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!
 Do you like this result? Do you want to let other people listen to it? Save this one in theTune Trove! See what's alreadyin the Tune Trove!

 After 20 generations the expression "X" became this: (((transpose((((step((((transpose(transpose(X,4) ,-5) +transpose(X,12) ) +transpose(((X+X) +shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose((step((X|X) ,12) +transpose(echo(X,4,6) ,7) ) ,7) ) ,12) +transpose(echo((step(X,12) +(X|X) ) ,4,6) ,12) ) +transpose((shuffle((echo(X,4,6) +transpose(shuffle(X) ,12) ) ) |(transpose(((((transpose(X,-5) |X) +transpose(step(shuffle(transpose(X,4) ) ,12) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) +(((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) ) ,-7) +transpose(shuffle(shuffle(transpose((X|X) ,4) ) ) ,12) ) ) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose((arpeggio(X) +echo(X,4,6) ) ,4) ,-5) ) +transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose((echo(X,4,6) +(X|X) ) ,7) ) +shuffle(echo(transpose(X,-7) ,4,6) ) ) ,7) ) ,7) ) ,4) +transpose(((transpose(step(X,12) ,-7) +step(arpeggio(echo(X,4,6) ) ,12) ) +echo(step(transpose(X,4) ,12) ,4,6) ) ,12) ) |transpose(arpeggio(transpose(((echo((echo(transpose(arpeggio(X) ,-7) ,4,6) +transpose(transpose(step(X,12) ,-7) ,12) ) ,4,6) +transpose(echo(transpose(transpose(X,4) ,-7) ,4,6) ,4) ) +transpose(transpose(((shuffle(X) +transpose(X,4) ) +transpose(arpeggio(((X+transpose(X,7) ) +(X+X) ) ) ,7) ) ,-7) ,7) ) ,-5) ) ,4) ) +transpose((echo(transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,12) ,-5) ,4,6) +(shuffle(shuffle(echo(arpeggio((arpeggio(shuffle(X) ) +transpose(shuffle(arpeggio(X) ) ,12) ) ) ,4,6) ) ) +(((shuffle((echo(step(arpeggio((transpose(X,-5) +transpose(transpose(X,-7) ,-7) ) ) ,12) ,4,6) |transpose(shuffle((X+transpose(echo(transpose(X,-7) ,4,6) ,12) ) ) ,4) ) ) +transpose((arpeggio(arpeggio(transpose(transpose(transpose(X,4) ,-7) ,4) ) ) +transpose(step(((((echo(transpose(X,4) ,4,6) |arpeggio(X) ) +transpose(step(shuffle(X) ,12) ,7) ) +transpose(shuffle(((X+transpose(X,12) ) +X) ) ,4) ) +transpose(((((((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ,4) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,12) ,12) ) ,7) ) +transpose(((echo(X,4,6) +transpose(shuffle(transpose((transpose(X,-5) +X) ,-5) ) ,12) ) |arpeggio(transpose(((((X|((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) +transpose(((shuffle(X) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(((X+transpose(X,7) ) +transpose((((X+transpose(X,12) ) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,7) ) +X) ,-5) ) ) ,4) ) +transpose(((((step(shuffle(transpose((transpose(X,4) |(X|X) ) ,-5) ) ,12) +transpose(step((transpose(step(X,12) ,-7) |arpeggio(step(X,12) ) ) ,12) ,7) ) +transpose((arpeggio((X+transpose(step(X,12) ,7) ) ) +(((X+X) +transpose(X,12) ) +transpose(((transpose(X,-7) |((X+transpose(X,12) ) +(X+transpose(X,7) ) ) ) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ) ,12) ) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,4) ) +transpose(echo(shuffle((((X|X) +transpose((X+transpose(X,7) ) ,12) ) |echo((X|(X|X) ) ,4,6) ) ) ,4,6) ,7) ) ,7) ) ) ) ,-5) ) random seed used was 59177543 EXPR = ((arpeggio((((echo(step(echo((echo(transpose(X,-5) ,4,6) +step(transpose(transpose(X,-5) ,-7) ,12) ) ,4,6) ,12) ,4,6) +transpose(arpeggio(echo(transpose(step(shuffle(((shuffle(transpose(X,-7) ) +((X+transpose(step(X,12) ,12) ) +transpose(((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) ) +transpose((echo(X,4,6) +transpose(((transpose(X,4) +transpose(shuffle(X) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ,-7) ) ) ,12) ,-5) ,4,6) ) ,4) ) +transpose(echo(((((shuffle(transpose(transpose(arpeggio(X) ,-7) ,4) ) +((shuffle(step(echo(transpose(shuffle((X|X) ) ,4) ,4,6) ,12) ) +transpose(transpose(step(arpeggio(transpose(arpeggio(X) ,-7) ) ,12) ,4) ,4) ) +transpose(((arpeggio(transpose(shuffle(((transpose(X,-7) +transpose(shuffle(X) ,4) ) +transpose((arpeggio(X) +X) ,7) ) ) ,4) ) +transpose(echo(transpose(step(transpose((X+transpose(echo(X,4,6) ,12) ) ,4) ,12) ,4) ,4,6) ,4) ) +transpose(echo(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) ,-5) ,4,6) ,7) ) ,7) ) ) +((transpose(arpeggio(((X|X) +transpose(X,12) ) ) ,4) +transpose(((transpose(step(shuffle(X) ,12) ,4) +transpose((arpeggio(shuffle(transpose(step(X,12) ,-5) ) ) +echo(((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,4,6) ) ,4) ) +transpose(step(transpose((X|X) ,4) ,12) ,7) ) ,7) ) +((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) +transpose(transpose(arpeggio(X) ,-7) ,4) ) ) ) +transpose(arpeggio((shuffle((transpose(((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(X,12) ) ,4) +transpose(transpose(step((X+transpose(X,7) ) ,12) ,4) ,12) ) ) +transpose(((transpose(transpose(arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,-7) ,-5) +transpose(step(arpeggio(echo(transpose(X,4) ,4,6) ) ,12) ,4) ) +transpose((arpeggio(X) +transpose((X+X) ,7) ) ,7) ) ,7) ) ) ,4) ) +transpose((echo(arpeggio(transpose((transpose(((X|X) |shuffle(X) ) ,4) |(transpose(shuffle(transpose(X,-7) ) ,4) +transpose(echo(X,4,6) ,12) ) ) ,4) ) ,4,6) +transpose((echo(echo(step(X,12) ,4,6) ,4,6) |step(shuffle(step((transpose(shuffle(X) ,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,12) ) ,7) ) ,7) ) ,4,6) ,7) ) +transpose(step(arpeggio(transpose(transpose(arpeggio(arpeggio(step(arpeggio((X+transpose(X,12) ) ) ,12) ) ) ,4) ,-5) ) ,12) ,7) ) ) +transpose(((step(transpose(echo(step((echo(transpose(step(transpose(transpose(X,4) ,4) ,12) ,-7) ,4,6) +((step(step(((transpose(X,-7) +transpose(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,4) ) +transpose(X,7) ) ,12) ,12) +(transpose(shuffle(step(arpeggio(transpose(X,4) ) ,12) ) ,-5) |echo((arpeggio(step(X,12) ) +transpose((step(X,12) +echo(X,4,6) ) ,12) ) ,4,6) ) ) +transpose(shuffle(step(transpose(X,-7) ,12) ) ,12) ) ) ,12) ,4,6) ,4) ,12) |echo(echo(arpeggio((step(transpose(step(X,12) ,-7) ,12) +arpeggio((echo(echo((X+transpose(X,12) ) ,4,6) ,4,6) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ) ) ) ,4,6) ,4,6) ) +transpose(transpose(transpose(arpeggio(transpose(transpose(echo(shuffle(arpeggio(step(transpose((X+transpose(X,12) ) ,-7) ,12) ) ) ,4,6) ,4) ,-5) ) ,-7) ,-5) ,12) ) ,4) ) +transpose((((((shuffle((((step((arpeggio((echo(X,4,6) |X) ) +echo(transpose(transpose(X,-7) ,-5) ,4,6) ) ,12) +transpose(step(echo((transpose(X,-5) |arpeggio(X) ) ,4,6) ,12) ,4) ) +transpose(((step(arpeggio(arpeggio(X) ) ,12) +step((X+transpose(X,12) ) ,12) ) +transpose((arpeggio(arpeggio(transpose(X,-7) ) ) +transpose((transpose(X,-7) |transpose((X|X) ,4) ) ,7) ) ,-7) ) ,7) ) +transpose((((echo(transpose(transpose(transpose(X,4) ,-5) ,4) ,4,6) +arpeggio(transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-7) ,-5) ) ) +transpose(step(X,12) ,4) ) +transpose(((transpose(transpose((arpeggio(transpose(X,4) ) +transpose(echo(((step(X,12) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,12) ) ,-5) ,4) +transpose(echo(transpose(transpose((shuffle(X) |X) ,-7) ,4) ,4,6) ,4) ) +transpose((((arpeggio((transpose(echo(X,4,6) ,-5) |((X+transpose(X,7) ) +transpose(X,7) ) ) ) +transpose(transpose(transpose(arpeggio(X) ,-7) ,-5) ,12) ) +transpose(transpose(transpose(step(arpeggio(X) ,12) ,-5) ,-5) ,4) ) +transpose((transpose(step(X,12) ,4) +transpose(transpose(((((X+X) +(X+transpose(X,7) ) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,-7) ,7) ) ,7) ) ,7) ) ,7) ) ,7) ) ) |echo(step(step(((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+step(X,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) +transpose(echo(step((X+(X+X) ) ,12) ,4,6) ,4) ) +transpose(((((X+(X|X) ) +transpose(shuffle(echo(echo(X,4,6) ,4,6) ) ,4) ) +transpose(((step(X,12) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) +(echo(transpose((X|X) ,-5) ,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ,7) ) ,12) ,12) ,4,6) ) +(((transpose(shuffle((arpeggio(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(echo(X,4,6) ,4) ) ) ,-5) |((((transpose(shuffle(X) ,4) |(((transpose(X,-5) +transpose(echo(X,4,6) ,12) ) +transpose(X,4) ) +transpose((echo(X,4,6) |X) ,7) ) ) |shuffle(transpose((echo(X,4,6) +transpose(((X|X) +transpose(echo(X,4,6) ,7) ) ,7) ) ,-5) ) ) +transpose(arpeggio(step(shuffle((shuffle(X) +step(X,12) ) ) ,12) ) ,4) ) +transpose((((arpeggio((((X+X) +transpose(echo(X,4,6) ,4) ) +transpose((X|X) ,7) ) ) |(X+transpose(X,7) ) ) +transpose(echo(step((X+transpose(X,12) ) ,12) ,4,6) ,4) ) +transpose(echo(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4,6) ,7) ) ,7) ) ) +transpose(arpeggio(step(step((X|X) ,12) ,12) ) ,-5) ) +(transpose(((arpeggio(X) +transpose((transpose(X,-7) +transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) +transpose(step(arpeggio(((arpeggio(echo(transpose(X,4) ,4,6) ) +transpose(echo(X,4,6) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X|X) +echo(X,4,6) ) ,7) ) ,7) ) ) ,12) ,7) ) ,-5) |(((shuffle((X+transpose(X,7) ) ) |((X+transpose((step(X,12) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +transpose(step(arpeggio(echo(echo(step(transpose(X,-5) ,12) ,4,6) ,4,6) ) ,12) ,12) ) +shuffle((echo(X,4,6) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) ) ) ) ) |transpose(step(transpose(arpeggio(step(arpeggio(transpose((step(X,12) +transpose(X,12) ) ,-7) ) ,12) ) ,4) ,12) ,-5) ) +transpose((step(step(((((transpose(((echo(echo(shuffle(((step((X+transpose(X,7) ) ,12) +transpose(step(shuffle(X) ,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4,6) ,4,6) +transpose(arpeggio(((step(echo(echo(X,4,6) ,4,6) ,12) +transpose(shuffle(echo(X,4,6) ) ,4) ) +transpose((X+(X+X) ) ,7) ) ) ,4) ) +transpose(arpeggio(transpose(transpose((transpose(step(X,12) ,-7) +shuffle(transpose(X,4) ) ) ,-5) ,-7) ) ,7) ) ,4) +transpose(transpose(((step(((X|X) +transpose((X+transpose(X,7) ) ,7) ) ,12) |arpeggio(transpose(step(X,12) ,4) ) ) +shuffle(X) ) ,-5) ,4) ) +transpose((((echo(arpeggio(echo(((echo(X,4,6) +transpose(step(X,12) ,4) ) +transpose((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ,7) ) ,4,6) ) ,4,6) +(((X|X) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ) +transpose(echo((arpeggio((((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) +transpose((transpose(echo(X,4,6) ,-5) |shuffle(arpeggio(X) ) ) ,4) ) ) +transpose(transpose(transpose((X+transpose(transpose(X,4) ,7) ) ,-5) ,4) ,4) ) ,4,6) ,4) ) +transpose(transpose((((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,-7) ,7) ) ,7) ) |shuffle(shuffle((((((X|X) +transpose(arpeggio(X) ,4) ) +transpose((((arpeggio(((X+transpose((X+X) ,4) ) +transpose((X|X) ,7) ) ) +transpose(shuffle(X) ,4) ) +transpose((transpose(echo(X,4,6) ,4) |X) ,7) ) +transpose(arpeggio(step((echo(X,4,6) |X) ,12) ) ,7) ) ,7) ) +transpose(echo(shuffle((X|X) ) ,4,6) ,4) ) +transpose(echo(step(((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose((X|(X+X) ) ,7) ) ,12) ,4,6) ,7) ) ) ) ) +transpose(arpeggio(echo((arpeggio(shuffle(X) ) |transpose(transpose((step((X+X) ,12) +echo(echo(X,4,6) ,4,6) ) ,4) ,-5) ) ,4,6) ) ,12) ) ,12) ,12) |transpose(transpose(transpose(((((shuffle(transpose(transpose(((arpeggio(step((X+X) ,12) ) +transpose(echo(echo(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4,6) ,4,6) ,4) ) +transpose(step(X,12) ,7) ) ,-7) ,-5) ) +transpose(step(step((echo(((((((X|X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) +transpose((((arpeggio(X) +transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) +transpose((shuffle(transpose(X,-7) ) +transpose((echo(X,4,6) +transpose(X,-5) ) ,7) ) ,12) ) ,12) ) ,4,6) +transpose(shuffle((shuffle((X+X) ) |(shuffle(X) +((step(X,12) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) ) ) ,12) ) ,12) ,12) ,4) ) +transpose(((((transpose(transpose(X,4) ,4) +transpose(transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,-5) ,12) ) +transpose(((((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |step(X,12) ) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose(step(shuffle(step(X,12) ) ,12) ,7) ) +step(echo(((((((X|X) +transpose((echo(X,4,6) |arpeggio(X) ) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) +(X+transpose(X,7) ) ) |shuffle(shuffle(X) ) ) +transpose(step(((((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ,12) ) ,4,6) ,12) ) ,7) ) +transpose(transpose(echo(((transpose(arpeggio(X) ,-5) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose(arpeggio((transpose(X,-5) +transpose(shuffle(X) ,7) ) ) ,7) ) ,4,6) ,-7) ,4) ) +transpose(transpose(echo(transpose(step(arpeggio(echo(X,4,6) ) ,12) ,4) ,4,6) ,-5) ,7) ) ,-7) ,4) ,-5) ) ,4) ) +transpose(step(((transpose(shuffle(((transpose(step(arpeggio(transpose((X+X) ,-7) ) ,12) ,4) +transpose(transpose(transpose(((transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) +transpose(transpose(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(step(X,12) ,7) ) ,4) ,7) ) |transpose(echo((step(X,12) +arpeggio(X) ) ,4,6) ,-7) ) ,-5) ,-5) ,4) ) +transpose(arpeggio((((X+transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) +(((arpeggio(X) +transpose((((X+X) +transpose((X+X) ,4) ) +transpose(X,7) ) ,7) ) +transpose((echo(X,4,6) |(X|X) ) ,4) ) +transpose(arpeggio(((X+X) +X) ) ,7) ) ) ) ,7) ) ) ,-5) +transpose(echo(transpose(transpose((((arpeggio((X+transpose(X,4) ) ) +transpose((echo(transpose((((X+transpose(echo(X,4,6) ,4) ) +transpose(step(X,12) ,7) ) +transpose(shuffle(X) ,12) ) ,-5) ,4,6) +transpose(transpose(X,-5) ,12) ) ,12) ) +transpose(step(arpeggio(((arpeggio((((X+X) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) ) +transpose(((((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) ,4) ) +transpose((shuffle(X) +arpeggio(shuffle(X) ) ) ,7) ) ) ,12) ,4) ) +transpose(echo(arpeggio(((transpose(transpose(transpose(X,-5) ,-7) ,4) +echo(transpose(X,-7) ,4,6) ) +transpose((echo(X,4,6) +arpeggio(arpeggio(X) ) ) ,-5) ) ) ,4,6) ,7) ) ,4) ,-5) ,4,6) ,4) ) +transpose(transpose(arpeggio(step((transpose(X,4) |transpose(((step(X,12) +arpeggio(echo(X,4,6) ) ) +transpose(transpose(shuffle(transpose((X+transpose(X,7) ) ,4) ) ,4) ,12) ) ,-5) ) ,12) ) ,-5) ,7) ) ,12) ,7) ) ,7) ) random seed used was 0 NOTE: Generated phrase was too large ( 21020 ) , it has been truncated at 5000 notes. EXPR = transpose(transpose((((echo(((echo(transpose(((((((arpeggio(X) |((((arpeggio(X) +transpose(X,4) ) +transpose(step(X,12) ,7) ) +transpose(((step((X+transpose(X,7) ) ,12) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose((arpeggio((X+X) ) |transpose((X|X) ,-5) ) ,7) ) ) +transpose(echo((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ,4,6) ,7) ) +transpose(((step(transpose(transpose((X|X) ,-7) ,-5) ,12) +transpose((echo(X,4,6) |(X|X) ) ,4) ) +transpose(transpose(step((arpeggio(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,-7) ,7) ) ,4) ) +transpose(transpose(transpose(transpose(arpeggio(shuffle(X) ) ,-5) ,-5) ,4) ,7) ) +transpose(step(echo(transpose(arpeggio(X) ,-5) ,4,6) ,12) ,4) ) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose(((((X|X) |X) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,7) ) ,7) ) ,-7) ,4,6) +transpose(transpose((shuffle(((arpeggio(X) |X) +transpose(X,-7) ) ) |(echo(X,4,6) +transpose(((step(X,12) +X) |shuffle(X) ) ,12) ) ) ,4) ,4) ) +transpose(shuffle(transpose((transpose(transpose(echo(transpose(echo(step((X+X) ,12) ,4,6) ,-5) ,4,6) ,-7) ,4) +shuffle(transpose((step(shuffle(step(X,12) ) ,12) +transpose(transpose(step(X,12) ,4) ,7) ) ,-7) ) ) ,-5) ) ,7) ) ,4,6) +transpose(((arpeggio(arpeggio(echo(((echo((X|X) ,4,6) +transpose(arpeggio(X) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) ) ) |((shuffle(arpeggio((step(X,12) +transpose(X,12) ) ) ) +transpose(((shuffle((X+transpose(X,12) ) ) +transpose((shuffle((transpose(arpeggio(X) ,-5) |arpeggio(X) ) ) +((echo(X,4,6) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) |step(X,12) ) ) ,4) ) +transpose(arpeggio(arpeggio(((X+X) +step((X+X) ,12) ) ) ) ,7) ) ,4) ) +transpose(((echo(transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4,6) ,4) ,4,6) +transpose(step(arpeggio(((step((X+transpose(X,7) ) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |echo(echo(shuffle((X|X) ) ,4,6) ,4,6) ) ) ,12) ,4) ) +transpose((shuffle((shuffle(X) +transpose(arpeggio(X) ,12) ) ) +transpose(echo((step(X,12) +shuffle((X+transpose(X,7) ) ) ) ,4,6) ,12) ) ,7) ) ,7) ) ) |echo(transpose(((step(echo(X,4,6) ,12) +transpose((echo(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4,6) +transpose(transpose(transpose(echo(transpose(X,-5) ,4,6) ,-5) ,-7) ,7) ) ,4) ) +transpose((transpose((X|X) ,-7) +((X+transpose(X,4) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ) ,7) ) ,-5) ,4,6) ) ,12) ) +transpose((shuffle(step(transpose(((((((echo(arpeggio(X) ,4,6) |transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(transpose((X+transpose((X|X) ,7) ) ,-7) ,-5) ,7) ) |transpose(transpose(arpeggio(X) ,-5) ,4) ) +transpose(transpose(((shuffle(((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose((X|X) ,7) ) ) |(arpeggio(arpeggio((X+X) ) ) +echo(shuffle(arpeggio(X) ) ,4,6) ) ) +transpose((step(transpose(step(step(X,12) ,12) ,-5) ,12) +transpose(((X+shuffle(transpose(X,4) ) ) |arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) ,7) ) ,12) ) ,4) ,4) ) +transpose((echo(transpose((X+transpose(arpeggio(transpose(X,-5) ) ,12) ) ,-5) ,4,6) +arpeggio((arpeggio(transpose(X,-7) ) |step(X,12) ) ) ) ,7) ) ,-5) ,12) ) +transpose(transpose(step(echo(transpose((((X+(X+transpose(X,-7) ) ) +transpose(step(step(X,12) ,12) ,7) ) |step(echo(step(X,12) ,4,6) ,12) ) ,-5) ,4,6) ,12) ,4) ,7) ) ,7) ) +shuffle(arpeggio(transpose(((((((echo((step(shuffle(X) ,12) +((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) ,4,6) |step((step(X,12) +step(X,12) ) ,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(step(step((X+transpose(X,12) ) ,12) ,12) ,7) ) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,4) ,7) ) |((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) ) +transpose(transpose(transpose(((shuffle(echo(X,4,6) ) +transpose(transpose(step(X,12) ,-7) ,4) ) +transpose(X,7) ) ,-5) ,-7) ,7) ) +transpose(transpose(shuffle((((transpose(echo(X,4,6) ,-7) +((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(step(X,12) ,4) ) +transpose(transpose(echo(transpose(X,4) ,4,6) ,-5) ,7) ) ) ,-5) ,7) ) ,4) ) ) ) ,-5) ,4) random seed used was 0 NOTE: Generated phrase was too large ( 10948 ) , it has been truncated at 5000 notes.

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