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: transpose(arpeggio(((echo(shuffle(echo(transpose(arpeggio(((transpose(X,-5) |transpose(X,4) ) +transpose(((X+X) |transpose(step(X,12) ,4) ) ,12) ) ) ,-5) ,4,6) ) ,4,6) +transpose((((transpose((arpeggio((step(X,12) +transpose(transpose(X,4) ,7) ) ) +transpose(transpose(transpose(shuffle(X) ,-7) ,-7) ,12) ) ,4) +transpose((arpeggio(transpose(transpose(X,-5) ,-5) ) |((step(X,12) +transpose(X,-7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) +step(transpose(echo(transpose((X+transpose(X,7) ) ,4) ,4,6) ,-7) ,12) ) |step(arpeggio(transpose((echo((transpose(X,-5) |transpose(X,4) ) ,4,6) |shuffle(((shuffle((X+transpose((X+transpose(X,12) ) ,7) ) ) +transpose(((step(X,12) +X) +shuffle(X) ) ,4) ) +transpose(((transpose(transpose(X,-7) ,-5) +transpose(X,4) ) +transpose(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,7) ) ) ) ,-5) ) ,12) ) ,12) ) +transpose(transpose(((echo(transpose((X+X) ,-5) ,4,6) +transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,7) ) +transpose(shuffle(transpose(step(X,12) ,-5) ) ,4) ) ,4) ,12) ) ) ,4) random seed used was 3442951 EXPR = step(((transpose((((shuffle((((echo(X,4,6) +transpose((shuffle(X) |X) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ) |(transpose(transpose(transpose(arpeggio(shuffle(transpose(X,4) ) ) ,4) ,-5) ,4) +transpose((transpose(((X|X) +X) ,-5) +transpose(arpeggio((((X+transpose(X,12) ) +X) +transpose((X+transpose(X,7) ) ,12) ) ) ,7) ) ,12) ) ) |transpose(transpose((((transpose(transpose(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) ,-7) ,-5) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose(transpose(X,-7) ,7) ) +((transpose((transpose(step(X,12) ,4) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ,4) |step(echo(echo(X,4,6) ,4,6) ,12) ) +arpeggio(transpose((transpose(X,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) ) ) ,-5) ,4) ) |(echo(((((X|X) |(X+X) ) +transpose(transpose((X|transpose(X,4) ) ,-5) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,7) ) ,4,6) |arpeggio(((transpose(echo(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ,4,6) ,4) +transpose(((((transpose(X,-7) +transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose(((X+transpose(X,12) ) +(X|X) ) ,7) ) +transpose(arpeggio(((X|X) +transpose(X,-5) ) ) ,7) ) +transpose((((X+transpose((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) |X) ,7) ) ,-7) ) +shuffle((transpose((((shuffle(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) |transpose((X+transpose(X,7) ) ,4) ) ,-5) +(X+transpose((X+X) ,4) ) ) ) ) ) ) ) ,-7) |(((transpose((shuffle((transpose(echo((X+transpose(shuffle(X) ,12) ) ,4,6) ,4) +arpeggio((transpose(((X|echo(X,4,6) ) |(X|X) ) ,-7) |echo(((transpose(X,4) +X) +shuffle(X) ) ,4,6) ) ) ) ) +arpeggio(shuffle(transpose((X|X) ,-7) ) ) ) ,4) +transpose(((transpose(arpeggio(transpose(transpose((transpose(echo((X+X) ,4,6) ,4) +transpose(shuffle(((step(X,12) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ) ,12) ) ,-7) ,-7) ) ,-5) +transpose((((step((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ,12) +transpose(step((X+transpose(X,7) ) ,12) ,12) ) |(transpose(((echo(X,4,6) |((X|X) |transpose(X,-5) ) ) +transpose(transpose(X,-5) ,-7) ) ,-7) |shuffle((X+(X+transpose(X,12) ) ) ) ) ) |transpose((shuffle(((X|X) |X) ) +transpose((echo((X+transpose(transpose(X,4) ,12) ) ,4,6) +transpose(((X|X) +transpose(transpose((transpose(X,4) |transpose(X,4) ) ,4) ,7) ) ,7) ) ,12) ) ,4) ) ,4) ) +transpose(((shuffle(transpose((step((shuffle(step(transpose(X,4) ,12) ) +transpose(transpose(X,-5) ,12) ) ,12) |transpose((step(X,12) |((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,4) ) ,-5) ) +transpose((((echo(X,4,6) +step((X|X) ,12) ) +transpose((((transpose(transpose(((X+transpose(step(X,12) ,4) ) +transpose((X+X) ,7) ) ,4) ,4) +((X|X) +(X+transpose(X,12) ) ) ) +transpose((transpose((X+transpose(X,7) ) ,4) +((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose(transpose(echo(shuffle(transpose(X,4) ) ,4,6) ,4) ,7) ) ,4) ) +transpose(transpose(transpose((transpose(transpose(X,4) ,4) +transpose(transpose((X+X) ,-5) ,7) ) ,-7) ,-7) ,7) ) ,7) ) +transpose((transpose(transpose(((transpose(((((X+transpose(X,12) ) +X) +transpose((echo((X+transpose(X,12) ) ,4,6) |transpose(X,-7) ) ,4) ) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((step(X,12) +(X|X) ) ,4) ) +transpose((step(transpose(X,-5) ,12) +transpose((X+X) ,-5) ) ,7) ) ,7) ) ,-5) +transpose(transpose(((transpose(transpose(X,-7) ,-7) |X) |transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,-5) ) ,-5) ,4) ) +transpose(echo(((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) +(step(X,12) +transpose(transpose(X,-7) ,7) ) ) ,4,6) ,7) ) ,-5) ,-5) +(((transpose((transpose(transpose((X|X) ,4) ,-5) +(X+transpose(X,12) ) ) ,-5) |transpose((transpose((transpose(X,-7) |((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ) ,4) +transpose((((echo(X,4,6) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose(transpose(X,-5) ,7) ) |echo((transpose(X,4) |(X+transpose(X,12) ) ) ,4,6) ) ,12) ) ,-7) ) +(echo(arpeggio(transpose((arpeggio(X) +transpose(echo((X+X) ,4,6) ,12) ) ,4) ) ,4,6) +(((transpose(shuffle(X) ,-5) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) |shuffle(transpose(X,-5) ) ) +transpose(transpose((step((X|X) ,12) +transpose(X,-7) ) ,4) ,7) ) ) ) +transpose(shuffle((step((X|echo(X,4,6) ) ,12) |step(step(((X+X) |X) ,12) ,12) ) ) ,-5) ) ) ,7) ) ,7) ) ,4) ) +transpose((((shuffle(transpose((transpose(shuffle(transpose((X+transpose(X,12) ) ,4) ) ,-5) +((transpose(echo(transpose(X,-7) ,4,6) ,4) +transpose(step((X+(X+transpose(X,12) ) ) ,12) ,12) ) |(((transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,-5) +transpose(shuffle(transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) ,7) ) +transpose(shuffle(X) ,4) ) +transpose((transpose(shuffle(transpose(X,-7) ) ,4) |(transpose((transpose(X,-5) +X) ,-7) +arpeggio(echo(X,4,6) ) ) ) ,7) ) ) ) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,-5) ) +(transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) ,-5) |transpose((arpeggio(X) +(X+X) ) ,4) ) ) +transpose(transpose(transpose((((step(transpose((X+X) ,4) ,12) +transpose(arpeggio(transpose(transpose((X|(transpose(X,-7) |shuffle(X) ) ) ,-5) ,-5) ) ,7) ) +transpose(step((arpeggio(transpose(((arpeggio(X) +X) +((X+transpose((X+X) ,4) ) +transpose(X,7) ) ) ,4) ) |(echo(echo(step((echo(X,4,6) |X) ,12) ,4,6) ,4,6) |shuffle(shuffle((arpeggio(transpose(X,-5) ) +arpeggio(transpose(X,-5) ) ) ) ) ) ) ,12) ,4) ) +transpose(((transpose((arpeggio((transpose(X,-5) +transpose((X+transpose(X,7) ) ,12) ) ) +shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) |(transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,-7) +transpose((((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,7) ) ) +transpose((X|(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) |transpose(transpose(X,-7) ,4) ) ) ,12) ) ,7) ) ,4) ,4) ,7) ) ,7) ) +transpose((shuffle((step(step((transpose(echo((transpose(X,-5) +transpose(((X|X) +transpose(X,12) ) ,12) ) ,4,6) ,-5) +transpose((transpose(arpeggio(transpose((X+transpose(X,7) ) ,4) ) ,-7) |(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) +transpose(((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) ) ) ,12) ) ,12) ,12) +transpose(transpose(transpose(transpose(step((arpeggio((X+transpose(X,12) ) ) +transpose(transpose(arpeggio(X) ,-5) ,12) ) ,12) ,4) ,-7) ,-5) ,4) ) ) +transpose(((((step(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,12) +transpose(shuffle(((X|(X+transpose(X,7) ) ) +transpose(X,-7) ) ) ,4) ) +transpose((((transpose(X,-5) +transpose(X,4) ) +transpose((X|X) ,7) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,7) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose(shuffle((echo(X,4,6) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,12) ) ) ,12) ) ,12) ) |arpeggio(step((shuffle(X) +transpose(step(X,12) ,12) ) ,12) ) ) ,7) ) ,4) ) ) |(arpeggio((transpose(shuffle(((transpose(X,4) +transpose((X+X) ,7) ) +transpose(transpose(X,4) ,7) ) ) ,-5) |arpeggio(echo((transpose(shuffle(shuffle(X) ) ,-7) +transpose(transpose(step(X,12) ,4) ,-5) ) ,4,6) ) ) ) +(((transpose(echo(transpose((shuffle(echo(transpose(((transpose(step(X,12) ,4) +transpose(((X|X) +X) ,7) ) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,4) ,4,6) ) |transpose(transpose(transpose(echo(((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-5) ,4) ,-5) ) ,-5) ,4,6) ,-5) |step((step(echo(((transpose(((transpose((X|(transpose(X,-5) +echo(X,4,6) ) ) ,-7) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose((shuffle((X|X) ) +transpose((X+X) ,7) ) ,7) ) ,-7) +transpose((echo(transpose(X,-5) ,4,6) +transpose(transpose(((transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) +transpose((echo(X,4,6) +((X|X) +(X+X) ) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,-5) ,7) ) ,4) ) +transpose((((transpose((((X+X) +transpose(transpose((X|X) ,4) ,4) ) +transpose(X,7) ) ,4) +echo(echo(transpose(X,-7) ,4,6) ,4,6) ) +transpose(echo(transpose((((transpose(X,4) |X) +transpose(((X|X) +transpose(transpose(X,-5) ,7) ) ,-5) ) +(transpose(X,-7) +transpose(X,7) ) ) ,-7) ,4,6) ,4) ) +transpose(((transpose(transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ,-5) ,4) +transpose(step(transpose(echo(X,4,6) ,-7) ,12) ,4) ) +transpose((((X|X) +transpose(transpose(X,-5) ,12) ) |(shuffle(X) +transpose((transpose(X,4) +transpose((X|X) ,7) ) ,-5) ) ) ,7) ) ,7) ) ,7) ) ,4,6) ,12) |(shuffle((((X|X) +X) +transpose(transpose(X,-7) ,12) ) ) +transpose(((transpose(shuffle((X+X) ) ,-5) |(transpose(X,-7) |((X+transpose(X,12) ) +transpose(X,4) ) ) ) +(((transpose(X,4) |X) +transpose(((transpose((X|X) ,4) +transpose((transpose(X,4) +transpose(X,7) ) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) ,12) ) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) ) ,7) ) ) ,12) ) +transpose(((((((transpose(((arpeggio(((transpose((X+transpose(X,12) ) ,4) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ) +transpose(transpose(((step(transpose((transpose((X+X) ,4) |((X|X) |transpose(X,-7) ) ) ,4) ,12) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(arpeggio(X) ,-7) ,-7) ) ,4) ) +transpose(((((X|(X+transpose(X,7) ) ) +transpose((step(X,12) |step(transpose(X,-5) ,12) ) ,7) ) +transpose((X+X) ,4) ) +transpose((transpose(X,-7) |X) ,7) ) ,7) ) ,-5) ,4) ) +transpose(transpose((((X|X) |transpose((X+transpose(X,12) ) ,4) ) +shuffle(X) ) ,-7) ,7) ) ,4) +transpose((transpose(transpose(transpose((X|X) ,-5) ,4) ,4) +transpose(transpose(shuffle(X) ,-7) ,-5) ) ,4) ) +transpose(((transpose((transpose(step(transpose((X+transpose(X,7) ) ,-7) ,12) ,-7) +transpose(transpose(step(X,12) ,4) ,12) ) ,-5) +transpose(shuffle(transpose((shuffle(X) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ) ,12) ) +transpose(((echo((echo(step(X,12) ,4,6) +transpose(echo(((transpose(X,-5) +transpose((X+X) ,12) ) +transpose((echo(X,4,6) +echo(X,4,6) ) ,7) ) ,4,6) ,7) ) ,4,6) +transpose(shuffle(transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(X,12) ) ,-5) ) ,4) ) +transpose(shuffle((((transpose(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ,4) +transpose(shuffle(X) ,4) ) +transpose((((X+X) +transpose(transpose(X,-5) ,7) ) +transpose(X,4) ) ,12) ) |shuffle((arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +transpose(arpeggio(transpose((X+transpose(X,7) ) ,-7) ) ,7) ) ) ) ) ,7) ) ,4) ) ,7) ) +transpose((transpose((transpose(((transpose(X,-7) +transpose(X,-7) ) |(((transpose(X,4) +(X+X) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ) ,-5) +echo(((shuffle(step(transpose((X+X) ,4) ,12) ) +transpose(shuffle(transpose((X+X) ,4) ) ,4) ) +transpose((transpose((transpose(X,4) +transpose(transpose(X,-5) ,12) ) ,-7) +transpose((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,7) ) ,4,6) ) ,-7) |echo(echo((((((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(step(X,12) ,-5) ,7) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) +(X|(transpose(X,-5) |transpose(X,-7) ) ) ) ,4,6) ,4,6) ) ,4) ) +transpose((((transpose(arpeggio(((((transpose(transpose(X,4) ,-5) +transpose(transpose(X,4) ,7) ) +transpose(transpose(transpose((X|X) ,-5) ,-7) ,4) ) +transpose(step(X,12) ,7) ) +transpose(transpose(X,-5) ,12) ) ) ,-5) +transpose(transpose(transpose(((transpose(transpose(X,-7) ,-7) +transpose(X,-5) ) +arpeggio(((((X|X) +transpose(step(X,12) ,7) ) +transpose((X|X) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) ) ) ,-5) ,-7) ,12) ) +transpose((transpose((shuffle(step((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,4) +transpose(shuffle(transpose(transpose(X,4) ,-7) ) ,12) ) ,12) ) +transpose(transpose(((X+transpose((X+X) ,4) ) +transpose(transpose(X,4) ,12) ) ,4) ,7) ) ,-7) +transpose(transpose(echo((transpose((transpose(X,4) |X) ,-5) +transpose(echo((step(X,12) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,-7) ) ,4,6) ,4) ,-7) ) ,4) ) +transpose(step(((transpose(transpose((((transpose(X,4) +transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose((X|(X+X) ) ,7) ) ,-5) ,-7) +transpose(transpose((((X|X) +X) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,4) ,12) ) +transpose(((transpose(X,4) |shuffle((arpeggio(X) |shuffle(X) ) ) ) +transpose(((((X+echo(X,4,6) ) +transpose(((transpose(X,4) +transpose(X,12) ) +echo(X,4,6) ) ,4) ) +transpose(echo(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ,7) ) +transpose(transpose(step(shuffle(X) ,12) ,-7) ,7) ) ,7) ) ,12) ) ,12) ,7) ) ,7) ) +transpose(arpeggio((transpose((((((((X|(X+X) ) +shuffle((X|X) ) ) |transpose(((X+transpose(X,12) ) +(transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,-5) ) +transpose(shuffle(((echo(transpose((X+X) ,4) ,4,6) |X) +transpose((transpose(X,-7) +transpose(X,7) ) ,12) ) ) ,7) ) +transpose(((transpose(arpeggio(X) ,-5) +transpose(((transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ,-7) +transpose(shuffle(arpeggio(step((X+transpose(X,12) ) ,12) ) ) ,4) ) +transpose(((shuffle(X) +transpose(X,-5) ) +transpose(step(transpose(X,4) ,12) ,12) ) ,7) ) ,12) ) +transpose(shuffle((transpose(echo(transpose(X,4) ,4,6) ,-5) +transpose(echo(transpose(transpose(X,4) ,-5) ,4,6) ,7) ) ) ,7) ) ,12) ) +transpose(arpeggio(echo(echo(transpose(((((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((echo(X,4,6) |X) ,7) ) ,4) ,4,6) ,4,6) ) ,4) ) +transpose(transpose(transpose(((X+X) +transpose((shuffle(X) +transpose(transpose(X,4) ,12) ) ,12) ) ,-7) ,4) ,7) ) ,-5) +transpose((transpose((transpose((shuffle(((transpose(X,4) +transpose(transpose(transpose(X,-5) ,4) ,7) ) +transpose(transpose((X+X) ,4) ,-5) ) ) +step(echo(X,4,6) ,12) ) ,4) +transpose((shuffle(shuffle(((step(X,12) |(X+transpose(X,12) ) ) +transpose((((X|X) +transpose(X,7) ) +((X+transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ) ) |((transpose(X,4) +transpose((X+X) ,7) ) |transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,4) ) ) ,7) ) ,4) +transpose(step((((((step(X,12) +((X|transpose(X,-5) ) |echo(X,4,6) ) ) +transpose(arpeggio((transpose(X,4) |(((X+X) +transpose((X|X) ,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose(transpose(transpose((X+(X+transpose(X,7) ) ) ,-5) ,-7) ,7) ) |transpose(((echo(X,4,6) |transpose(arpeggio(X) ,-5) ) |((arpeggio(X) |((echo(X,4,6) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ) +transpose((X+echo(arpeggio(X) ,4,6) ) ,7) ) ) ,-5) ) +transpose(step((transpose(transpose(((X+X) |((transpose((X+transpose(X,12) ) ,-7) +transpose((transpose(X,4) |X) ,4) ) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) ,4) ,-5) +transpose(echo(((X+X) +transpose(shuffle(X) ,12) ) ,4,6) ,12) ) ,12) ,7) ) ,12) ,12) ) ,7) ) ) ,4) ) +transpose(step(echo(echo(((transpose(transpose(step(transpose(echo(shuffle(X) ,4,6) ,-7) ,12) ,4) ,-7) +transpose(transpose(transpose((arpeggio((X|X) ) +transpose(transpose(X,4) ,7) ) ,-5) ,-7) ,4) ) +transpose((echo((((transpose((transpose(X,-7) +transpose(X,12) ) ,4) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) +transpose(echo(transpose(transpose(X,-7) ,-7) ,4,6) ,4) ) +transpose(transpose((transpose(transpose(step(X,12) ,-7) ,4) +transpose(transpose(shuffle(X) ,-7) ,12) ) ,-5) ,7) ) ,4,6) |(transpose((((transpose((X+transpose(X,12) ) ,-7) |transpose(X,-7) ) |arpeggio((echo(X,4,6) |shuffle(X) ) ) ) |arpeggio(step(transpose(transpose(X,-7) ,-5) ,12) ) ) ,-7) |((transpose(shuffle(transpose(arpeggio(X) ,-7) ) ,4) +transpose((X|transpose(((X+X) +(X+transpose(X,7) ) ) ,4) ) ,7) ) +step(((echo(X,4,6) |X) +transpose(((X+transpose(X,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,12) ) ,12) ) ) ) ,7) ) ,4,6) ,4,6) ,12) ,7) ) ,7) ) |((transpose(transpose(transpose((((transpose(X,4) |transpose(step(X,12) ,-7) ) +transpose(((transpose(X,4) |transpose(arpeggio((X+X) ) ,-7) ) +((arpeggio((X+transpose(X,12) ) ) +step(X,12) ) +shuffle(shuffle(X) ) ) ) ,7) ) +(transpose(((arpeggio(X) +transpose(X,4) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) ,4) |transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) ) ) ,-7) ,4) ,-7) |transpose(arpeggio(((((((transpose(X,4) +step(echo(X,4,6) ,12) ) +transpose(step(echo(((transpose(X,-5) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ,12) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) +transpose((transpose((step((X+transpose(X,7) ) ,12) +((transpose(X,-7) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) |X) ,4) ) +transpose(shuffle(arpeggio(arpeggio(((transpose(X,-5) |arpeggio((X+X) ) ) +transpose(echo((transpose(X,-7) +X) ,4,6) ,7) ) ) ) ) ,7) ) |echo((transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) ,-7) +transpose((shuffle((((X+X) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +((transpose(arpeggio(X) ,4) |(((X+X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(transpose((shuffle((X+transpose(X,12) ) ) +transpose((transpose(X,-5) +transpose(X,7) ) ,7) ) ,4) ,7) ) ) ,12) ) ,4,6) ) ) ,4) ) +transpose(transpose((step(transpose(echo(transpose(arpeggio((X+transpose(X,12) ) ) ,4) ,4,6) ,4) ,12) |transpose(((transpose((((X+transpose(X,7) ) +X) +(shuffle(X) +transpose(X,7) ) ) ,-5) +transpose(step(X,12) ,-7) ) |(((((X|X) +transpose(((X+X) |transpose(X,-5) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) +transpose(shuffle((shuffle(X) +((X+X) |X) ) ) ,7) ) ) ,4) ) ,-5) ,7) ) ) ) ) ,12) random seed used was 0 NOTE: Generated phrase was too large ( 11054 ) , it has been truncated at 5000 notes. EXPR = transpose(transpose((((transpose(((shuffle((echo(echo(shuffle(arpeggio(((X+X) +(echo((X|X) ,4,6) +X) ) ) ) ,4,6) ,4,6) |transpose(transpose(((step((X|X) ,12) +transpose((transpose(transpose(X,-5) ,4) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) ,4) ) +transpose((transpose(((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) |transpose((transpose(X,-5) +(X+transpose(X,7) ) ) ,-5) ) ,7) ) ,-7) ,4) ) ) +transpose(step(step(step(transpose(((echo(transpose(transpose(X,-5) ,-5) ,4,6) |(transpose(X,4) +((transpose(X,-5) |shuffle(X) ) +transpose((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ,12) ) ) ) +transpose(((transpose(X,-7) +(echo((X+X) ,4,6) +transpose((transpose(X,-5) +transpose(X,7) ) ,12) ) ) +transpose(transpose(((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) ,-7) ,-5) ) ,12) ) ,-7) ,12) ,12) ,12) ,4) ) +transpose(shuffle(((shuffle(transpose(X,-7) ) +transpose(transpose(transpose((echo(X,4,6) +X) ,-5) ,4) ,7) ) +transpose(arpeggio(shuffle((step(arpeggio(X) ,12) +transpose(transpose(((((X+transpose(X,12) ) +(X+transpose(X,7) ) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,12) ) ) ) ,12) ) ) ,7) ) ,4) +transpose(arpeggio((transpose(((((echo(transpose(((X+transpose((X+transpose(X,4) ) ,12) ) +transpose(transpose((X+X) ,4) ,7) ) ,-5) ,4,6) +transpose((step(arpeggio((echo((((X|X) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) +(transpose(X,4) +transpose(transpose(X,-5) ,12) ) ) ) ,12) +((step(X,12) |X) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ) ,4) ) +transpose((((((echo(X,4,6) |(X|X) ) +transpose(X,7) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) +transpose((transpose(shuffle(arpeggio(X) ) ,-7) +transpose((transpose(transpose(X,4) ,4) |(X+X) ) ,12) ) ,7) ) ,7) ) +transpose(arpeggio(arpeggio((transpose(arpeggio(transpose((X|X) ,-5) ) ,-7) |arpeggio(echo(step(transpose(X,-7) ,12) ,4,6) ) ) ) ) ,12) ) |transpose(transpose(((arpeggio(step((transpose(X,4) +X) ,12) ) +transpose((X+transpose(X,7) ) ,-7) ) +transpose(step((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose((transpose((X+transpose(X,12) ) ,-7) |(transpose((X+X) ,-7) +arpeggio(echo(X,4,6) ) ) ) ,7) ) ,12) ,7) ) ,-7) ,4) ) ,-7) +transpose((((transpose(((X+(transpose((X+transpose(X,12) ) ,4) +(X+X) ) ) +((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(((X|X) +X) ,7) ) ) ,-7) +transpose((((arpeggio(transpose(X,-5) ) +transpose(step((X+transpose(X,12) ) ,12) ,4) ) +transpose((X+transpose(transpose(X,4) ,7) ) ,7) ) +(transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) ) ,-7) ) +transpose((echo((transpose(((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) +transpose(transpose(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ,-5) ,7) ) ,4,6) +transpose((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) +transpose((((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((echo(X,4,6) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose((X|transpose(X,-5) ) ,7) ) ,7) ) ,12) ) ,-7) ) |transpose((transpose(transpose(((((echo(step(shuffle(X) ,12) ,4,6) +transpose((step(X,12) +transpose(X,4) ) ,12) ) +transpose(transpose(((X+transpose(echo(X,4,6) ,12) ) +transpose(X,4) ) ,-5) ,4) ) +transpose(transpose((X+transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ,4) ,7) ) +(transpose((((X+X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) |echo(((X|(X+transpose(X,7) ) ) +transpose(X,-7) ) ,4,6) ) ) ,-7) ,-5) +transpose(arpeggio(transpose(step((echo(transpose((X+transpose(step(X,12) ,7) ) ,4) ,4,6) |((((X|X) +transpose((X+X) ,4) ) +transpose(echo(shuffle((X+transpose(X,12) ) ) ,4,6) ,4) ) +transpose(((echo(transpose(X,-5) ,4,6) |transpose(echo(X,4,6) ,-7) ) |(((X+transpose(X,12) ) +transpose((transpose(X,-7) |X) ,4) ) +transpose(X,7) ) ) ,7) ) ) ,12) ,-7) ) ,12) ) ,-7) ) ,12) ) ) ,4) ) +transpose(transpose((((((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,7) ) +(transpose(arpeggio(X) ,4) +(step(X,12) |X) ) ) +(shuffle(((X+X) +transpose((X+transpose(X,12) ) ,12) ) ) +echo((transpose(X,-5) +transpose(transpose((X+X) ,4) ,12) ) ,4,6) ) ) +transpose(arpeggio((echo((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4,6) +transpose(((X+transpose(X,7) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) ,7) ) ) ,12) ) |((((step((transpose(arpeggio(X) ,-7) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ,12) +((X+transpose((X|shuffle(X) ) ,4) ) +transpose((X|transpose(arpeggio(X) ,-5) ) ,7) ) ) |step((X+(X+transpose(X,12) ) ) ,12) ) +transpose(((transpose(transpose(X,-7) ,4) |((X+X) |X) ) |transpose(transpose(transpose((X|X) ,-5) ,-7) ,-5) ) ,4) ) +transpose(transpose(((transpose(X,-7) +transpose(step(((shuffle((X+X) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ,7) ) +transpose(echo((echo(transpose(X,4) ,4,6) +transpose(((transpose(X,-7) |echo(X,4,6) ) +transpose(transpose((X+X) ,-5) ,12) ) ,-7) ) ,4,6) ,7) ) ,-7) ,7) ) ) +transpose(step((transpose(transpose(step(transpose(((X|X) +(X+X) ) ,-7) ,12) ,4) ,-7) |(transpose(shuffle((echo(X,4,6) +transpose(transpose(X,-5) ,12) ) ) ,-5) |transpose((transpose((X+transpose(X,12) ) ,-5) +(step(X,12) +(X|X) ) ) ,-7) ) ) ,12) ,7) ) ,4) ,7) ) +transpose(((transpose((((transpose(transpose(transpose(arpeggio(echo(X,4,6) ) ,-5) ,-7) ,4) +transpose(((X+transpose(X,12) ) +(echo(transpose(X,-5) ,4,6) +shuffle(transpose(X,-5) ) ) ) ,12) ) +transpose((arpeggio(transpose(echo(X,4,6) ,-7) ) |((transpose(transpose(X,-5) ,4) |((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ) |transpose(echo(X,4,6) ,4) ) ) ,4) ) +transpose(transpose(arpeggio(transpose(((step(echo(X,4,6) ,12) |transpose((X|X) ,4) ) +transpose(X,12) ) ,-7) ) ,-7) ,7) ) ,4) |((step(transpose(((step(arpeggio(X) ,12) +transpose(transpose(transpose(X,-5) ,4) ,7) ) +transpose(step(step(X,12) ,12) ,-7) ) ,-7) ,12) |(step(((X+transpose(echo(X,4,6) ,12) ) +transpose((echo(echo(shuffle(X) ,4,6) ,4,6) +(transpose(X,4) +(X+transpose(X,12) ) ) ) ,7) ) ,12) +transpose(step((echo((echo(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,-5) ,4,6) +transpose((X|X) ,4) ) ,4,6) |transpose((transpose(X,-5) |(X+echo(X,4,6) ) ) ,-7) ) ,12) ,12) ) ) +transpose(((transpose((step(arpeggio(X) ,12) +transpose((transpose(transpose(X,-7) ,4) +X) ,12) ) ,4) +transpose(transpose((shuffle(step(X,12) ) |transpose(transpose(X,-5) ,-7) ) ,4) ,7) ) +(((transpose(((shuffle(X) +transpose((X|X) ,4) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose(transpose(X,-7) ,7) ) ,7) ) ,4) +transpose(((((X+X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(step(X,12) ,4) ) ,4) ) +transpose((transpose(((transpose(X,-7) +X) +transpose((X|X) ,7) ) ,-7) +transpose(((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(X,-5) ,12) ) ,7) ) ,7) ) +echo(transpose((X+transpose(X,12) ) ,4) ,4,6) ) ) ,-5) ) ) +transpose(((transpose(((((transpose((transpose(X,-7) |X) ,4) +transpose(((X|X) +(X+transpose(X,12) ) ) ,-7) ) +(((((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) |transpose(transpose(X,4) ,4) ) +transpose((transpose(echo(step(X,12) ,4,6) ,-5) +transpose(X,4) ) ,7) ) +transpose((((X+transpose(X,7) ) +transpose((X|X) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) |X) ,12) ) ,7) ) ) +transpose((transpose((transpose(step(((X+X) +transpose(transpose(X,-7) ,7) ) ,12) ,-7) +transpose((shuffle(step(X,12) ) |transpose(arpeggio((X+X) ) ,-7) ) ,7) ) ,4) +transpose(transpose(transpose(transpose(echo(X,4,6) ,-7) ,4) ,-7) ,12) ) ,7) ) +transpose((arpeggio(((transpose(X,4) +X) +transpose((transpose((X+X) ,4) +transpose(transpose(X,4) ,7) ) ,12) ) ) +((arpeggio(transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ) +transpose(((X+X) +transpose(X,7) ) ,-5) ) +transpose(((echo(transpose((X+transpose(step(X,12) ,12) ) ,-7) ,4,6) +transpose((transpose(transpose((X|X) ,-5) ,-7) |(arpeggio(X) +transpose(echo(X,4,6) ,7) ) ) ,4) ) +transpose(transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) ,7) ) ,7) ) ) ,7) ) ,-7) |(transpose(transpose((step((step(transpose(X,4) ,12) +((arpeggio((transpose(X,-7) +transpose(X,12) ) ) +transpose(step(X,12) ,4) ) +transpose(((X|X) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) ,12) +transpose(transpose(((((X|X) +transpose((transpose(transpose(X,-5) ,-5) +transpose(X,-5) ) ,7) ) +transpose((transpose(step(X,12) ,-7) |transpose(step(X,12) ,-7) ) ,4) ) +transpose(transpose(transpose(transpose(arpeggio((X+X) ) ,-5) ,-7) ,4) ,7) ) ,4) ,7) ) ,-7) ,-5) +transpose((echo(transpose(shuffle(arpeggio((X+X) ) ) ,4) ,4,6) +transpose((transpose(step(step(transpose(X,4) ,12) ,12) ,-7) |transpose(shuffle(transpose(((shuffle(X) +transpose((transpose(((X|X) +transpose(transpose(X,-5) ,12) ) ,-5) +transpose(shuffle(X) ,-7) ) ,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ,4) ) ,4) ) ,12) ) ,7) ) ) +((arpeggio(((arpeggio(step(transpose(X,4) ,12) ) +(transpose(transpose(shuffle((X+transpose(X,7) ) ) ,-5) ,-7) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ) +transpose((transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,12) ) ,4) ) ) +transpose(transpose((((transpose(shuffle(arpeggio(X) ) ,-5) +transpose(transpose(echo(transpose((shuffle((transpose(X,4) +transpose(transpose(X,4) ,4) ) ) +transpose(((transpose(X,4) +transpose((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,12) ) ,-7) ,4,6) ,-7) ,12) ) +transpose((transpose((((transpose(X,-5) |X) |X) +(((X+X) +transpose(transpose(X,-5) ,7) ) +step(transpose(transpose(X,4) ,-5) ,12) ) ) ,-7) |((transpose((transpose(transpose(X,-7) ,-7) |transpose(X,-5) ) ,4) |(shuffle((X+transpose((X+transpose(X,12) ) ,7) ) ) |(((X|transpose(X,-5) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ) +(transpose(((arpeggio(transpose(step(X,12) ,-7) ) +transpose(transpose(X,-5) ,4) ) |arpeggio(X) ) ,4) +(echo(transpose(step(transpose(X,-7) ,12) ,4) ,4,6) +transpose((((((X+transpose(X,12) ) |transpose(X,-5) ) +echo((X+transpose(X,12) ) ,4,6) ) |(step(arpeggio(X) ,12) +(X+X) ) ) |(transpose(transpose(X,-7) ,-5) +transpose(((X+transpose((X|X) ,7) ) +transpose((X+(X+X) ) ,7) ) ,12) ) ) ,12) ) ) ) ) ,4) ) +transpose(transpose((echo(((((X+transpose(X,4) ) +transpose(X,7) ) |transpose((X+X) ,-5) ) |(transpose(X,-7) +transpose(X,12) ) ) ,4,6) +transpose(echo(arpeggio((transpose(transpose(X,4) ,4) +transpose(((X|X) +(X+X) ) ,7) ) ) ,4,6) ,4) ) ,-7) ,7) ) ,-5) ,4) ) +transpose(arpeggio(transpose(((((transpose(step(X,12) ,-5) +transpose(shuffle(shuffle((X|X) ) ) ,4) ) +transpose(step(shuffle((X+transpose(X,12) ) ) ,12) ,7) ) |arpeggio(step(((transpose(((X+transpose(X,12) ) +step(X,12) ) ,4) +transpose((((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +step(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ) |(((transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,4) |(shuffle(X) +transpose(X,7) ) ) ,-7) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(((X+X) |echo(X,4,6) ) ,12) ) ,4) ) +transpose(transpose((X+transpose(step((X+transpose(X,12) ) ,12) ,12) ) ,-5) ,7) ) +(((((X+transpose(X,12) ) +transpose((step((X+transpose(X,7) ) ,12) +(X+transpose(X,7) ) ) ,4) ) +transpose((((transpose(X,4) +(X+X) ) +transpose(((X+transpose(X,12) ) |X) ,7) ) +(((X+transpose(X,7) ) +transpose((shuffle(X) +transpose(X,-5) ) ,4) ) +transpose((arpeggio(X) +transpose(X,7) ) ,7) ) ) ,7) ) +transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) ) ,7) ) ) ,12) ) ,7) ) ,-5) ,-5) random seed used was 0

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