpose(X,-5) ,12) ) ,-5) ) +transpose((((transpose(transpose(X,-5) ,4) +transpose(echo(X,4,6) ,7) ) +(transpose(shuffle(X) ,4) +transpose(arpeggio(shuffle(X) ) ,7) ) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(((((((X+transpose(X,12) ) +(X|X) ) +transpose(shuffle((X|X) ) ,4) ) +transpose(X,7) ) +transpose(arpeggio(transpose((X+transpose(X,7) ) ,4) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,7) ) ,7) ) ,7) ) +transpose(transpose(arpeggio(((X+transpose(X,12) ) +transpose(arpeggio(echo(X,4,6) ) ,12) ) ) ,4) ,12) ) +transpose((((step(X,12) +transpose(transpose(X,4) ,7) ) +transpose(echo(echo(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) ) ,4,6) ,4,6) ,4) ) +transpose((X+transpose(((X|step((X+transpose(X,12) ) ,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,7) ) ,4) ) +transpose(arpeggio(transpose(echo(X,4,6) ,-5) ) ,7) ) ,4,6) ,4,6) +transpose(arpeggio((transpose(echo(((shuffle(X) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ,-7) +echo(arpeggio(step(((X+transpose(shuffle(X) ,7) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ,12) ) ,4,6) ) ) ,12) ) ) +arpeggio(shuffle((arpeggio(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ) +arpeggio(arpeggio(step(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ,12) ) ) ) ) ) ) ) +(transpose(step(transpose(((((X+transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(echo((arpeggio(echo(X,4,6) ) |step(X,12) ) ,4,6) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) ,4) ,12) ,-7) +transpose(shuffle(step(echo((transpose(step(echo(X,4,6) ,12) ,-5) +transpose(transpose(arpeggio((transpose(step(X,12) ,4) +transpose(echo(X,4,6) ,7) ) ) ,-7) ,12) ) ,4,6) ,12) ) ,12) ) ) +transpose(((echo(echo(echo(arpeggio(shuffle(shuffle(transpose((shuffle(X) +transpose(X,7) ) ,-5) ) ) ) ,4,6) ,4,6) ,4,6) +transpose((transpose(((shuffle(transpose(transpose(X,4) ,-5) ) +transpose((echo((transpose(echo(X,4,6) ,-5) +transpose((X+shuffle(X) ) ,12) ) ,4,6) +transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) |transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(echo(X,4,6) ,12) ) +transpose(echo(X,4,6) ,12) ) ,-5) ) ,12) ) ,12) ) +(step(((((X+transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(step(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,12) ,7) ) +transpose(shuffle((arpeggio(shuffle(X) ) +transpose(shuffle(transpose(X,-7) ) ,12) ) ) ,7) ) ,12) +transpose(((step((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) +shuffle(transpose(transpose(X,-5) ,-5) ) ) +transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ,7) ) ) ,4) +transpose(((arpeggio(echo((shuffle(shuffle((echo(X,4,6) |step((X+X) ,12) ) ) ) +transpose((((X|X) +transpose(X,12) ) +transpose(step((transpose(X,-5) +shuffle(X) ) ,12) ,12) ) ,4) ) ,4,6) ) +transpose((step(((((step((((X+X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,12) |((arpeggio(X) +transpose(X,4) ) +transpose((arpeggio(X) +transpose(X,12) ) ,7) ) ) +transpose(transpose(((((step((X+X) ,12) +transpose(X,4) ) +transpose(((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(transpose(transpose((X+X) ,-5) ,-5) ,7) ) +transpose(arpeggio(((X+X) +transpose(X,7) ) ) ,7) ) ,-5) ,4) ) +transpose(arpeggio((echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) ) ,7) ) +transpose(((shuffle((arpeggio(X) +transpose(echo(X,4,6) ,12) ) ) +transpose(((arpeggio(((X+transpose(step(transpose(X,4) ,12) ,4) ) +transpose(X,7) ) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose((((echo(X,4,6) +transpose(X,12) ) +transpose(X,7) ) +step(X,12) ) ,7) ) ,4) ) +transpose((shuffle(echo(X,4,6) ) +transpose(((X+transpose(X,12) ) +arpeggio((X+transpose(X,7) ) ) ) ,12) ) ,7) ) ,7) ) ,12) |(arpeggio((shuffle(step((X+transpose(step(X,12) ,12) ) ,12) ) +transpose(((transpose(step(transpose((X|X) ,-5) ,12) ,-5) +transpose(step(shuffle(shuffle(X) ) ,12) ,7) ) +transpose(transpose((echo(transpose(X,-7) ,4,6) +transpose((X|echo(X,4,6) ) ,12) ) ,-5) ,7) ) ,7) ) ) +transpose(step((((echo(((X+transpose((arpeggio(X) +transpose(step(X,12) ,12) ) ,12) ) +transpose(echo(step((X+transpose(X,12) ) ,12) ,4,6) ,7) ) ,4,6) +transpose(arpeggio(echo((echo((X+transpose(X,7) ) ,4,6) +(X+(X+transpose(X,12) ) ) ) ,4,6) ) ,12) ) +transpose((transpose(echo((X|X) ,4,6) ,4) +transpose(echo(arpeggio((X|X) ) ,4,6) ,12) ) ,4) ) +transpose(((X+transpose(arpeggio(shuffle(X) ) ,7) ) +transpose(((transpose((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,12) ,-7) ) ) ,12) ) +((echo(arpeggio(shuffle(arpeggio((shuffle((X+transpose(X,12) ) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) ,4) ,7) ) ) ) ) ,4,6) +transpose(transpose(step(((((shuffle(shuffle(X) ) +transpose(((X+transpose(X,12) ) +echo(X,4,6) ) ,12) ) +transpose((((((X+transpose(X,7) ) +transpose(shuffle(X) ,12) ) +transpose((X+transpose((shuffle(X) +transpose(X,12) ) ,7) ) ,7) ) |(transpose(X,-7) |(X|arpeggio(X) ) ) ) |(((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4) ) +transpose((arpeggio((transpose(X,-7) +transpose(X,12) ) ) +transpose((((transpose(echo(X,4,6) ,-7) |(echo(X,4,6) +transpose(arpeggio(X) ,7) ) ) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(transpose(step(transpose(X,-5) ,12) ,4) ,7) ) ,7) ) ,7) ) +transpose(((transpose(X,-5) |transpose((X+transpose(X,7) ) ,-5) ) |(((transpose(transpose(step(X,12) ,-5) ,4) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose((shuffle(echo(X,4,6) ) +transpose(echo(X,4,6) ,12) ) ,7) ) +transpose((((transpose(X,-5) +transpose(((X+transpose(X,12) ) +(X+transpose(X,7) ) ) ,12) ) +step(X,12) ) +transpose(((transpose(X,-7) +transpose(X,12) ) +transpose((X+X) ,12) ) ,7) ) ,7) ) ) ,12) ) ,12) ,-7) ,4) ) +transpose((echo((echo(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,4,6) +(step((echo(step((X+X) ,12) ,4,6) +transpose(transpose(step(X,12) ,-7) ,12) ) ,12) +transpose((((step(shuffle(X) ,12) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(((X+transpose(echo(X,4,6) ,7) ) |shuffle(arpeggio(X) ) ) ,4) ,7) ) +transpose((arpeggio(transpose(step(transpose(X,-5) ,12) ,4) ) +(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) |transpose(shuffle(X) ,-7) ) ) ,7) ) ,12) ) ) ,4,6) +transpose(((step(transpose(((((X+X) |(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose(arpeggio(X) ,12) ) ) +transpose(shuffle((((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) +transpose((X+transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) ,7) ) ) ,4) ) +transpose(transpose(((X+transpose((X+X) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,-5) ,7) ) ,-5) ,12) +transpose(((((X+transpose(((step(shuffle(X) ,12) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step((transpose(X,-5) +((X+transpose(transpose(X,-5) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) ) ,12) ,7) ) +transpose(((transpose(transpose(step(X,12) ,-5) ,4) +transpose(echo((X+echo(shuffle(X) ,4,6) ) ,4,6) ,4) ) +transpose(shuffle((step(X,12) +arpeggio(X) ) ) ,7) ) ,7) ) +transpose((echo(X,4,6) |((transpose((((transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) ,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) ,12) ) +transpose((X|X) ,7) ) ) ,12) ) ,4) ) +transpose((((((((arpeggio(transpose(X,-7) ) +transpose(step(X,12) ,7) ) +transpose(((X|X) +transpose(transpose(X,4) ,7) ) ,12) ) +transpose(transpose((X+transpose(transpose(X,-7) ,7) ) ,4) ,4) ) +transpose(X,7) ) +transpose((transpose((((shuffle(X) +transpose((X+transpose(X,7) ) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4) |(X+X) ) ,4) ) +transpose(transpose(((arpeggio(((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) +transpose((X+transpose(step(X,12) ,12) ) ,12) ) +((((X+X) +transpose(X,12) ) +transpose(arpeggio((X|X) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) ) ,-7) ,7) ) |transpose(shuffle(step(X,12) ) ,-5) ) ,7) ) ,7) ) ,7) ) ) ,12) ) ,4) ) +transpose(((((((shuffle((((X+transpose(arpeggio(X) ,12) ) +transpose(((X+transpose(X,7) ) +transpose(X,-7) ) ,4) ) +transpose((echo(X,4,6) +transpose(transpose(X,-7) ,7) ) ,7) ) ) +transpose((echo(step(((X+transpose((X+transpose((X|X) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,12) ,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ,12) ) ,7) ) +transpose(echo((arpeggio((step((X+transpose(X,7) ) ,12) +transpose((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ) +((((transpose(transpose(step(echo(X,4,6) ,12) ,-5) ,-7) +transpose((shuffle(shuffle(X) ) |(X|X) ) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) +transpose(transpose((X+X) ,4) ,4) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) ,-7) ,7) ) ) ,4,6) ,4) ) +transpose(((step((transpose(X,-7) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,12) |(echo(arpeggio(X) ,4,6) +transpose(((step((X+X) ,12) +transpose(arpeggio(X) ,12) ) +transpose((echo(X,4,6) +transpose(((X+X) +transpose(arpeggio(X) ,12) ) ,12) ) ,12) ) ,7) ) ) +transpose((((step((X+transpose((X+transpose(X,12) ) ,7) ) ,12) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(X,7) ) ,7) ) ,7) ) +transpose(echo(shuffle(step(arpeggio(transpose(echo(X,4,6) ,4) ) ,12) ) ,4,6) ,12) ) +(((step(step(echo(transpose((X|shuffle(X) ) ,-7) ,4,6) ,12) ,12) +transpose(echo(transpose(transpose((((transpose((X+X) ,4) +step(X,12) ) +transpose((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,12) ) ,7) ) +transpose(step(arpeggio((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) ) ,12) ,12) ) ,-5) ,-7) ,4,6) ,7) ) +transpose((echo((step(transpose(transpose(shuffle(((X|X) |transpose(X,-7) ) ) ,-7) ,-7) ,12) +transpose((arpeggio(arpeggio(((echo(X,4,6) +transpose(X,7) ) +X) ) ) +transpose(echo(step((step(X,12) +transpose(transpose(X,-7) ,12) ) ,12) ,4,6) ,12) ) ,12) ) ,4,6) +transpose(arpeggio((((shuffle(((transpose((X|X) ,-5) +transpose(((transpose(X,4) |(X+transpose(X,12) ) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,4) ) +transpose(step(shuffle(step(X,12) ) ,12) ,7) ) ) +transpose((echo(X,4,6) |transpose(echo(X,4,6) ,-5) ) ,4) ) +transpose(arpeggio(X) ,7) ) +((arpeggio(echo((X+transpose(X,7) ) ,4,6) ) +transpose(transpose(step((shuffle((X+transpose(X,7) ) ) |((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) ,12) ,4) ,4) ) +transpose(transpose((arpeggio(X) |((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) ) ,-7) ,7) ) ) ) ,12) ) ,4) ) +transpose((step(((((shuffle(shuffle((X+transpose(X,7) ) ) ) +transpose(echo(shuffle(shuffle(((X+transpose(transpose(X,-5) ,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,4,6) ,12) ) +transpose(echo(step(shuffle(transpose((X+X) ,-5) ) ,12) ,4,6) ,4) ) +transpose((shuffle(echo((echo(arpeggio(X) ,4,6) +(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+X) ,7) ) |X) +transpose((X+transpose(X,7) ) ,4) ) +transpose((step(X,12) +transpose(X,12) ) ,7) ) ) ,4,6) ) +transpose(((((arpeggio(X) +transpose(step(X,12) ,7) ) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) +transpose(((transpose(X,4) +transpose(transpose(X,4) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) +transpose((arpeggio(shuffle(X) ) +transpose(((arpeggio(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,12) ) ,7) ) +transpose(((((((transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-7) +transpose(step(((shuffle(((X+transpose(X,12) ) +X) ) +transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,12) ,12) ) +transpose(step((X+transpose(shuffle(((X+transpose(X,12) ) +transpose(X,7) ) ) ,12) ) ,12) ,12) ) +transpose(echo((arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +transpose(echo((((X+transpose(shuffle(X) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,12) ) ,4,6) ,4) ) +transpose(shuffle((((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) +transpose((X+transpose(step(X,12) ,7) ) ,7) ) +transpose((((((X+transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(step(transpose((X+transpose(X,7) ) ,-7) ,12) ,7) ) +transpose((arpeggio(shuffle(X) ) +transpose(((transpose(X,-5) +transpose(((X+X) +X) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(X,4) ) ,7) ) ,12) ) ,12) ) ,12) ) ) ,7) ) +transpose(((((((X+transpose(((arpeggio(X) +transpose(X,7) ) +transpose(arpeggio((X+X) ) ,12) ) ,4) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose((X+transpose((X|X) ,7) ) ,4) ,7) ) +transpose((shuffle(echo(X,4,6) ) +transpose((arpeggio(X) +transpose((echo(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) |(shuffle(X) |echo(step(X,12) ,4,6) ) ) ,12) ) ,7) ) ,7) ) +transpose(transpose((transpose((X+X) ,-7) +transpose(arpeggio(transpose(shuffle(X) ,-7) ) ,12) ) ,-7) ,12) ) ,4) ) +transpose((((arpeggio(arpeggio(transpose(X,-7) ) ) +transpose(step(X,12) ,4) ) +transpose(echo(shuffle(transpose(X,-5) ) ,4,6) ,7) ) +transpose(((shuffle(((transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) +(((X+X) +transpose(transpose(X,4) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ) +transpose((X|step((X+transpose(X,12) ) ,12) ) ,12) ) ) +transpose(((step((transpose(X,-7) +transpose(X,7) ) ,12) +transpose(arpeggio(transpose(step(X,12) ,-5) ) ,4) ) +transpose(((((step(transpose(X,4) ,12) +transpose((X+transpose(step(X,12) ,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(step(X,12) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,7) ) ,4) ) +transpose(step((echo(X,4,6) +transpose(arpeggio(((X+transpose(X,7) ) +X) ) ,12) ) ,12) ,7) ) ,7) ) ,7) ) ,12) ) ,12) |transpose((((((X|X) +arpeggio(X) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(step(X,12) ,4) ,12) ) +transpose(transpose((X+transpose(transpose(X,4) ,7) ) ,4) ,7) ) ,-7) ) ,7) ) ) +transpose(step((echo((echo(((shuffle(arpeggio((((X+transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ) ) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose((echo(X,4,6) +((((echo(X,4,6) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) |((transpose(X,-5) +transpose((X|X) ,4) ) +transpose(X,7) ) ) |transpose(echo(transpose(X,-5) ,4,6) ,-7) ) ) ,7) ) ,4,6) |transpose(shuffle(((((X+transpose(X,7) ) +transpose(X,12) ) +transpose(echo(X,4,6) ,12) ) +transpose(echo(transpose(transpose(X,4) ,-5) ,4,6) ,7) ) ) ,-7) ) ,4,6) +echo(transpose(shuffle(arpeggio((X+transpose(X,7) ) ) ) ,-5) ,4,6) ) ,12) ,4) ) ,7) ) ,12) )
random seed used was 0

NOTE: Generated phrase was too large ( 6762 ) , it has been truncated at 5000 notes. EXPR = step((echo(echo(transpose(transpose(transpose(shuffle(((((transpose((X+transpose(X,7) ) ,4) +transpose(transpose(echo(echo(X,4,6) ,4,6) ,4) ,7) ) |echo(arpeggio(transpose(((X+transpose(transpose(X,-5) ,12) ) +transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) ,4) ) ,4,6) ) +transpose((((transpose((X+transpose(shuffle(arpeggio(X) ) ,12) ) ,-7) +transpose(echo(shuffle(transpose(X,-5) ) ,4,6) ,12) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(arpeggio(shuffle(X) ) ,7) ) +transpose(shuffle(arpeggio((X+X) ) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(echo(transpose(step((X+transpose(X,12) ) ,12) ,-5) ,4,6) ,-5) ,7) ) ) ,4) ,-7) ,-7) ,4,6) ,4,6) +transpose(transpose(transpose(transpose(((((((arpeggio(arpeggio(X) ) +transpose(((echo(X,4,6) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +step((X+X) ,12) ) +transpose(step(((transpose(X,4) +transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ,12) ) +transpose(transpose(transpose(transpose((X+X) ,-7) ,4) ,-7) ,7) ) +transpose((step((((X+transpose(((X+transpose(X,7) ) +transpose(step(X,12) ,12) ) ,4) ) +transpose((X|X) ,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) +transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) +transpose((transpose((X+transpose(X,7) ) ,4) |((X+transpose(X,7) ) +X) ) ,12) ) +transpose(step((transpose(X,4) +(X+transpose(X,7) ) ) ,12) ,4) ) +transpose(((X+(X+transpose(X,7) ) ) +transpose(((X+X) +transpose(step((X|X) ,12) ,7) ) ,7) ) ,7) ) ,12) ) ,7) ) ,4) ,-7) ,-5) ,12) ) ,12)
random seed used was 0


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