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:
 Seed: Randomize seed: Generations: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Phrase for X: Basic 1 - c,e,gBasic 2 - c,g,e,b-Basic 3 - c,gBasic 4 - cBasic 5 - co3,co4,co3,co2Chord 1 - c e gChord 2 - c e- gChord 3 - c e- g b-Chord 4 - c f gFile 1 - bachinv1.midFile 2 - bachinv2.midFile 3 - bachinv3.midFile 4 - bachinv4.midFile 5 - bachinv5.midFile 6 - bachinv6.midFile 7 - bachinv7.midFile 8 - bachinv8.mid # of Tracks: 1234 Randomize patches: noyes Results may not appear for a few seconds.Be patient!
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 After 20 generations the expression "X" became this: arpeggio(shuffle(transpose((echo((shuffle((transpose(arpeggio(transpose(transpose(transpose(echo((echo(step(shuffle(X) ,12) ,4,6) +transpose(((X+transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,7) ) ,7) ) ,4,6) ,4) ,-7) ,-5) ) ,-7) |transpose(step(arpeggio(((step((X+transpose(X,7) ) ,12) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,4) ) +transpose(((((X|X) +X) +transpose(echo(arpeggio(X) ,4,6) ,7) ) +transpose((X|transpose(X,4) ) ,7) ) ,7) ) ) ,12) ,-5) ) ) +transpose((arpeggio(((arpeggio((transpose(shuffle(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-5) ) ,-7) |shuffle(((step(step((X|X) ,12) ,12) +transpose(echo(((arpeggio(X) +transpose(step((X+transpose(X,7) ) ,12) ,4) ) +transpose(X,7) ) ,4,6) ,7) ) +transpose(transpose(transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,-7) ,-7) ,7) ) ) ) ) +step(echo((echo(X,4,6) +step(X,12) ) ,4,6) ,12) ) |step(((arpeggio(transpose(arpeggio(echo(X,4,6) ) ,-5) ) +transpose(transpose(transpose(step(echo(transpose(X,4) ,4,6) ,12) ,4) ,-7) ,7) ) |((echo((X|transpose((X+transpose(X,7) ) ,4) ) ,4,6) +transpose(echo(shuffle(step(transpose(echo(X,4,6) ,4) ,12) ) ,4,6) ,7) ) +transpose(((step(echo(echo((transpose(X,-5) +transpose(X,7) ) ,4,6) ,4,6) ,12) +transpose(step(((shuffle(shuffle((X+X) ) ) +transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ,12) ,4) ) +transpose((((echo(transpose(X,-5) ,4,6) +transpose(X,12) ) +transpose((X|echo(transpose(X,4) ,4,6) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,7) ) ,7) ) ) ,12) ) ) +transpose((((step(transpose((((step(transpose(transpose(shuffle(step(X,12) ) ,-5) ,-5) ,12) |transpose(arpeggio(transpose(X,4) ) ,-5) ) |shuffle(echo(echo(transpose(arpeggio(X) ,4) ,4,6) ,4,6) ) ) |(transpose(arpeggio((shuffle(X) |X) ) ,-5) +transpose(echo(((((arpeggio(X) +transpose(transpose(X,-5) ,4) ) +transpose((shuffle(X) +transpose(step(X,12) ,7) ) ,7) ) +transpose(X,4) ) +(arpeggio(X) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ) ,4,6) ,7) ) ) ,4) ,12) |transpose(shuffle(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) ,-7) ) +transpose(arpeggio(echo(arpeggio(step((((transpose((step(X,12) +transpose((X+X) ,7) ) ,-5) +transpose(echo(X,4,6) ,7) ) |shuffle(X) ) +transpose((shuffle(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ) +transpose(transpose((((X+transpose(echo(X,4,6) ,4) ) +transpose(step(X,12) ,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,4) ,12) ) ,12) ) ,12) ) ,4,6) ) ,4) ) +transpose(echo(transpose(((arpeggio(echo(arpeggio(transpose(X,-5) ) ,4,6) ) |shuffle((transpose(transpose(X,-5) ,-5) +((((transpose(X,-5) +(X+X) ) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) |arpeggio((X|X) ) ) ) ) ) +transpose((echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) +transpose(echo(((transpose(shuffle(X) ,4) |(shuffle(transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,4,6) ,7) ) ,7) ) ,4) ,4,6) ,7) ) ,12) ) ,12) ) ,4,6) +transpose((((echo(((transpose(((arpeggio(echo(X,4,6) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) |step((X+transpose(X,12) ) ,12) ) ,-7) +arpeggio(arpeggio(((echo(transpose(shuffle(X) ,-5) ,4,6) +transpose(((((X+transpose(X,7) ) +transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose((echo(X,4,6) +X) ,7) ) ) ) ) +transpose((step(step(echo(step((shuffle(X) |X) ,12) ,4,6) ,12) ,12) +transpose(echo(echo(transpose(shuffle(transpose(X,4) ) ,-5) ,4,6) ,4,6) ,12) ) ,7) ) ,4,6) +transpose((shuffle(transpose((((shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose((X+transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(echo(X,4,6) ,12) ) ,7) ) ,7) ) +transpose(step(arpeggio(transpose(step(X,12) ,-5) ) ,12) ,7) ) ,-7) ) +transpose(arpeggio(arpeggio(step((X|X) ,12) ) ) ,12) ) ,4) ) +transpose(((transpose(arpeggio(shuffle(echo((step(X,12) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,4,6) ) ) ,4) +transpose(transpose(echo(step(step(((transpose(transpose(arpeggio(X) ,4) ,-5) +transpose((transpose((X+transpose(X,12) ) ,-5) |arpeggio(((X|X) +transpose(X,7) ) ) ) ,4) ) +transpose(transpose((shuffle(X) +X) ,-7) ,7) ) ,12) ,12) ,4,6) ,-5) ,4) ) +transpose(transpose(((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) |transpose(echo(X,4,6) ,-5) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose((transpose((X+transpose(X,7) ) ,4) +transpose(((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(transpose(arpeggio(arpeggio(X) ) ,4) ,-5) ,7) ) ,7) ) ,7) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,12) ) ,4) ,7) ) ,7) ) +((((transpose((transpose(((X+transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ,-5) +(transpose(transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4) ,-7) +transpose(transpose(shuffle(echo(X,4,6) ) ,4) ,7) ) ) ,4) +transpose(transpose((transpose((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) |(((shuffle(echo(X,4,6) ) +transpose(((echo(X,4,6) +transpose(((X+X) +transpose(X,7) ) ,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) ,4) ) +transpose(((step((X+transpose(X,7) ) ,12) +transpose((transpose(X,-5) +transpose(X,7) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,7) ) +(echo(X,4,6) +transpose((X|X) ,7) ) ) ) ,-7) ,7) ) +transpose(((transpose((X+transpose(X,7) ) ,-7) +step(shuffle((X+X) ) ,12) ) +echo(step(((X|X) +transpose((X+transpose(X,12) ) ,7) ) ,12) ,4,6) ) ,7) ) +transpose(step(((((echo(transpose(echo(transpose(X,4) ,4,6) ,4) ,4,6) +transpose(transpose(transpose((shuffle(X) +transpose(transpose(((X+transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) ,-7) ,12) ) ,-5) ,4) ,7) ) +((transpose(echo(shuffle((((X+X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4,6) ,4) +transpose(arpeggio(transpose(X,-7) ) ,4) ) +transpose(transpose(echo(step(X,12) ,4,6) ,-5) ,7) ) ) |(echo(transpose((step(step((X|X) ,12) ,12) +transpose(X,7) ) ,4) ,4,6) +shuffle(transpose(arpeggio(echo((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ) ,4) ) ) ) |shuffle((arpeggio((X+transpose(X,12) ) ) |((echo((shuffle(X) |transpose(X,-5) ) ,4,6) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose((shuffle(shuffle(X) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ) ) ,12) ,4) ) +transpose(transpose(transpose(echo((shuffle(((arpeggio(X) +transpose(X,12) ) +transpose(arpeggio((transpose(X,-5) +X) ) ,12) ) ) |echo((echo(arpeggio(X) ,4,6) +transpose(step(transpose(X,-7) ,12) ,12) ) ,4,6) ) ,4,6) ,-7) ,4) ,7) ) ) ,7) ) ,4) ) ) random seed used was 177436589 EXPR = (((echo(step(transpose(arpeggio(arpeggio((shuffle((transpose(arpeggio(X) ,-7) |(((((step(X,12) +transpose(X,-5) ) +transpose((step(X,12) +transpose(X,4) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose((X+shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) ) ) ,7) ) ,12) ) ) ) +transpose(transpose(((arpeggio(echo(shuffle(step((X+transpose(X,7) ) ,12) ) ,4,6) ) +transpose((echo((X+transpose(X,12) ) ,4,6) +transpose(shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose((step(X,12) +transpose(X,7) ) ,7) ) ) ,7) ) ,-7) ) +transpose(step((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) ,12) ,-7) ) ,4) ,12) ) ) ) ,-5) ,12) ,4,6) +transpose(echo((transpose(((transpose((((echo(X,4,6) +transpose(((X+transpose(X,7) ) +X) ,12) ) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) ,4) +transpose(transpose(arpeggio(echo(X,4,6) ) ,4) ,7) ) +transpose(((transpose(step(((shuffle((X+transpose(X,7) ) ) +transpose(arpeggio(X) ,12) ) +transpose(transpose(echo(shuffle(X) ,4,6) ,4) ,7) ) ,12) ,-5) +transpose((step(echo(((step(X,12) +transpose(X,4) ) +transpose((X+X) ,7) ) ,4,6) ,12) |((echo(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ,4,6) +((((X+transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose(shuffle(step(X,12) ) ,7) ) ) +transpose(((echo(echo(transpose(arpeggio(X) ,-5) ,4,6) ,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(echo(step(step(X,12) ,12) ,4,6) ,7) ) ,7) ) ) ,7) ) +transpose(arpeggio(echo(((shuffle(step(X,12) ) +transpose(shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) +((X+transpose(X,7) ) |X) ) ) ,4) ) +transpose(step((shuffle(X) +transpose(shuffle(X) ,12) ) ,12) ,7) ) ,4,6) ) ,7) ) ,7) ) ,4) +transpose(echo(transpose(transpose(echo((transpose((((X+transpose(X,7) ) |(X+transpose(X,12) ) ) +X) ,-5) +transpose(((arpeggio((((X+X) +transpose((X|(X+transpose(X,12) ) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) +transpose(step(arpeggio(((X+X) +(step(X,12) +transpose(X,7) ) ) ) ,12) ,4) ) +transpose((((arpeggio(X) +step(X,12) ) +transpose((arpeggio(transpose(X,-5) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,4) ) +transpose(arpeggio(((X|X) +transpose(X,-5) ) ) ,7) ) ,7) ) ,12) ) ,4,6) ,4) ,-5) ,4,6) ,-5) ) ,4,6) ,4) ) +transpose((transpose(((((transpose((step(arpeggio(X) ,12) +transpose(echo(transpose((arpeggio(X) +transpose((X+X) ,7) ) ,4) ,4,6) ,7) ) ,4) +transpose(((((((X|X) +shuffle(X) ) +transpose(step((((transpose(X,-5) +transpose(((X+X) +transpose((X|X) ,7) ) ,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(transpose(X,-7) ,12) ,4) ) +transpose(((step(X,12) +transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ,12) ) +((transpose(((transpose(X,4) +transpose((arpeggio(X) +transpose(X,12) ) ,7) ) +(transpose(X,-5) +transpose(X,7) ) ) ,-7) +transpose(shuffle((((arpeggio(arpeggio(step(X,12) ) ) +transpose((X+step(X,12) ) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) +transpose((((step(X,12) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +X) ,7) ) ) ,4) ) +transpose(transpose(arpeggio(step(step(X,12) ,12) ) ,-5) ,7) ) ) +transpose((((((transpose((X+transpose(X,7) ) ,4) +transpose(((arpeggio(X) +transpose((X+arpeggio(X) ) ,7) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) +transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,7) ) ,-7) ) +transpose(((((transpose(X,-5) +transpose(echo(X,4,6) ,12) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(transpose(echo(step(X,12) ,4,6) ,4) ,7) ) ,7) ) |arpeggio(transpose(((transpose(transpose(X,-7) ,4) +transpose(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) +transpose(arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,7) ) ,-5) ) ) ,4) ) +transpose(shuffle((echo(echo((((X+transpose(X,7) ) +(X+X) ) +transpose(X,7) ) ,4,6) ,4,6) +transpose((step((echo(shuffle(X) ,4,6) |transpose(X,-7) ) ,12) +transpose((shuffle(shuffle(echo(X,4,6) ) ) +(X|(X+transpose(X,7) ) ) ) ,7) ) ,12) ) ) ,7) ) ,12) ) +transpose((arpeggio(transpose((echo(arpeggio(step(X,12) ) ,4,6) +transpose(arpeggio(X) ,7) ) ,-5) ) +transpose((((echo((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) |X) ,4,6) |transpose(shuffle(transpose(step(X,12) ,-5) ) ,-7) ) +transpose(echo(shuffle(step(X,12) ) ,4,6) ,7) ) +transpose(((((shuffle(echo(X,4,6) ) +transpose(echo(transpose((X+transpose(X,7) ) ,4) ,4,6) ,7) ) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose((shuffle(X) +echo(transpose(X,-7) ,4,6) ) ,7) ) +transpose((step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) |arpeggio(step(step(shuffle(X) ,12) ,12) ) ) ,7) ) ,12) ) ,7) ) ,12) ) +transpose(arpeggio((((step(((shuffle(step((((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(((transpose(X,-5) +transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,12) ) +transpose(((echo(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |X) ,4,6) +transpose(step(step(X,12) ,12) ,7) ) +transpose(transpose(((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((((X|X) +transpose((X|X) ,4) ) +transpose(X,7) ) ,12) ) ,-7) ,7) ) ,4) ) +transpose((transpose((echo((X+X) ,4,6) +((X+transpose(X,7) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ) ,4) +transpose(transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,-7) ,12) ) ,7) ) ,12) +transpose((shuffle(shuffle(transpose(echo((echo((echo(X,4,6) +arpeggio(X) ) ,4,6) |((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ) ,4,6) ,4) ) ) +transpose(transpose((transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,-5) |step((X|X) ,12) ) ,-5) +echo(transpose((echo(X,4,6) +transpose((arpeggio(X) |(X|X) ) ,7) ) ,-5) ,4,6) ) ,-5) ,12) ) ,12) ) +transpose(((((transpose((((arpeggio(step(X,12) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) |step(transpose(arpeggio((X+transpose(X,7) ) ) ,-7) ,12) ) ,4) |arpeggio(transpose(transpose(transpose(X,-7) ,-5) ,4) ) ) +transpose(shuffle(step(transpose((X+transpose(X,12) ) ,4) ,12) ) ,12) ) +transpose(echo((transpose((echo((X+X) ,4,6) +transpose(transpose((X|X) ,4) ,7) ) ,-7) +transpose(echo((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(step((X+X) ,12) |((shuffle(X) +transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) ) ) ,-5) +transpose(transpose((echo((((X+transpose(X,4) ) +transpose(X,7) ) |arpeggio(X) ) ,4,6) +transpose(echo(X,4,6) ,7) ) ,4) ,7) ) ,4,6) ,7) ) ,4,6) ,4) ) +transpose(arpeggio(shuffle(shuffle(arpeggio(shuffle(X) ) ) ) ) ,7) ) ,4) ) +transpose(echo(transpose(echo((echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((arpeggio(X) |(((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,4) ) ) |((echo(X,4,6) +X) +transpose(((shuffle(X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,12) ) ) ,7) ) ,4,6) +shuffle(((transpose(arpeggio(X) ,-5) +transpose((transpose(echo(X,4,6) ,-7) +X) ,4) ) +transpose(shuffle(transpose((X+transpose(X,12) ) ,4) ) ,7) ) ) ) ,4,6) ,-5) ,4,6) ,7) ) ) ,4) ) +transpose((step(((arpeggio(transpose((shuffle((X+transpose(X,7) ) ) +transpose(transpose((arpeggio(X) +transpose(X,7) ) ,4) ,12) ) ,-7) ) +(transpose(echo(transpose(X,-7) ,4,6) ,4) |arpeggio(shuffle(X) ) ) ) +transpose(echo(step((step(((X|X) |X) ,12) +transpose(shuffle(((X+transpose(((X+transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,12) ) ,12) ,4,6) ,7) ) ,12) |arpeggio(step((((echo(X,4,6) |(X+X) ) +transpose(echo(transpose(transpose(X,4) ,-7) ,4,6) ,12) ) +transpose(transpose(step(transpose(shuffle(X) ,-5) ,12) ,-7) ,7) ) ,12) ) ) ,7) ) ,4) |step(arpeggio((echo(transpose(((transpose(X,-5) +transpose(echo(X,4,6) ,4) ) +transpose(((arpeggio(X) |echo(X,4,6) ) +transpose(X,7) ) ,7) ) ,-7) ,4,6) +echo(shuffle((arpeggio((((transpose(X,-7) +(X+X) ) +transpose(step(step(X,12) ,12) ,12) ) +transpose((echo(shuffle(X) ,4,6) +transpose(step(X,12) ,7) ) ,7) ) ) +((((X+X) +transpose(shuffle(X) ,7) ) |transpose(X,4) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) ) ) ,4,6) ) ) ,12) ) ,7) ) +transpose(shuffle(transpose(arpeggio(shuffle(transpose(arpeggio((step(transpose(shuffle(transpose(step(X,12) ,-7) ) ,4) ,12) +transpose(((((transpose(arpeggio(transpose(X,4) ) ,-7) |(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) |X) ) +transpose((transpose(arpeggio((X+X) ) ,-5) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(((echo((X+X) ,4,6) |((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X|arpeggio(X) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) |(step(((shuffle(X) +transpose(step(X,12) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ,12) +transpose((transpose((arpeggio(X) +X) ,-7) |(shuffle(arpeggio(transpose(X,4) ) ) +transpose(X,7) ) ) ,7) ) ) ,7) ) ,7) ) ) ,-7) ) ) ,-7) ) ,7) ) random seed used was 0 NOTE: Generated phrase was too large ( 8200 ) , it has been truncated at 5000 notes. EXPR = step(arpeggio(((transpose(step(arpeggio(((transpose(((step(((shuffle((((X+X) |transpose(X,-5) ) +transpose(transpose(X,-5) ,12) ) ) +transpose(echo(X,4,6) ,4) ) +transpose((echo(transpose((X+transpose(X,7) ) ,4) ,4,6) +transpose(shuffle(echo(arpeggio(X) ,4,6) ) ,7) ) ,7) ) ,12) +transpose(echo(((transpose((X+transpose(X,7) ) ,4) +transpose(((transpose(transpose(X,-7) ,-5) +transpose((transpose(transpose(X,-7) ,-5) +transpose(step(X,12) ,12) ) ,7) ) +(((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((((X+transpose(X,12) ) +transpose((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(((echo(X,4,6) +(X|X) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose(echo(step(shuffle((X+transpose(X,7) ) ) ,12) ,4,6) ,7) ) ,4,6) ,7) ) |(((echo((transpose((arpeggio(X) +transpose(echo(X,4,6) ,12) ) ,-5) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,12) ) ,4,6) +transpose(arpeggio(((echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4,6) +transpose(transpose((arpeggio(X) +(X+transpose(X,7) ) ) ,-7) ,4) ) +transpose(((step(X,12) +X) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ) ,7) ) +transpose(transpose(transpose((((step(X,12) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(echo(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,-5) ,-7) ,4) ) +transpose(shuffle(transpose(transpose(((transpose(X,4) +transpose(step(X,12) ,7) ) +transpose(X,7) ) ,-5) ,4) ) ,7) ) ) ,4) +transpose(transpose((((((((X+transpose(X,12) ) +transpose((arpeggio((X|X) ) |transpose(step(X,12) ,-5) ) ,7) ) +transpose(transpose(step(X,12) ,-7) ,4) ) +transpose(step((transpose(arpeggio(X) ,-5) |transpose(transpose(X,-7) ,-5) ) ,12) ,7) ) +transpose((shuffle(step(X,12) ) |transpose(X,-7) ) ,-5) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) |((step(arpeggio(transpose(((((X+transpose(X,12) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-7) ,7) ) +shuffle(X) ) ,4) ) ,12) +transpose(transpose(transpose(step(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ,12) ,-5) ,-5) ,4) ) +transpose((((step(shuffle(X) ,12) +transpose(echo(step(transpose(X,4) ,12) ,4,6) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) +transpose(step((step(X,12) |((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ) ,12) ,7) ) ,7) ) ) ,4) ,4) ) +transpose(arpeggio(step(((transpose(shuffle(arpeggio(((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ) ,4) +transpose(((step(step(((X+transpose(X,7) ) +transpose(X,4) ) ,12) ,12) +transpose((step((X+X) ,12) |(shuffle(X) +transpose(transpose(X,-7) ,12) ) ) ,4) ) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4) ) +transpose(shuffle(shuffle(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,7) ) ,12) ) ,7) ) ) ,12) ,-5) +transpose(transpose(shuffle(step(arpeggio(((transpose(transpose(arpeggio(transpose(transpose(transpose(transpose(transpose(X,4) ,-5) ,4) ,-7) ,4) ) ,-7) ,-5) |(shuffle(echo(echo(shuffle(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,4,6) ,4,6) ) +transpose(echo((transpose((X+X) ,4) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,-5) ) ,7) ) ,4,6) ,12) ) ) +transpose(shuffle((shuffle(arpeggio(((X+transpose(X,-5) ) +transpose((X+transpose(X,4) ) ,12) ) ) ) +transpose(transpose((((X+transpose(X,12) ) |transpose(X,-5) ) +echo(step((X+transpose(X,7) ) ,12) ,4,6) ) ,-5) ,7) ) ) ,12) ) ) ,12) ) ,-7) ,7) ) +transpose(step((transpose((((((((arpeggio((transpose(X,4) +(X+X) ) ) +transpose((shuffle(X) |(((X+transpose(X,4) ) +transpose(X,7) ) |arpeggio(X) ) ) ,7) ) +(transpose(echo(echo(shuffle(X) ,4,6) ,4,6) ,-7) |transpose(arpeggio(echo(X,4,6) ) ,-7) ) ) +step((((((arpeggio(X) +transpose(shuffle(shuffle(X) ) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,7) ) |X) +transpose((echo(X,4,6) |transpose((((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,7) ) ,-5) ) ,4) ) +transpose((((X+(X|X) ) +(X+transpose(transpose(X,-7) ,12) ) ) +arpeggio(step(X,12) ) ) ,7) ) ,12) ) +transpose(((step(((arpeggio(arpeggio(transpose(X,4) ) ) +transpose(shuffle(transpose((X|X) ,-5) ) ,4) ) +transpose((step(X,12) +transpose(transpose(X,-5) ,7) ) ,7) ) ,12) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) +transpose(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) |echo(((echo((X|((X+transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4,6) +transpose((step((X|X) ,12) +shuffle((X|X) ) ) ,4) ) +transpose(shuffle((((echo(X,4,6) |(X+X) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ,4,6) ) ,4) ) +transpose((echo(transpose((arpeggio(X) +transpose((shuffle(transpose(X,-7) ) +shuffle(X) ) ,7) ) ,-5) ,4,6) |arpeggio(transpose((transpose(step(X,12) ,-5) +transpose(transpose(X,-5) ,7) ) ,-7) ) ) ,7) ) ,4) ) +transpose(shuffle((transpose(transpose(shuffle(echo(transpose(X,-7) ,4,6) ) ,-7) ,-5) +transpose(((arpeggio(X) |((step(X,12) +transpose((step(X,12) +transpose(shuffle(X) ,12) ) ,4) ) +transpose((transpose(X,-5) +transpose(X,7) ) ,7) ) ) +transpose(transpose((((((X+transpose(X,12) ) +transpose(((X+X) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(((X+X) |echo(X,4,6) ) ,4) ) +transpose(((shuffle(shuffle(X) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,7) ) ,4) ,7) ) ,7) ) ) ,7) ) |((transpose(shuffle(arpeggio((((((X+X) +transpose(shuffle(X) ,7) ) +transpose(echo(X,4,6) ,7) ) +transpose(echo((arpeggio(X) +transpose(X,12) ) ,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) ,-7) +transpose(arpeggio(transpose(arpeggio(transpose(shuffle((X+transpose(X,7) ) ) ,-5) ) ,4) ) ,4) ) +transpose(echo((transpose((X+transpose(X,7) ) ,4) +echo(X,4,6) ) ,4,6) ,7) ) ) +transpose((((echo(echo(((arpeggio(arpeggio(echo((X+echo(X,4,6) ) ,4,6) ) ) +transpose(((transpose((transpose(shuffle(X) ,4) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,-7) +transpose(step(X,12) ,4) ) +transpose(echo(shuffle(shuffle(X) ) ,4,6) ,7) ) ,7) ) +step((transpose(step(X,12) ,4) |(X+X) ) ,12) ) ,4,6) ,4,6) +transpose((arpeggio(arpeggio((((X|X) +transpose(arpeggio(X) ,7) ) +(step(X,12) +shuffle(X) ) ) ) ) +transpose(arpeggio((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X+(X+transpose(X,12) ) ) ,7) ) ) ,12) ) ,4) ) +transpose(transpose(echo(arpeggio(transpose(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ,-7) ) ,4,6) ,4) ,7) ) |((transpose(transpose((((X+transpose(X,12) ) |shuffle(X) ) |((arpeggio(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) ,-5) ,4) +transpose((shuffle((transpose(X,4) +transpose(((((step(X,12) +X) +transpose(arpeggio(shuffle(X) ) ,4) ) +transpose(((X+X) |shuffle(X) ) ,7) ) |(echo(X,4,6) +transpose(echo(X,4,6) ,7) ) ) ,7) ) ) +step((shuffle(echo(X,4,6) ) +transpose(((transpose(arpeggio(X) ,4) +transpose(transpose((X+X) ,4) ,4) ) +transpose((((X+transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(step(X,12) ,7) ) ,7) ) ,7) ) ,12) ) ,4) ) +transpose(echo(((step(((shuffle(arpeggio(X) ) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) +transpose(echo(transpose(shuffle(arpeggio(X) ) ,-7) ,4,6) ,4) ) +transpose(transpose(echo(step((X|X) ,12) ,4,6) ,4) ,7) ) ,4,6) ,7) ) ) ,12) ) ,-5) |transpose(((transpose(shuffle(arpeggio(((step((X|step(X,12) ) ,12) +transpose(arpeggio(transpose(echo(X,4,6) ,-5) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) ,-5) +transpose((arpeggio(transpose(transpose(arpeggio(((step(X,12) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ) ,-5) ,-5) ) |transpose(echo(((shuffle(step(X,12) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) +transpose(((arpeggio(arpeggio(X) ) +transpose(transpose(((arpeggio(X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose((X+X) ,7) ) ,7) ) ,4,6) ,-5) ) ,4) ) +transpose(transpose((shuffle(transpose(arpeggio((echo(X,4,6) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ) ,-5) ) +transpose(((step(echo((step(X,12) +transpose(((step(X,12) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,7) ) ,4,6) ,12) +transpose(shuffle(transpose((((step(X,12) +transpose(arpeggio(X) ,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,-7) ) ,4) ) +transpose(((((step(shuffle(X) ,12) +(X|X) ) +transpose((arpeggio(X) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,7) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) +transpose(step((echo((X+transpose(transpose(X,-5) ,7) ) ,4,6) +transpose(X,7) ) ,12) ,12) ) ,7) ) ,12) ) ,-5) ,7) ) ,4) ) ,12) ,12) ) ) ,12) random seed used was 0 EXPR = arpeggio(echo(echo((shuffle((((((echo(((X+transpose(shuffle(transpose(X,4) ) ,7) ) +transpose(((transpose((X+transpose(X,7) ) ,4) |((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose((X|X) ,7) ) ) +arpeggio(echo(X,4,6) ) ) ,7) ) ,4,6) +transpose(echo(((echo(X,4,6) +transpose(transpose((X|X) ,4) ,4) ) +transpose(((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ,7) ) ,4,6) ,4) ) +transpose((((((X+transpose(X,7) ) |arpeggio(X) ) +transpose((echo(shuffle(X) ,4,6) +transpose((shuffle(X) +transpose(X,4) ) ,7) ) ,4) ) +transpose(arpeggio(shuffle(arpeggio(X) ) ) ,7) ) +transpose((arpeggio(X) +transpose(step(transpose(step(X,12) ,-5) ,12) ,7) ) ,12) ) ,7) ) +step((shuffle(arpeggio(((X|X) +X) ) ) +transpose((((((transpose((X+transpose(X,7) ) ,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo((X|X) ,4,6) ,7) ) +arpeggio(transpose(arpeggio(X) ,-5) ) ) +transpose(shuffle(transpose(step(X,12) ,4) ) ,4) ) +transpose((X|(transpose(arpeggio((X+transpose(X,12) ) ) ,4) +transpose(X,4) ) ) ,7) ) ,12) ) ,12) ) +transpose(echo(transpose((arpeggio(arpeggio(step(echo(shuffle(echo(X,4,6) ) ,4,6) ,12) ) ) +transpose(((transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ,-7) +transpose(echo(arpeggio(((arpeggio(X) +transpose(echo(X,4,6) ,12) ) +transpose(step(X,12) ,7) ) ) ,4,6) ,12) ) +transpose(step(echo((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4,6) ,12) ,7) ) ,7) ) ,4) ,4,6) ,4) ) +transpose(((step((transpose((X+transpose((transpose(X,-5) +step(X,12) ) ,7) ) ,-5) +transpose(echo(step(transpose(X,4) ,12) ,4,6) ,12) ) ,12) +arpeggio(arpeggio((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ) +transpose(transpose(arpeggio(transpose(transpose(shuffle(((step((X+transpose(X,12) ) ,12) +transpose((X+transpose(X,7) ) ,7) ) +transpose(((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(arpeggio(X) ,12) ) ,7) ) ,7) ) ) ,4) ,4) ) ,-7) ,7) ) ,7) ) ) +arpeggio((((step(echo((((step(step(shuffle(X) ,12) ,12) +transpose(shuffle(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) ,4) ) +transpose(step((echo(X,4,6) +echo((X+transpose(X,7) ) ,4,6) ) ,12) ,7) ) |step(X,12) ) ,4,6) ,12) +transpose((((shuffle(transpose((transpose(X,4) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,-7) ) +transpose(((echo(arpeggio(X) ,4,6) +arpeggio((echo(X,4,6) +X) ) ) |transpose(transpose(echo(X,4,6) ,-5) ,-7) ) ,-7) ) +transpose(transpose((step((((transpose(X,4) +transpose((step(X,12) +transpose((arpeggio(X) |(X+transpose(X,7) ) ) ,12) ) ,7) ) +transpose(((echo(((X|X) +transpose(transpose(X,-5) ,7) ) ,4,6) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,4) ,4) ) +transpose((echo(X,4,6) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,7) ) ,7) ) |(arpeggio(step(X,12) ) +transpose(step(X,12) ,12) ) ) ,12) +echo(X,4,6) ) ,4) ,4) ) +transpose((transpose(step((transpose(arpeggio(X) ,-5) +echo(X,4,6) ) ,12) ,-5) +transpose(shuffle(step((step((X+transpose(X,7) ) ,12) +transpose(echo(X,4,6) ,7) ) ,12) ) ,7) ) ,7) ) ,7) ) +transpose(transpose(arpeggio(transpose(transpose(step(((transpose(X,-5) +transpose((X+X) ,7) ) |((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(shuffle(X) ,12) ) ) ,12) ,-5) ,-5) ) ,-5) ,4) ) +transpose(transpose(echo(arpeggio((((((transpose((X+transpose(X,7) ) ,-7) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,7) ) +transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,12) ,4) ) +transpose(shuffle(shuffle(step(echo(X,4,6) ,12) ) ) ,7) ) +transpose(arpeggio(shuffle((((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(step((X+X) ,12) ,12) ) +transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) ,4) ) +transpose(((shuffle(X) +transpose(transpose((((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) +transpose(transpose((step(X,12) |arpeggio(X) ) ,4) ,4) ) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose((X+(X+transpose(X,7) ) ) ,7) ) ,7) ) ,-5) ,4) ) +transpose((((transpose(step(echo(shuffle(X) ,4,6) ,12) ,-7) +transpose(arpeggio(X) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) +transpose(X,-7) ) ,7) ) ,7) ) ) ,4,6) ,4) ,7) ) ) ) ,4,6) ,4,6) ) random seed used was 0 NOTE: Generated phrase was too large ( 27775 ) , it has been truncated at 5000 notes.

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