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 19 generations the expression "X" became this: ((((transpose((((((transpose(transpose((X+X) ,4) ,-7) +step(((transpose(X,4) +transpose((X+(X+X) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) +((((arpeggio((X+transpose(X,12) ) ) |transpose(arpeggio(X) ,4) ) +transpose((shuffle(transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) +transpose((transpose((((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) |shuffle(X) ) ,4) +transpose(shuffle(X) ,12) ) ,7) ) ) +transpose(transpose(transpose(transpose((echo(transpose(transpose(X,-7) ,-5) ,4,6) |(((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((step(X,12) +transpose(arpeggio(X) ,12) ) ,12) ) ) ,-7) ,-7) ,-7) ,4) ) +transpose((shuffle((transpose(X,-5) +transpose((X+transpose((X+X) ,7) ) ,12) ) ) +echo(transpose(step(X,12) ,-7) ,4,6) ) ,7) ) +transpose((transpose(echo(transpose(transpose(((X+transpose(X,12) ) +transpose(X,-7) ) ,-7) ,-5) ,4,6) ,-7) +transpose(shuffle((transpose((((echo(transpose(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,4,6) +(((X|X) +(X+transpose(X,7) ) ) |transpose(X,-7) ) ) +transpose(transpose(echo(step(echo((X+transpose(X,12) ) ,4,6) ,12) ,4,6) ,4) ,12) ) +transpose((transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,-7) ,4) ,4) +transpose(transpose(X,4) ,12) ) ,7) ) ,4) +(echo(step(transpose((X+transpose(transpose(X,-5) ,12) ) ,4) ,12) ,4,6) +transpose(echo(step(((arpeggio(X) |(X|X) ) +(shuffle(X) +transpose(echo(X,4,6) ,12) ) ) ,12) ,4,6) ,12) ) ) ) ,12) ) ,12) ) ,-7) +transpose(transpose((transpose((transpose(((transpose((transpose(transpose(X,-7) ,-7) +(X|X) ) ,4) +transpose(step(X,12) ,12) ) +transpose(shuffle(transpose(transpose(X,4) ,4) ) ,-5) ) ,-5) +(transpose(transpose((((X|X) +X) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ,-7) |(transpose(echo(step(X,12) ,4,6) ,-7) +transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,7) ) ) ) ,4) +((shuffle(X) +transpose(((((transpose(shuffle((X+X) ) ,-7) +transpose(((X|X) +transpose(X,7) ) ,4) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose(X,4) ) ,12) ) +transpose(shuffle(transpose((transpose(X,4) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) ) ,-5) ) ,4) ) +transpose(((((arpeggio(transpose((X+X) ,4) ) +transpose((arpeggio((X+X) ) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) ,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) +shuffle(step((X+transpose((X+transpose(X,7) ) ,7) ) ,12) ) ) |transpose(transpose(transpose(echo(X,4,6) ,-5) ,-7) ,-7) ) ,7) ) ,4) ) +transpose(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +X) +(X|X) ) ,7) ) ) ,-5) ,12) ) |echo(((((step((((step(X,12) +transpose(X,-7) ) +transpose(transpose(X,-7) ,-5) ) +transpose(transpose(X,4) ,-5) ) ,12) +((shuffle(X) +transpose(step(arpeggio(X) ,12) ,12) ) +transpose(step(echo((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,12) ,12) ) ) +transpose(transpose(echo((step(transpose(((X+transpose(X,12) ) |X) ,-7) ,12) +(X+transpose(arpeggio((X|(X+X) ) ) ,12) ) ) ,4,6) ,-5) ,7) ) |(((transpose(transpose((X|X) ,-5) ,-5) +(echo(transpose((X+transpose(X,4) ) ,4) ,4,6) +((X+transpose(X,7) ) +transpose(transpose((X|(X|X) ) ,-5) ,12) ) ) ) +transpose((shuffle(shuffle(echo(step(transpose(X,-7) ,12) ,4,6) ) ) +transpose(transpose(step(transpose((X+transpose(X,7) ) ,-7) ,12) ,4) ,7) ) ,12) ) +transpose((arpeggio(((((arpeggio(X) +X) +transpose((X+X) ,7) ) |echo((X+transpose(X,7) ) ,4,6) ) +(((((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(((X+X) +transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) |(step(X,12) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) ) ) +transpose(((X+step(transpose(X,-7) ,12) ) +transpose(((transpose((transpose((X|X) ,4) +transpose((transpose(X,-7) |transpose(X,-5) ) ,12) ) ,-7) +transpose((X+(transpose(transpose(X,-7) ,4) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) ) ,4) ) +transpose(arpeggio(transpose(((X|X) +transpose((X|X) ,12) ) ,-7) ) ,7) ) ,7) ) ,7) ) ,12) ) ) +transpose(shuffle(transpose(((((step((shuffle(X) +transpose(arpeggio((X+X) ) ,12) ) ,12) +transpose(transpose(shuffle((shuffle(arpeggio(X) ) +transpose(((shuffle(X) +transpose(transpose(X,-5) ,12) ) +(X+transpose(X,7) ) ) ,7) ) ) ,-7) ,4) ) +transpose((((transpose(((X|X) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ,4) +transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) |(X+transpose(X,7) ) ) ,7) ) +transpose((transpose((step((X+transpose(X,12) ) ,12) |transpose(X,4) ) ,4) |(shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) |transpose(X,-7) ) ) ,7) ) +transpose(((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |transpose(X,-7) ) +transpose(transpose(((X+transpose(X,7) ) +(X+transpose(X,12) ) ) ,4) ,4) ) +transpose(step(X,12) ,7) ) +transpose(echo(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |transpose(transpose(X,4) ,4) ) ,4,6) ,7) ) ,7) ) ,7) ) +transpose(transpose(((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(echo((X+transpose(X,-7) ) ,4,6) ,-7) ,12) ) ,-5) ,4) ) +transpose((transpose((X|X) ,-7) +transpose(transpose(arpeggio(X) ,-7) ,4) ) ,7) ) ,-5) ) ,12) ) ,4,6) ) +transpose(shuffle(transpose(((transpose((transpose(transpose(X,4) ,4) +(transpose(transpose(X,-7) ,4) +step((X+transpose(shuffle(X) ,7) ) ,12) ) ) ,4) +transpose((transpose(transpose(shuffle((X+transpose(X,7) ) ) ,-7) ,4) |(arpeggio(arpeggio((step((((X+transpose(X,4) ) +transpose((X+X) ,7) ) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ,12) |transpose(((transpose((X|X) ,4) +transpose((X+X) ,4) ) +transpose(X,7) ) ,-7) ) ) ) +transpose(step(transpose(transpose((transpose(X,-5) |(X+X) ) ,4) ,4) ,12) ,12) ) ) ,4) ) +transpose((transpose((shuffle(transpose(((step(arpeggio(X) ,12) +transpose(echo((X+X) ,4,6) ,7) ) |transpose((X+transpose(X,7) ) ,4) ) ,-7) ) +transpose(((((transpose(transpose((X+transpose(transpose(X,-5) ,7) ) ,4) ,-5) +transpose((((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose((((X+X) |X) +transpose(X,12) ) ,12) ) |arpeggio(transpose((X+X) ,-5) ) ) +shuffle(transpose(transpose(X,-7) ,-5) ) ) ,4) ) +transpose((transpose(echo((X+transpose(X,7) ) ,4,6) ,4) +(transpose(X,-5) +transpose(echo(X,4,6) ,7) ) ) ,7) ) +transpose((echo((X|X) ,4,6) +transpose(transpose(((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ,-5) ) ,4) ) +transpose(transpose((arpeggio((transpose((echo(X,4,6) |(X+X) ) ,-7) |X) ) +((((transpose(X,-7) |shuffle(X) ) |(X+arpeggio(X) ) ) +(step(X,12) |transpose(X,4) ) ) +(transpose(shuffle(X) ,4) |step(transpose(X,-5) ,12) ) ) ) ,4) ,7) ) ,12) ) ,-5) +transpose(((transpose((X|X) ,4) +transpose(echo(transpose(X,4) ,4,6) ,-5) ) +(transpose(step(X,12) ,-5) +transpose(step(transpose((transpose(transpose(X,-7) ,4) +X) ,-5) ,12) ,12) ) ) ,12) ) ,7) ) ,-5) ) ,4) ) +transpose((((transpose(((transpose(step(transpose(transpose(step(((shuffle(X) +transpose(X,4) ) +transpose((X|X) ,7) ) ,12) ,-7) ,4) ,12) ,-7) +transpose((transpose((((transpose(transpose(arpeggio(step(X,12) ) ,-7) ,-5) |transpose((transpose(((X|X) +transpose(X,12) ) ,-5) +((X+echo(X,4,6) ) |step(transpose(X,-5) ,12) ) ) ,-5) ) +transpose((transpose(echo(X,4,6) ,4) |(echo(step(X,12) ,4,6) +echo((step(X,12) +X) ,4,6) ) ) ,4) ) +transpose(transpose(transpose((transpose(X,-7) +X) ,-7) ,-7) ,7) ) ,4) +transpose((((((X+transpose((X+transpose(X,12) ) ,7) ) +transpose((shuffle(X) +transpose((X|X) ,7) ) ,7) ) +transpose((transpose((step(X,12) +(X|X) ) ,-5) |transpose((X|(X|X) ) ,-5) ) ,4) ) +transpose(shuffle(((shuffle(X) |(X+X) ) +((X+X) +(X+transpose(X,7) ) ) ) ) ,7) ) |transpose(echo(X,4,6) ,-7) ) ,7) ) ,4) ) +transpose(transpose(transpose((arpeggio(transpose((((transpose(X,-7) +transpose((X|X) ,12) ) +transpose((step(X,12) +transpose(X,12) ) ,12) ) +transpose((transpose((X+transpose(X,7) ) ,-5) +((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) ,12) ) ,-5) ) +transpose((transpose((X+transpose(X,7) ) ,4) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,4) ,4) ,7) ) ,4) +transpose((echo(echo(transpose(shuffle(X) ,-7) ,4,6) ,4,6) |transpose((arpeggio(shuffle(transpose(((X+X) +transpose((X|X) ,7) ) ,-7) ) ) |transpose((shuffle(shuffle(transpose(X,4) ) ) +transpose(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,-5) ) ,4) ) ,-5) ) ,7) ) +echo(transpose(((transpose(transpose(((echo((X+transpose(X,12) ) ,4,6) |((transpose(transpose(step(X,12) ,4) ,-7) +transpose(step((X+X) ,12) ,12) ) +(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) |transpose(X,-5) ) ) ) +transpose(transpose((transpose(transpose(X,4) ,-5) +transpose(((X+X) |X) ,7) ) ,-7) ,7) ) ,-5) ,-5) +((((((transpose(echo(X,4,6) ,-7) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +step(X,12) ) ,-7) ,12) ) |echo((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,12) ) ,4,6) ) +((transpose((X+X) ,-5) +((transpose(arpeggio(X) ,-5) +transpose(transpose(X,-5) ,4) ) +transpose((transpose(X,-5) +transpose((X|X) ,12) ) ,7) ) ) +(transpose(X,4) |(shuffle(X) |arpeggio(X) ) ) ) ) |transpose((transpose(X,-5) +((((X|X) +transpose(echo(X,4,6) ,7) ) +(X+transpose((X+transpose(X,7) ) ,12) ) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +X) |step(X,12) ) ) ) ,-7) ) +transpose(((((X+echo(shuffle(X) ,4,6) ) +transpose(((shuffle(X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4) ) +transpose(((transpose(X,-5) +transpose((echo((X+transpose(X,12) ) ,4,6) |(X+X) ) ,7) ) +echo(step(echo((transpose(X,-7) |X) ,4,6) ,12) ,4,6) ) ,12) ) |transpose((((echo(X,4,6) +transpose(X,4) ) +transpose((X|X) ,7) ) |arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) ) ,4) ) +transpose(transpose((echo(echo(X,4,6) ,4,6) +transpose(transpose((X+shuffle(X) ) ,-5) ,7) ) ,4) ,7) ) ) |arpeggio(arpeggio((((transpose(X,4) |X) +transpose(arpeggio((X+X) ) ,7) ) +transpose((X|((transpose(arpeggio(X) ,-7) +transpose((echo(transpose((X|X) ,-7) ,4,6) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,7) ) ) ) ) ,-7) ,4,6) ) |transpose((transpose(transpose(step((((transpose(X,-5) +transpose(echo((X|X) ,4,6) ,-7) ) |shuffle(transpose(echo(X,4,6) ,4) ) ) +step(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,12) ) ,12) ,-5) ,-7) +((((shuffle((((((X+transpose(transpose(X,4) ,7) ) +arpeggio(X) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +echo(X,4,6) ) ,7) ) +transpose(echo(((X+X) +(X+transpose(X,12) ) ) ,4,6) ,4) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ) |transpose(arpeggio(transpose(((((X|X) +transpose(X,12) ) +X) +transpose((step(X,12) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,-7) ) ,-5) ) +transpose(transpose(step((transpose((X+transpose(X,7) ) ,-7) |(X|transpose(X,-7) ) ) ,12) ,4) ,7) ) +transpose((transpose((transpose(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) |((transpose(echo(echo(X,4,6) ,4,6) ,-7) +transpose(transpose((transpose(transpose(arpeggio(X) ,4) ,4) |X) ,-7) ,4) ) +transpose(((((echo(X,4,6) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) ,7) ) ) ,4) |transpose(((((arpeggio(X) |transpose(X,-5) ) +(X+transpose(X,12) ) ) +transpose(arpeggio(arpeggio(echo(echo(X,4,6) ,4,6) ) ) ,4) ) +transpose(X,7) ) ,-7) ) ,12) ) +(((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,12) ) ) +(((arpeggio(X) +transpose((X|X) ,12) ) +transpose(step(X,12) ,4) ) +transpose(arpeggio(X) ,7) ) ) |((transpose(((transpose(X,4) |X) +transpose(step(X,12) ,-5) ) ,-7) +transpose(transpose(((step(X,12) +transpose(shuffle(step(X,12) ) ,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose(shuffle(arpeggio(arpeggio(echo(X,4,6) ) ) ) ,7) ) ) +transpose((((transpose(shuffle(transpose(X,4) ) ,-7) |transpose(X,4) ) |((transpose(X,-5) +transpose((X|(X+transpose(X,12) ) ) ,12) ) +transpose((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) +transpose(X,7) ) ,7) ) ) +transpose(echo(arpeggio(step(((((X+transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(arpeggio(arpeggio(shuffle(X) ) ) ,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,12) ) ,4,6) ,7) ) ,12) ) ) ) ,-5) ) ,7) ) random seed used was 1 EXPR = (step(((transpose(transpose(transpose(((((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) +transpose(arpeggio(transpose(transpose((transpose(X,-7) |X) ,-5) ,4) ) ,7) ) |transpose(arpeggio(step(arpeggio(X) ,12) ) ,-7) ) +(step((transpose(transpose(shuffle(X) ,-7) ,4) +(((X+transpose((X|X) ,4) ) +transpose(((X+X) +transpose((X|X) ,7) ) ,7) ) +(X+X) ) ) ,12) +echo(arpeggio(((transpose((X+transpose(X,7) ) ,-7) +echo(X,4,6) ) |transpose(echo(X,4,6) ,-5) ) ) ,4,6) ) ) +transpose((transpose(transpose(X,-7) ,-7) |shuffle(transpose(transpose(transpose(X,4) ,4) ,-7) ) ) ,12) ) ,-7) ,-5) ,-5) +transpose(((step(transpose(transpose(transpose((((((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) |(X+X) ) +transpose(((step(X,12) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,4) ,-7) ,4) ,12) +transpose((transpose(echo((transpose(arpeggio((transpose((X|X) ,4) +transpose((X+X) ,-5) ) ) ,-7) +transpose(transpose(((step(transpose((X+transpose(X,7) ) ,-5) ,12) +(((X|X) +transpose((transpose(X,-5) |X) ,12) ) |X) ) +transpose(step(transpose((X+X) ,-7) ,12) ,7) ) ,4) ,7) ) ,4,6) ,-7) +((transpose(transpose(((((((step(arpeggio(echo(X,4,6) ) ,12) +transpose(step((((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(shuffle(step(X,12) ) ,7) ) +transpose(X,4) ) +(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) |((X+transpose(transpose(X,-5) ,12) ) |X) ) ) +(transpose(transpose(X,4) ,4) |arpeggio((X+transpose((X|X) ,7) ) ) ) ) +arpeggio(step(shuffle(X) ,12) ) ) ,-5) ,-5) +transpose(echo((shuffle(transpose((transpose(transpose(transpose(X,4) ,4) ,4) +echo(transpose((((X+transpose(X,12) ) |(arpeggio(X) |X) ) +(transpose(X,-5) |transpose(X,-5) ) ) ,-5) ,4,6) ) ,-5) ) |shuffle(transpose((transpose(X,-7) +transpose(transpose(transpose((X|X) ,-5) ,-7) ,7) ) ,-5) ) ) ,4,6) ,4) ) +transpose(transpose((transpose(shuffle(((transpose((((arpeggio(X) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) +(X+X) ) ,-5) +((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(arpeggio(transpose(X,4) ) ,4) ) ) |echo(((((X|X) |(X+X) ) +transpose((transpose(transpose(echo(X,4,6) ,4) ,4) |(echo(transpose(X,-5) ,4,6) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,4,6) ) ) ,-5) +transpose(step(transpose(transpose(X,4) ,-5) ,12) ,12) ) ,-5) ,7) ) ) ,12) ) +(transpose((((shuffle(((X+transpose(((X+transpose(X,7) ) |(X+transpose(X,7) ) ) ,12) ) +transpose((transpose((X|X) ,-7) +transpose(shuffle(transpose(X,4) ) ,12) ) ,7) ) ) |transpose(transpose(transpose(X,4) ,4) ,-7) ) +transpose(transpose((arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) |echo(echo(X,4,6) ,4,6) ) ,4) ,4) ) +transpose(transpose(echo(shuffle(shuffle((step(X,12) +transpose((X|X) ,12) ) ) ) ,4,6) ,4) ,7) ) ,-7) +transpose(shuffle((arpeggio(((X|X) +transpose(((transpose(X,-5) +transpose((transpose((step(X,12) +transpose(X,7) ) ,-5) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose((transpose(echo(X,4,6) ,-7) |step(transpose(X,4) ,12) ) ,7) ) ,12) ) ) +transpose(transpose((((echo(transpose(X,4) ,4,6) |((X+transpose(X,12) ) +shuffle(X) ) ) |((arpeggio((((X+transpose((X+X) ,7) ) |(X+X) ) +transpose(X,12) ) ) +transpose((X+transpose((shuffle(X) |(((X|X) |transpose(X,-5) ) +transpose(transpose(X,-7) ,12) ) ) ,12) ) ,4) ) +transpose(arpeggio(((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,7) ) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,-7) ,7) ) ) ,7) ) ) ,7) ) |transpose(((transpose(((transpose(step(((transpose(arpeggio(shuffle(X) ) ,4) +transpose(X,12) ) |transpose(transpose(arpeggio(X) ,-7) ,-7) ) ,12) ,-5) +transpose((X+transpose(echo(transpose(X,4) ,4,6) ,7) ) ,4) ) +transpose(transpose(((((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) +transpose(((X+transpose(step(X,12) ,12) ) +(X+(X|X) ) ) ,7) ) +transpose(transpose(arpeggio((echo(X,4,6) +transpose(X,7) ) ) ,-7) ,4) ) +transpose((transpose((step(X,12) +transpose((X+transpose(X,7) ) ,7) ) ,-5) |(step(X,12) +(X|X) ) ) ,7) ) +arpeggio((X+arpeggio(X) ) ) ) ,4) ,7) ) ,4) +transpose(step(echo(arpeggio(step((((X+X) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ,4,6) ,12) ,7) ) +echo((transpose(transpose(transpose(echo((X+(X|X) ) ,4,6) ,-5) ,-7) ,-7) +transpose(transpose(step(shuffle(((transpose((((arpeggio(X) +transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) +arpeggio(transpose(X,4) ) ) ,-7) |((X+X) |shuffle(transpose(X,4) ) ) ) +transpose(transpose((transpose(((X|X) +transpose(X,-7) ) ,-7) |transpose((X+X) ,4) ) ,4) ,12) ) ) ,12) ,4) ,12) ) ,4,6) ) ,-5) ) ,12) +transpose((echo(echo(echo(((transpose(transpose(transpose(echo(transpose(((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) |transpose(transpose(X,4) ,4) ) ,-7) ,4,6) ,-5) ,4) ,-5) +transpose((arpeggio((shuffle((X|X) ) +transpose(((X+transpose(transpose((X|(X+transpose(X,7) ) ) ,-5) ,12) ) |(arpeggio(transpose(X,-5) ) +transpose((arpeggio(X) +transpose(X,-7) ) ,7) ) ) ,7) ) ) +transpose(transpose(transpose(transpose((((((X+transpose(X,7) ) +transpose(step((X|X) ,12) ,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) |(transpose((X+transpose(X,12) ) ,-5) |X) ) ,-5) ,4) ,-7) ,-7) ) ,4) ) +transpose(shuffle(step((arpeggio(transpose(arpeggio(shuffle(X) ) ,-7) ) +((X+transpose(X,12) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ) ,12) ) ,7) ) ,4,6) ,4,6) ,4,6) +transpose((transpose((echo(((((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |((X+X) +transpose((X|(X+X) ) ,7) ) ) +transpose((transpose((shuffle(X) +transpose(X,7) ) ,-5) |transpose((X+X) ,-5) ) ,4) ) +transpose(transpose(echo(transpose(X,-7) ,4,6) ,-7) ,7) ) +((shuffle(transpose((X+transpose(X,4) ) ,-5) ) +(transpose(transpose(X,4) ,4) +transpose(transpose(transpose(X,-5) ,-5) ,-5) ) ) |step(((X+X) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ) ,4,6) |transpose(transpose((transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((transpose(transpose(X,4) ,4) |((X|(X+transpose(X,7) ) ) +(X|X) ) ) ,12) ) ) ,-7) +transpose((transpose(transpose(echo(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((X|X) ,12) ) ,4) ,4,6) ,4) ,-5) +transpose((((transpose((((X+X) +transpose((X|X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) +((((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose((X+X) ,7) ) +transpose(transpose(X,4) ,12) ) |((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(transpose(transpose(transpose(transpose(((X+transpose(transpose(X,4) ,4) ) +transpose((step(X,12) |transpose(X,-7) ) ,7) ) ,4) ,-5) ,4) ,-7) ,4) ) +transpose(echo((((X+transpose(X,7) ) +transpose((transpose(X,-7) +(transpose(X,4) |X) ) ,12) ) +transpose(X,7) ) ,4,6) ,7) ) ,7) ) ,12) ) ,4) ,4) ) ,4) |echo(transpose((transpose(arpeggio((arpeggio(transpose(shuffle(transpose(X,4) ) ,-5) ) +transpose(echo(transpose(((((X+X) |transpose(X,-7) ) +transpose(transpose(X,4) ,7) ) |transpose(step(X,12) ,-5) ) ,-5) ,4,6) ,12) ) ) ,4) |echo((transpose(arpeggio((arpeggio(((X|(X+transpose(X,12) ) ) |transpose(X,4) ) ) +transpose(shuffle(((arpeggio(transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ) ,12) ) ) ,-7) +transpose(step(arpeggio((step(X,12) |((X+transpose((X+transpose(transpose(X,-7) ,7) ) ,7) ) |((X+X) +transpose(((X|X) |X) ,7) ) ) ) ) ,12) ,7) ) ,4,6) ) ,-5) ,4,6) ) ,12) ) ,7) ) random seed used was 0 NOTE: Generated phrase was too large ( 12352 ) , it has been truncated at 5000 notes. EXPR = step(transpose(((((echo(transpose(transpose((transpose(arpeggio((X+X) ) ,-5) +(transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) ) ,-5) +transpose((X|(X+transpose(X,7) ) ) ,12) ) ) ,4) ,-7) ,4,6) +transpose(((transpose(step(arpeggio((step(X,12) |X) ) ,12) ,4) +((step(((X+transpose((echo(X,4,6) |X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) |transpose(((X+transpose(X,7) ) +transpose(step(X,12) ,12) ) ,-5) ) +transpose(transpose(X,-7) ,12) ) ) +(((transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,-5) ,4) +transpose(transpose(X,-5) ,4) ) +transpose(shuffle(step(X,12) ) ,-5) ) +(((X+transpose(arpeggio(X) ,7) ) +transpose((X+X) ,12) ) +(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) +(X+X) ) ) ) ) ,12) ) +echo((((((step(transpose(X,-7) ,12) |transpose(transpose((X|X) ,-5) ,-7) ) |((transpose((((X+transpose(X,12) ) +transpose(step(X,12) ,7) ) +(X+transpose(X,7) ) ) ,-7) +transpose((echo(echo((transpose(X,-7) |transpose(X,-7) ) ,4,6) ,4,6) |transpose(step(X,12) ,-5) ) ,4) ) +transpose(transpose((arpeggio((X+X) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,-5) ,7) ) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) +transpose(((transpose(step((transpose(((transpose((X+X) ,-7) +transpose((X+X) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,-5) |((X+X) +(X+transpose((X+X) ,12) ) ) ) ,12) ,-7) +transpose(echo((transpose((X+X) ,-5) |shuffle(step(X,12) ) ) ,4,6) ,4) ) +transpose(echo((((X+X) +(((X+transpose((X|(X+transpose(X,12) ) ) ,4) ) +transpose((shuffle(X) +X) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ) |transpose(X,-5) ) ,4,6) ,7) ) ,4) ) +transpose(((shuffle(transpose(X,-7) ) +transpose(transpose((transpose(X,-5) +transpose(step((X+X) ,12) ,7) ) ,-5) ,7) ) +transpose(transpose(transpose(((((X+transpose(X,12) ) +transpose((X|X) ,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(step(transpose(X,4) ,12) ,12) ) ,4) ,4) ,12) ) ,7) ) ,4,6) ) +transpose((transpose((transpose(step(transpose((transpose(X,-7) +transpose(transpose(((X+transpose(X,7) ) |transpose(X,4) ) ,-7) ,12) ) ,-7) ,12) ,4) |((transpose(((transpose(shuffle(shuffle(X) ) ,-7) +transpose(transpose(X,-5) ,4) ) +transpose(((echo(X,4,6) +transpose((X+transpose(X,4) ) ,12) ) +transpose(X,4) ) ,7) ) ,-7) |transpose(transpose((transpose(X,-5) |transpose(X,-5) ) ,4) ,-5) ) +transpose(echo((transpose(transpose(((X+transpose(X,7) ) +transpose((step(X,12) +transpose(arpeggio(X) ,12) ) ,12) ) ,-5) ,4) +((transpose((transpose(transpose(X,4) ,4) |shuffle(X) ) ,-5) +transpose((arpeggio((X|X) ) +transpose(((X+X) +transpose(echo((X|X) ,4,6) ,12) ) ,-5) ) ,4) ) +transpose((((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose((step(X,12) +transpose((echo(X,4,6) +transpose(transpose(X,-5) ,12) ) ,7) ) ,7) ) +transpose(step(transpose(X,-5) ,12) ,7) ) ,7) ) ) ,4,6) ,12) ) ) ,-5) +transpose(transpose((transpose(((X+X) +transpose(transpose(X,-7) ,7) ) ,-5) +transpose(transpose(X,-7) ,7) ) ,-7) ,12) ) ,12) ) |(transpose(transpose(((((((transpose(((X+transpose(X,7) ) |X) ,4) |transpose(transpose(transpose(X,-5) ,4) ,4) ) |(transpose(arpeggio(X) ,4) |shuffle(echo(((X+transpose(X,12) ) |shuffle(X) ) ,4,6) ) ) ) +transpose((transpose(((X+X) +transpose(((transpose(X,4) |X) |X) ,12) ) ,-5) +transpose(((arpeggio((transpose(echo(X,4,6) ,4) |(X|shuffle(X) ) ) ) +transpose(((transpose((X+X) ,4) +transpose((X+X) ,12) ) |((X|X) +(X|X) ) ) ,12) ) +transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose((X+transpose(X,12) ) ,12) ) ) +transpose(transpose(((shuffle(X) +transpose(arpeggio(X) ,7) ) +transpose(step(X,12) ,12) ) ,-7) ,4) ) +transpose(((((X|X) +(X|arpeggio(X) ) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,7) ) +transpose((((echo(shuffle(X) ,4,6) +transpose(X,7) ) +transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,4) ) +transpose((transpose(transpose(X,-7) ,4) +transpose(((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,12) ) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) ,12) ) ,4) ) +transpose(((transpose((arpeggio(shuffle((X+transpose(X,-5) ) ) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,-5) +transpose((step(X,12) |(transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) +transpose(X,7) ) ) ,12) ) +transpose((((transpose(echo(X,4,6) ,-7) +transpose(arpeggio(arpeggio(X) ) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) |step(X,12) ) ,4) ) ,7) ) +transpose((transpose((step(transpose((X+arpeggio(arpeggio(X) ) ) ,-5) ,12) +arpeggio(arpeggio(X) ) ) ,-5) |(((transpose((X+X) ,-7) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ,7) ) +transpose((transpose((arpeggio(X) +transpose(transpose(X,-7) ,7) ) ,-5) +transpose(shuffle((((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X|X) ,12) ) ) ,12) ) ,7) ) +transpose((((step((X+transpose(X,7) ) ,12) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) +transpose(((transpose(((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) +transpose((X+X) ,4) ) +transpose((transpose(X,4) +(X+step(X,12) ) ) ,7) ) ,12) ) ,12) ) ) ,4) ) +transpose((((transpose(shuffle(((X+transpose(X,12) ) +transpose(X,7) ) ) ,-7) +transpose((step(X,12) +(((X+transpose(X,12) ) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(step(X,12) ,7) ) ) ,4) ) +transpose((transpose((arpeggio((X+X) ) |(echo(X,4,6) |X) ) ,-5) +shuffle(transpose((transpose(X,-5) +transpose(X,12) ) ,-7) ) ) ,7) ) +transpose((transpose((shuffle(step(transpose((X|X) ,-5) ,12) ) +(((transpose(transpose(X,-5) ,-7) +transpose(((X+transpose(X,12) ) +X) ,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) ,-5) +transpose(echo(transpose(shuffle(X) ,-7) ,4,6) ,4) ) ,7) ) ,7) ) ,4) ,4) |transpose(transpose(((((arpeggio((X|X) ) +transpose(transpose(X,-7) ,4) ) |arpeggio((((X|step(X,12) ) +transpose(transpose((((step(X,12) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ,4) ,4) ) +transpose((transpose(shuffle(X) ,-5) +shuffle((X|X) ) ) ,7) ) ) ) +transpose((transpose(((echo(step(X,12) ,4,6) +transpose(arpeggio((arpeggio(X) |transpose(X,4) ) ) ,7) ) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,12) ) ,-7) +transpose(transpose((((transpose((X+X) ,4) +(transpose(X,-5) |((step(X,12) +(X+X) ) +transpose(transpose((X|X) ,-5) ,7) ) ) ) +transpose(((transpose(X,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(step((transpose(X,-7) +transpose(X,12) ) ,12) ,12) ) ,7) ) ,-5) ,7) ) ,12) ) +(transpose(transpose(transpose(((X+X) +shuffle(step(X,12) ) ) ,4) ,4) ,-7) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ,4) ) ) ,4) ,-7) ) ) ,-7) ,12) random seed used was 0 EXPR = transpose(shuffle(((echo(transpose(shuffle((shuffle((echo((transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,-5) ) ,-7) |X) ,4,6) |transpose(transpose(transpose(step(X,12) ,-7) ,-7) ,-5) ) ) |(shuffle(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((X+transpose(X,4) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose(transpose(((X+transpose(((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) ) |transpose((X+transpose(echo(X,4,6) ,7) ) ,4) ) ,-5) ,12) ) ) ) ,4) ,4,6) +transpose((shuffle(((echo((transpose(transpose(((transpose(arpeggio(X) ,-5) +transpose(transpose(X,4) ,12) ) +transpose(X,-7) ) ,-5) ,4) |(shuffle((echo((X+X) ,4,6) +step(transpose(shuffle(X) ,-5) ,12) ) ) +transpose(transpose(transpose(transpose(step(X,12) ,-5) ,-7) ,4) ,7) ) ) ,4,6) +transpose((transpose(((X|X) |(transpose(X,-5) |(X+((X+transpose(X,7) ) |transpose(X,4) ) ) ) ) ,-5) +transpose((transpose(transpose(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(((echo(X,4,6) +transpose((X|X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) +X) ,-5) ,7) ) ,-5) ,-5) |transpose(shuffle(transpose(transpose(X,-5) ,4) ) ,-5) ) ,7) ) ,7) ) |(transpose(transpose(shuffle(transpose(X,-5) ) ,4) ,-7) +transpose(((arpeggio(transpose((echo(((X+transpose(X,12) ) |(X+X) ) ,4,6) +arpeggio(X) ) ,4) ) +transpose(transpose(((X+transpose(X,7) ) +(X|X) ) ,-5) ,7) ) +transpose((((((transpose((X+transpose(X,7) ) ,-7) +transpose(X,-5) ) |transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,-7) ) +transpose((((step(X,12) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) +transpose((transpose(transpose(X,4) ,-7) |transpose(X,-7) ) ,7) ) ,12) ) +transpose(transpose((echo(transpose(X,4) ,4,6) |shuffle(transpose((X|X) ,4) ) ) ,-5) ,7) ) +step(step(arpeggio((step(X,12) |(X+transpose(X,7) ) ) ) ,12) ,12) ) ,7) ) ,7) ) ) ) +transpose(shuffle(arpeggio((echo(step(((X+X) +transpose(transpose((echo(X,4,6) +(X+transpose(X,7) ) ) ,-5) ,12) ) ,12) ,4,6) +transpose(step(transpose(transpose(arpeggio(X) ,4) ,-5) ,12) ,7) ) ) ) ,7) ) ,12) ) +transpose(transpose((transpose((shuffle((transpose(((transpose(step(echo(echo(X,4,6) ,4,6) ,12) ,4) +step((X+arpeggio(X) ) ,12) ) +transpose((step(transpose(X,-5) ,12) +step(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,-7) ,12) ) ,7) ) ,-7) +transpose(transpose((((((transpose(X,4) |(X+transpose(X,7) ) ) +transpose((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(step(X,12) ,4) ) ,7) ) +(transpose(X,4) +transpose(step(X,12) ,12) ) ) +transpose((transpose(transpose(step(X,12) ,-7) ,-5) +transpose(transpose((transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,-7) ) ,4) ) +transpose((transpose(echo((X+X) ,4,6) ,4) |transpose(transpose(transpose((X+X) ,-7) ,4) ,-7) ) ,7) ) ,-5) ,12) ) ) +transpose(((transpose(transpose(echo((((transpose((X|X) ,-5) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +(X+transpose((X+transpose(X,7) ) ,7) ) ) ,4,6) ,-7) ,-5) +transpose((((transpose(((transpose(X,-7) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,12) ) +X) ,7) ) ,-7) +transpose(transpose(transpose((step(step(X,12) ,12) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,-7) ,4) ,7) ) +transpose((shuffle(((transpose(transpose(X,-5) ,4) |arpeggio(X) ) |transpose(transpose(transpose((X+X) ,-7) ,-7) ,-7) ) ) +transpose(echo((((X+X) +transpose((X|X) ,12) ) +X) ,4,6) ,7) ) ,4) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) ,7) ) |step(transpose((transpose(step(X,12) ,-5) +(((X+transpose(X,7) ) |X) +(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(step((X+X) ,12) ,12) ) ) ) ,-5) ,12) ) ,12) ) ,-7) +step(transpose(transpose(transpose(((arpeggio(transpose((echo(X,4,6) +transpose(X,4) ) ,-7) ) +transpose(transpose(X,4) ,4) ) +arpeggio(transpose(X,4) ) ) ,4) ,-7) ,4) ,12) ) ,4) ,12) ) ) ,4) random seed used was 0

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