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(step(transpose(echo(echo(transpose((shuffle((((((X|(transpose(X,4) +transpose((X+transpose(X,12) ) ,7) ) ) +((arpeggio(arpeggio(X) ) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) |(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +(shuffle((X+transpose(X,7) ) ) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ) |transpose((transpose(X,-7) +(X|X) ) ,-5) ) +((transpose(transpose(step(X,12) ,4) ,-5) |transpose(X,-7) ) |transpose((X+transpose(X,7) ) ,-5) ) ) ) +transpose((((transpose((X+transpose(X,7) ) ,-5) +transpose(step((X+transpose(X,12) ) ,12) ,4) ) +(transpose((((transpose(shuffle(X) ,-5) +((X+X) |transpose(X,4) ) ) +transpose(echo(transpose(transpose(X,-5) ,-5) ,4,6) ,7) ) +transpose(shuffle(transpose((transpose(X,-5) +X) ,-7) ) ,7) ) ,4) +transpose(transpose((arpeggio(transpose(((transpose(X,-5) +transpose((arpeggio(X) +X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ) +step(step(transpose(X,4) ,12) ,12) ) ,4) ,7) ) ) |(transpose((((((X+transpose(X,7) ) +transpose((X+X) ,7) ) |transpose(X,4) ) +transpose((transpose(X,-7) |((X+X) +X) ) ,12) ) |transpose((arpeggio(transpose(X,-7) ) +transpose((((X+transpose(X,7) ) +transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,-7) ) ,-7) |transpose(shuffle(transpose(arpeggio(transpose(transpose(transpose(X,4) ,4) ,-7) ) ,-7) ) ,4) ) ) ,12) ) ,4) ,4,6) ,4,6) ,-5) ,12) ,-5) random seed used was 216648728 EXPR = (((shuffle((((transpose(((((X+X) +transpose(X,7) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ,4) +(transpose(shuffle(X) ,-5) +(transpose(X,4) +transpose(shuffle(X) ,7) ) ) ) |(transpose((X+transpose(X,12) ) ,4) +(((step(X,12) |shuffle(X) ) +transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(((shuffle((X+transpose(X,12) ) ) +transpose((X+transpose(X,12) ) ,-7) ) +transpose(((X+transpose((X|X) ,12) ) +transpose(X,-7) ) ,7) ) ,7) ) ) +transpose(step(((((transpose((step(X,12) +transpose(shuffle(transpose((X|X) ,-7) ) ,12) ) ,4) |transpose((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) ,-5) ) +transpose(echo((arpeggio((X+X) ) +transpose((transpose(transpose(X,-7) ,4) +transpose(transpose(X,4) ,7) ) ,12) ) ,4,6) ,4) ) +transpose((transpose(transpose((transpose(step((X|X) ,12) ,4) +(transpose(X,-5) +arpeggio(X) ) ) ,4) ,4) +((transpose(transpose((X+transpose(X,4) ) ,-7) ,-5) +transpose((echo(X,4,6) |(X|X) ) ,4) ) +transpose((transpose(arpeggio((X|X) ) ,-7) +transpose(((transpose(X,-5) |transpose(transpose(X,-5) ,-5) ) +transpose((transpose(transpose(X,4) ,4) |X) ,-5) ) ,12) ) ,7) ) ) ,7) ) |(transpose(transpose(transpose((step(X,12) |arpeggio(X) ) ,4) ,4) ,4) +arpeggio(shuffle(echo(X,4,6) ) ) ) ) ,12) ,4) ) +transpose(echo(echo(((transpose(((((X+X) +transpose(X,12) ) +transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,-5) ,4) ) +transpose(shuffle(step(X,12) ) ,7) ) ,4) +transpose(((transpose(X,-5) +transpose((((X+transpose((X+X) ,12) ) +transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(((echo((X|X) ,4,6) |transpose(X,-7) ) |((X+transpose(X,12) ) |(((X+transpose(X,12) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) ,7) ) ,12) ) +transpose(transpose(transpose((X+transpose(transpose(X,-5) ,12) ) ,-5) ,-5) ,-5) ) ,4,6) ,4,6) ,7) ) |(arpeggio(((arpeggio((X+transpose(X,12) ) ) +transpose(transpose((transpose(arpeggio(step(X,12) ) ,-7) +transpose((transpose(transpose(X,-5) ,-5) |arpeggio(transpose(echo(X,4,6) ,-5) ) ) ,7) ) ,-7) ,7) ) |(transpose((shuffle(step((X+X) ,12) ) +(X+transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ) ,-5) +transpose(transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,4) ,7) ) ) ) +transpose(((transpose(transpose((((((X+transpose(X,12) ) +transpose(X,12) ) |((X+transpose(X,12) ) +X) ) |transpose(((X+transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ,4) ) +((((X+transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) |transpose(transpose(X,-5) ,4) ) |((transpose(transpose(X,-5) ,4) +transpose(((X+transpose(X,12) ) +arpeggio(X) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ) ,-7) ,-7) |((transpose(arpeggio(X) ,-5) |arpeggio(X) ) +transpose((transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,12) ) ,12) ,-7) +(arpeggio(echo(X,4,6) ) +(transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) ) ) ,12) ) ) +transpose(echo((transpose((echo(transpose((X+transpose(X,12) ) ,4) ,4,6) +transpose(step(shuffle(shuffle(X) ) ,12) ,7) ) ,-5) +arpeggio((transpose(((((X+X) |transpose(X,-7) ) +transpose((arpeggio(X) +(X+X) ) ,4) ) +transpose((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-7) |step((echo(X,4,6) +transpose(X,4) ) ,12) ) ) ) ,4,6) ,12) ) ,7) ) ) random seed used was 0 EXPR = ((arpeggio(((transpose(transpose(arpeggio((X|X) ) ,4) ,-5) |((((arpeggio(transpose(shuffle(transpose(transpose(X,-7) ,-7) ) ,-7) ) +transpose(transpose(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,-7) ,-7) ) +echo(transpose((shuffle(X) +transpose(step(X,12) ,12) ) ,-7) ,4,6) ) +transpose(transpose((((((X|step(X,12) ) |transpose((X|X) ,4) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +X) ,12) ) ) +transpose(((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(shuffle(step(X,12) ) ,7) ) +transpose((X+transpose(transpose(X,-5) ,7) ) ,7) ) ,7) ) +step(((transpose(transpose(transpose(X,4) ,-5) ,4) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,12) ) ,-7) ,4) ) +transpose(transpose(arpeggio(transpose(transpose((X|X) ,-5) ,4) ) ,-5) ,7) ) ) +((echo((transpose(step(transpose(step(X,12) ,-7) ,12) ,-7) +(step(arpeggio((X|X) ) ,12) +(arpeggio((X+transpose(X,7) ) ) +echo(X,4,6) ) ) ) ,4,6) +transpose((transpose(transpose((((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +transpose(((X|X) +transpose(transpose(X,4) ,12) ) ,7) ) ,-5) ,4) +transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ,12) ) ,7) ) +transpose(echo(echo(transpose(shuffle(((echo(echo(X,4,6) ,4,6) |(transpose(echo(X,4,6) ,-5) +transpose((step(X,12) +transpose((((X+X) +transpose(step(X,12) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) ,12) ) ) |(echo((X+transpose(transpose(X,-7) ,12) ) ,4,6) +transpose(transpose((transpose(X,-5) +X) ,-7) ,7) ) ) ) ,-7) ,4,6) ,4,6) ,7) ) ) ) +(((arpeggio(step(transpose(shuffle((arpeggio(step(X,12) ) +echo(transpose((X+X) ,4) ,4,6) ) ) ,-5) ,12) ) +transpose(transpose(((transpose((echo(echo((shuffle(shuffle(transpose(X,-7) ) ) |transpose((((arpeggio((X+X) ) +X) +transpose(step(transpose(X,-7) ,12) ,4) ) +transpose((X+step(X,12) ) ,7) ) ,4) ) ,4,6) ,4,6) +transpose((transpose(echo(transpose(transpose(X,-5) ,4) ,4,6) ,-5) +transpose(((step(X,12) +transpose(transpose(transpose((X+X) ,4) ,4) ,4) ) +transpose(((X+transpose(transpose((X|X) ,4) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,7) ) ,4) ) ,-5) +transpose((step(transpose(((((transpose(shuffle(X) ,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose(X,-5) ) +(((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose(X,-5) ,-5) ) ) ,7) ) +transpose(((shuffle(transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ) +transpose((X+transpose(shuffle(X) ,7) ) ,4) ) +transpose((arpeggio(X) +(X+X) ) ,7) ) ,4) ) +transpose(transpose(((step(X,12) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(X,-7) ,12) ) ,-7) ,7) ) ,-5) ,12) +(((transpose(transpose((((X+X) |(X+transpose(X,7) ) ) |transpose(X,-5) ) ,-5) ,-5) |transpose(transpose(transpose(((step((echo(X,4,6) +transpose((X+X) ,12) ) ,12) +transpose((shuffle(shuffle(X) ) +(transpose(X,4) +transpose((X+transpose(transpose(X,-5) ,7) ) ,7) ) ) ,4) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ,4) ,-7) ,-7) ) +transpose(transpose(transpose(((((arpeggio(X) |step(X,12) ) +transpose((arpeggio(X) +transpose(X,4) ) ,7) ) |(arpeggio(shuffle(X) ) +step(arpeggio((transpose(X,4) +(X+transpose(X,12) ) ) ) ,12) ) ) +transpose((echo(transpose(shuffle(((X+X) +transpose(X,12) ) ) ,-5) ,4,6) +(step(echo(X,4,6) ,12) +(X|(X+transpose(X,12) ) ) ) ) ,12) ) ,4) ,4) ,4) ) +transpose(shuffle(((echo(((((X+transpose(X,12) ) +transpose((transpose(arpeggio(X) ,-5) +(X+X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(X,-7) ,4) ) ,4,6) +transpose(transpose(transpose(shuffle((transpose(X,4) +X) ) ,-7) ,-5) ,4) ) +transpose(((echo((arpeggio(X) |(transpose(X,-5) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) ) ,4,6) +transpose(((shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) +transpose((transpose(((X|X) +X) ,-7) +transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) ,-5) ,-5) ,7) ) ,4) ) +transpose(step(echo((X+(X+X) ) ,4,6) ,12) ,7) ) ,4) ) +transpose((shuffle((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) +(step(transpose(transpose(X,4) ,-5) ,12) |echo(transpose(transpose(X,-5) ,-5) ,4,6) ) ) ,7) ) ,7) ) ) ,7) ) ) ,4) ) +transpose((transpose(echo((((((((X+transpose(X,12) ) |X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(((transpose(transpose((X+X) ,-5) ,-5) +transpose(((X+X) +transpose(((X|X) +transpose(X,-7) ) ,12) ) ,4) ) +transpose(shuffle((X+arpeggio(X) ) ) ,7) ) ,12) ) |(shuffle(X) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ) +transpose(arpeggio((arpeggio((X+transpose(X,12) ) ) +((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +((X+X) +transpose(step(X,12) ,7) ) ) ) ) ,7) ) ,4,6) ,-7) +transpose(transpose(((transpose(step(X,12) ,4) +transpose((X+transpose(shuffle(X) ,12) ) ,7) ) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) ,4) ,-5) ) ,7) ) ,-7) ,4) ) +transpose((((step(transpose(shuffle((((transpose(transpose(X,-5) ,-5) +transpose(transpose(X,-7) ,4) ) +transpose((transpose(X,-5) +transpose(X,7) ) ,7) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ) ,-7) ,12) +transpose(transpose(((((transpose(step(X,12) ,-5) +transpose(((X+X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(echo(((transpose((X|X) ,-7) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,7) ) +transpose(transpose((shuffle(X) +transpose(echo(X,4,6) ,7) ) ,4) ,12) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,7) ) ,4) ,7) ) +shuffle((step(transpose(transpose((echo((X+transpose(X,7) ) ,4,6) +arpeggio((X+transpose(X,7) ) ) ) ,-5) ,4) ,12) +transpose((((X+shuffle((X+transpose(X,-5) ) ) ) |(((transpose((X+X) ,4) |((X|X) +X) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X|echo(X,4,6) ) ,7) ) ) +transpose((((arpeggio(X) |((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(((((X+transpose(X,7) ) +step(X,12) ) |(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +shuffle(X) ) ,4) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ,7) ) ,7) ) ,12) ) ) ) +transpose(transpose(transpose(((((((((X+X) |shuffle(X) ) +echo((X+X) ,4,6) ) +transpose(transpose(transpose(((X+X) |(X+transpose(X,12) ) ) ,-5) ,4) ,4) ) +transpose(transpose(((((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,-7) ,7) ) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,4) ) +transpose((transpose((((transpose((X+transpose(X,7) ) ,-5) +transpose((transpose(transpose(X,-7) ,4) |((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose(X,7) ) |(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose((((X+X) +transpose((X|X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ,7) ) ) ,4) |(((transpose(X,4) +transpose(arpeggio(X) ,12) ) +transpose((((X|(X+X) ) +echo(transpose(X,-7) ,4,6) ) +transpose(X,-7) ) ,4) ) +transpose((transpose(shuffle(transpose(X,-5) ) ,4) |((X+transpose(((transpose(X,4) |X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(arpeggio(transpose((X|X) ,-5) ) ,7) ) ) ,7) ) ) ,7) ) +transpose((transpose(arpeggio(((X+X) +echo(transpose(X,-7) ,4,6) ) ) ,4) |((((((X+transpose(X,7) ) +transpose((X+transpose(X,-5) ) ,12) ) |X) |((transpose(transpose(X,-7) ,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) +transpose(transpose(((X+transpose(X,12) ) |(X+X) ) ,4) ,4) ) +transpose(transpose((step(X,12) +(arpeggio(X) +transpose(X,7) ) ) ,-5) ,7) ) ) ,-7) ) ,4) ,-7) ,7) ) ,7) ) |transpose((arpeggio(transpose((((transpose((transpose(X,-5) +transpose(transpose(transpose(step((echo(transpose(X,-5) ,4,6) +transpose(((X+transpose(X,7) ) |(X+transpose(X,7) ) ) ,12) ) ,12) ,-5) ,4) ,7) ) ,4) |step(((((echo(X,4,6) +transpose((X+transpose((X+X) ,12) ) ,12) ) +transpose((X+transpose(transpose(X,4) ,7) ) ,-7) ) |(echo(X,4,6) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ) +transpose(shuffle((transpose(shuffle(X) ,4) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+X) +step(X,12) ) ,12) ) ) ,7) ) ) ,12) ) ,12) ) +transpose((echo((((((transpose(X,4) +transpose(step((X|X) ,12) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +(((X|X) +(X|step(X,12) ) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) +echo((step(((X+transpose(X,12) ) |transpose(X,-7) ) ,12) +(arpeggio((X+X) ) |((X+transpose(X,7) ) +arpeggio(X) ) ) ) ,4,6) ) +transpose(step(step(transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ,12) ,12) ,7) ) ,4,6) +((echo(transpose((X+X) ,-7) ,4,6) +transpose((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ) |(echo((X+transpose(X,7) ) ,4,6) +(((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) ) ,4) ) +transpose(((arpeggio((((((shuffle(X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(X,4) ) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,7) ) +shuffle(transpose(X,-7) ) ) ) +transpose(transpose(shuffle((transpose(step(X,12) ,4) +transpose((transpose((X+X) ,-7) +(transpose(X,-5) |X) ) ,12) ) ) ,-5) ,12) ) |transpose((transpose(X,-7) +transpose(((echo(echo(X,4,6) ,4,6) +transpose(X,7) ) +shuffle(X) ) ,12) ) ,-7) ) ,7) ) ,-5) ) +transpose(transpose(transpose((transpose((transpose((X|X) ,4) +transpose(X,-5) ) ,4) |((X|(X+X) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ) ,-7) ,-7) ,7) ) ,-5) ) ) +transpose((step(echo(((transpose(echo(transpose(((echo(shuffle(X) ,4,6) +transpose(arpeggio((((echo((X+transpose(X,12) ) ,4,6) +transpose(X,7) ) |arpeggio((arpeggio(X) +X) ) ) +transpose(echo(transpose(transpose(X,4) ,4) ,4,6) ,-7) ) ) ,4) ) +transpose((arpeggio(((transpose(X,-5) +transpose(X,7) ) +transpose(transpose((X+transpose((X|X) ,7) ) ,-7) ,7) ) ) |transpose(X,4) ) ,7) ) ,-7) ,4,6) ,4) +transpose(((shuffle((shuffle(step((X+X) ,12) ) +transpose(((X+transpose((X+X) ,7) ) +(transpose(X,-7) +(X+X) ) ) ,12) ) ) |arpeggio((transpose(step(transpose(arpeggio(arpeggio((X|X) ) ) ,-7) ,12) ,-5) +(transpose(echo(X,4,6) ,-7) +transpose((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) ) ) ) +transpose(transpose(shuffle(echo((transpose((echo((X+transpose(step(X,12) ,7) ) ,4,6) +transpose((X+transpose(X,7) ) ,4) ) ,-5) +transpose(echo(transpose(transpose(X,-5) ,-5) ,4,6) ,12) ) ,4,6) ) ,4) ,12) ) ,7) ) |((transpose(((transpose(transpose(X,4) ,4) |echo(transpose(X,4) ,4,6) ) +((arpeggio(step((arpeggio(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose(arpeggio(transpose(transpose(echo(X,4,6) ,-5) ,4) ) ,7) ) +transpose((transpose(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,-7) +step((transpose(transpose(X,-5) ,4) +X) ,12) ) ,7) ) ) ,4) +shuffle(arpeggio(echo((transpose(X,-5) +transpose(arpeggio((X|X) ) ,12) ) ,4,6) ) ) ) +transpose(((step(echo(((echo((X+transpose(X,7) ) ,4,6) +transpose(shuffle((((X|X) +echo(X,4,6) ) +(shuffle(X) +transpose(X,-7) ) ) ) ,4) ) +transpose(((X|X) +transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,4,6) ,12) +transpose(((shuffle(transpose(step(step((X|X) ,12) ,12) ,4) ) |(step(transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,-5) ,12) +((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) +step(transpose(X,-5) ,12) ) +transpose((transpose(arpeggio(X) ,-5) +(transpose(X,-5) |(X+X) ) ) ,12) ) ) ) +transpose(transpose(((transpose(((transpose((X+X) ,4) +transpose(X,4) ) +transpose(shuffle((X|X) ) ,7) ) ,-7) +transpose(transpose(step(X,12) ,-5) ,7) ) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) |transpose((X+X) ,4) ) ) ,-5) ,12) ) ,4) ) +transpose(((transpose(((shuffle(X) +transpose(echo(transpose((X|step(X,12) ) ,-5) ,4,6) ,4) ) +transpose((transpose(transpose(X,-5) ,-7) +transpose(echo(X,4,6) ,7) ) ,7) ) ,-7) +transpose((transpose(transpose(((transpose(X,-5) +transpose((X+transpose(X,-5) ) ,4) ) +transpose((shuffle(X) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4) ,-5) |(shuffle((X+transpose(X,12) ) ) +transpose(shuffle(step(X,12) ) ,7) ) ) ,12) ) +step(step(X,12) ,12) ) ,7) ) ,-7) ) ) ,4,6) ,12) |transpose(transpose(transpose(transpose(((((echo(transpose(X,-5) ,4,6) +transpose(echo(X,4,6) ,7) ) +echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) ) |arpeggio(transpose(((shuffle(X) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(X,7) ) ,-5) ) ) +transpose((echo(transpose(X,-5) ,4,6) +transpose(shuffle(X) ,-5) ) ,12) ) ,-7) ,-5) ,-7) ,-5) ) ,7) ) random seed used was 0 NOTE: Generated phrase was too large ( 14637 ) , it has been truncated at 5000 notes. EXPR = transpose(((transpose(transpose((echo(arpeggio((transpose((transpose(transpose(X,-5) ,4) +transpose((echo(transpose(X,-5) ,4,6) +((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4) ) ,-5) +transpose(transpose(transpose(echo(((X+transpose(X,7) ) +((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) ,4,6) ,-7) ,-5) ,12) ) ) ,4,6) +transpose(shuffle(transpose(shuffle(transpose(((transpose(((X+transpose(X,7) ) +transpose(step(X,12) ,7) ) ,-5) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose((X|X) ,-7) ,-5) ) ,4) ) +transpose(transpose(transpose((((((X|X) +X) +transpose((X+X) ,12) ) +transpose(((step(X,12) +transpose((X|X) ,12) ) +transpose(X,-7) ) ,4) ) +transpose(transpose((transpose(X,-5) |X) ,-7) ,7) ) ,-5) ,-5) ,7) ) ,-7) ) ,4) ) ,7) ) ,4) ,4) +transpose(((transpose(((((((transpose((((shuffle(shuffle(X) ) |echo(X,4,6) ) |shuffle((X+X) ) ) +transpose((transpose((transpose(transpose(X,4) ,4) +transpose(shuffle(X) ,7) ) ,4) +transpose((X+X) ,-5) ) ,7) ) ,4) +transpose((((transpose(echo(echo(X,4,6) ,4,6) ,-7) +transpose(((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(((X+transpose(X,7) ) +X) ,7) ) ,4) ) +transpose(transpose((arpeggio(arpeggio(transpose(X,4) ) ) +(((X|X) +transpose(X,12) ) |transpose((arpeggio(X) +transpose(arpeggio(X) ,7) ) ,-5) ) ) ,4) ,7) ) +transpose(step((((transpose(echo(X,4,6) ,-5) |arpeggio(shuffle(echo((X+X) ,4,6) ) ) ) +transpose(((X|(transpose((X+X) ,-7) +(X+echo(X,4,6) ) ) ) |(shuffle((X+transpose(X,12) ) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) ,-7) ,12) ) ) ,4) ) +transpose(transpose(transpose((transpose(X,-5) |((shuffle(X) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) ) ,4) ,4) ,7) ) ,12) ,4) ) +transpose((((((X+transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) +arpeggio(X) ) |transpose((transpose((X+X) ,4) |echo(transpose(transpose(X,-5) ,-5) ,4,6) ) ,4) ) ,7) ) +transpose((transpose(transpose(transpose(((X|X) +(X+X) ) ,-7) ,-7) ,-5) +transpose(arpeggio(arpeggio((transpose(step(X,12) ,4) +transpose(transpose((X+transpose(X,7) ) ,4) ,-5) ) ) ) ,7) ) ,4) ) +transpose(transpose((((step(arpeggio(X) ,12) +transpose(((transpose(X,-7) |X) +transpose(transpose(X,-7) ,7) ) ,12) ) +transpose((((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) +echo(X,4,6) ) ,7) ) +(((transpose(arpeggio(shuffle(transpose(X,4) ) ) ,-7) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) +transpose(echo(transpose((X|X) ,-5) ,4,6) ,4) ) +transpose((echo(transpose(arpeggio(X) ,4) ,4,6) |(echo((X+(X+transpose(X,12) ) ) ,4,6) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ) ,7) ) ) ,4) ,7) ) ,-7) +transpose(arpeggio(transpose(transpose((transpose(arpeggio(arpeggio(echo(X,4,6) ) ) ,4) +transpose(step(((X|X) +transpose(X,-7) ) ,12) ,12) ) ,-5) ,4) ) ,4) ) +transpose(transpose((transpose(((echo(transpose((((X+transpose((step(X,12) |transpose(X,-5) ) ,4) ) +transpose(((X|X) +transpose(step(X,12) ,7) ) ,7) ) |(echo(step(X,12) ,4,6) +transpose((transpose(X,-7) |(X+transpose(X,12) ) ) ,12) ) ) ,-5) ,4,6) |step(transpose(arpeggio(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ) ,-7) ,12) ) +transpose(echo(transpose(transpose(((X+transpose(((X|X) +X) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) ,-5) ,4,6) ,-7) ) ,-5) +transpose(echo(transpose(transpose(((transpose((transpose((X+(X|X) ) ,4) |shuffle(transpose(echo(X,4,6) ,-5) ) ) ,4) +transpose((arpeggio(((X+step(X,12) ) +transpose((X+X) ,7) ) ) |(echo(arpeggio(X) ,4,6) |transpose(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose((arpeggio(X) +X) ,-5) ,12) ) ,4) ) ) ,4) ) +transpose((shuffle(transpose(transpose((transpose(X,-7) +X) ,4) ,-7) ) |step((echo(transpose(X,4) ,4,6) +X) ,12) ) ,7) ) ,-7) ,4) ,4,6) ,7) ) ,-5) ,7) ) ,4) ) +transpose(((echo(transpose(transpose(transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,4) ,4) ,-5) ,4,6) +arpeggio((echo(shuffle(((X+transpose(X,12) ) |transpose(X,4) ) ) ,4,6) +echo(((((((X+X) +transpose((X+transpose(X,12) ) ,12) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) +transpose(transpose(transpose(transpose(X,-5) ,4) ,4) ,4) ) +transpose(transpose((arpeggio(transpose(X,4) ) +transpose(step((transpose(X,-7) +X) ,12) ,12) ) ,-7) ,7) ) |((echo(X,4,6) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((echo((X+(X+transpose(X,12) ) ) ,4,6) +transpose((step(arpeggio(X) ,12) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,4) ) +transpose((X+transpose((X|X) ,12) ) ,7) ) ,7) ) ) ,4,6) ) ) ) |transpose(transpose(step(transpose((step(step(transpose(((transpose(arpeggio(transpose(X,-7) ) ,4) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ,-5) ,7) ) ,4) ,12) ,12) |shuffle((arpeggio(transpose((transpose((X+X) ,-5) +(transpose(X,-5) +(X+X) ) ) ,4) ) |(((X+transpose(transpose(X,-7) ,12) ) +transpose(echo(step(transpose(X,-7) ,12) ,4,6) ,12) ) |(X|(X+transpose(X,7) ) ) ) ) ) ) ,4) ,12) ,-5) ,-7) ) ,7) ) ,-7) random seed used was 0

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