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 16 generations the expression "X" became this: ((transpose((arpeggio(shuffle(arpeggio((((step(X,12) +transpose(transpose(X,4) ,7) ) +transpose(transpose(arpeggio(transpose(X,-7) ) ,-7) ,7) ) |echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ,4,6) ) ) ) ) +transpose(transpose((arpeggio(echo(transpose(((shuffle(shuffle(arpeggio(X) ) ) +transpose(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(echo((X|X) ,4,6) ,7) ) ,4) ,4,6) ) +transpose((((step((step(X,12) |transpose(X,4) ) ,12) +((transpose(transpose(X,-5) ,-5) +transpose(transpose(X,4) ,4) ) +transpose(arpeggio((echo(X,4,6) |step(X,12) ) ) ,7) ) ) +transpose(arpeggio(X) ,-7) ) |(((((arpeggio(X) |echo((X+X) ,4,6) ) +transpose(step(X,12) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) |transpose(echo(X,4,6) ,-7) ) ) ,7) ) ,4) ,7) ) ,4) +transpose(((transpose(arpeggio(shuffle((echo(shuffle(step((((X+transpose(transpose(transpose(X,4) ,-5) ,7) ) +transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) ) +transpose((arpeggio(X) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,7) ) ,12) ) ,4,6) +shuffle(shuffle((arpeggio((X+transpose(X,7) ) ) +transpose((arpeggio(X) +transpose(X,7) ) ,7) ) ) ) ) ) ) ,-7) +transpose(step(transpose(echo(transpose(((shuffle(step(arpeggio((X+X) ) ,12) ) +transpose((transpose(echo(X,4,6) ,4) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose((shuffle(transpose(shuffle((X+X) ) ,-5) ) |transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ) ,7) ) ,4) ,4,6) ,4) ,12) ,4) ) +transpose(shuffle(step((((transpose((((((transpose(X,-5) |(X|X) ) +transpose(transpose(X,-5) ,4) ) +transpose((transpose((X+transpose(X,7) ) ,-5) +X) ,7) ) +transpose((transpose(X,4) +transpose(shuffle(shuffle(X) ) ,7) ) ,4) ) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,7) ) ,-7) +transpose(echo(arpeggio((X+X) ) ,4,6) ,7) ) +transpose(arpeggio(transpose(step((X+transpose(transpose(X,4) ,7) ) ,12) ,-7) ) ,4) ) +transpose((((((X+transpose(shuffle(X) ,12) ) +arpeggio(X) ) |(echo(X,4,6) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ) +transpose((((shuffle(step(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(((X|X) +transpose((X+X) ,7) ) ,7) ) ,4) ) +transpose((transpose(arpeggio(X) ,-7) +arpeggio((((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(arpeggio(X) ,12) ) +(arpeggio(shuffle((X+transpose(X,12) ) ) ) +X) ) ) ) ,7) ) ,7) ) ,12) ) ,7) ) ,12) ) +transpose(transpose(((((step((((step(((X+transpose(X,7) ) +transpose(X,7) ) ,12) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,12) +transpose((transpose(((X+transpose(X,7) ) |X) ,-5) +transpose(arpeggio(shuffle(shuffle(arpeggio(X) ) ) ) ,7) ) ,12) ) +transpose(((((step(echo((X+transpose(X,12) ) ,4,6) ,12) +transpose(X,4) ) +transpose(step(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,12) ,7) ) +transpose(((((transpose(transpose(shuffle(arpeggio(transpose(shuffle(X) ,-7) ) ) ,-7) ,-7) +transpose(step(step(echo(X,4,6) ,12) ,12) ,4) ) +transpose(echo(transpose((X|X) ,4) ,4,6) ,7) ) +transpose((transpose((echo(X,4,6) |X) ,-5) |arpeggio(((X+transpose(X,7) ) +arpeggio(X) ) ) ) ,4) ) +transpose(shuffle(((shuffle(X) +(arpeggio(shuffle(X) ) +transpose(X,7) ) ) +transpose((echo(((X|X) |step(X,12) ) ,4,6) +(X|shuffle(X) ) ) ,7) ) ) ,7) ) ,4) ) +transpose(((transpose(((transpose(step(X,12) ,4) +arpeggio(echo(X,4,6) ) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) +transpose(arpeggio(step(transpose(X,-7) ,12) ) ,4) ) +transpose(((transpose(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,-5) +transpose(echo(((transpose(X,-5) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose((((transpose((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo((X+transpose((X+X) ,7) ) ,4,6) ,7) ) +transpose(shuffle(X) ,7) ) ,7) ) ,7) ) ,7) ) ,7) ) +transpose((transpose((((((arpeggio(X) +transpose(arpeggio(X) ,12) ) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose((X+(X+transpose(X,7) ) ) ,7) ) +transpose(((shuffle(X) |transpose(X,4) ) |(arpeggio(X) +transpose((arpeggio(X) |step(X,12) ) ,7) ) ) ,7) ) +transpose((((X+transpose(X,12) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) |((X+transpose(transpose(X,-5) ,7) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ,-5) +step((step((((transpose(X,-5) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose(echo(shuffle(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) ,4,6) ,12) ) ,12) +transpose(transpose(((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) ,7) ) ,12) ) ,4) ) +transpose(step(transpose((step(transpose((step(echo(X,4,6) ,12) +X) ,4) ,12) +echo(((shuffle(transpose(X,-7) ) +transpose(shuffle((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(shuffle(echo(X,4,6) ) ,7) ) ) ,4) ) +transpose(((echo(X,4,6) +(((X+transpose(X,4) ) +transpose(X,7) ) |step(X,12) ) ) +transpose(transpose((transpose(shuffle(X) ,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,12) ) ,-7) ,7) ) ,7) ) ,4,6) ) ,-5) ,12) ,7) ) ,4) ,7) ) random seed used was 17 EXPR = (((step(((((echo(echo(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4,6) ,4,6) +transpose((((arpeggio(X) +transpose(echo(transpose(X,4) ,4,6) ,7) ) +transpose((arpeggio(arpeggio(echo(X,4,6) ) ) +echo(step(X,12) ,4,6) ) ,4) ) +transpose((((((X+transpose(X,7) ) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(step(X,12) ,4) ) +transpose(((transpose(X,-5) +transpose(X,12) ) +transpose(((X+X) +shuffle(X) ) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(((((X+transpose(X,7) ) +step(X,12) ) +X) |arpeggio(arpeggio(X) ) ) ,7) ) +transpose((X+transpose(arpeggio((transpose(shuffle(X) ,-5) +X) ) ,7) ) ,4) ) +transpose(arpeggio(transpose((((transpose((X+transpose(X,7) ) ,-5) |X) +transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,-5) ,7) ) ,-5) ) ,7) ) ,12) +transpose((echo(((((((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(step((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,4) ) +transpose((X+X) ,7) ) +transpose((((arpeggio(X) +transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) +((X+X) |(X+transpose(X,7) ) ) ) ,7) ) +transpose(arpeggio(step(((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,7) ) +((transpose((X+X) ,4) |step((X+transpose(X,7) ) ,12) ) +transpose((step((((transpose(X,-7) +transpose(echo(X,4,6) ,7) ) +transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,7) ) +(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) ,12) +transpose(transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,-5) ,7) ) ,7) ) ) ,4,6) +transpose(((((echo(transpose(arpeggio(transpose(((echo((X+X) ,4,6) +transpose((X+step(X,12) ) ,12) ) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,4) ) ,4) ,4,6) +transpose(arpeggio((transpose(step(X,12) ,-5) +transpose(arpeggio(X) ,12) ) ) ,4) ) +transpose((transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,-5) ,-5) +transpose(echo(((shuffle((X+transpose(X,7) ) ) +transpose(X,7) ) +transpose(echo(((transpose(transpose(X,-7) ,4) +transpose(X,4) ) +transpose(((X|X) +(X|X) ) ,7) ) ,4,6) ,7) ) ,4,6) ,7) ) ,7) ) +transpose(transpose(((step(transpose((step(X,12) +transpose(step(X,12) ,12) ) ,-5) ,12) +transpose(transpose((transpose((X+transpose(X,7) ) ,4) +transpose(transpose(X,4) ,12) ) ,4) ,12) ) +transpose((((step((shuffle(echo(X,4,6) ) +transpose(step(transpose(X,-5) ,12) ,7) ) ,12) +arpeggio(((transpose((X+transpose(X,12) ) ,-5) +transpose(step(X,12) ,4) ) +transpose((echo(X,4,6) |X) ,7) ) ) ) +transpose(arpeggio((echo((X+transpose((X|X) ,7) ) ,4,6) +transpose(((X+transpose(X,7) ) +transpose((X+X) ,12) ) ,12) ) ) ,4) ) +transpose(echo((echo(echo(X,4,6) ,4,6) +((shuffle(X) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,4,6) ,7) ) ,7) ) ,4) ,4) ) +transpose((arpeggio(arpeggio(shuffle((X+transpose(X,7) ) ) ) ) +shuffle(echo((((echo(X,4,6) +transpose((X+X) ,7) ) +transpose(((shuffle(X) +transpose(arpeggio(X) ,7) ) |echo(shuffle(X) ,4,6) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ) ) ,7) ) ,7) ) ,12) ) +transpose(transpose(transpose(((arpeggio(echo(((transpose(arpeggio(transpose(X,-7) ) ,-7) +transpose((((X|step(transpose(X,4) ,12) ) +echo(step(shuffle(X) ,12) ,4,6) ) +transpose((X+transpose(transpose(X,-5) ,7) ) ,4) ) ,7) ) +transpose(((transpose((transpose(X,-7) +transpose(echo(shuffle(arpeggio(X) ) ,4,6) ,7) ) ,-7) +transpose(transpose(transpose(transpose((step(X,12) |((step(X,12) +transpose(echo(X,4,6) ,7) ) +transpose(step((X|X) ,12) ,7) ) ) ,-7) ,-7) ,4) ,4) ) +transpose((((echo(X,4,6) +transpose(echo((transpose(X,4) +transpose(transpose((X+X) ,4) ,7) ) ,4,6) ,7) ) +transpose(transpose(transpose(shuffle((X+transpose(X,7) ) ) ,-5) ,4) ,7) ) +transpose((transpose(arpeggio(X) ,-5) +step(((echo(X,4,6) |echo(X,4,6) ) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,12) ) ,7) ) ,7) ) ,7) ) ,4,6) ) +transpose(arpeggio(transpose((shuffle((((((X+transpose(X,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) +transpose(transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) +transpose(((X|shuffle((X|X) ) ) +((X+transpose(X,4) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,12) ) ) +echo(transpose((arpeggio(step(X,12) ) +transpose(step(arpeggio(X) ,12) ,12) ) ,-5) ,4,6) ) ,4) ) ,4) ) +transpose((step(transpose(transpose(arpeggio(echo(echo(step(X,12) ,4,6) ,4,6) ) ,-5) ,-7) ,12) +transpose(shuffle((((echo((X+transpose(X,7) ) ,4,6) |echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ) +transpose(shuffle(X) ,4) ) +transpose((((X+(X+transpose(X,7) ) ) +(X+X) ) +(X+transpose(echo(X,4,6) ,7) ) ) ,7) ) ) ,12) ) ,7) ) ,-5) ,4) ,4) ) +transpose(((echo((((step(transpose(echo((((transpose(transpose(X,-5) ,4) +transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(X) ,7) ) |((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,-5) ,12) +transpose(echo((transpose(transpose(X,4) ,-5) +transpose(((X|(X+transpose(X,7) ) ) +transpose(((X|X) |(((X+X) +transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,12) ) ,4,6) ,7) ) +transpose(step(transpose(step(transpose(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,4) ,12) ,4) ,12) ,-5) ) +transpose((arpeggio(transpose(arpeggio(echo(X,4,6) ) ,-5) ) +transpose(echo(transpose(((transpose((((X+transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) +transpose((X+transpose(step(X,12) ,12) ) ,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) ,4) ,4,6) ,7) ) ,7) ) ,4,6) +transpose(transpose((shuffle((shuffle(shuffle(shuffle(X) ) ) +transpose(((((shuffle(X) +transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) +transpose(echo(arpeggio((X+X) ) ,4,6) ,7) ) |((arpeggio(((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(step(transpose(arpeggio(X) ,-5) ,12) ,4) ) +transpose(X,7) ) ) |(transpose(transpose(X,-7) ,4) +transpose((transpose(transpose(shuffle(X) ,-5) ,4) +echo(echo(transpose(X,-7) ,4,6) ,4,6) ) ,7) ) ) ,12) ) ) +step(((((X+X) +transpose((X+transpose(X,12) ) ,7) ) +transpose(X,4) ) +transpose((transpose((((X+(X+transpose(X,12) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) +transpose(arpeggio((echo(X,4,6) +transpose(shuffle(X) ,7) ) ) ,7) ) ,4) ) ,12) ) ,-7) ,4) ) +transpose(((step((((echo((arpeggio(X) +transpose(arpeggio(X) ,7) ) ,4,6) +((transpose(X,4) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ) +transpose(transpose((arpeggio(shuffle(X) ) +transpose(echo(echo(shuffle((X+transpose(X,12) ) ) ,4,6) ,4,6) ,7) ) ,4) ,4) ) +transpose((shuffle((echo(transpose(X,4) ,4,6) +((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) +transpose((transpose(arpeggio(step(X,12) ) ,-7) +transpose(transpose((X+X) ,-5) ,7) ) ,7) ) ,7) ) ,12) +(((transpose((arpeggio((step(arpeggio(X) ,12) +transpose((transpose(X,-5) +(X|X) ) ,12) ) ) +transpose(arpeggio(echo((X+transpose(X,12) ) ,4,6) ) ,12) ) ,4) +transpose((transpose(X,4) +transpose(arpeggio(shuffle(X) ) ,12) ) ,4) ) +transpose((((arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((shuffle((X+(X+X) ) ) +(X+transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ) ,4) ) +transpose(step((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) ,12) ,7) ) |echo(transpose(transpose(transpose(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,-7) ,-5) ,4) ,4,6) ) ,7) ) +transpose(transpose((transpose(step((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ,-7) +transpose(transpose((((arpeggio(((X+transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) +transpose(X,7) ) ,7) ) +((transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,-5) +transpose(((transpose(X,-7) +transpose(shuffle(X) ,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) ,-7) ,4) ) ,4) ,7) ) ) +transpose((transpose(((shuffle(transpose((step(transpose(X,4) ,12) +(X|((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(X,4) ,7) ) ) ) ,4) ) +transpose((((X+X) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ,4) ) +transpose(echo(transpose(((transpose((echo(X,4,6) |echo(step(X,12) ,4,6) ) ,4) +transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose(arpeggio((X+X) ) ,7) ) ,4) ,4,6) ,7) ) ,-7) |(transpose(shuffle(arpeggio(X) ) ,-7) +transpose(((echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) +transpose(((((X+X) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) |transpose(transpose(transpose(X,4) ,-7) ,4) ) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,7) ) ) ,12) ) ,7) ) ,7) ) random seed used was 0 NOTE: Generated phrase was too large ( 7275 ) , it has been truncated at 5000 notes. EXPR = (step(((echo((arpeggio(arpeggio((step((transpose(shuffle((X|X) ) ,-7) +echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,12) +(arpeggio(step(step(transpose(X,4) ,12) ,12) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ) ) ) ) +transpose((echo(step(transpose(step(echo(X,4,6) ,12) ,-7) ,12) ,4,6) +shuffle(arpeggio((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) ) ) ) ,7) ) ,4,6) +transpose((echo(((((((((X+transpose(X,7) ) |transpose(X,-7) ) +transpose(X,4) ) +transpose(((arpeggio(X) +transpose(shuffle(X) ,7) ) +transpose(shuffle(X) ,12) ) ,7) ) +transpose(shuffle(echo(X,4,6) ) ,12) ) +transpose(shuffle(((step(X,12) +transpose(echo(X,4,6) ,4) ) +transpose((transpose(transpose(X,4) ,-5) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,7) ) ) ,4) ) +transpose((((step(X,12) |shuffle(X) ) +transpose(((echo(X,4,6) +X) +transpose((X+X) ,12) ) ,7) ) |transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,-7) ) ,7) ) +(arpeggio((arpeggio(echo((arpeggio(X) +transpose(X,7) ) ,4,6) ) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,4) ,7) ) ) +transpose(((shuffle(((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(arpeggio(X) ,4) ) +transpose((transpose(X,4) +transpose(transpose(X,4) ,7) ) ,7) ) ) +transpose(step(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ,7) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ,-7) ) ) ,4,6) +transpose(step(echo(((echo((X+transpose(X,12) ) ,4,6) |((X+transpose((X|X) ,4) ) +transpose((X+X) ,7) ) ) |((transpose(X,-5) |echo(X,4,6) ) +echo(X,4,6) ) ) ,4,6) ,12) ,7) ) ,12) ) +transpose((echo(transpose((transpose(echo(((((((shuffle(arpeggio(X) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) +transpose(shuffle(((echo(X,4,6) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) ) +transpose(shuffle(X) ,7) ) +echo(shuffle(((shuffle(X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ) ,4,6) ) +transpose(echo(step((X+X) ,12) ,4,6) ,4) ) +transpose(echo((transpose(X,4) +transpose(X,-7) ) ,4,6) ,7) ) ,4,6) ,-5) |((transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(X,4) ,7) ) ,-5) +transpose((((X+transpose(shuffle((X+X) ) ,12) ) |(X|echo(X,4,6) ) ) +step(arpeggio(arpeggio(transpose(X,-5) ) ) ,12) ) ,7) ) +transpose(step(((((shuffle(step(X,12) ) +transpose(transpose(transpose(((X+transpose(X,12) ) |transpose(X,-5) ) ,4) ,-7) ,4) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ,7) ) +transpose(shuffle(arpeggio(shuffle(X) ) ) ,7) ) +transpose((shuffle(X) |arpeggio(step(X,12) ) ) ,-5) ) ,12) ,7) ) ) ,-7) ,4,6) +transpose(step((arpeggio(((echo(echo((echo(X,4,6) |(shuffle(X) +transpose(transpose(X,-5) ,12) ) ) ,4,6) ,4,6) +transpose(((((echo(transpose(X,4) ,4,6) +transpose(arpeggio(((X+X) +X) ) ,4) ) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose((X+X) ,7) ) ,7) ) +transpose(arpeggio(X) ,4) ) +transpose(arpeggio((shuffle(X) +step(transpose(X,-5) ,12) ) ) ,7) ) ,7) ) |transpose((arpeggio(echo(arpeggio(X) ,4,6) ) +transpose(shuffle((echo(shuffle(X) ,4,6) +transpose(X,12) ) ) ,7) ) ,-5) ) ) +step(echo(arpeggio(step((shuffle(arpeggio(((X+X) |arpeggio(X) ) ) ) |echo((X+(X+transpose(X,7) ) ) ,4,6) ) ,12) ) ,4,6) ,12) ) ,12) ,7) ) ,7) ) ,12) |(((transpose((((transpose(step(transpose(arpeggio(X) ,-5) ,12) ,-5) +transpose(echo(transpose(echo(step(X,12) ,4,6) ,-7) ,4,6) ,4) ) +transpose(((((echo((((X+transpose(X,4) ) +transpose(X,7) ) |arpeggio(X) ) ,4,6) +transpose(transpose(((X+transpose(X,7) ) +arpeggio(X) ) ,4) ,4) ) +transpose(transpose(step(arpeggio(X) ,12) ,4) ,7) ) +transpose(shuffle(echo((X+transpose(X,7) ) ,4,6) ) ,4) ) +transpose(echo(transpose((transpose(X,-7) +shuffle((X+X) ) ) ,4) ,4,6) ,7) ) ,7) ) +transpose(transpose(echo(transpose((echo(X,4,6) +transpose(echo(arpeggio(X) ,4,6) ,12) ) ,-7) ,4,6) ,-5) ,12) ) ,4) +transpose(transpose(transpose(shuffle(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) ,-7) ,-5) ,4) ) +transpose(((((shuffle(echo(transpose(X,-5) ,4,6) ) |shuffle((arpeggio(X) +transpose(X,7) ) ) ) +transpose(shuffle(shuffle(arpeggio((X|X) ) ) ) ,7) ) +transpose(((transpose(arpeggio(transpose(step(X,12) ,-5) ) ,4) |arpeggio((X|X) ) ) +transpose(((shuffle((transpose(X,-5) +transpose(step(arpeggio(X) ,12) ,7) ) ) +transpose(step(transpose((arpeggio(X) +transpose(shuffle(transpose(X,4) ) ,7) ) ,4) ,12) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,7) ) |((step((X|step(X,12) ) ,12) +transpose((transpose(((arpeggio(transpose(echo(X,4,6) ,-7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((transpose(echo(echo(X,4,6) ,4,6) ,-5) +transpose(arpeggio((X+X) ) ,12) ) ,7) ) ,-7) +echo(X,4,6) ) ,4) ) +transpose((echo(step(step((X|X) ,12) ,12) ,4,6) +transpose((echo(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |X) ,4) ,4,6) +transpose(arpeggio(step(echo(arpeggio(X) ,4,6) ,12) ) ,7) ) ,7) ) ,7) ) ) ,7) ) +transpose((step(echo((transpose(arpeggio((transpose(X,-5) +transpose(step((echo(X,4,6) +X) ,12) ,12) ) ) ,-7) +(((echo(echo(X,4,6) ,4,6) |(echo((X+transpose(X,7) ) ,4,6) +transpose(transpose(X,-5) ,7) ) ) |((step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,12) +transpose((transpose(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ,-7) +step((transpose(X,-5) |arpeggio(X) ) ,12) ) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) ) |((((((X+transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(((shuffle(X) +transpose(transpose(X,4) ,12) ) |(X+X) ) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,7) ) +(echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) |echo((X+transpose(echo(X,4,6) ,7) ) ,4,6) ) ) +(((X+transpose(step(transpose(X,-7) ,12) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,12) ) |(((arpeggio(X) |((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) +transpose(echo(echo(transpose(X,-5) ,4,6) ,4,6) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ) ,12) ) ) ) ) ,4,6) ,12) +transpose(transpose((((((X|X) +transpose((X+transpose((X|X) ,7) ) ,7) ) +transpose(arpeggio((echo(X,4,6) +transpose(((X+transpose(X,7) ) |shuffle((X+transpose(X,7) ) ) ) ,12) ) ) ,4) ) +transpose(echo(step(transpose(X,-5) ,12) ,4,6) ,7) ) +transpose((echo((step(X,12) +transpose(X,7) ) ,4,6) +echo(arpeggio(echo(shuffle(X) ,4,6) ) ,4,6) ) ,7) ) ,4) ,12) ) ,7) ) ) random seed used was 0 NOTE: Generated phrase was too large ( 10185 ) , it has been truncated at 5000 notes. EXPR = (((step(((echo(step((echo((transpose(((echo((X+transpose(X,7) ) ,4,6) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ,-5) +transpose(X,7) ) ,4,6) +(((arpeggio(step((X+transpose(X,7) ) ,12) ) +transpose((X+transpose((transpose(X,4) |(X+transpose(X,12) ) ) ,7) ) ,4) ) +transpose(shuffle((arpeggio(X) +X) ) ,7) ) +transpose(step(step(transpose(arpeggio(shuffle(X) ) ,-5) ,12) ,12) ,12) ) ) ,12) ,4,6) +transpose(transpose((transpose((arpeggio(transpose(shuffle(shuffle(X) ) ,4) ) +echo(((((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +((arpeggio(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) +transpose((((X+X) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,4,6) ) ,4) +step(arpeggio(step(transpose(((transpose(X,4) +transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ,12) ) ,12) ) ,4) ,12) ) |step((echo(X,4,6) +transpose((arpeggio((X+transpose(X,7) ) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,12) ) ,12) +transpose(transpose(echo(arpeggio(transpose(transpose(((shuffle(((X|shuffle(X) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(arpeggio(transpose(((arpeggio(X) +transpose(echo(X,4,6) ,7) ) +((transpose(X,4) +transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,4) ) ,12) ) |((transpose((shuffle(X) +transpose(X,7) ) ,4) +transpose(((transpose(transpose(X,-5) ,4) +transpose(step(step(X,12) ,12) ,4) ) +transpose(transpose((shuffle(X) |X) ,-7) ,7) ) ,4) ) +transpose(transpose(echo(shuffle(transpose(X,4) ) ,4,6) ,-7) ,7) ) ) ,-5) ,-5) ) ,4,6) ,-7) ,4) ) +transpose(transpose(arpeggio(shuffle(((transpose(step(step(shuffle(X) ,12) ,12) ,-5) +step(((X+transpose(arpeggio(step(shuffle(step(X,12) ) ,12) ) ,4) ) +transpose(echo(arpeggio(shuffle(X) ) ,4,6) ,7) ) ,12) ) +(((arpeggio(transpose((X|transpose(X,-7) ) ,-5) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(step(echo(X,4,6) ,12) ) ,7) ) +transpose(transpose(((X+transpose(X,7) ) +X) ,-5) ,12) ) ) ) ) ,-5) ,7) ) +step(((transpose((shuffle(arpeggio(arpeggio(transpose((X+transpose(X,7) ) ,4) ) ) ) |((echo(transpose(step((echo(X,4,6) +transpose(shuffle(X) ,7) ) ,12) ,-5) ,4,6) +transpose(((((X+transpose(transpose(X,4) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) +transpose(shuffle((X+X) ) ,7) ) ,4) ) +transpose((transpose(transpose((transpose(X,4) +transpose(step(X,12) ,7) ) ,4) ,-5) |(X+((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ) ) ,7) ) ,4) ) +transpose((transpose((transpose(arpeggio(X) ,4) +transpose(step((X+X) ,12) ,7) ) ,-7) |transpose((step(X,12) +transpose((shuffle(X) +transpose(X,7) ) ,7) ) ,4) ) ,7) ) ) ,4) +transpose((transpose((echo(arpeggio(X) ,4,6) |(((X+transpose(shuffle((X+X) ) ,7) ) +transpose(X,4) ) +transpose((transpose(X,-7) +transpose(step(X,12) ,7) ) ,7) ) ) ,4) +transpose((echo((((step((((X+transpose(X,7) ) +transpose((X|shuffle(X) ) ,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,12) +transpose(arpeggio(transpose(((echo(X,4,6) +transpose(echo((X|X) ,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) ,4) ) +transpose((transpose((echo(arpeggio(X) ,4,6) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ,4) +transpose(arpeggio(step((X+X) ,12) ) ,7) ) ,7) ) |((arpeggio((X+transpose(X,7) ) ) +transpose(echo(transpose((X+transpose((echo(X,4,6) +transpose(X,12) ) ,7) ) ,4) ,4,6) ,4) ) +transpose(shuffle((X|(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ) ) ,7) ) ) ,4,6) +transpose(echo(echo(step(X,12) ,4,6) ,4,6) ,12) ) ,7) ) ,4) ) +transpose(((((echo(transpose(transpose((X|X) ,-5) ,-7) ,4,6) +transpose((shuffle(echo(X,4,6) ) |transpose(X,4) ) ,7) ) +transpose(((transpose(step(X,12) ,-5) +transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ,12) ) +(echo(transpose(X,-7) ,4,6) +shuffle(transpose(X,4) ) ) ) |((shuffle((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose(X,12) ) ) +transpose((echo(((transpose(transpose(X,4) ,-7) +transpose((step(X,12) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) +transpose(arpeggio(shuffle(step((X+X) ,12) ) ) ,7) ) ,4) ) +transpose(arpeggio(transpose(echo(shuffle(X) ,4,6) ,-7) ) ,7) ) ) ,7) ) ,12) ) random seed used was 0

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