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: step(((transpose(((transpose(transpose(arpeggio(echo(shuffle(transpose(step(((transpose(X,4) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(X,7) ) ,12) ,-5) ) ,4,6) ) ,4) ,4) |(((shuffle(transpose(transpose(transpose(((arpeggio(X) |transpose((X|X) ,-5) ) |transpose(transpose(X,-5) ,4) ) ,-5) ,4) ,4) ) +transpose(arpeggio(transpose(transpose((((X+transpose(((X|X) +transpose(transpose(step(X,12) ,4) ,12) ) ,12) ) +transpose((echo(echo(shuffle((X+transpose(X,12) ) ) ,4,6) ,4,6) +transpose(transpose(arpeggio(shuffle(X) ) ,-5) ,12) ) ,12) ) +((step(((X|transpose(X,-7) ) |(X|arpeggio(X) ) ) ,12) |((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ) +((transpose(X,-7) |(shuffle(X) |(X+X) ) ) +transpose(transpose(transpose(echo(X,4,6) ,-5) ,-7) ,7) ) ) ) ,4) ,-5) ) ,12) ) +transpose(arpeggio(step(((transpose((((transpose(step(((X+transpose(shuffle(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ,-7) +transpose(((transpose(transpose(X,-7) ,-7) |(X+X) ) +transpose((arpeggio(transpose(arpeggio(X) ,4) ) +transpose((X|(X+X) ) ,12) ) ,7) ) ,4) ) +transpose((transpose(echo(transpose(X,-7) ,4,6) ,-5) +transpose((X|X) ,12) ) ,7) ) |(arpeggio(X) +transpose(arpeggio((transpose((X|X) ,4) |(((X+X) +transpose(((X+X) +(X+transpose(X,12) ) ) ,4) ) +transpose(X,7) ) ) ) ,12) ) ) ,-7) +((((transpose(echo(X,4,6) ,4) +transpose((step(X,12) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) +((step(transpose(arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,-5) ,12) +transpose(transpose(transpose(echo(transpose(X,-7) ,4,6) ,-7) ,-5) ,4) ) +transpose(transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ,-5) ,7) ) ) ) +transpose(transpose(((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,-7) ,-5) ) ,12) ) ,4) ) +transpose(transpose(((shuffle(((X+transpose(X,7) ) |(transpose(transpose((X|X) ,-7) ,-5) +transpose(((transpose(X,4) |X) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ,12) ) ) ) +transpose(((X+transpose(X,7) ) +shuffle((arpeggio(X) +transpose(transpose(X,-7) ,12) ) ) ) ,7) ) |((((transpose((X+transpose(X,12) ) ,4) |(X+transpose(((X|X) +X) ,12) ) ) |transpose(X,-7) ) +transpose((step((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose((transpose(transpose(transpose(X,4) ,-5) ,-7) |step((X+arpeggio(X) ) ,12) ) ,7) ) ) ,-5) ,7) ) ) +transpose(transpose((shuffle(step(transpose(transpose(transpose(X,-7) ,4) ,-5) ,12) ) +transpose(transpose(transpose(((transpose(X,4) +transpose(X,12) ) +transpose((((X|X) +transpose((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) ,7) ) ,4) ,-7) ,7) ) ,-7) ,12) ) ,-5) +transpose(shuffle((transpose(transpose((shuffle(shuffle(((transpose((transpose(X,-7) |(step(X,12) +transpose(echo((transpose(X,-7) +X) ,4,6) ,12) ) ) ,-5) +((transpose(((transpose(shuffle(step(X,12) ) ,4) +transpose(shuffle(step(X,12) ) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,4) +transpose((transpose((transpose(X,-5) +transpose(transpose(X,4) ,12) ) ,-7) +(X|(X|X) ) ) ,4) ) +transpose(transpose(((step((X+transpose(X,12) ) ,12) +arpeggio(transpose(X,-5) ) ) +transpose(X,-5) ) ,-7) ,7) ) ) +(echo(transpose(transpose((((echo(transpose(X,-5) ,4,6) +transpose((X+X) ,12) ) +transpose(arpeggio(X) ,4) ) +transpose((transpose((X+X) ,-5) |step((X|X) ,12) ) ,7) ) ,-5) ,4) ,4,6) +(transpose(transpose(transpose(((X|X) +transpose(X,12) ) ,-7) ,-7) ,4) +transpose((((transpose(shuffle(transpose(X,4) ) ,-7) +transpose((X+X) ,4) ) +transpose(transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,7) ) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,4) ,7) ) ,12) ) ) ) ) ) +((transpose(arpeggio(transpose((transpose((arpeggio(X) +transpose(X,-5) ) ,4) +((transpose((X+X) ,-5) |echo(X,4,6) ) +X) ) ,-5) ) ,-7) +transpose(((((((((echo((X+transpose(X,12) ) ,4,6) +transpose(echo((X|X) ,4,6) ,4) ) +transpose(((X|X) |X) ,7) ) +transpose(shuffle(step(X,12) ) ,4) ) +transpose(((step((X+transpose(X,7) ) ,12) +transpose((X|X) ,4) ) +transpose((X|X) ,7) ) ,7) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(transpose((((shuffle(arpeggio(X) ) +transpose(transpose((X|X) ,-5) ,12) ) +transpose((X|((X+transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,-7) ,7) ) +arpeggio(transpose((((transpose((X+X) ,4) |((X+transpose(X,7) ) +X) ) +transpose(((shuffle(X) +transpose(transpose(X,-7) ,12) ) |transpose(transpose(X,-7) ,-7) ) ,4) ) +transpose(transpose(echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) ,4) ,7) ) ,-7) ) ) +transpose((transpose(transpose(((transpose(transpose(transpose(X,4) ,-7) ,-5) +transpose(transpose((step(X,12) +X) ,-5) ,7) ) +transpose(echo((transpose(arpeggio(X) ,-7) +((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) ,4,6) ,12) ) ,-7) ,-5) +transpose(transpose(transpose(((shuffle(X) |arpeggio(shuffle(X) ) ) |arpeggio(X) ) ,4) ,-7) ,7) ) ,12) ) ,4) ) +transpose(transpose(transpose((((transpose((X+transpose(X,7) ) ,4) +transpose(((transpose(X,-5) +transpose((X+transpose(transpose(X,4) ,12) ) ,4) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,4) ) +transpose(((X+X) |echo(X,4,6) ) ,7) ) +transpose(transpose(X,-7) ,-5) ) ,-5) ,-7) ,7) ) ) ,-5) ,4) +(((transpose(step(((transpose(transpose(X,4) ,4) +shuffle(X) ) +transpose((X+X) ,12) ) ,12) ,-5) |((step((step(step(((X+transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ,12) |((arpeggio(transpose(transpose(transpose(X,-5) ,-7) ,-7) ) +transpose(transpose(shuffle(arpeggio(X) ) ,4) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ) ,12) |(arpeggio((X|X) ) +transpose(transpose((X+transpose((X+X) ,7) ) ,-7) ,12) ) ) +arpeggio(transpose(step(arpeggio(X) ,12) ,-5) ) ) ) |echo(transpose((transpose((transpose((arpeggio(shuffle(X) ) +arpeggio(transpose(X,-5) ) ) ,-5) +transpose(transpose(shuffle(transpose((X|X) ,-7) ) ,-5) ,12) ) ,-7) +(((X+transpose(X,7) ) +transpose(step(X,12) ,12) ) +(transpose(echo(X,4,6) ,-5) +transpose(step(X,12) ,12) ) ) ) ,-5) ,4,6) ) +transpose(step(transpose((transpose(echo((transpose((transpose(X,4) +arpeggio(X) ) ,-5) |step(transpose(step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,4) ,12) ) ,4,6) ,-7) +transpose((transpose(((shuffle(arpeggio(arpeggio(X) ) ) +transpose((transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) +transpose((X+transpose(echo(transpose((X+X) ,-7) ,4,6) ,7) ) ,7) ) ,4) ) +transpose((arpeggio(X) +transpose((X+X) ,7) ) ,7) ) ,-5) +transpose((step((X+transpose(X,12) ) ,12) +(X|X) ) ,4) ) ,7) ) ,-5) ,12) ,-7) ) ) ) ,4) ) +transpose((((((shuffle(arpeggio(shuffle(transpose(echo(transpose(transpose(transpose(transpose(transpose(step(X,12) ,-5) ,-5) ,-5) ,-5) ,4) ,4,6) ,-5) ) ) ) +transpose((transpose((echo((((step(X,12) +transpose((arpeggio(X) +X) ,4) ) +transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) +transpose(((((X+X) +transpose(transpose(X,-7) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) ) ,4,6) +transpose(((step((echo((echo(transpose(X,4) ,4,6) +transpose(transpose(((X|(X+transpose(X,7) ) ) +transpose((arpeggio(X) +transpose(X,12) ) ,12) ) ,-7) ,7) ) ,4,6) +transpose((((shuffle(transpose(X,-7) ) |transpose(transpose(X,-5) ,4) ) +((X+transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ) |(((transpose(X,-7) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(X,7) ) +transpose(step(transpose(transpose(X,4) ,-5) ,12) ,7) ) ) ,12) ) ,12) +transpose((((shuffle(X) |(echo(X,4,6) |step(echo((X|step(X,12) ) ,4,6) ,12) ) ) +((step(transpose(echo(X,4,6) ,-7) ,12) +transpose(X,12) ) +transpose(transpose(((X|X) +transpose(transpose(transpose(X,-5) ,4) ,12) ) ,-5) ,12) ) ) +transpose(transpose(((((echo((X+transpose(X,7) ) ,4,6) +transpose(X,4) ) +transpose(X,7) ) +transpose((echo(X,4,6) |(X+transpose(X,7) ) ) ,12) ) +transpose((X+X) ,12) ) ,-7) ,7) ) ,4) ) +transpose(arpeggio(arpeggio(shuffle(transpose(transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,-5) ) ,4) ,-7) ) ) ) ,7) ) ,7) ) ,4) +transpose(step((((echo(((transpose(X,-7) +transpose(transpose(X,4) ,4) ) +transpose((transpose((X+X) ,4) |(transpose(X,-7) |shuffle(X) ) ) ,7) ) ,4,6) +transpose((step(((((arpeggio(X) |X) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose((transpose(X,-7) +(X|X) ) ,7) ) +(X|transpose(transpose(transpose(X,-7) ,-7) ,-7) ) ) ,12) +transpose((step(transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-7) ,12) |(transpose(((shuffle(X) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) +arpeggio((transpose(X,4) +transpose((step(X,12) +transpose(X,12) ) ,7) ) ) ) ) ,12) ) ,12) ) +transpose(arpeggio((transpose(transpose(X,-5) ,-5) +transpose((arpeggio(step((X+X) ,12) ) |((((X+transpose(X,7) ) |(X+X) ) +transpose((transpose(X,-7) |X) ,4) ) +transpose((transpose(X,4) +transpose(X,-7) ) ,7) ) ) ,7) ) ) ,7) ) +transpose((transpose(transpose(step((((shuffle(X) |X) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose((transpose(X,4) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,7) ) ,12) ,4) ,-7) +transpose((shuffle(((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ,12) ) ,-5) ) ,12) ,7) ) ,-5) ) +transpose((step((((step(((X+transpose(X,7) ) +X) ,12) +transpose(((X+transpose(transpose(X,-7) ,12) ) +arpeggio(X) ) ,7) ) +transpose(transpose((((X+transpose(((shuffle(X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose(((transpose(X,4) +transpose(((X+X) +arpeggio(X) ) ,12) ) +transpose(step(shuffle(step(X,12) ) ,12) ,7) ) ,7) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,-5) ,7) ) +transpose((((transpose(X,-5) +transpose(X,12) ) +transpose(((transpose(transpose(X,-7) ,-7) +transpose(step(echo(X,4,6) ,12) ,12) ) +(transpose(arpeggio(X) ,-5) +echo(X,4,6) ) ) ,4) ) +transpose(shuffle(step(transpose(X,-7) ,12) ) ,7) ) ,12) ) ,12) |(shuffle(((transpose(transpose(echo(((X+X) |X) ,4,6) ,-5) ,4) +echo((transpose(arpeggio(transpose(X,-5) ) ,-5) +((X+transpose(shuffle((step(X,12) +transpose(((X+X) +X) ,12) ) ) ,4) ) +transpose(shuffle((transpose((X+X) ,-5) +X) ) ,7) ) ) ,4,6) ) +step(echo(((shuffle(shuffle(X) ) +transpose(transpose(step((arpeggio(X) +transpose(transpose(X,4) ,12) ) ,12) ,-5) ,7) ) |(X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,12) ) ) +echo(((((arpeggio(((transpose(((X+transpose(X,7) ) +transpose(X,-7) ) ,-7) +transpose(arpeggio((((X+X) |echo(X,4,6) ) +(X|X) ) ) ,7) ) +echo((X+transpose((echo(X,4,6) |X) ,7) ) ,4,6) ) ) +shuffle((((X+transpose(X,7) ) +transpose(transpose((X|X) ,4) ,12) ) +transpose((X+transpose(X,7) ) ,12) ) ) ) |transpose((((transpose(transpose(((X|X) +transpose((arpeggio((X+X) ) +transpose(X,12) ) ,7) ) ,-7) ,-5) +transpose(step(X,12) ,7) ) +transpose(transpose((X+(step(echo(step(X,12) ,4,6) ,12) |(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |echo(transpose(shuffle(X) ,-5) ,4,6) ) ) ) ,-7) ,4) ) +transpose(((transpose(step((transpose((X|X) ,-5) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,12) ,-7) +transpose(((echo((X|X) ,4,6) +((X+X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(transpose(((shuffle(X) +transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ,-5) ,12) ) ,4) ) +transpose(transpose(transpose(arpeggio(X) ,-7) ,-7) ,7) ) ,7) ) ,4) ) +transpose(echo(transpose(transpose(arpeggio(((X+transpose(X,12) ) +transpose(X,-7) ) ) ,-7) ,4) ,4,6) ,12) ) +transpose((transpose(transpose(((transpose(X,4) +transpose((X+X) ,12) ) |arpeggio(X) ) ,-5) ,4) +transpose((step(step(((X+(X+transpose(X,12) ) ) |shuffle(X) ) ,12) ,12) +transpose(transpose((transpose(X,-5) +X) ,4) ,-5) ) ,12) ) ,-5) ) ,4,6) ) ) ,4) ) +transpose((transpose(transpose(shuffle(step(transpose((step((X+X) ,12) +transpose(arpeggio(arpeggio(X) ) ,12) ) ,-7) ,12) ) ,-5) ,4) |((shuffle(transpose(transpose(transpose((echo(transpose((transpose(X,4) +transpose(X,12) ) ,-5) ,4,6) +transpose(((X|X) +((X+transpose(X,12) ) +step((X+X) ,12) ) ) ,12) ) ,-7) ,-7) ,-7) ) +transpose(((step(transpose(((X+transpose(X,7) ) |(X|X) ) ,-7) ,12) +transpose(transpose((X+transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,4) ,12) ) +transpose(step((transpose(transpose(arpeggio(X) ,4) ,-7) |arpeggio((((X+transpose(X,-7) ) |transpose(X,4) ) |transpose(X,-7) ) ) ) ,12) ,7) ) ,4) ) +transpose(transpose((transpose((echo(transpose(((transpose(echo(X,4,6) ,4) |shuffle(X) ) |(X|transpose(X,-5) ) ) ,-7) ,4,6) +transpose((arpeggio(step(X,12) ) +transpose((transpose(transpose(X,-7) ,-5) +transpose(shuffle(transpose(X,4) ) ,7) ) ,12) ) ,12) ) ,4) +transpose((transpose(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ,-5) +transpose(((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) |(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) |transpose(X,-5) ) ) +transpose(transpose(step(X,12) ,4) ,-5) ) ,7) ) ,12) ) ,-7) ,7) ) ) ,7) ) +transpose(echo(step((transpose((shuffle(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose(((X|X) +transpose(transpose(X,-5) ,7) ) ,-7) ,4) ,7) ) ,4) +transpose(shuffle(((arpeggio(transpose((((X+transpose((X|X) ,4) ) +transpose((X+X) ,7) ) |echo(X,4,6) ) ,-7) ) +transpose(((((step((X+transpose(X,7) ) ,12) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,-5) ) +((echo((X|X) ,4,6) +transpose((X+X) ,4) ) |(echo(X,4,6) +transpose(step(X,12) ,-5) ) ) ) +transpose(echo(transpose(transpose(shuffle((X+X) ) ,4) ,-5) ,4,6) ,7) ) ,4) ) +transpose(arpeggio(step(((shuffle(echo(transpose(X,-5) ,4,6) ) +transpose((transpose((X+transpose(X,7) ) ,-5) +transpose(((X+transpose(X,12) ) |step(X,12) ) ,12) ) ,4) ) +transpose((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,7) ) ) ,12) ) ,12) ,4,6) ,4) ) +transpose(((transpose((step((step(transpose(echo(transpose((echo(X,4,6) |transpose(X,4) ) ,-5) ,4,6) ,-5) ,12) +transpose((transpose(transpose(X,-5) ,-7) +transpose((X+X) ,-5) ) ,-5) ) ,12) |(echo(((transpose(((X+(X+X) ) |transpose(X,4) ) ,4) +transpose(transpose((((X|transpose(X,4) ) +transpose((shuffle(X) +transpose(X,4) ) ,7) ) |(X|X) ) ,4) ,12) ) |transpose((echo(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,4,6) +transpose(((transpose(X,-5) |shuffle(X) ) |transpose(X,-5) ) ,12) ) ,4) ) ,4,6) +transpose(transpose(transpose(transpose(echo(transpose(X,4) ,4,6) ,4) ,-7) ,4) ,7) ) ) ,4) +transpose((echo(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ,4,6) +transpose(transpose(transpose(shuffle(((X|(X+transpose(X,12) ) ) |(X|X) ) ) ,-5) ,-7) ,7) ) ,4) ) +((transpose((shuffle(transpose(step(((transpose(X,-5) +transpose(X,7) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,12) ,-5) ) |shuffle(step((step((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) ,12) +transpose((transpose((X+transpose(X,12) ) ,-7) +((transpose(X,-5) |X) |step(X,12) ) ) ,12) ) ,12) ) ) ,4) +transpose(transpose((step(transpose(step((arpeggio(X) +transpose((((X+transpose(X,7) ) +X) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,12) ) ,12) ,-7) ,12) +transpose(echo(transpose(((step((X+X) ,12) +transpose(shuffle(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) ,4) ) +transpose(shuffle(arpeggio((X|X) ) ) ,7) ) ,4) ,4,6) ,12) ) ,-5) ,4) ) +transpose((((transpose(transpose(transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose(arpeggio(X) ,4) ) +transpose((((X+transpose(X,7) ) +transpose((arpeggio(X) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose((shuffle(X) +(X+transpose(X,12) ) ) ,7) ) ,7) ) ,-7) ,4) ,-5) +transpose((((((transpose(transpose(X,-7) ,-5) |(transpose((X+transpose(X,7) ) ,-7) +transpose(echo((X+transpose(X,7) ) ,4,6) ,12) ) ) +transpose(shuffle(X) ,7) ) +transpose((transpose(X,4) +transpose(shuffle(X) ,12) ) ,12) ) |(arpeggio((transpose(transpose(X,-7) ,-7) +(transpose(transpose(X,-7) ,4) +transpose((X+X) ,7) ) ) ) +transpose(arpeggio(transpose(transpose(echo((X+X) ,4,6) ,-5) ,-5) ) ,7) ) ) +arpeggio(((step((X|X) ,12) +arpeggio(transpose((X+(X+transpose(X,12) ) ) ,-5) ) ) +arpeggio((((X|X) +(X+X) ) |transpose(transpose(X,4) ,-5) ) ) ) ) ) ,4) ) +transpose(transpose((((arpeggio(transpose((shuffle((X|X) ) +transpose(((X|X) +transpose(X,12) ) ,12) ) ,-5) ) |echo((transpose(echo(echo(X,4,6) ,4,6) ,-7) +((X|X) +transpose(X,-7) ) ) ,4,6) ) +transpose(transpose((X+transpose(echo((echo(X,4,6) +X) ,4,6) ,7) ) ,-5) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,-5) ,7) ) |(transpose(transpose(echo(shuffle(((step(arpeggio(transpose((X|X) ,4) ) ,12) +transpose(arpeggio(X) ,4) ) +transpose(transpose(((transpose(X,-7) +transpose(X,12) ) +shuffle(X) ) ,-7) ,7) ) ) ,4,6) ,4) ,4) +transpose(echo((step((transpose((X+transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,-7) +transpose(step(arpeggio(step(echo(echo(X,4,6) ,4,6) ,12) ) ,12) ,7) ) ,12) +transpose(((transpose(transpose(arpeggio(X) ,-5) ,-7) +echo(arpeggio((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ) ,4,6) ) |transpose(step(transpose(X,-7) ,12) ,-5) ) ,12) ) ,4,6) ,7) ) ) ,7) ) ) ,7) ) ,7) ) ,12) random seed used was 248310337

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