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(transpose(((shuffle((((transpose(transpose(transpose(arpeggio(step((arpeggio(shuffle(X) ) |shuffle(step(X,12) ) ) ,12) ) ,4) ,-5) ,-5) |step((step((step(arpeggio(step(X,12) ) ,12) |transpose((step(X,12) |transpose(X,-5) ) ,4) ) ,12) +(arpeggio(transpose(X,4) ) +transpose(transpose((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +X) ) +transpose(transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) ,4) ,7) ) ) ,12) ) +transpose((echo(transpose((shuffle((shuffle((shuffle(transpose(X,-7) ) +transpose((X+transpose(X,12) ) ,12) ) ) +transpose(step((X+(arpeggio(shuffle(X) ) |(arpeggio(shuffle(X) ) |arpeggio(X) ) ) ) ,12) ,12) ) ) +arpeggio(step(((transpose(shuffle((X+X) ) ,-7) +(step(X,12) +transpose(echo(X,4,6) ,12) ) ) |arpeggio(shuffle(step(X,12) ) ) ) ,12) ) ) ,4) ,4,6) |echo(((((echo((step(echo(echo(X,4,6) ,4,6) ,12) +transpose(arpeggio((X+X) ) ,7) ) ,4,6) +transpose(step((((transpose((X+X) ,-5) +transpose(transpose(X,4) ,-5) ) |(X+X) ) +transpose(echo(shuffle(echo(echo(X,4,6) ,4,6) ) ,4,6) ,12) ) ,12) ,4) ) +transpose(((((X+transpose(X,7) ) +transpose(X,12) ) +((echo(X,4,6) +transpose((X+X) ,4) ) +transpose(X,7) ) ) |(echo(arpeggio(X) ,4,6) +transpose(((shuffle(X) +transpose((shuffle(X) |transpose(X,4) ) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ) ,7) ) +transpose(((transpose(arpeggio((step(X,12) +transpose(X,-7) ) ) ,-7) +transpose((transpose(echo(step(step(shuffle(transpose(X,4) ) ,12) ,12) ,4,6) ,-7) +transpose(transpose(X,-7) ,-7) ) ,7) ) +((echo((X+transpose(X,7) ) ,4,6) +shuffle(transpose(X,4) ) ) +transpose((((transpose(echo(X,4,6) ,-7) +transpose(echo(X,4,6) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) +transpose(transpose(step(transpose(X,-5) ,12) ,-7) ,12) ) ,7) ) ) ,4) ) +transpose(transpose(transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) ) ,-5) ,-7) ,7) ) ,4,6) ) ,4) ) +transpose((((((transpose(echo(transpose(X,-5) ,4,6) ,4) |(X+step(X,12) ) ) +transpose(echo((X+X) ,4,6) ,7) ) +transpose(transpose((((arpeggio(((X+transpose(X,7) ) |arpeggio(X) ) ) +transpose(((X|X) +shuffle(step(X,12) ) ) ,4) ) +transpose(echo(((X+transpose(X,12) ) +transpose(X,7) ) ,4,6) ,7) ) +transpose(shuffle((transpose(transpose((X|X) ,-7) ,4) +echo(echo(X,4,6) ,4,6) ) ) ,12) ) ,4) ,4) ) +transpose((step((transpose(X,-7) +step(shuffle(X) ,12) ) ,12) +transpose((transpose(echo(step(arpeggio(X) ,12) ,4,6) ,-5) +transpose(((transpose((X+transpose(echo(X,4,6) ,12) ) ,4) +transpose(echo((((X|X) +echo(X,4,6) ) +transpose((echo(X,4,6) +arpeggio(X) ) ,12) ) ,4,6) ,4) ) +transpose(transpose(transpose(step(X,12) ,4) ,4) ,7) ) ,7) ) ,7) ) ,7) ) +transpose(arpeggio(echo(transpose((transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) +transpose((arpeggio((X+arpeggio(X) ) ) +transpose(shuffle((X+transpose(X,7) ) ) ,-7) ) ,12) ) ,-7) ,4,6) ) ,12) ) ,7) ) ) +transpose((((transpose((transpose(arpeggio(echo(shuffle(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |step(X,12) ) ,-5) ) ,4,6) ) ,-7) +transpose(transpose(transpose(((echo(arpeggio(X) ,4,6) +((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose((shuffle(step(X,12) ) +transpose(((transpose(X,4) |X) |echo((X+transpose(X,7) ) ,4,6) ) ,7) ) ,7) ) ,-7) ,4) ,12) ) ,4) +shuffle(arpeggio(((transpose(((shuffle(X) +transpose(echo(shuffle(X) ,4,6) ,7) ) +(((shuffle(arpeggio((X+X) ) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(transpose(X,-7) ,7) ) +echo(X,4,6) ) ) ,-5) +transpose((echo((transpose(((X+transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) ,4) +(arpeggio(X) +(((X|X) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ) ) ,4,6) +transpose(transpose(X,-7) ,4) ) ,4) ) +transpose((shuffle(transpose(step(step(transpose(X,-7) ,12) ,12) ,-7) ) |arpeggio(step(X,12) ) ) ,7) ) ) ) ) +transpose(echo(((transpose(step((step(X,12) +transpose(shuffle(X) ,4) ) ,12) ,-7) |arpeggio(shuffle(shuffle(transpose(step(X,12) ,-7) ) ) ) ) |shuffle(transpose(step(step((arpeggio(echo(shuffle(transpose(X,-5) ) ,4,6) ) +((step(X,12) +arpeggio(echo(X,4,6) ) ) +transpose((X+X) ,12) ) ) ,12) ,12) ,4) ) ) ,4,6) ,4) ) +transpose(echo(echo(echo(transpose(shuffle(step(step(X,12) ,12) ) ,-5) ,4,6) ,4,6) ,4,6) ,7) ) ,7) ) +echo(shuffle(echo((arpeggio(((transpose((transpose((X|X) ,-5) +transpose(arpeggio(X) ,7) ) ,-5) +transpose(step((echo(X,4,6) +(transpose(transpose(X,4) ,-5) +arpeggio(shuffle(X) ) ) ) ,12) ,7) ) +shuffle(echo(X,4,6) ) ) ) +transpose(transpose(((((((X+transpose(X,12) ) |echo(arpeggio(shuffle(echo(X,4,6) ) ) ,4,6) ) +transpose((shuffle(arpeggio(transpose(X,-5) ) ) |(X+transpose(X,4) ) ) ,4) ) +transpose(transpose((arpeggio(transpose(X,4) ) +transpose(transpose((X|X) ,4) ,12) ) ,-7) ,7) ) |transpose((transpose((X|X) ,-7) +transpose(transpose(arpeggio((X|X) ) ,-5) ,7) ) ,-5) ) +transpose(transpose((transpose(X,-5) +step(shuffle((X+transpose(X,12) ) ) ,12) ) ,4) ,12) ) ,-7) ,12) ) ,4,6) ) ,4,6) ) ,-7) ,12) ,-7)
random seed used was 2

NOTE: Generated phrase was too large ( 14412 ) , it has been truncated at 5000 notes. EXPR = transpose((transpose((transpose(echo((echo((((echo((X+X) ,4,6) +echo(shuffle(transpose(transpose(X,4) ,-7) ) ,4,6) ) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) +(transpose((transpose(transpose(X,-7) ,4) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,-7) +transpose(shuffle(arpeggio(((transpose(X,-5) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ) ) ,12) ) ) ,4,6) +arpeggio(((arpeggio(transpose(X,-7) ) +shuffle(echo(X,4,6) ) ) +transpose((((X+transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(transpose((X|X) ,-7) ,-5) ,7) ) ,7) ) ) ) ,4,6) ,-7) +arpeggio((transpose(arpeggio(shuffle(arpeggio(shuffle(step(transpose(step((X|X) ,12) ,-5) ,12) ) ) ) ) ,4) +transpose(shuffle(arpeggio(arpeggio(echo(arpeggio(transpose(transpose(X,4) ,4) ) ,4,6) ) ) ) ,12) ) ) ) ,-5) +transpose(step(echo(echo(shuffle(transpose(shuffle((arpeggio(step(X,12) ) +transpose(transpose(transpose((X+transpose(echo(X,4,6) ,7) ) ,-5) ,4) ,12) ) ) ,-7) ) ,4,6) ,4,6) ,12) ,7) ) ,-7)
random seed used was 0 EXPR = echo(transpose(arpeggio(transpose(((step(((step(shuffle(arpeggio(X) ) ,12) |((arpeggio(echo(transpose(X,-5) ,4,6) ) +((shuffle(echo(transpose(X,-7) ,4,6) ) |((X+transpose(X,7) ) +X) ) |transpose((step(X,12) +(X|X) ) ,-5) ) ) +transpose(echo(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(((X+transpose(X,7) ) +arpeggio(shuffle(X) ) ) ,7) ) ,4,6) ,12) ) ) +transpose((arpeggio(step((transpose(((shuffle(X) +transpose((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) |step((X|(X+transpose(X,7) ) ) ,12) ) ,12) ) |arpeggio(((transpose(transpose(transpose(X,-5) ,4) ,-5) |(step(X,12) +shuffle(transpose(X,4) ) ) ) |shuffle(echo((X+transpose(X,7) ) ,4,6) ) ) ) ) ,7) ) ,12) |arpeggio(echo(transpose((transpose(step(transpose(transpose(arpeggio(echo(X,4,6) ) ,4) ,4) ,12) ,-5) +((((transpose(transpose((X+transpose(X,12) ) ,4) ,-7) +shuffle(X) ) |(transpose(X,-5) +transpose(shuffle(X) ,7) ) ) +transpose(arpeggio((transpose(transpose(transpose((X|X) ,-5) ,-5) ,-5) +transpose(transpose(((step(transpose(X,4) ,12) +transpose(shuffle(X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ,7) ) ) ,4) ) +transpose(arpeggio(arpeggio(((X+transpose(X,12) ) +transpose(step(transpose(X,4) ,12) ,7) ) ) ) ,7) ) ) ,-7) ,4,6) ) ) +transpose((((transpose(transpose((((((((echo(X,4,6) +X) +transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) |arpeggio((shuffle(X) +transpose(step(X,12) ,12) ) ) ) |arpeggio((arpeggio(X) +step(X,12) ) ) ) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-7) ,4) ) +transpose((transpose(transpose(transpose(echo(X,4,6) ,-5) ,4) ,4) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) |(X|X) ) ,7) ) ,7) ) ,4) ,4) +transpose(step(echo(echo(step(echo(X,4,6) ,12) ,4,6) ,4,6) ,12) ,12) ) +transpose(transpose(arpeggio((transpose(X,-7) +transpose(step(transpose(((X|X) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,12) ,7) ) ) ,4) ,4) ) +transpose(((echo(arpeggio((arpeggio(transpose(shuffle(step(echo(X,4,6) ,12) ) ,-5) ) |step(transpose(transpose(transpose((X|X) ,4) ,-5) ,4) ,12) ) ) ,4,6) +transpose(transpose((transpose(shuffle((shuffle(step(X,12) ) +((shuffle(X) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ) ) ,-5) +echo(transpose((transpose(arpeggio(echo(X,4,6) ) ,4) |transpose(shuffle(X) ,4) ) ,-7) ,4,6) ) ,4) ,7) ) +shuffle((arpeggio(echo((transpose(arpeggio(X) ,4) +step(step(step(step(X,12) ,12) ,12) ,12) ) ,4,6) ) +transpose((transpose(transpose((transpose(arpeggio(transpose(X,-5) ) ,-7) +transpose(transpose(arpeggio(X) ,-5) ,12) ) ,-5) ,4) +transpose((arpeggio(transpose(echo((arpeggio(X) |transpose(step(X,12) ,-7) ) ,4,6) ,-5) ) +transpose(arpeggio((arpeggio(X) +transpose((X+X) ,-5) ) ) ,12) ) ,12) ) ,12) ) ) ) ,7) ) ,12) ) ,-7) ) ,-5) ,4,6)
random seed used was 0

NOTE: Generated phrase was too large ( 8760 ) , it has been truncated at 5000 notes. EXPR = ((transpose(echo(transpose((((shuffle((step(X,12) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ) +transpose((arpeggio(transpose(step(transpose(echo(arpeggio(X) ,4,6) ,4) ,12) ,4) ) +(shuffle(((((transpose(transpose(X,-5) ,-5) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,12) ) +transpose(transpose((X+X) ,-5) ,7) ) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ) |((echo(X,4,6) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ) ) ,4) ) +transpose(step(transpose(step(transpose(transpose((X+arpeggio(X) ) ,-7) ,4) ,12) ,-5) ,12) ,4) ) +transpose(((shuffle(echo((transpose(echo(((shuffle(X) +transpose(shuffle(echo(X,4,6) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ,4) |transpose(transpose(X,-7) ,4) ) ,4,6) ) |((shuffle(transpose(echo((X+X) ,4,6) ,4) ) |((transpose(transpose(X,4) ,-5) +transpose(transpose(echo(step(X,12) ,4,6) ,4) ,4) ) +transpose(((((X+transpose(X,7) ) +(X+X) ) +transpose((transpose(X,-7) |transpose(X,-5) ) ,4) ) +transpose(transpose(((X+X) |arpeggio(X) ) ,-5) ,7) ) ,7) ) ) |(((transpose(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) |arpeggio(echo(X,4,6) ) ) +transpose(transpose(echo(step(X,12) ,4,6) ,4) ,12) ) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ) ) +transpose(arpeggio(transpose(transpose(arpeggio((echo((X+transpose(X,12) ) ,4,6) |((shuffle(X) |transpose((X|X) ,-5) ) +echo(X,4,6) ) ) ) ,-7) ,-5) ) ,7) ) ,7) ) ,-7) ,4,6) ,-5) +transpose(arpeggio(transpose(shuffle(transpose((step(shuffle(arpeggio(step(arpeggio(step(X,12) ) ,12) ) ) ,12) +(shuffle((((((transpose(step(step(X,12) ,12) ,-7) +(transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ) +transpose(((X+transpose((X+transpose(X,12) ) ,12) ) +echo(((transpose(X,-5) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) ,4,6) ) ,7) ) +echo(step(echo((echo(step((X+transpose(X,12) ) ,12) ,4,6) |(X|(X|X) ) ) ,4,6) ,12) ,4,6) ) +transpose(arpeggio((step(arpeggio((transpose(shuffle(X) ,-7) |echo(X,4,6) ) ) ,12) +transpose(arpeggio(transpose((((X+X) +step(X,12) ) +transpose(((X+transpose(X,7) ) |transpose(transpose(X,-5) ,-5) ) ,7) ) ,-7) ) ,7) ) ) ,4) ) +transpose(((echo(echo(step(echo(X,4,6) ,12) ,4,6) ,4,6) +transpose(transpose(shuffle(echo(((X+transpose(X,12) ) +(X+X) ) ,4,6) ) ,-5) ,12) ) |step(((X+arpeggio(X) ) |arpeggio(X) ) ,12) ) ,7) ) ) |(step(step((step(transpose((((X|X) +echo(shuffle(X) ,4,6) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,-5) ,12) +transpose(transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,7) ) ,12) ,12) +transpose(arpeggio(arpeggio((transpose(transpose(X,-5) ,4) +transpose((step(X,12) |shuffle(X) ) ,7) ) ) ) ,7) ) ) ) ,-7) ) ,-7) ) ,12) ) |(step((echo((shuffle((echo((arpeggio((step(X,12) |(((X+X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ) |transpose(step(transpose((X|X) ,4) ,12) ,-7) ) ,4,6) |echo(transpose(step(arpeggio(echo(echo(((X+step(X,12) ) +transpose(X,-5) ) ,4,6) ,4,6) ) ,12) ,-5) ,4,6) ) ) |echo(step(step(shuffle(transpose(shuffle(transpose(X,-5) ) ,-7) ) ,12) ,12) ,4,6) ) ,4,6) +echo(transpose((transpose(echo(X,4,6) ,4) +arpeggio(((X+X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,4) ,4,6) ) ,12) +(((echo((((arpeggio(transpose(echo(transpose(((shuffle(X) +step(X,12) ) +step(transpose(X,-7) ,12) ) ,4) ,4,6) ,4) ) +transpose(transpose(transpose(step(step((echo(step(shuffle(arpeggio(X) ) ,12) ,4,6) +transpose(step(transpose(X,-7) ,12) ,12) ) ,12) ,12) ,4) ,4) ,4) ) +transpose(shuffle(shuffle((shuffle(step(((transpose((X+transpose(X,7) ) ,4) |transpose(X,-5) ) +transpose(((X+X) |transpose(shuffle(X) ,-7) ) ,7) ) ,12) ) +transpose(shuffle(((transpose(((X+transpose(X,12) ) +arpeggio(arpeggio(X) ) ) ,-5) +transpose(((echo(X,4,6) +transpose((X+arpeggio(X) ) ,4) ) +transpose((transpose(X,-7) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,7) ) ,4) ) +transpose(transpose((step(X,12) |transpose(echo(X,4,6) ,4) ) ,4) ,7) ) ) ,7) ) ) ) ,7) ) +echo(arpeggio((step(step(X,12) ,12) |step(X,12) ) ) ,4,6) ) ,4,6) +transpose(((transpose(echo(transpose(transpose(echo(transpose(X,-7) ,4,6) ,4) ,-7) ,4,6) ,-7) +transpose((step((transpose(((echo(((X+X) +transpose(X,12) ) ,4,6) +transpose(((transpose(step(arpeggio((X|X) ) ,12) ,-7) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(((shuffle(((X|X) |(X|X) ) ) +transpose(arpeggio(shuffle(X) ) ,7) ) +transpose(X,12) ) ,7) ) ,-7) |echo((shuffle(step(shuffle(X) ,12) ) +(transpose(transpose((echo(X,4,6) +transpose(X,12) ) ,-5) ,4) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) ) ,4,6) ) ,12) +transpose(((transpose(echo((shuffle(X) |(X+X) ) ,4,6) ,-5) +transpose(transpose(shuffle(transpose(step((X+transpose(X,7) ) ,12) ,-5) ) ,4) ,12) ) |((shuffle(((echo(X,4,6) +transpose((X|X) ,12) ) |transpose(((shuffle(X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ) ) +transpose((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +step(step((transpose(X,-5) +transpose(X,7) ) ,12) ,12) ) ,7) ) +transpose(transpose(arpeggio(step((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |transpose(X,4) ) ,12) ) ,4) ,12) ) ) ,7) ) ,7) ) |(((transpose((X|X) ,4) +transpose(transpose(arpeggio(X) ,4) ,12) ) +shuffle(arpeggio(step((arpeggio(X) +transpose((X+X) ,7) ) ,12) ) ) ) +transpose((((transpose(arpeggio((X+transpose(echo(X,4,6) ,12) ) ) ,4) +transpose(((echo(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4,6) +transpose((X+X) ,12) ) +echo(transpose((arpeggio(X) +X) ,-5) ,4,6) ) ,4) ) +transpose((step((echo(X,4,6) +transpose(X,12) ) ,12) +transpose(step(arpeggio(((echo(arpeggio(X) ,4,6) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose(((((X|X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) |(X+X) ) ,7) ) ) ,12) ,12) ) ,7) ) +((step(X,12) |arpeggio(X) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) ) ) ,4) ) +transpose(((step(transpose((shuffle(echo((X+X) ,4,6) ) +transpose((shuffle(X) +transpose((X|transpose(echo(X,4,6) ,-5) ) ,12) ) ,7) ) ,4) ,12) +transpose(transpose(transpose(step(echo(transpose((X+shuffle(X) ) ,-7) ,4,6) ,12) ,-7) ,-5) ,4) ) +transpose(transpose(arpeggio((((((transpose(X,-7) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +arpeggio(X) ) |transpose(transpose(X,4) ,-5) ) +(echo(step(echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) ,12) ,4,6) |(shuffle(step(arpeggio(X) ,12) ) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) |step(X,12) ) ,7) ) ) ) ) ,-7) ,7) ) ,7) ) +transpose(shuffle(shuffle(step(shuffle(shuffle(step(arpeggio(shuffle(((echo(X,4,6) |(X+step(X,12) ) ) |arpeggio(transpose(echo(X,4,6) ,4) ) ) ) ) ,12) ) ) ,12) ) ) ,12) ) ) )
random seed used was 0

NOTE: Generated phrase was too large ( 18888 ) , it has been truncated at 5000 notes.


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