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((transpose(transpose(transpose((transpose(transpose(arpeggio(arpeggio(transpose(X,-5) ) ) ,-7) ,-5) +transpose(((((((X|X) +X) +transpose((X+X) ,12) ) +transpose(echo(transpose(shuffle(echo(X,4,6) ) ,-7) ,4,6) ,12) ) +transpose(transpose((step((X+(X+transpose(X,12) ) ) ,12) +transpose((X+(X+transpose(X,12) ) ) ,7) ) ,-7) ,4) ) +transpose(transpose(transpose((X|((X+X) +transpose(X,12) ) ) ,-5) ,-5) ,7) ) ,12) ) ,-7) ,-7) ,-7) +transpose((transpose(shuffle((transpose((((shuffle(arpeggio(transpose(step(X,12) ,-5) ) ) +transpose(echo(transpose(transpose(arpeggio((X+transpose(X,4) ) ) ,4) ,-7) ,4,6) ,12) ) +transpose(shuffle(arpeggio(step(transpose((shuffle(echo(X,4,6) ) +transpose(transpose((((X+transpose(X,7) ) |X) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,4) ,12) ) ,-5) ,12) ) ) ,4) ) +transpose(arpeggio(echo((shuffle((((arpeggio(X) |X) +transpose(transpose(X,-5) ,12) ) +shuffle(step((X|X) ,12) ) ) ) +transpose(transpose(((step(X,12) +transpose(((((X+X) +transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose(transpose(shuffle(transpose(X,-5) ) ,-7) ,7) ) ,-7) ,7) ) ,4,6) ) ,7) ) ,-5) +transpose((((((((X+transpose(X,12) ) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose((echo(X,4,6) +transpose((X+transpose(echo(X,4,6) ,7) ) ,12) ) ,7) ) |(arpeggio(transpose(X,-7) ) |(X+((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ) ) ) +transpose(shuffle(transpose(step(((X+transpose(X,7) ) +transpose(X,-5) ) ,12) ,-5) ) ,12) ) +transpose((transpose(transpose(transpose(transpose(shuffle(X) ,4) ,-5) ,-7) ,4) +transpose(((transpose(arpeggio(transpose(transpose(arpeggio(step(X,12) ) ,4) ,-5) ) ,-7) +transpose(echo(shuffle(echo((X+X) ,4,6) ) ,4,6) ,4) ) +transpose(transpose((shuffle((transpose(X,-7) |transpose(X,-5) ) ) +transpose(transpose(arpeggio(transpose(X,-7) ) ,-5) ,12) ) ,-5) ,7) ) ,12) ) ,7) ) +transpose(transpose(step((shuffle(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ) ) +transpose((shuffle(transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(step(transpose(transpose(arpeggio(X) ,4) ,4) ,12) ,7) ) ,7) ) ,12) ,-7) ,12) ) ,12) ) ) ,-5) |transpose(step((((((transpose(((X+transpose(((transpose(X,-5) +transpose(X,12) ) +arpeggio(X) ) ,4) ) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,7) ) ,-5) +transpose(step(((((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) +((X+transpose(X,7) ) +transpose((X+X) ,12) ) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ,12) ,-7) ) +(((transpose((step(X,12) |step(transpose(X,-5) ,12) ) ,-7) +transpose(transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ,-7) ,4) ) +transpose(((transpose(X,-5) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) +transpose(((((transpose(X,-7) +transpose(((transpose(X,4) +transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) +transpose((arpeggio(X) +transpose((X+transpose(step(X,12) ,12) ) ,12) ) ,7) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,12) ) +transpose(shuffle(transpose(shuffle(shuffle(X) ) ,-5) ) ,4) ) +transpose(transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-5) ,7) ) ,4) ) +transpose(transpose(transpose(transpose((X|X) ,-5) ,-5) ,-5) ,7) ) ,7) ) ) +transpose(transpose(echo(step(transpose((((X+transpose(X,12) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ,12) ) +transpose(transpose((transpose(X,4) +transpose(transpose(X,-5) ,12) ) ,-7) ,12) ) ,-5) ,12) ,4,6) ,-7) ,7) ) +transpose(((transpose(echo(transpose(X,-7) ,4,6) ,-7) +transpose((((((((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(((X|transpose(X,-5) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,7) ) +echo(arpeggio(X) ,4,6) ) +transpose(transpose(transpose((((transpose((X+X) ,-7) +transpose(transpose(X,-7) ,12) ) +transpose(step(transpose(X,-7) ,12) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) ,-5) ,-7) ,12) ) +transpose(((transpose((transpose(X,-7) +transpose(step(step(arpeggio(X) ,12) ,12) ,12) ) ,4) +transpose((transpose((X+transpose(transpose(X,-7) ,12) ) ,-7) +transpose(((step(transpose(X,-5) ,12) +transpose(X,7) ) |transpose(arpeggio((X+transpose(X,12) ) ) ,-5) ) ,12) ) ,-7) ) +transpose(arpeggio(arpeggio(transpose((((step((X|X) ,12) |echo(arpeggio(transpose(X,-5) ) ,4,6) ) +transpose(transpose(step(step(X,12) ,12) ,-7) ,4) ) +transpose(transpose((transpose(X,-5) +(X+transpose(arpeggio(X) ,7) ) ) ,-5) ,7) ) ,-5) ) ) ,12) ) ,4) ) +transpose(echo((echo(transpose((transpose(X,-5) +transpose(arpeggio(X) ,7) ) ,-5) ,4,6) |transpose(((transpose(X,4) +step(transpose(transpose(X,-7) ,4) ,12) ) +transpose(((transpose(X,4) +(X+transpose(X,7) ) ) +transpose(transpose(X,-5) ,4) ) ,7) ) ,-5) ) ,4,6) ,7) ) ,4) ) +transpose(((shuffle(shuffle((echo(((step(X,12) +transpose((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((echo(X,4,6) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4,6) +transpose((echo(transpose((transpose(X,-5) +transpose(X,12) ) ,-7) ,4,6) +echo((X|X) ,4,6) ) ,7) ) ) ) +transpose(transpose(shuffle(transpose(transpose(transpose(X,4) ,-7) ,-7) ) ,-7) ,4) ) +transpose(step(transpose(((echo(X,4,6) +transpose(step(transpose((X+transpose(X,12) ) ,-5) ,12) ,12) ) +transpose((((transpose(X,-5) +transpose((transpose(X,-7) +transpose((X|X) ,12) ) ,7) ) +transpose(arpeggio(step(X,12) ) ,12) ) +(arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) ,4) ,12) ,7) ) ,7) ) ,4) ) +transpose(echo((transpose(step(echo(transpose(arpeggio(X) ,-7) ,4,6) ,12) ,4) |(((transpose(arpeggio((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) ) ,-7) +transpose(shuffle(echo(transpose(transpose(X,-5) ,-5) ,4,6) ) ,4) ) +transpose(transpose((transpose((transpose(X,-7) |step(X,12) ) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,-5) ,7) ) +(transpose(transpose(transpose(X,-7) ,4) ,-5) +transpose(step(echo(shuffle((X+(X+transpose(X,12) ) ) ) ,4,6) ,12) ,-5) ) ) ) ,4,6) ,7) ) ,12) ,-7) ) ,12) ) ) ,-7) random seed used was 17539 EXPR = ((((arpeggio((shuffle(transpose(transpose(transpose(shuffle((echo(X,4,6) +transpose((echo(X,4,6) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) ,-7) ,-7) ,4) ) |transpose(transpose(shuffle(step(((X+(X+X) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,12) ) ,-5) ,-7) ) ) +(transpose(transpose(transpose(transpose((echo((transpose(step(transpose(X,4) ,12) ,-7) +transpose(transpose(transpose(shuffle(X) ,-7) ,-7) ,12) ) ,4,6) +transpose(transpose(((transpose((X+transpose(X,7) ) ,4) +transpose((transpose(arpeggio(X) ,-5) +transpose((((X+transpose(X,12) ) +X) +transpose(shuffle((X|X) ) ,7) ) ,7) ) ,4) ) +transpose(((((X+transpose(X,12) ) +transpose((X+X) ,12) ) +transpose(transpose(X,-5) ,12) ) +transpose((step(X,12) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,12) ) ,7) ) ,4) ,12) ) ,-7) ,4) ,-5) ,-7) +(step(transpose(transpose(((transpose(transpose(echo(transpose(transpose(transpose((X|X) ,-5) ,-7) ,-5) ,4,6) ,-7) ,-5) +transpose(echo(transpose(transpose(transpose(shuffle(X) ,-5) ,-7) ,4) ,4,6) ,4) ) +transpose(transpose(transpose((transpose(X,4) +((X+transpose(transpose(X,-7) ,4) ) +transpose(step(X,12) ,7) ) ) ,-5) ,-7) ,7) ) ,-7) ,-7) ,12) |((transpose(step(((((step(X,12) +transpose((step(X,12) +transpose(step(transpose(X,-5) ,12) ,12) ) ,12) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) +transpose((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) ,7) ) +transpose(transpose(arpeggio(shuffle((step(X,12) +transpose(((step(X,12) +transpose(transpose(X,-5) ,12) ) |echo((X+X) ,4,6) ) ,12) ) ) ) ,4) ,7) ) ,12) ,-5) |(echo(((echo(transpose(echo(step(transpose(X,-5) ,12) ,4,6) ,-7) ,4,6) |transpose(((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose((transpose(transpose(X,-5) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,-7) ) +echo(echo(((step(X,12) +transpose(arpeggio(X) ,7) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ,4,6) ) ,4,6) +transpose((step(transpose(arpeggio(shuffle(X) ) ,-7) ,12) +transpose(shuffle((echo(X,4,6) +transpose(transpose(X,4) ,12) ) ) ,-5) ) ,12) ) ) |((transpose(((shuffle(arpeggio(arpeggio((arpeggio(X) +transpose((X+transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,12) ,7) ) ,7) ) ) ) ) +transpose(echo(echo(shuffle((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |(X+X) ) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ,7) ) ) ,4,6) ,4,6) ,4) ) +transpose(step((arpeggio(arpeggio(echo(X,4,6) ) ) +transpose((transpose(transpose(step(X,12) ,-5) ,-7) +(transpose(X,-7) +transpose(X,12) ) ) ,7) ) ,12) ,7) ) ,-5) +transpose(transpose(arpeggio(arpeggio(transpose(transpose(echo(X,4,6) ,-7) ,-7) ) ) ,-7) ,4) ) +transpose(((arpeggio((transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) +transpose(transpose(transpose(shuffle(transpose(((shuffle(X) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) ,-5) ) ,-5) ,4) ,12) ) +transpose((transpose((transpose(transpose(arpeggio(step(X,12) ) ,-5) ,4) |transpose((transpose(X,-7) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) ,-7) ) ,4) +transpose(transpose(step(echo(shuffle(transpose(transpose(X,-7) ,4) ) ,4,6) ,12) ,-7) ,7) ) ,7) ) ,7) ) ) ) ) ) +transpose(shuffle(((transpose(((transpose((((X+transpose(X,7) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) +transpose(((arpeggio(X) |transpose(X,-5) ) +transpose((transpose((X+transpose(X,12) ) ,-7) |echo(((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ) ,7) ) ,7) ) ,-7) +transpose(transpose(echo(transpose((transpose(transpose(transpose(X,-5) ,-5) ,-7) +transpose(transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-5) ,12) ) ,-7) ,4,6) ,-5) ,4) ) +transpose((shuffle((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) ,-5) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +((X+transpose(X,12) ) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,7) ) ) ,12) ) ) +transpose(transpose(arpeggio((echo(X,4,6) +(transpose(X,-7) +(X+transpose(X,7) ) ) ) ) ,-7) ,12) ) ,7) ) ,-7) +transpose(step((transpose(step((transpose((((X|X) +transpose((X+transpose(X,7) ) ,12) ) +transpose(((transpose(X,4) +transpose(echo(step(X,12) ,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,-7) +transpose(((((transpose(X,-5) +transpose((((X+transpose(X,7) ) +transpose((X+X) ,7) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(shuffle(transpose(arpeggio(X) ,-5) ) ,7) ) +transpose((X+arpeggio(X) ) ,-7) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ,-5) ) ,12) ,-7) |transpose(transpose(step((transpose(step(step(X,12) ,12) ,-7) +transpose(transpose(transpose((transpose(X,-5) +X) ,-7) ,4) ,7) ) ,12) ,-7) ,-7) ) ,12) ,4) ) +transpose(transpose(shuffle(((transpose(step(arpeggio(transpose((arpeggio(X) |transpose((((X+X) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ) ,-5) ) ,12) ,-7) +transpose((transpose((arpeggio((X+transpose(X,7) ) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose((X+X) ,-5) ) ,7) ) ,-7) +transpose(((transpose(((transpose(X,-7) +(arpeggio(X) +transpose(X,7) ) ) +transpose(transpose(X,-5) ,12) ) ,-7) +transpose(transpose(arpeggio(transpose(echo(transpose(X,-5) ,4,6) ,-7) ) ,4) ,4) ) +transpose((transpose(((step(((step(X,12) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) +transpose(shuffle(X) ,4) ) +transpose(arpeggio((X+X) ) ,7) ) ,-5) +transpose(((transpose((X+transpose(X,-5) ) ,-5) +transpose(transpose(transpose(step((X+transpose(X,12) ) ,12) ,-7) ,-7) ,12) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(echo(arpeggio(transpose(transpose(((X+transpose(transpose(X,-7) ,7) ) +transpose((((X+transpose(X,12) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,12) ) ,-7) ,-5) ) ,4,6) ,7) ) ) ,-5) ,7) ) ) ,7) ) +transpose(transpose(step(((shuffle(((shuffle(transpose(((X|X) +transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ,7) ) ,4) ) +transpose((step(((X+transpose(shuffle(X) ,4) ) +transpose((step(X,12) |transpose(X,-5) ) ,7) ) ,12) +((echo((X|X) ,4,6) +transpose((echo(X,4,6) +(X+transpose(X,7) ) ) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ) ,7) ) +transpose(arpeggio((transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) |echo(echo(transpose(step(X,12) ,4) ,4,6) ,4,6) ) ) ,12) ) ) +transpose(shuffle(echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) ) ,12) ) |((((arpeggio(transpose(shuffle(X) ,-5) ) +transpose(transpose((((((X+X) +transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(((X+shuffle(X) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ,7) ) ,4) ,7) ) |(((transpose(shuffle(arpeggio(shuffle((X+transpose(X,12) ) ) ) ) ,-5) |echo((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ) +transpose(((transpose((echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) +transpose(step(echo((X|X) ,4,6) ,12) ,7) ) ,4) +transpose(transpose((transpose(((X+transpose(X,12) ) +transpose(shuffle(X) ,7) ) ,-5) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(shuffle(X) ,7) ) ,12) ) ,-7) ,4) ) +transpose(arpeggio(transpose(((X+transpose(X,7) ) +transpose(step(X,12) ,7) ) ,-7) ) ,7) ) ,4) ) +transpose(echo(shuffle(transpose((((X|X) +transpose((X+transpose(X,12) ) ,12) ) +transpose(X,7) ) ,-7) ) ,4,6) ,7) ) ) +transpose(echo(transpose(step(X,12) ,-7) ,4,6) ,4) ) +transpose(step(((((arpeggio((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose((arpeggio(X) +shuffle(X) ) ,7) ) ) |transpose(arpeggio(arpeggio((X+transpose(X,12) ) ) ) ,-5) ) +transpose((X+transpose(transpose(((X+transpose(X,7) ) +transpose((X+X) ,4) ) ,-7) ,7) ) ,7) ) +transpose((arpeggio((transpose(X,-5) +transpose(transpose(shuffle(X) ,4) ,7) ) ) +(((((X+transpose(X,12) ) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose((X|X) ,7) ) +transpose(step(transpose((X|X) ,-7) ,12) ,12) ) +((transpose(X,-7) +transpose(shuffle((X|X) ) ,7) ) +transpose(transpose(transpose(transpose(X,4) ,-7) ,4) ,12) ) ) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,12) ,7) ) ) ,12) ,-7) ,12) ) +transpose(((((transpose(((((((X+transpose(X,12) ) +transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((((X+transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) ,7) ) +transpose((transpose((((X+transpose(X,12) ) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,-5) +transpose(arpeggio(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +arpeggio(shuffle(X) ) ) ) ,7) ) ,12) ) +arpeggio((X+transpose(X,7) ) ) ) ,-7) +transpose(echo(((transpose(((X+transpose(X,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,7) ) ,-5) +transpose(transpose(arpeggio(step(transpose(X,-7) ,12) ) ,-7) ,12) ) |arpeggio(transpose(echo(((((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) |transpose((X+transpose(X,7) ) ,-5) ) +(X+transpose(X,7) ) ) ,4,6) ,-5) ) ) ,4,6) ,12) ) +transpose(step(echo((transpose((X|step(echo(X,4,6) ,12) ) ,-7) |transpose(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(shuffle(X) ,12) ) |shuffle(((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) ) ,4) ) ,4,6) ,12) ,7) ) |(transpose(step(((arpeggio(((step(transpose(((transpose(X,-5) +transpose(X,12) ) |transpose(step(X,12) ,-7) ) ,-5) ,12) +transpose((((arpeggio(transpose(transpose(X,-5) ,-7) ) +X) +transpose((X+transpose(((X|X) +transpose(shuffle(step(X,12) ) ,12) ) ,7) ) ,4) ) +transpose((((step(X,12) +transpose(X,12) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,12) ) +transpose(step((transpose(X,-7) +X) ,12) ,12) ) ,7) ) ,4) ) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,4) ,7) ) ) +transpose(((arpeggio(shuffle(((transpose(X,-5) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ) ) +transpose(arpeggio(echo((X+transpose(X,12) ) ,4,6) ) ,4) ) +transpose((shuffle((((X+transpose(arpeggio(X) ,7) ) +transpose(X,-5) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ) +transpose((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ) ,7) ) ,12) ) +transpose(shuffle((echo((arpeggio((shuffle(X) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ) +shuffle((X+transpose(echo(X,4,6) ,12) ) ) ) ,4,6) +((echo(X,4,6) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,12) ) +transpose(((echo(X,4,6) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose(step((arpeggio((X+transpose(X,12) ) ) +(arpeggio(X) +transpose(transpose(X,4) ,7) ) ) ,12) ,7) ) ,7) ) ) ) ,7) ) ,12) ,4) +transpose(transpose(((transpose(transpose((echo(((((transpose(X,-7) +transpose(X,7) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) +transpose(echo((transpose(transpose(transpose(shuffle(step(X,12) ) ,-7) ,-5) ,-7) +transpose(shuffle((arpeggio(X) |transpose(X,-7) ) ) ,12) ) ,4,6) ,12) ) ,-5) ,-5) +transpose((transpose((((arpeggio(step(transpose((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ,-7) ,12) ) +transpose(step(arpeggio(transpose((X+transpose(X,12) ) ,4) ) ,12) ,12) ) +transpose((shuffle(arpeggio(echo(transpose(X,-5) ,4,6) ) ) +transpose(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-7) ,12) ) ,4) ) +transpose(echo(transpose(transpose(transpose(X,-7) ,-7) ,-7) ,4,6) ,7) ) ,-5) +transpose(step(shuffle(transpose(transpose(((transpose(X,-5) +transpose(X,12) ) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) ,-5) ,-5) ) ,12) ,-5) ) ,4) ) +transpose(((transpose(arpeggio(((transpose((transpose(X,-5) +transpose(transpose(X,-5) ,-7) ) ,-7) |echo(step(X,12) ,4,6) ) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(echo(X,4,6) ,12) ) ,7) ) ) ,-5) +(transpose(X,-7) |transpose(echo((X|(transpose(step(X,12) ,4) +shuffle(echo(X,4,6) ) ) ) ,4,6) ,-5) ) ) +transpose(((transpose(echo((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) |transpose(echo(shuffle(X) ,4,6) ,4) ) ,4,6) ,-7) +transpose(transpose((transpose((echo(X,4,6) +transpose(X,12) ) ,-5) +(arpeggio(((X+transpose(((transpose(X,-5) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) +transpose(shuffle(shuffle(transpose(X,-5) ) ) ,12) ) ) ,-7) ,7) ) +transpose(transpose((((arpeggio(transpose(transpose(X,4) ,-5) ) +transpose(arpeggio(transpose(shuffle(X) ,-5) ) ,4) ) +transpose(((transpose(transpose(shuffle(transpose(X,-5) ) ,-7) ,-7) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(shuffle(step(shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) ,12) ) ,7) ) ,7) ) +transpose(transpose(((echo(shuffle(X) ,4,6) +transpose(((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(((X+X) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,12) ) ,4) ,7) ) ,7) ) ,7) ) ,-7) ,12) ) ) +transpose(transpose(transpose(((step(echo(transpose(arpeggio((transpose((step((X|X) ,12) |transpose(X,-5) ) ,-5) +transpose((step((X+transpose(X,7) ) ,12) |X) ,12) ) ) ,-7) ,4,6) ,12) +transpose(step(shuffle(transpose(transpose((transpose(transpose(X,-5) ,-7) +transpose(((echo((X+transpose((X+transpose(X,12) ) ,12) ) ,4,6) +transpose((step(step(X,12) ,12) +((transpose(X,-5) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose(((echo(shuffle(X) ,4,6) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,7) ) ,12) ) ,4) ,-5) ) ,12) ,4) ) +transpose(((transpose(transpose(shuffle(step(X,12) ) ,-5) ,-7) +transpose(((transpose(step(X,12) ,-5) +transpose(shuffle(step(shuffle(echo(X,4,6) ) ,12) ) ,7) ) |((transpose((((((echo(step(X,12) ,4,6) +transpose((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) +transpose(((X+transpose(transpose(X,-5) ,12) ) +transpose(((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) |((echo(X,4,6) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) +transpose(transpose(((transpose(X,-5) +transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,7) ) +transpose((X+X) ,12) ) ,7) ) ,-7) ,7) ) ,-7) +transpose((((((echo(transpose(X,-7) ,4,6) |transpose(X,-7) ) +transpose(((transpose(step(X,12) ,-5) +transpose(transpose(arpeggio(X) ,-7) ,7) ) +(((step(X,12) +transpose(X,-7) ) +((arpeggio(X) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose(((X+transpose(X,7) ) +transpose((X|X) ,7) ) ,4) ) ) ,12) ) +transpose(transpose((step(echo(arpeggio(X) ,4,6) ,12) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,7) ) ,-7) ,4) ) +transpose(echo(((shuffle(transpose((X+transpose(X,7) ) ,-7) ) +transpose(X,7) ) +transpose(transpose(transpose(shuffle(X) ,-5) ,4) ,7) ) ,4,6) ,7) ) +transpose(transpose((((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) +transpose(((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) |transpose((X|X) ,-5) ) ,12) ) ,-5) ,12) ) ,4) ) +transpose((transpose(transpose(step(((echo(X,4,6) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ,-7) ,-7) +transpose(echo(echo(transpose(transpose(echo(X,4,6) ,-7) ,-7) ,4,6) ,4,6) ,12) ) ,7) ) ) ,4) ) +transpose((echo(((transpose(echo(X,4,6) ,-7) +transpose(echo((X+((transpose((X+transpose(X,12) ) ,-5) +transpose((X+transpose(arpeggio(X) ,12) ) ,4) ) +transpose((X+arpeggio(X) ) ,7) ) ) ,4,6) ,12) ) +arpeggio(transpose(transpose(X,-7) ,4) ) ) ,4,6) +transpose(transpose(((transpose(shuffle(((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) ,-5) +transpose(step(((X+transpose(transpose(step(X,12) ,-5) ,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) ,12) ,12) ) +step(step(step(transpose(step(X,12) ,-7) ,12) ,12) ,12) ) ,4) ,12) ) ,7) ) ,7) ) ,-5) ,-7) ,7) ) ,7) ) random seed used was 0 NOTE: Generated phrase was too large ( 7425 ) , it has been truncated at 5000 notes. EXPR = transpose(transpose((step(shuffle(step((((transpose(shuffle(transpose(transpose(((transpose(shuffle((X+transpose(echo(X,4,6) ,7) ) ) ,-5) +transpose(shuffle((transpose(step(X,12) ,4) |((transpose(X,-5) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,4) ) +transpose(echo(transpose(((((X|X) +transpose(arpeggio(X) ,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,-5) ,4,6) ,7) ) ,-5) ,-7) ) ,-5) +transpose(transpose(step((transpose(transpose(shuffle(transpose(transpose(X,-7) ,-7) ) ,-7) ,-7) +transpose(arpeggio(transpose(arpeggio((X+transpose(shuffle(X) ,7) ) ) ,-7) ) ,12) ) ,12) ,-7) ,4) ) +transpose(transpose(transpose(echo((step(transpose(X,-7) ,12) +transpose((step(X,12) +(X|X) ) ,12) ) ,4,6) ,-7) ,-7) ,7) ) +transpose(shuffle((arpeggio(transpose(transpose((((X+transpose(X,12) ) +transpose(transpose(shuffle((X|X) ) ,-5) ,12) ) |(arpeggio(X) |X) ) ,-5) ,-7) ) +transpose(shuffle((transpose(step(transpose(transpose(X,-5) ,-5) ,12) ,-7) +shuffle((transpose(X,-5) +transpose((X+transpose(transpose(X,-5) ,7) ) ,12) ) ) ) ) ,12) ) ) ,7) ) ,12) ) ,12) |(((transpose(step(((((arpeggio(step(arpeggio(X) ,12) ) +transpose((echo(((echo(X,4,6) +transpose(X,7) ) +transpose(X,-7) ) ,4,6) +transpose(transpose(step(step((X+transpose(X,7) ) ,12) ,12) ,-7) ,12) ) ,7) ) +transpose(((transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose((((((X|X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(step((X|X) ,12) ,7) ) ,12) ) ,-5) +transpose(echo(transpose(transpose(X,-7) ,-7) ,4,6) ,12) ) +(step((shuffle((X+X) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ,12) +transpose(transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,-7) ) ) ,7) ) +transpose((transpose(step(arpeggio(X) ,12) ,-5) +transpose(((((transpose(X,-5) +transpose(shuffle(((X+transpose(X,12) ) +X) ) ,7) ) +transpose(shuffle(X) ,7) ) +transpose((echo(X,4,6) +echo((X+X) ,4,6) ) ,12) ) +transpose(step(((arpeggio(X) +transpose(arpeggio(transpose(transpose(X,-7) ,-5) ) ,7) ) +transpose(X,-7) ) ,12) ,12) ) ,7) ) ,4) ) +transpose(transpose((((arpeggio((transpose(transpose(X,4) ,-7) |transpose(transpose(X,-5) ,-7) ) ) +transpose(shuffle(X) ,7) ) +transpose(arpeggio(((X+transpose(X,12) ) +transpose(transpose(shuffle(X) ,-7) ,12) ) ) ,4) ) +transpose((((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) |(X+transpose(X,7) ) ) +transpose((echo((X+transpose(transpose(X,4) ,12) ) ,4,6) |(X|transpose(X,-7) ) ) ,7) ) ,7) ) ,-5) ,7) ) ,12) ,-5) |((echo(echo(((transpose(shuffle(((transpose(step(X,12) ,-7) |(shuffle(transpose(X,-7) ) |(X|X) ) ) +((arpeggio(X) +transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose(X,-5) ,7) ) ) ) ,4) +transpose((shuffle(transpose(shuffle(echo((X+transpose(echo(X,4,6) ,7) ) ,4,6) ) ,-5) ) +transpose(shuffle(arpeggio(((transpose(X,4) +transpose(arpeggio(((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ) ) ,12) ) ,4) ) +transpose(arpeggio(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |(((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose(shuffle(X) ,7) ) +transpose((X|X) ,12) ) ) ,-5) ) ,7) ) ,4,6) ,4,6) +transpose((transpose(transpose((echo(step(((((transpose(arpeggio(X) ,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) +transpose(transpose(X,4) ,7) ) +transpose((((X+X) |transpose(transpose(X,-7) ,-5) ) +transpose(step(X,12) ,-5) ) ,12) ) ,12) ,4,6) +((transpose(X,4) |X) +transpose(shuffle(((transpose(transpose((X|X) ,-5) ,-5) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) +transpose(((transpose(transpose(echo(X,4,6) ,-7) ,-5) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,7) ) ) ,12) ) ) ,-7) ,4) +(transpose(transpose(((transpose((step(arpeggio((X+transpose(X,12) ) ) ,12) +transpose(transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(echo(((X+transpose(X,12) ) +transpose(X,12) ) ,4,6) ,12) ) ,-7) ,12) ) ,4) +transpose((arpeggio((((X+transpose(X,12) ) +transpose((((X+transpose(step((X+transpose(X,7) ) ,12) ,12) ) +(arpeggio((X|X) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ) |((X+transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,12) ) +(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose((shuffle(X) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ,12) ) ) ) +transpose(arpeggio(((((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(step(X,12) ,-5) ,7) ) +transpose(shuffle(arpeggio(echo(step(X,12) ,4,6) ) ) ,12) ) +(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) +transpose(shuffle(shuffle(X) ) ,-5) ) ) ) ,12) ) ,4) ) +transpose(transpose(shuffle(transpose(((X+(X+transpose(X,12) ) ) +transpose((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(arpeggio(echo(X,4,6) ) ,12) ) ,7) ) ,-7) ) ,-7) ,7) ) ,-7) ,-5) +transpose(shuffle(transpose(arpeggio(transpose(shuffle((arpeggio(((((shuffle(X) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(transpose(X,-5) ,12) ) ) ,-5) ) ,-7) ) ,7) ) ) ,4) ) +transpose(echo((step(arpeggio(transpose((((arpeggio(X) +(X|X) ) +X) +transpose(step((transpose(X,-5) +arpeggio(transpose(X,4) ) ) ,12) ,12) ) ,-5) ) ,12) +transpose(((((echo((step(X,12) +transpose(echo(X,4,6) ,12) ) ,4,6) |(step(transpose(transpose(X,-5) ,-5) ,12) +((X+transpose(X,7) ) +transpose(shuffle(X) ,12) ) ) ) +transpose(((step(((X+transpose(X,7) ) +(X+X) ) ,12) +transpose(((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ,7) ) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,12) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) +transpose((transpose((((arpeggio(X) +transpose(X,7) ) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,-7) +transpose(((shuffle(X) +transpose(((transpose(transpose(X,-5) ,-5) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,7) ) ,4,6) ,7) ) ) +transpose(arpeggio((arpeggio(transpose(transpose(transpose(arpeggio(shuffle(((((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) +transpose((X+transpose(echo(X,4,6) ,12) ) ,4) ) +transpose(step(X,12) ,7) ) ) ) ,-7) ,-5) ,-5) ) +transpose(transpose(shuffle(((transpose(X,-5) +transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ) ,-5) ,7) ) ) ,4) ) +transpose(transpose(((((transpose(shuffle(shuffle(X) ) ,-7) +echo(arpeggio(transpose(X,4) ) ,4,6) ) +transpose((transpose(transpose((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) +transpose(transpose(X,4) ,12) ) ,-5) ,-5) +transpose(echo(transpose((step((echo(X,4,6) +transpose(X,12) ) ,12) +transpose(((arpeggio(X) +transpose(X,7) ) +transpose((step(X,12) |arpeggio(arpeggio(X) ) ) ,12) ) ,7) ) ,4) ,4,6) ,12) ) ,12) ) |step(transpose(transpose(((shuffle(shuffle(X) ) +transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((X+X) ,7) ) ,-7) ,4) ,12) ) |step((echo(step(echo(X,4,6) ,12) ,4,6) +transpose(shuffle(((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) ,7) ) ,12) ) ,-5) ,7) ) ) ,-5) ,4) random seed used was 0 NOTE: Generated phrase was too large ( 6165 ) , it has been truncated at 5000 notes. EXPR = (shuffle(step(transpose(transpose(arpeggio(transpose((transpose(((((X+transpose(X,7) ) |arpeggio(X) ) +(((X+X) +transpose(echo(X,4,6) ,12) ) +transpose(step(step(transpose(X,-5) ,12) ,12) ,12) ) ) +transpose(transpose(transpose(transpose(((X|X) |shuffle(X) ) ,-7) ,-5) ,-5) ,7) ) ,-5) +transpose((step(transpose(X,4) ,12) +transpose((((transpose(echo(X,4,6) ,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose((X|X) ,7) ) ,7) ) +transpose((transpose(echo(X,4,6) ,-7) |X) ,7) ) ,7) ) ,-5) ) ,-5) ) ,-5) ,-5) ,12) ) +transpose(step(arpeggio(step(transpose(transpose(shuffle(shuffle(transpose(transpose((transpose((transpose(arpeggio((X+transpose(X,12) ) ) ,-5) +transpose(arpeggio(transpose(shuffle((transpose(X,-5) |X) ) ,-7) ) ,7) ) ,-5) +transpose((((shuffle(((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(((X+X) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) +transpose(echo(((X+transpose((X+transpose(X,12) ) ,7) ) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ,4,6) ,12) ) +transpose(transpose(transpose(echo(transpose(arpeggio(X) ,-5) ,4,6) ,4) ,-7) ,4) ) +transpose(transpose(((shuffle((X+transpose(transpose(X,4) ,7) ) ) |transpose(echo(shuffle(transpose(X,-5) ) ,4,6) ,-5) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,-7) ,7) ) ,7) ) ,4) ,-7) ) ) ,-5) ,-5) ,12) ) ,12) ,7) ) random seed used was 0

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