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: echo((echo(arpeggio(transpose((shuffle((((transpose((transpose(transpose(((shuffle(X) |transpose(X,-7) ) +(X|X) ) ,4) ,4) +transpose(transpose((shuffle(((X+(X|X) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) ) |X) ,-7) ,7) ) ,-5) +(step(arpeggio(transpose(echo((transpose(X,-5) |(X|X) ) ,4,6) ,-7) ) ,12) +transpose(((((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose(X,7) ) ,-5) ) ) +((((echo((((transpose(X,-7) +transpose((X+step(X,12) ) ,12) ) |((transpose(X,4) +transpose(transpose(X,-5) ,12) ) |step(X,12) ) ) +(((arpeggio(X) |(X+transpose(X,7) ) ) +transpose(echo(X,4,6) ,7) ) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) ) ) ,4,6) +(transpose(arpeggio(transpose((X|X) ,4) ) ,-7) +transpose(shuffle(((step((transpose(X,4) +transpose(transpose(X,-5) ,7) ) ,12) +transpose((X|X) ,12) ) |arpeggio((transpose((X+transpose(X,12) ) ,4) +transpose((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,12) ) ) ) ) ,7) ) ) +transpose(step(arpeggio(echo((step(transpose((X+transpose(X,12) ) ,-7) ,12) +transpose(transpose(transpose(X,-5) ,4) ,12) ) ,4,6) ) ,12) ,4) ) +transpose(((transpose(transpose(transpose(arpeggio((X|transpose(X,4) ) ) ,4) ,-7) ,-5) +transpose(transpose(arpeggio(echo((transpose(X,-5) +transpose(transpose(X,4) ,12) ) ,4,6) ) ,4) ,4) ) +transpose(((echo(X,4,6) +transpose(step(transpose(X,-5) ,12) ,12) ) +(transpose((X|X) ,-5) +(X+X) ) ) ,7) ) ,7) ) +(transpose((arpeggio(echo(transpose(X,4) ,4,6) ) +transpose(step((transpose((X+X) ,-7) +X) ,12) ,7) ) ,-7) |echo(arpeggio(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) ,4,6) ) ) ) +transpose(step((transpose(shuffle(echo((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((transpose(transpose(X,-7) ,4) |shuffle((X+X) ) ) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) +transpose(((shuffle(X) |X) +transpose(shuffle(X) ,7) ) ,12) ) ,4,6) ) ,-7) +transpose(shuffle(transpose(((echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) +transpose(echo(X,4,6) ,4) ) +(((X|X) +X) +(transpose(X,-5) +transpose(echo(X,4,6) ,7) ) ) ) ,4) ) ,7) ) ,12) ,12) ) ) +transpose(echo(echo(arpeggio(transpose(transpose(((X+X) |transpose(X,-5) ) ,-7) ,-5) ) ,4,6) ,4,6) ,-5) ) ,-5) ) ,4,6) |transpose(shuffle(transpose((((((transpose((((X+X) +transpose(X,12) ) |((shuffle((X+transpose(X,12) ) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose((X|(X+X) ) ,-7) ,7) ) ) ,-7) +transpose((arpeggio(shuffle(X) ) +step((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,12) ) ,4) ) +transpose((transpose(((transpose(X,-7) +(X+transpose(X,12) ) ) +((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ) ,-7) +transpose(transpose(((arpeggio(X) +echo(X,4,6) ) +transpose(X,7) ) ,-5) ,7) ) ,7) ) +transpose(transpose(transpose(transpose((echo(X,4,6) |transpose(X,-5) ) ,-7) ,-5) ,-7) ,7) ) +shuffle((transpose(arpeggio(transpose(((X|X) +step(X,12) ) ,4) ) ,4) +transpose(echo(echo(transpose(X,-7) ,4,6) ,4,6) ,12) ) ) ) +transpose((transpose(step(transpose(transpose(((step(transpose(X,-7) ,12) +transpose(((X|X) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) ,7) ) ,-7) ,-7) ,12) ,4) +transpose((transpose(transpose(transpose(((X+transpose(X,12) ) +transpose(X,4) ) ,-7) ,4) ,4) +transpose(((((transpose(shuffle(X) ,-7) +transpose((X|X) ,-5) ) |echo(((X+transpose(X,7) ) +transpose(X,12) ) ,4,6) ) |transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ) +transpose((transpose(((shuffle(((X+X) +transpose(X,4) ) ) |arpeggio((X+transpose(X,7) ) ) ) +transpose(transpose((transpose(echo(X,4,6) ,-5) +transpose(X,7) ) ,-5) ,12) ) ,-7) +step((((transpose(transpose(arpeggio(X) ,4) ,4) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,12) ) ,12) ) ,7) ) ,12) ) ,12) ) ,-7) ) ,-7) ) ,4,6) random seed used was 2 NOTE: Generated phrase was too large ( 37000 ) , it has been truncated at 5000 notes. EXPR = ((transpose(transpose((((echo(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) ,4,6) +(shuffle((echo(X,4,6) +transpose((arpeggio(X) +(X|X) ) ,7) ) ) +transpose((X|X) ,-7) ) ) +transpose((step(transpose(((X+transpose(X,7) ) +transpose((X|X) ,12) ) ,-5) ,12) +((((arpeggio(X) +(shuffle(X) +transpose(arpeggio(X) ,12) ) ) +transpose((transpose((X+transpose(X,12) ) ,-5) +transpose(arpeggio(step(X,12) ) ,7) ) ,4) ) +transpose(step((echo(step(X,12) ,4,6) +transpose(((step(X,12) +transpose(transpose(X,4) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,12) ,7) ) |(((((X+transpose((X|X) ,7) ) |echo(X,4,6) ) +transpose(((arpeggio(transpose(X,-7) ) +transpose((X|X) ,4) ) +transpose((X|transpose(X,4) ) ,7) ) ,12) ) +transpose(((X+transpose((X|X) ,7) ) +transpose((X+X) ,12) ) ,4) ) +transpose(transpose((X+transpose((step(X,12) +echo(X,4,6) ) ,7) ) ,-7) ,7) ) ) ) ,4) ) +transpose(transpose(((transpose(step(X,12) ,-7) +transpose(arpeggio(X) ,7) ) +transpose(transpose((((((X|X) +transpose(arpeggio(X) ,4) ) +transpose(step(X,12) ,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((arpeggio(X) +transpose(transpose(X,4) ,12) ) ,7) ) ,4) ,7) ) ,4) ,7) ) ,4) ,-5) |echo((transpose((transpose((shuffle(transpose(((((X+transpose(transpose(X,4) ,7) ) +transpose(transpose(transpose((X|X) ,-5) ,4) ,7) ) +transpose(transpose((X+transpose(step((X+X) ,12) ,12) ) ,4) ,4) ) +transpose(transpose(transpose(((X|X) +transpose(X,7) ) ,4) ,-7) ,7) ) ,-5) ) +shuffle(transpose((X+X) ,4) ) ) ,-5) |transpose(transpose(((transpose(echo(step(((X+X) +transpose((echo(X,4,6) +(X+X) ) ,7) ) ,12) ,4,6) ,-7) +transpose(transpose(transpose(step((X+(X+transpose(X,7) ) ) ,12) ,4) ,4) ,4) ) +transpose(arpeggio((transpose(echo(transpose(arpeggio(X) ,-5) ,4,6) ,4) |transpose(shuffle(transpose(((X+transpose(X,7) ) |X) ,4) ) ,-5) ) ) ,7) ) ,-7) ,4) ) ,-7) +((transpose(((transpose(shuffle(((((transpose((transpose((X+transpose(X,7) ) ,4) +transpose((X|(X+transpose(X,7) ) ) ,7) ) ,4) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose(shuffle((((step(X,12) +X) +transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose((X|X) ,7) ) ) ,7) ) +(transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,-7) +(((transpose(X,4) +X) +transpose((X+transpose(X,7) ) ,7) ) |((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ) ) ) +transpose(transpose(transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ,4) ,12) ) ) ,-7) +transpose((transpose(transpose((((step(X,12) +X) |(transpose(X,4) +transpose(X,12) ) ) +transpose(step(transpose(X,-7) ,12) ,12) ) ,4) ,4) |(transpose(transpose(((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(transpose((X|transpose(X,4) ) ,4) ,7) ) ,-5) ,4) +shuffle(((((X+X) +X) +(X|X) ) +transpose((X|X) ,-5) ) ) ) ) ,4) ) +transpose(transpose((transpose(echo((X|X) ,4,6) ,-7) +transpose(((((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) |step((X|transpose(X,-5) ) ,12) ) ,7) ) ,-5) ,7) ) ,4) +transpose(((transpose(transpose(transpose(transpose((transpose(transpose(transpose(X,-5) ,4) ,-7) +transpose(step(shuffle(transpose(transpose(X,4) ,-7) ) ,12) ,7) ) ,-5) ,-5) ,4) ,-5) |(arpeggio((((((echo(X,4,6) +transpose((shuffle(X) +transpose(transpose(X,-7) ,12) ) ,12) ) |(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) |transpose(X,-7) ) +arpeggio((transpose(transpose(X,-7) ,4) +(transpose(X,4) |X) ) ) ) +transpose((step(X,12) +transpose(X,7) ) ,-7) ) ) +transpose(transpose(shuffle(arpeggio((transpose(echo(echo(X,4,6) ,4,6) ,4) +transpose(transpose(transpose(transpose(X,-7) ,-7) ,4) ,7) ) ) ) ,4) ,7) ) ) +transpose((transpose((step(((X|X) +transpose(((((X|X) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +shuffle(((X+X) +arpeggio(X) ) ) ) ,7) ) ,12) +arpeggio(transpose(X,-5) ) ) ,-5) +((transpose(transpose(shuffle(shuffle(X) ) ,4) ,4) +transpose(echo((transpose(transpose(X,-5) ,4) |(transpose(X,-5) +shuffle(X) ) ) ,4,6) ,4) ) +transpose(echo(((echo(echo(X,4,6) ,4,6) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,4) ) +transpose((X+shuffle(X) ) ,7) ) ,4,6) ,7) ) ) ,7) ) ,4) ) +transpose(shuffle(transpose(echo((transpose(echo((((X+transpose(X,12) ) +X) +transpose((X+X) ,7) ) ,4,6) ,-7) |arpeggio(((((X+transpose(X,12) ) +transpose((X|X) ,12) ) +X) +transpose((transpose(X,-7) +transpose(arpeggio(transpose(transpose(X,-7) ,-5) ) ,7) ) ,7) ) ) ) ,4,6) ,-7) ) ,7) ) ) ,4,6) ) |((transpose(transpose(transpose(transpose((step(transpose((transpose(step(transpose(((X+transpose(X,12) ) |(X|X) ) ,4) ,12) ,-5) +transpose(transpose(echo(transpose(echo(X,4,6) ,4) ,4,6) ,4) ,7) ) ,-5) ,12) +transpose(transpose(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) +transpose(transpose((transpose(X,-5) +(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(X,7) ) ) ,4) ,12) ) ,-5) ,7) ) ,-7) ,4) ,4) ,-7) +transpose(((transpose((transpose(((transpose((transpose(X,4) +transpose(transpose(X,4) ,12) ) ,4) +transpose(((echo(X,4,6) +transpose((X+X) ,12) ) |(X+transpose(X,-7) ) ) ,12) ) +(echo(transpose(X,-7) ,4,6) +transpose(((transpose(step(X,12) ,-7) +transpose(((X|X) +transpose(shuffle(X) ,12) ) ,4) ) +transpose(X,7) ) ,12) ) ) ,-5) +transpose(transpose((((((X+transpose(X,7) ) |(X+X) ) +transpose(shuffle(shuffle(X) ) ,12) ) +transpose(transpose((step(X,12) |X) ,-7) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,4) ,12) ) ,-7) +transpose(((((X+transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) ) ,12) ) +transpose((transpose((X|(X|X) ) ,-7) +transpose(shuffle(transpose((X|X) ,-7) ) ,12) ) ,12) ) +transpose(echo(((arpeggio(shuffle((X+transpose(X,7) ) ) ) +X) +transpose(arpeggio(transpose(arpeggio((X|X) ) ,4) ) ,7) ) ,4,6) ,4) ) +transpose(step(transpose(((transpose(transpose(transpose(X,4) ,-7) ,-5) +transpose(arpeggio(shuffle(X) ) ,4) ) +transpose((X+X) ,7) ) ,4) ,12) ,7) ) ,12) ) +transpose(arpeggio((arpeggio(transpose(step(X,12) ,-7) ) +(echo(transpose(((transpose(X,4) |(X+transpose(X,12) ) ) +echo(((arpeggio(X) +transpose(transpose(step(X,12) ,-5) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,4,6) ) ,-5) ,4,6) +arpeggio((transpose(arpeggio((X+transpose(X,12) ) ) ,-7) +((transpose(X,-5) +transpose(arpeggio((X+(X+transpose(X,12) ) ) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ) ) ) ) ) ,7) ) ,4) ) +transpose(((transpose(shuffle((step(((step((((((step(X,12) +transpose(transpose((X|X) ,4) ,7) ) +transpose(transpose((shuffle(X) +transpose(X,7) ) ,-5) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) +transpose((((transpose(X,4) +transpose(X,-7) ) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose(((transpose(transpose(X,-5) ,-7) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) |X) ,7) ) ,12) +transpose(transpose(transpose((transpose(X,4) +echo((X+transpose(X,7) ) ,4,6) ) ,4) ,4) ,4) ) +transpose((echo((transpose((X+transpose(X,7) ) ,-5) +transpose((X|(transpose(X,-7) +transpose(X,7) ) ) ,12) ) ,4,6) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,7) ) ,12) +transpose((((X+X) +transpose((X+X) ,12) ) +arpeggio(step(transpose(X,4) ,12) ) ) ,7) ) ) ,-5) +transpose(transpose(echo(transpose((((step(transpose(transpose(X,4) ,4) ,12) +transpose(transpose(transpose(arpeggio(X) ,-7) ,-7) ,12) ) +transpose(transpose(transpose((X+X) ,4) ,-5) ,12) ) |shuffle((((transpose(X,-5) +transpose((X|arpeggio(X) ) ,4) ) +transpose(X,7) ) |step((arpeggio(X) +(X+transpose(X,12) ) ) ,12) ) ) ) ,4) ,4,6) ,-5) ,4) ) +transpose(transpose((step(((transpose(arpeggio((((((X|X) +transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((X|transpose(X,4) ) ,12) ) |echo(X,4,6) ) ) ,-7) +transpose(((transpose(echo(((X|X) +transpose((X+X) ,7) ) ,4,6) ,4) |step(arpeggio(transpose(X,-5) ) ,12) ) +(arpeggio(X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((shuffle(X) |(X+transpose(X,7) ) ) ,7) ) ,12) ) ) ,12) ) +(transpose(echo((((X+transpose(X,12) ) +transpose(X,12) ) |X) ,4,6) ,-7) +(transpose((arpeggio(shuffle(transpose(echo(X,4,6) ,-5) ) ) +transpose((transpose(transpose(transpose(X,-5) ,-7) ,4) +transpose(X,-5) ) ,7) ) ,4) +transpose((((((arpeggio(X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) |(transpose((X+transpose(X,7) ) ,4) |transpose(X,-5) ) ) +transpose(transpose((X+X) ,-5) ,4) ) +transpose((transpose(transpose((X|X) ,-7) ,4) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ) ,7) ) ) ) ,12) |arpeggio((echo(echo(arpeggio(transpose(echo(transpose(X,-5) ,4,6) ,-5) ) ,4,6) ,4,6) +transpose(echo((transpose((((X|X) +transpose((X+transpose(X,12) ) ,12) ) +transpose(((((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,12) ) ,-5) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ,7) ) ,4,6) ,12) ) ) ) ,-5) ,7) ) ,7) ) ) random seed used was 0 NOTE: Generated phrase was too large ( 13632 ) , it has been truncated at 5000 notes. EXPR = shuffle((transpose(((((transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(shuffle(echo(transpose(X,4) ,4,6) ) ,7) ) ,-7) +transpose((transpose((((arpeggio(((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ) +step(((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose(((X|arpeggio(echo(X,4,6) ) ) |(X|X) ) ,4) ) +transpose(step(transpose((X+transpose(X,4) ) ,-7) ,12) ,7) ) ,-5) +transpose((((transpose(transpose(X,-7) ,-7) |shuffle(transpose(X,-5) ) ) +transpose(echo(step(X,12) ,4,6) ,4) ) +transpose(((((((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +transpose(step(transpose(X,-7) ,12) ,12) ) +step((X+transpose(X,7) ) ,12) ) +transpose(shuffle((arpeggio(X) |(echo(X,4,6) |(X+transpose(X,7) ) ) ) ) ,4) ) +transpose((transpose(((echo(X,4,6) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) |(X+transpose(X,7) ) ) ,7) ) ,7) ) ,12) ) ,7) ) +transpose((transpose((arpeggio(((shuffle(X) +X) +transpose(X,-7) ) ) +((transpose(X,-7) +transpose((shuffle(transpose(X,4) ) +X) ,4) ) +transpose(shuffle(X) ,7) ) ) ,-5) +transpose((transpose(((X|X) |transpose((transpose(echo(X,4,6) ,4) +transpose(X,-5) ) ,-7) ) ,4) +transpose((transpose(arpeggio(((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,-7) +transpose(transpose(X,4) ,7) ) ,12) ) ,4) ) ,4) ) +transpose(((((echo(transpose(transpose(X,-5) ,-7) ,4,6) |((transpose(echo(X,4,6) ,-5) +transpose(X,-5) ) +(transpose(X,-7) |(X+transpose(X,7) ) ) ) ) |((transpose(transpose((X+X) ,4) ,4) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,-5) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(transpose(echo(transpose((X|X) ,4) ,4,6) ,-7) ,12) ) ) |(((transpose((echo(X,4,6) +X) ,4) +transpose(step((((echo(X,4,6) |X) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose((transpose(X,4) +(X|X) ) ,7) ) ,12) ,7) ) +transpose((X|(X+step(X,12) ) ) ,4) ) +transpose(transpose(transpose(((X|X) |(transpose(X,4) +transpose(X,12) ) ) ,-7) ,-5) ,7) ) ) |shuffle(((((transpose(X,-5) +transpose(X,4) ) +transpose(echo(transpose(echo(X,4,6) ,-7) ,4,6) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) ) +transpose((((X+transpose(((step(X,12) +transpose(X,7) ) +transpose(transpose((X|X) ,-5) ,12) ) ,7) ) +transpose(step(transpose(transpose(X,4) ,4) ,12) ,4) ) +transpose((((transpose(((X+X) +(X+X) ) ,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((arpeggio(X) |X) +transpose(X,12) ) ,7) ) +transpose(echo(transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-5) ,4,6) ,7) ) ,7) ) ,7) ) ) ) ,7) ) |((transpose(shuffle(X) ,-7) +step(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,-5) ,12) ) +transpose(((transpose(((transpose((step(transpose(X,4) ,12) +(X+X) ) ,-7) +transpose(((X|X) |((transpose(X,-5) +transpose(((X+X) +transpose(X,12) ) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ) ,4) ) +transpose(transpose((X+transpose(arpeggio(X) ,12) ) ,-5) ,7) ) ,-7) +transpose(shuffle(transpose(step(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,12) ,-5) ) ,4) ) +transpose((((((((echo(arpeggio(shuffle(X) ) ,4,6) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |step(X,12) ) +(X+X) ) ,12) ) +transpose(transpose(transpose(shuffle(X) ,4) ,-5) ,4) ) +transpose(((transpose(X,4) +transpose(X,7) ) |(transpose(echo(X,4,6) ,-5) +(X+transpose(transpose(X,-5) ,12) ) ) ) ,7) ) +transpose(echo(((transpose(X,4) +(X+transpose(X,-5) ) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) ,4,6) ,4) ) +transpose((transpose(((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,-5) +echo(transpose(arpeggio(X) ,-7) ,4,6) ) ,7) ) +transpose(((shuffle((X+X) ) +transpose(((X+transpose(step(X,12) ,12) ) +transpose(arpeggio(X) ,7) ) ,7) ) |((arpeggio((X+transpose(arpeggio(X) ,12) ) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(echo(transpose((X+X) ,4) ,4,6) ,7) ) ) ,7) ) |((transpose(arpeggio(X) ,-7) +transpose((X+(X+X) ) ,4) ) +transpose(((X+transpose(X,7) ) +X) ,7) ) ) ,7) ) ,7) ) ) ,-5) +transpose(transpose((transpose(transpose(transpose(shuffle(shuffle((((transpose(echo(transpose(shuffle(((transpose(X,-7) +transpose(arpeggio(X) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,-7) ,4,6) ,-7) +transpose(transpose(step(transpose(transpose(echo(X,4,6) ,-7) ,4) ,12) ,-5) ,12) ) +transpose(((transpose(transpose((transpose(echo(X,4,6) ,4) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,4) ,-5) |(((X+transpose((X+X) ,7) ) +shuffle((X+transpose(X,12) ) ) ) +transpose(X,-7) ) ) +transpose((echo(echo(transpose((X+transpose(echo(X,4,6) ,12) ) ,4) ,4,6) ,4,6) |((step(arpeggio((X|X) ) ,12) +((X+transpose(X,7) ) +transpose(X,12) ) ) +echo((transpose((transpose(X,-5) |X) ,4) |X) ,4,6) ) ) ,12) ) ,4) ) +transpose(transpose((((X+transpose(step(arpeggio((X+X) ) ,12) ,7) ) +((transpose((X|X) ,-5) |(X+transpose(shuffle(arpeggio(X) ) ,12) ) ) |((transpose((X+transpose(X,12) ) ,-7) +(X+X) ) +transpose((transpose((X|X) ,4) |(X+X) ) ,7) ) ) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) ,-7) ,7) ) ) ) ,4) ,-5) ,-7) +transpose((arpeggio(((((((transpose((arpeggio(X) |(X+transpose(X,12) ) ) ,-5) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,7) ) |((arpeggio((transpose(X,-5) +X) ) +transpose((arpeggio(X) +X) ,4) ) +transpose(X,7) ) ) +transpose((arpeggio(X) +step((X+echo(X,4,6) ) ,12) ) ,12) ) +transpose((step(shuffle(arpeggio(step(X,12) ) ) ,12) +transpose(transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ,4) ,12) ) ,12) ) +transpose(transpose(shuffle((((X+transpose(X,7) ) +transpose(X,-5) ) |(X+(X|transpose(X,-5) ) ) ) ) ,-7) ,12) ) ) |echo(((((X+(((X+X) |arpeggio(X) ) +transpose(((transpose(X,-7) +(X+X) ) +(X+transpose(X,-5) ) ) ,12) ) ) |transpose((X+transpose(((transpose(X,-7) +transpose(X,4) ) +transpose((X|X) ,7) ) ,12) ) ,-7) ) +(arpeggio(((transpose((transpose(transpose(X,4) ,4) |((X+transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,-5) +(transpose((X+transpose(X,12) ) ,-7) +((transpose(X,4) +X) +(transpose(X,4) +(X|X) ) ) ) ) +transpose(step(transpose((((X+transpose(X,7) ) +transpose((transpose(X,4) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ,12) ,12) ) ) +((((((echo(transpose(X,4) ,4,6) |echo(X,4,6) ) +arpeggio(transpose(X,-5) ) ) +transpose(((X+((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) +transpose((((transpose(X,-7) |(X+transpose(X,7) ) ) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,12) ) ,4) ) +transpose(((arpeggio(X) +transpose((transpose(X,-7) +echo(X,4,6) ) ,7) ) +(X+transpose((X|X) ,12) ) ) ,7) ) |step(transpose(transpose(X,-5) ,-7) ,12) ) +transpose(transpose((transpose((transpose(X,-7) |X) ,-7) +transpose(echo((X+transpose(step(X,12) ,12) ) ,4,6) ,12) ) ,4) ,12) ) ) ) +transpose((((shuffle(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) ,4) ) |transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ,4) ) |step(arpeggio(((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(transpose(X,4) ,-7) ,12) ) ) ,12) ) +transpose(step(transpose(transpose(step(X,12) ,-5) ,-5) ,12) ,12) ) ,7) ) ,4,6) ) ,12) ) ,-5) ,12) ) ) random seed used was 0 EXPR = echo((arpeggio(arpeggio(transpose(transpose(echo((transpose(transpose(transpose(((X+transpose(((X|X) +(X+X) ) ,7) ) +((transpose(transpose(X,-5) ,-7) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) +transpose(X,4) ) ) ,4) ,4) ,-7) +transpose((shuffle((transpose(((X+X) +transpose(echo(X,4,6) ,7) ) ,-7) +transpose(transpose((shuffle(X) +transpose(((X+transpose(arpeggio(X) ,7) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,12) ) ,-5) ,12) ) ) +((step(((X|(X+X) ) |transpose(X,-5) ) ,12) +transpose(transpose((shuffle((X+transpose(X,7) ) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,12) ) +transpose(echo((((X|X) +transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,7) ) ) ,12) ) ,4,6) ,-5) ,4) ) ) +transpose(transpose(transpose((echo((transpose(((echo(echo(shuffle((X+transpose(X,7) ) ) ,4,6) ,4,6) |((((((X|X) +transpose(X,-7) ) +transpose((step(X,12) +transpose(transpose(X,4) ,12) ) ,-5) ) +transpose(transpose(X,4) ,4) ) +transpose((transpose(shuffle(X) ,4) +transpose(X,-7) ) ,7) ) +transpose(transpose(((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) +(step(X,12) +transpose(X,12) ) ) ,-7) ,7) ) ) +transpose((shuffle(transpose((arpeggio(X) +step((X+transpose(X,7) ) ,12) ) ,-5) ) +shuffle(transpose(X,-5) ) ) ,12) ) ,-7) +transpose((((transpose(((step(((((X+X) +transpose(X,-7) ) |((X+transpose(X,7) ) |step(X,12) ) ) +(echo(X,4,6) |X) ) ,12) +transpose(transpose(transpose(transpose((X+X) ,4) ,-7) ,-7) ,4) ) +transpose(((shuffle(X) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) +transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ,7) ) ,-7) |transpose(transpose(((X+transpose(X,7) ) +step(X,12) ) ,4) ,4) ) +transpose(transpose(echo(transpose(arpeggio(X) ,-7) ,4,6) ,-7) ,4) ) +transpose(transpose(transpose((((((((step(X,12) +((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ) +transpose((X|(X|X) ) ,7) ) +transpose(shuffle(transpose(arpeggio(transpose(X,4) ) ,-5) ) ,4) ) +transpose(shuffle(((step(X,12) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) |transpose(echo(echo(X,4,6) ,4,6) ,-5) ) +transpose(shuffle((echo((((step(X,12) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) |(((X|X) +transpose(echo(X,4,6) ,7) ) +transpose(step(X,12) ,7) ) ) ) ,4) ) +transpose((arpeggio((transpose(((X+X) |(X+X) ) ,-5) +((transpose(X,4) +transpose(echo((X|X) ,4,6) ,4) ) +transpose((X+X) ,7) ) ) ) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) ,7) ) ,-7) ,-5) ,7) ) ,7) ) ,4,6) +(((transpose((transpose(shuffle(((X|X) |transpose(X,-5) ) ) ,4) +transpose(((X|(X|(X|X) ) ) +transpose(arpeggio(X) ,-5) ) ,12) ) ,-5) +transpose(((((((transpose(X,4) +transpose((echo(X,4,6) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose(((X+transpose(X,12) ) +step(X,12) ) ,7) ) +step(X,12) ) |shuffle(transpose(((step(X,12) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ) ) +(shuffle(shuffle(X) ) |((echo(X,4,6) |X) +shuffle(((X+X) +X) ) ) ) ) +transpose(step((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) |(transpose(X,4) +transpose((X+X) ,12) ) ) ,12) ,12) ) ,7) ) +((step(((X+transpose((X|X) ,12) ) |X) ,12) |(step(step(transpose(transpose(X,-5) ,-5) ,12) ,12) +transpose(arpeggio(shuffle((X+transpose(arpeggio(transpose(X,4) ) ,12) ) ) ) ,7) ) ) +transpose(echo(((X+transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ,12) ) ) +(((transpose(transpose(step(transpose(X,-5) ,12) ,4) ,-7) +((transpose(X,-7) +(X+transpose(X,12) ) ) +transpose(transpose((X+X) ,-5) ,12) ) ) +(transpose(X,-7) +(((X|X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ) ) +transpose((transpose(((transpose(X,4) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) +transpose(echo(((((X+transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(transpose(X,-5) ,7) ) +X) ,4,6) ,12) ) ,12) ) ) ) ,-7) ,-7) ,7) ) ,4,6) random seed used was 0 NOTE: Generated phrase was too large ( 30960 ) , it has been truncated at 5000 notes.

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