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((((((transpose((echo((((step(transpose(transpose((shuffle(X) +transpose(((X|X) +transpose(transpose(X,-7) ,7) ) ,7) ) ,-7) ,-5) ,12) |transpose((step(((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) +transpose((((X|step(shuffle(transpose(X,4) ) ,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(step(transpose(echo((arpeggio((X+transpose(X,12) ) ) +transpose((transpose(transpose(X,-5) ,-7) +transpose(step(X,12) ,12) ) ,12) ) ,4,6) ,-5) ,12) ,-5) ,4) ) +transpose(((((((transpose((X|X) ,-7) +transpose((X+X) ,7) ) +transpose(step(((X|X) +X) ,12) ,4) ) +transpose(transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ,-7) ,7) ) +transpose((transpose(((X|X) +transpose((X+transpose(X,7) ) ,12) ) ,-7) +transpose(echo(X,4,6) ,12) ) ,7) ) |((((transpose(arpeggio(X) ,-5) +X) +transpose(arpeggio((arpeggio(X) +X) ) ,7) ) +arpeggio(X) ) |(transpose(transpose(X,-7) ,4) |transpose(transpose(transpose(X,-5) ,4) ,-5) ) ) ) +transpose(transpose((step((X|X) ,12) |transpose(X,-5) ) ,-7) ,7) ) ,7) ) ,4,6) |((transpose((transpose(step(X,12) ,4) |echo(transpose(X,-5) ,4,6) ) ,4) +(transpose(((shuffle((((echo(X,4,6) |transpose(shuffle(X) ,4) ) +(transpose(X,-5) +(X|X) ) ) +transpose(step((transpose(shuffle(X) ,-7) |(((transpose(X,4) +transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ) ,12) ,7) ) ) +transpose(((transpose(transpose((arpeggio(transpose(X,4) ) +X) ,-7) ,4) +transpose(((transpose(((transpose(X,4) +(X+transpose(X,12) ) ) +transpose(transpose(X,4) ,7) ) ,-5) |shuffle(transpose(transpose(X,-7) ,-5) ) ) +transpose((((X|X) +(X+X) ) +(X+transpose(((X+X) |transpose(X,-5) ) ,4) ) ) ,12) ) ,4) ) +transpose((transpose(((X+transpose(X,7) ) |X) ,-5) +transpose(((transpose(X,-7) |X) +transpose(transpose((echo(X,4,6) |step((X+X) ,12) ) ,-7) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(transpose(transpose((X|X) ,-5) ,4) ,-7) ,7) ) ,-5) +echo(shuffle((step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(((shuffle(X) |(X+transpose(X,12) ) ) +transpose(X,4) ) ,7) ) ) ,4,6) ) ) +transpose((transpose((echo((step(X,12) +X) ,4,6) +transpose(((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(step(transpose(X,4) ,12) ,12) ) +transpose((X+transpose(transpose(X,-7) ,12) ) ,12) ) ,12) ) ,-5) +transpose(transpose(echo(transpose(((((X|X) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +(transpose(X,-5) +(((X+X) +transpose(step((X+X) ,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ) ,4) ,4,6) ,-5) ,7) ) ,12) ) ) ,4) +transpose(transpose((transpose(transpose(transpose((transpose(step(transpose(X,4) ,12) ,-7) |step(X,12) ) ,4) ,-5) ,-7) +arpeggio(transpose((((transpose((echo(transpose((X+transpose(transpose(X,-5) ,12) ) ,4) ,4,6) +((X+transpose(transpose(transpose(X,-7) ,4) ,12) ) +transpose((((step(X,12) |transpose(X,4) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,7) ) ) ,4) +transpose(((X|X) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose((shuffle(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((transpose(X,4) |((X+X) +transpose(arpeggio(X) ,7) ) ) ,12) ) ,4) ,4) ) +transpose(((arpeggio((echo(X,4,6) |X) ) |(transpose(X,-5) +((((X+transpose(X,4) ) +transpose(X,7) ) |(X|X) ) +transpose((X+transpose(X,7) ) ,7) ) ) ) +transpose(transpose(transpose(((X|X) +arpeggio(transpose(X,-5) ) ) ,-5) ,4) ,7) ) ,7) ) ,-5) ) ) ,-5) ,-5) ) +transpose(arpeggio(echo(transpose(shuffle(transpose(((((((step(X,12) +transpose(echo((X|X) ,4,6) ,12) ) +arpeggio(transpose(X,-5) ) ) +transpose(transpose(((transpose(arpeggio(X) ,-7) |arpeggio(X) ) +transpose(shuffle(X) ,-5) ) ,4) ,7) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-5) ) +transpose(((arpeggio((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) ) |shuffle(X) ) |(((X|(X+transpose(transpose(X,4) ,12) ) ) +(((X+X) +transpose(X,7) ) +transpose(((X+transpose(X,12) ) +X) ,7) ) ) +(echo((X+transpose(X,7) ) ,4,6) |shuffle(transpose(X,-7) ) ) ) ) ,4) ) +transpose((transpose(shuffle((((echo(X,4,6) +transpose(arpeggio(X) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ) ,-7) +transpose(transpose(transpose(transpose((transpose(echo(X,4,6) ,-7) |shuffle(X) ) ,-5) ,-7) ,4) ,12) ) ,7) ) ,-5) ) ,4) ,4,6) ) ,4) ) +transpose(((((transpose(((transpose(transpose((X+transpose(shuffle(X) ,7) ) ,4) ,4) +transpose((transpose(X,4) +transpose(echo(transpose(transpose(X,-7) ,4) ,4,6) ,12) ) ,12) ) |(echo((X+transpose(X,7) ) ,4,6) |transpose(step(transpose(X,-7) ,12) ,-7) ) ) ,-5) +transpose((arpeggio(echo((transpose((X+(X+X) ) ,-7) +transpose((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(transpose(step((transpose(X,-7) +(X+transpose(X,7) ) ) ,12) ,-7) ,12) ) ,12) ) ,4,6) ) |(echo((transpose(((transpose(X,-7) |(X|X) ) +transpose(echo(X,4,6) ,12) ) ,4) +transpose(step((X|X) ,12) ,7) ) ,4,6) +echo(arpeggio((((X+X) +shuffle(X) ) +transpose(X,12) ) ) ,4,6) ) ) ,7) ) +transpose(transpose(arpeggio(transpose((arpeggio(X) |(X|X) ) ,-5) ) ,-5) ,7) ) +transpose(echo(shuffle(((((transpose(transpose(X,-7) ,-5) +transpose(arpeggio(shuffle(X) ) ,4) ) +transpose(((X+transpose((X+transpose(X,12) ) ,7) ) +echo((X+transpose(X,7) ) ,4,6) ) ,7) ) |(transpose(X,4) |transpose((X+X) ,-5) ) ) +transpose((transpose(transpose(X,-5) ,4) +transpose(((((transpose(transpose(X,-7) ,-5) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) +transpose(((transpose(X,-5) +(X+transpose(X,12) ) ) +(X+transpose(X,12) ) ) ,12) ) +transpose((((shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(step(transpose(X,-5) ,12) ,-5) ,4) ) +transpose(transpose(transpose(arpeggio(X) ,-7) ,4) ,7) ) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ,7) ) ,12) ) ) ,4,6) ,7) ) |shuffle(transpose((echo(step((step(X,12) +(transpose(X,-5) |transpose(X,-5) ) ) ,12) ,4,6) +(transpose((((step(transpose(transpose(X,-5) ,-5) ,12) +transpose(step(transpose(X,-5) ,12) ,4) ) +transpose(transpose(transpose((transpose(X,4) +transpose(((X+X) +transpose(arpeggio(X) ,12) ) ,7) ) ,-5) ,-5) ,7) ) +transpose(transpose((arpeggio(X) +transpose((X+X) ,7) ) ,-7) ,12) ) ,4) +transpose(step(transpose((((((shuffle((X+transpose(X,12) ) ) +transpose((transpose(X,4) +transpose(X,12) ) ,12) ) +transpose(step((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(X,7) ) ,12) ,4) ) +transpose(step((transpose(step((X+transpose(X,7) ) ,12) ,-5) |step(((X+transpose(X,7) ) +X) ,12) ) ,12) ,7) ) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(arpeggio(((step(transpose(shuffle(X) ,-5) ,12) +transpose((transpose(X,4) +transpose((transpose(X,4) |X) ,12) ) ,4) ) +transpose((shuffle(X) +transpose(X,12) ) ,7) ) ) ,7) ) ,-5) ,12) ,12) ) ) ,4) ) ) ,7) ) |((shuffle((transpose(step(((transpose(transpose(((((X+transpose(X,7) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(X) ) ) +echo(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,4,6) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ) ,-5) ,-7) +transpose(((transpose(step(X,12) ,4) +echo(((X|X) +transpose(transpose(X,4) ,12) ) ,4,6) ) +((arpeggio(arpeggio(X) ) +(((X+X) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) +transpose(step((transpose(X,-5) +transpose(transpose(X,4) ,12) ) ,12) ,7) ) ) ,12) ) +transpose((transpose(shuffle(transpose(((((((X|X) +transpose(X,-7) ) +transpose((((X|X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) |(arpeggio(X) +step(X,12) ) ) +arpeggio((X|transpose(X,4) ) ) ) ,-7) ) ,4) +(echo(step((((X+transpose(X,12) ) +X) |transpose(X,-5) ) ,12) ,4,6) +transpose(transpose(((X+X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,12) ) ) ,12) ) ,12) ,4) |transpose(arpeggio(transpose(transpose(transpose(transpose((echo(transpose(X,4) ,4,6) +transpose((transpose((transpose(X,4) +transpose(transpose(X,4) ,7) ) ,-5) |(X+X) ) ,12) ) ,-7) ,4) ,-5) ,-5) ) ,-7) ) ) +transpose((transpose(((transpose(step(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ) ,12) ,-5) +transpose(transpose(((transpose(transpose(arpeggio(X) ,4) ,-5) |((transpose(step(X,12) ,4) +transpose((step(X,12) +transpose((((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,-7) ) |(echo(transpose(transpose(X,4) ,-5) ,4,6) +transpose((arpeggio((X|step(X,12) ) ) +((X|transpose((X+transpose(X,7) ) ,4) ) +arpeggio(transpose(X,4) ) ) ) ,7) ) ) ) +transpose(transpose((echo(X,4,6) +transpose(((transpose(X,-5) +transpose(arpeggio(echo(echo(X,4,6) ,4,6) ) ,4) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,12) ) ,-5) ,12) ) ,-5) ,4) ) +transpose(step((((transpose(arpeggio((((X|X) +transpose((X+X) ,7) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ) ,-5) +transpose(transpose((X|(transpose(X,-7) |(X|X) ) ) ,-7) ,12) ) +(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) |transpose(step(transpose(X,-5) ,12) ,-5) ) ) +transpose(transpose(step(shuffle(shuffle(shuffle(arpeggio(transpose(X,4) ) ) ) ) ,12) ,-5) ,7) ) ,12) ,7) ) ,-7) +transpose(transpose(((transpose((transpose((shuffle(transpose(X,-5) ) +transpose(echo(X,4,6) ,12) ) ,-7) +transpose(echo(transpose((((transpose(transpose(X,-5) ,-5) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) +transpose((transpose(X,4) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ,4) ) +transpose(arpeggio(transpose(shuffle(X) ,4) ) ,7) ) ,-5) ,4,6) ,7) ) ,4) +transpose((((arpeggio(((((X+transpose(X,7) ) +(((X+transpose(transpose(X,-7) ,12) ) +transpose((shuffle(X) |transpose(X,-7) ) ,4) ) +transpose(((X|X) |X) ,7) ) ) +transpose(transpose(transpose((X+X) ,4) ,-7) ,4) ) +transpose((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ,7) ) ) |(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ,12) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,-7) ,7) ) ) +(transpose(transpose(X,4) ,4) +transpose(echo(transpose(step(transpose((X|X) ,-7) ,12) ,-5) ,4,6) ,7) ) ) +transpose(transpose((step((X|X) ,12) +transpose(transpose(step(transpose(step(transpose(X,4) ,12) ,-5) ,12) ,4) ,7) ) ,-5) ,7) ) ,4) ) +transpose(step((echo(step((shuffle(((shuffle(X) +X) +(shuffle(X) |transpose(X,4) ) ) ) |(arpeggio(X) +transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ,7) ) ) ,12) ,4,6) |transpose(((shuffle((shuffle(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) +(transpose(arpeggio(echo(X,4,6) ) ,4) +transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ) ) +transpose(shuffle(transpose(((transpose(X,-7) +transpose(X,-7) ) |X) ,-7) ) ,12) ) ,-5) ) ,12) ,7) ) ,-5) ,7) ) ,4) ) +transpose(((step((step(shuffle(((arpeggio(((X+transpose(X,7) ) |((X+X) +X) ) ) +step((step(((X+transpose(X,12) ) +transpose(X,12) ) ,12) +transpose(echo(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,12) ) +arpeggio((transpose(X,4) +X) ) ) ) ,12) +transpose((((((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +(((X+transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) +transpose((X+X) ,-7) ) |transpose(((X|X) +transpose((X|X) ,12) ) ,4) ) ) +transpose(shuffle((transpose(X,4) +transpose((X+X) ,12) ) ) ,4) ) +transpose(transpose(transpose((transpose(step(X,12) ,-7) +transpose(transpose(step(step((X+X) ,12) ,12) ,-7) ,12) ) ,4) ,-5) ,7) ) ,-7) ) ,12) +shuffle((shuffle(transpose((transpose(X,-5) +echo(X,4,6) ) ,-5) ) +(transpose(transpose(X,4) ,-7) +transpose(((X+X) |shuffle(echo(X,4,6) ) ) ,7) ) ) ) ) +((transpose(transpose((transpose(echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) ,-5) +step((X+transpose(X,7) ) ,12) ) ,4) ,4) +(transpose((echo(transpose(transpose((X|X) ,4) ,-7) ,4,6) +(step(X,12) +transpose(transpose(step(X,12) ,-5) ,-5) ) ) ,-7) +transpose((transpose(arpeggio(((((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(X,12) ) +(echo(X,4,6) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,12) ) ) ) ,4) +transpose(transpose(transpose(transpose(((X+transpose((X+X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ,4) ,4) ,-5) ) ,7) ) ) |echo(((step(echo((step(((echo((X+X) ,4,6) +transpose((X+transpose(transpose(X,4) ,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(((X+X) +transpose(((transpose(X,-7) +transpose((X+X) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,7) ) ,12) |((shuffle(X) +transpose(echo(X,4,6) ,7) ) +(transpose(X,4) +transpose(X,-5) ) ) ) ,4,6) ,12) +transpose(((transpose(((transpose(shuffle((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +X) ) ,-7) +transpose(echo((((X+X) +transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ,4,6) ,4) ) +transpose(((((X+X) +echo((X|X) ,4,6) ) |arpeggio(X) ) +step((shuffle(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,7) ) ,-7) |(transpose(transpose(transpose(X,-5) ,4) ,-7) |step((((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) +transpose((X+transpose(transpose(X,-7) ,7) ) ,7) ) +transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) |transpose(shuffle(X) ,-7) ) ,12) ) ,12) ) ) +transpose((((transpose(arpeggio(transpose(echo(X,4,6) ,4) ) ,4) +transpose(transpose(((transpose((((X+X) +transpose(X,4) ) +transpose((X+X) ,7) ) ,-7) +(X+transpose(transpose(X,4) ,12) ) ) +(X|X) ) ,-5) ,4) ) +transpose(transpose((transpose(((X|X) +(X+X) ) ,-7) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ,-7) ,7) ) +(arpeggio((arpeggio(echo(shuffle(X) ,4,6) ) +transpose(((transpose(X,4) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ) +(transpose(step((X|transpose(X,4) ) ,12) ,-7) +transpose(transpose((step(X,12) +transpose(step(transpose(X,-5) ,12) ,7) ) ,-7) ,12) ) ) ) ,7) ) ,4) ) +transpose(((transpose((transpose(((((transpose(X,-5) |X) +transpose(((X|X) |echo(X,4,6) ) ,12) ) +X) +transpose((transpose((X+transpose(X,7) ) ,-7) |transpose(((X|X) +transpose(transpose(X,-7) ,7) ) ,-5) ) ,12) ) ,-5) |((((transpose(shuffle(X) ,4) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) +transpose(transpose((echo(X,4,6) +X) ,4) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose((X+transpose(step(X,12) ,12) ) ,-7) ,-5) ) ) ,-7) +transpose((((echo(X,4,6) |X) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) +transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) +transpose((((X+transpose(X,12) ) |X) +transpose(((X|X) +X) ,12) ) ,12) ) ,4) ) +transpose(transpose((((((((X|X) +transpose(X,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) +transpose(((shuffle(X) +transpose((transpose(X,4) |X) ,4) ) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) ,12) ) +transpose(transpose(transpose((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4) ,-5) ,12) ) +transpose(((arpeggio(X) +transpose((X+transpose(step(X,12) ,7) ) ,4) ) +transpose(((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(X,7) ) ,-5) ,7) ) ,7) ) ,4,6) ) ) ,7) ) ) +transpose(arpeggio(transpose(((((step(step((transpose((shuffle(X) +(((X|X) +transpose(X,4) ) +transpose(X,7) ) ) ,4) +(((((X+X) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((X|X) ,7) ) |(transpose(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,4) +(X|X) ) ) ) ,12) ,12) +shuffle(transpose((echo(X,4,6) +transpose(transpose(X,4) ,12) ) ,-7) ) ) +(transpose(arpeggio((X+transpose(X,12) ) ) ,-5) +transpose(((transpose(((((transpose(X,-7) +transpose(X,4) ) +transpose((X|X) ,7) ) +echo((X|X) ,4,6) ) +transpose(shuffle(transpose((X|X) ,4) ) ,12) ) ,4) +transpose(transpose(step((((echo(X,4,6) |X) +transpose((transpose(transpose(X,-5) ,4) +((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) ,12) ) |((X+transpose(arpeggio(X) ,12) ) |(transpose(transpose(X,-5) ,-7) |transpose(shuffle(X) ,4) ) ) ) ,12) ,-5) ,4) ) +transpose(shuffle(transpose((transpose(X,4) |echo(X,4,6) ) ,-7) ) ,7) ) ,7) ) ) |(shuffle(((step((X+X) ,12) +transpose((arpeggio(X) +transpose(X,12) ) ,12) ) |((((X+transpose(X,7) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ) ) +transpose((step(X,12) +(arpeggio((X+X) ) |X) ) ,4) ) ) |(((transpose(transpose((transpose(transpose(shuffle((((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ) ,-5) ,-7) +(step(transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ,12) +transpose((step(echo(transpose(X,-7) ,4,6) ,12) +transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |(X|X) ) ,-5) ,12) ) ,12) ) ) ,4) ,4) +transpose((shuffle(((arpeggio(transpose(step(shuffle(X) ,12) ,-7) ) +transpose(arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,12) ) +transpose(transpose(X,-7) ,4) ) ) |transpose((transpose((transpose((echo(transpose(X,-7) ,4,6) +transpose(X,-5) ) ,-5) +step(arpeggio((X+transpose(X,12) ) ) ,12) ) ,-7) +(((transpose((shuffle(X) +(shuffle(X) +transpose(X,12) ) ) ,-7) +transpose((transpose(arpeggio(X) ,-7) +(transpose(X,4) |transpose(X,-5) ) ) ,12) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(((transpose(X,4) +(X+transpose(X,7) ) ) +transpose((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) |((X+transpose((X+X) ,4) ) +transpose(X,7) ) ) ,12) ) ,-5) ,7) ) ) ,4) ) ,4) ) +transpose(((((arpeggio(transpose(transpose(arpeggio((transpose(X,-5) |X) ) ,4) ,-7) ) +transpose(transpose(transpose((echo((X|step(X,12) ) ,4,6) |((X+transpose((X+X) ,12) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ) ) ,4) ,-5) ,7) ) +transpose((((((transpose((X+transpose(X,7) ) ,-5) |arpeggio(X) ) +transpose(step(echo((X+transpose(X,12) ) ,4,6) ,12) ,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) +transpose((shuffle(X) |step(X,12) ) ,12) ) +(transpose((step(transpose(transpose(X,-5) ,4) ,12) +(transpose((X+transpose(echo(X,4,6) ,7) ) ,-7) |step(transpose(X,-5) ,12) ) ) ,-7) +((echo((X+transpose(X,12) ) ,4,6) +transpose(transpose(X,-7) ,7) ) +((shuffle(X) +transpose((X+X) ,12) ) +(X+X) ) ) ) ) ,12) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) |transpose(transpose((transpose((echo(X,4,6) +transpose((((transpose(X,-7) +transpose(arpeggio(X) ,12) ) +transpose((transpose(X,-5) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,7) ) ,-5) |(echo((X+transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,4,6) +transpose(transpose(((arpeggio(X) +transpose(X,12) ) +((transpose((X+transpose(X,7) ) ,-7) +transpose(transpose(X,-7) ,7) ) |(X+transpose((X+transpose(X,7) ) ,12) ) ) ) ,4) ,7) ) ) ,4) ,-5) ) ,7) ) +arpeggio(transpose(step((transpose(((transpose(X,-7) +X) +arpeggio(X) ) ,-5) |transpose((transpose((X|transpose(X,-5) ) ,-5) +transpose(arpeggio(transpose(arpeggio(X) ,-7) ) ,12) ) ,-5) ) ,12) ,-5) ) ) ) ,4) ) ,12) ) ,-5) random seed used was 67488044 NOTE: Generated phrase was too large ( 13400 ) , it has been truncated at 5000 notes. EXPR = step(echo(step(step(arpeggio(echo(transpose(arpeggio((transpose((X+transpose(arpeggio(X) ,12) ) ,4) |arpeggio(transpose(X,-7) ) ) ) ,-5) ,4,6) ) ,12) ,12) ,4,6) ,12) random seed used was 0

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