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 18 generations the expression "X" became this: ((((echo((((shuffle(shuffle((X|((shuffle(X) +transpose(arpeggio(X) ,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ) +transpose(transpose(arpeggio((transpose(echo(transpose((X|X) ,-5) ,4,6) ,-7) +transpose((X+transpose(step(X,12) ,12) ) ,7) ) ) ,-5) ,4) ) +transpose(((transpose((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-7) +transpose(transpose((((transpose((X+transpose(X,12) ) ,-5) +transpose(echo(transpose(X,4) ,4,6) ,12) ) +transpose((transpose(X,4) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,4) ) +transpose(((echo(transpose(transpose(X,-7) ,-7) ,4,6) +transpose((arpeggio(X) +transpose(transpose((X|echo((X|X) ,4,6) ) ,-7) ,7) ) ,4) ) +transpose(transpose(((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,4) ,7) ) ,7) ) ,7) ) |(((((((transpose(X,-7) +X) |(((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(X,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ) +transpose((echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) |(echo((X|X) ,4,6) +transpose(step(step(X,12) ,12) ,7) ) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(((X+transpose(step(transpose(X,-5) ,12) ,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose((transpose((X|X) ,4) +transpose((echo(arpeggio(X) ,4,6) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ,7) ) ,7) ) +((step((echo(shuffle((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,4,6) |transpose((transpose((X|X) ,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) ,12) +transpose(shuffle(transpose(step(shuffle(X) ,12) ,4) ) ,4) ) +transpose((shuffle(transpose((X|X) ,-7) ) +transpose((((arpeggio(step(X,12) ) +transpose(step(shuffle(X) ,12) ,12) ) |echo(transpose(X,4) ,4,6) ) +transpose((transpose(X,4) |transpose(X,-5) ) ,7) ) ,7) ) ,7) ) ) ) ,4,6) +(((((shuffle((((X+transpose((X+transpose(X,7) ) ,12) ) |(X+transpose((X+transpose(X,12) ) ,12) ) ) |arpeggio(echo(transpose(step((X|X) ,12) ,4) ,4,6) ) ) ) +transpose(transpose(transpose(((transpose(step((X|X) ,12) ,4) +transpose((echo(transpose(X,-5) ,4,6) +transpose(transpose(transpose(shuffle((step(X,12) |transpose(X,4) ) ) ,-5) ,4) ,12) ) ,7) ) |((((transpose((echo(X,4,6) +transpose(arpeggio(X) ,12) ) ,-5) |X) +transpose((((X|X) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) |step(transpose((X|X) ,4) ,12) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose((transpose(echo(X,4,6) ,-7) +transpose((transpose((X+transpose(echo(X,4,6) ,7) ) ,-5) +transpose(step(step(X,12) ,12) ,12) ) ,12) ) ,7) ) ) ,-5) ,4) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) +transpose((transpose(((arpeggio(((echo(shuffle(X) ,4,6) |transpose(X,-7) ) +(transpose(arpeggio(transpose(X,-5) ) ,-5) +step((transpose(X,-5) |X) ,12) ) ) ) +transpose(transpose(step((shuffle((transpose(X,-7) +transpose(transpose(X,4) ,7) ) ) |transpose(step(X,12) ,-5) ) ,12) ,4) ,4) ) +transpose(echo(echo((echo(transpose(X,4) ,4,6) +transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ,4,6) ,4,6) ,7) ) ,-7) +transpose(echo(arpeggio(arpeggio(shuffle((echo(X,4,6) |((transpose(X,-7) +transpose(X,4) ) +transpose((X+X) ,7) ) ) ) ) ) ,4,6) ,7) ) ,4) ) +transpose((transpose((echo(transpose((X|X) ,4) ,4,6) +transpose(step(echo(X,4,6) ,12) ,12) ) ,-5) +transpose(transpose(((transpose(X,-7) +transpose((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose((transpose((transpose(X,4) +transpose(X,7) ) ,-5) +transpose(transpose(X,-5) ,12) ) ,7) ) ,-5) ,7) ) ,4) ) +transpose(transpose(((((((transpose(X,-7) |X) +transpose(transpose(step((X|X) ,12) ,-5) ,12) ) +transpose(arpeggio(step((X+transpose(X,12) ) ,12) ) ,-5) ) +transpose((transpose((X|transpose(shuffle(X) ,-7) ) ,-7) +transpose(transpose((shuffle(X) |X) ,4) ,12) ) ,7) ) +transpose(((((X+transpose(arpeggio(X) ,12) ) +transpose(step(X,12) ,7) ) |transpose(transpose(X,-5) ,-5) ) +transpose(((((X+transpose(X,12) ) |shuffle(X) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,12) ) ,4) ) +transpose(transpose(transpose(shuffle(transpose(arpeggio(transpose(((X+transpose(X,12) ) |X) ,-5) ) ,4) ) ,-5) ,4) ,7) ) ,-5) ,7) ) ) |transpose(step(step(transpose((step((step(transpose((X+transpose(X,7) ) ,-5) ,12) +arpeggio(X) ) ,12) +transpose(((X|shuffle((transpose(X,4) +transpose((X|transpose(X,4) ) ,12) ) ) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) ,12) ) ,4) ,12) ,12) ,-5) ) +transpose((echo(((echo((transpose((X|shuffle(X) ) ,-5) |((transpose((X+transpose(transpose((X|X) ,-5) ,7) ) ,-5) +transpose(transpose(transpose((X+X) ,4) ,-7) ,4) ) +transpose(shuffle(X) ,7) ) ) ,4,6) +transpose((((shuffle((transpose(X,-7) |((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ) ) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,4) ,7) ) +transpose((transpose(shuffle(X) ,-7) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,4) ,7) ) ,12) ) +(transpose((X|X) ,-7) |echo(arpeggio(echo(X,4,6) ) ,4,6) ) ) ,4,6) +transpose(((step(transpose((((transpose((transpose((X|X) ,-7) +transpose((X+transpose(X,12) ) ,7) ) ,4) +transpose(transpose(((transpose((X+X) ,-7) +transpose(shuffle(X) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,4) ,4) ) +transpose((transpose((transpose(echo(transpose(X,-7) ,4,6) ,-5) |((shuffle(X) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(transpose(step(transpose(X,4) ,12) ,4) ,7) ) ) ,-7) |transpose((((transpose((X+X) ,-7) +arpeggio(X) ) +transpose(step((X+transpose(X,12) ) ,12) ,4) ) +transpose(transpose((echo((X+X) ,4,6) +transpose((transpose(X,-7) |(X+transpose(X,12) ) ) ,12) ) ,-7) ,7) ) ,-5) ) ,12) ) +transpose(transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |(transpose(transpose(echo(X,4,6) ,4) ,4) +shuffle(X) ) ) +shuffle(step(arpeggio(X) ,12) ) ) ,-5) ,7) ) ,-5) ,12) +transpose(transpose(transpose(transpose(((X|(X|X) ) +transpose(((echo(X,4,6) +transpose((transpose(X,4) |echo(X,4,6) ) ,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,4) ,4) ,-5) ,4) ) +transpose(((shuffle(transpose((arpeggio(X) +X) ,-5) ) +transpose(((X+transpose(transpose(X,-5) ,12) ) |step(X,12) ) ,12) ) |shuffle(((X+transpose(X,7) ) |transpose((X+transpose(X,7) ) ,4) ) ) ) ,7) ) ,7) ) ,12) ) +transpose(((step((step(transpose((step((transpose(shuffle(X) ,-5) +transpose(arpeggio(transpose(transpose(X,4) ,-5) ) ,12) ) ,12) +transpose(transpose(echo(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ,4,6) ,4) ,7) ) ,-5) ,12) |((transpose(transpose(echo((transpose(X,-7) |X) ,4,6) ,4) ,-7) +transpose(shuffle(((transpose(((arpeggio((X+transpose(X,12) ) ) +step(transpose(X,4) ,12) ) +transpose(transpose((shuffle(X) +X) ,-5) ,7) ) ,-5) +transpose(transpose((step(X,12) +(X|(X+transpose(X,7) ) ) ) ,-5) ,7) ) |((transpose(X,-5) +transpose(step((((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,12) ,7) ) +transpose((((((X|X) +transpose(X,4) ) |X) +transpose(arpeggio(arpeggio(transpose(X,-5) ) ) ,7) ) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,7) ) ) ) ,4) ) +transpose(echo(((shuffle(((((echo(X,4,6) |transpose(X,-5) ) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) +transpose((arpeggio(X) |shuffle(X) ) ,7) ) ,7) ) +(transpose(((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) +transpose(transpose(arpeggio(transpose((X+transpose(X,12) ) ,4) ) ,-5) ,12) ) ) |(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose(transpose(step(X,12) ,-7) ,4) ) +transpose(step(echo((X|X) ,4,6) ,12) ,7) ) +transpose(transpose((X|X) ,-7) ,7) ) ) ) +transpose((echo(step(transpose(X,4) ,12) ,4,6) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,4) ) +transpose(echo((((X|transpose(X,4) ) +transpose(X,7) ) |(X|step(X,12) ) ) ,4,6) ,7) ) ,4,6) ,7) ) ) ,12) |shuffle(transpose(step(((transpose(shuffle(X) ,-5) +transpose(((transpose(X,-7) +transpose(transpose(X,4) ,12) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ,7) ) +transpose(transpose(arpeggio(transpose(X,-7) ) ,-7) ,-5) ) ,12) ,-7) ) ) +transpose(transpose(arpeggio(step(transpose(transpose(((arpeggio((X|X) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) |transpose(transpose(X,4) ,-7) ) ,-7) ,4) ,12) ) ,4) ,4) ) ,12) ) random seed used was 64 NOTE: Generated phrase was too large ( 8000 ) , it has been truncated at 5000 notes. EXPR = step((((arpeggio(transpose(((transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) |arpeggio(transpose((X+transpose(X,12) ) ,-5) ) ) ,-7) ,-5) |(((transpose(X,-7) +(X|X) ) |(transpose(X,4) +transpose((X|X) ,12) ) ) |transpose((X|transpose(X,-5) ) ,4) ) ) |transpose((transpose(transpose(transpose(transpose(X,-7) ,-7) ,4) ,-5) +transpose((shuffle((transpose(transpose(transpose(X,4) ,-7) ,4) +transpose(echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ,7) ) ) +transpose(shuffle(echo(echo(arpeggio((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,4,6) ) ,12) ) ,7) ) ,-5) ) ,-7) ) |step(transpose(transpose(((transpose((X+transpose(X,12) ) ,4) +transpose(shuffle(arpeggio(arpeggio(transpose((transpose(shuffle(X) ,-5) +transpose(((X|(X|X) ) +transpose(transpose(X,4) ,12) ) ,7) ) ,-5) ) ) ) ,4) ) +transpose(shuffle((transpose(shuffle(transpose(shuffle(echo(X,4,6) ) ,-7) ) ,-5) |(arpeggio(step((arpeggio(X) +echo(X,4,6) ) ,12) ) |step(echo(transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ,4,6) ,12) ) ) ) ,7) ) ,-5) ,-7) ,12) ) +transpose(transpose(arpeggio(((echo(transpose((echo(((shuffle(X) +(X+transpose(X,12) ) ) +transpose((transpose(X,-7) |transpose(X,4) ) ,7) ) ,4,6) +transpose((transpose((shuffle(X) +transpose((X+X) ,7) ) ,4) |transpose(transpose(arpeggio(X) ,4) ,4) ) ,7) ) ,4) ,4,6) +transpose(step(echo(transpose(echo((transpose(X,-7) +X) ,4,6) ,4) ,4,6) ,12) ,4) ) +transpose(arpeggio((transpose(transpose(X,-5) ,4) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ) ,7) ) ) ,-7) ,12) ) +arpeggio(transpose(transpose((transpose((((transpose(((X+transpose(echo(X,4,6) ,12) ) +shuffle(X) ) ,-7) +transpose(transpose(X,4) ,12) ) |arpeggio(transpose(X,-7) ) ) |(transpose(((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4) +transpose(X,4) ) +transpose((X|X) ,7) ) ,-5) +transpose(shuffle(X) ,12) ) ) ,-7) +transpose(arpeggio((arpeggio((echo(transpose(step(X,12) ,4) ,4,6) +transpose(shuffle((((X+transpose((X|X) ,12) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,12) ) +transpose(transpose(echo((X|X) ,4,6) ,4) ,12) ) ) ,4) ) ) +transpose(echo(((X|(X+transpose(X,7) ) ) +transpose(step(transpose(shuffle(X) ,-5) ,12) ,7) ) ,4,6) ,7) ) ) ,7) ) ,-5) ,4) ) ) ,12) random seed used was 0 EXPR = transpose(((transpose(arpeggio(shuffle(transpose(arpeggio(shuffle(step(arpeggio(transpose(X,4) ) ,12) ) ) ,-7) ) ) ,-5) +transpose(((step((((transpose(step(transpose(step(X,12) ,-5) ,12) ,4) +transpose(shuffle((transpose(((transpose(X,-5) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(X) ,7) ) ,-5) |(transpose(X,-5) +step((X+transpose(X,12) ) ,12) ) ) ) ,12) ) |transpose(shuffle((arpeggio(X) |echo(X,4,6) ) ) ,-7) ) |((transpose(((X+transpose(X,7) ) |transpose((X+transpose(X,12) ) ,4) ) ,-5) +transpose(step(transpose(echo(shuffle((X|X) ) ,4,6) ,-7) ,12) ,4) ) +transpose(transpose((transpose(((transpose(X,-5) +transpose(step(X,12) ,12) ) |(transpose(X,-5) |transpose(X,-7) ) ) ,-5) +transpose(echo(transpose(transpose(X,-7) ,4) ,4,6) ,12) ) ,-7) ,7) ) ) ,12) +transpose((shuffle(step(transpose(transpose(transpose(X,4) ,-5) ,4) ,12) ) +shuffle((transpose(((step((((X+X) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,12) +transpose(transpose(((shuffle(transpose((X+transpose(X,7) ) ,-5) ) +transpose((transpose(X,4) |transpose((X|X) ,-5) ) ,4) ) +transpose(step(transpose(transpose(X,4) ,-7) ,12) ,7) ) ,-7) ,4) ) +transpose(shuffle(echo(transpose(transpose(X,-7) ,4) ,4,6) ) ,7) ) ,-7) |shuffle((arpeggio(X) |(((X|X) +(X+transpose(X,7) ) ) +transpose((shuffle(transpose(X,-5) ) +transpose(((X+transpose(X,12) ) |echo(X,4,6) ) ,7) ) ,7) ) ) ) ) ) ) ,4) ) +transpose((((transpose(transpose((transpose(((X+arpeggio(X) ) |(transpose(shuffle(X) ,-5) |arpeggio(transpose(X,4) ) ) ) ,-7) |((transpose(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4) +transpose(transpose(echo((X|echo(X,4,6) ) ,4,6) ,4) ,4) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) ,7) ) ) ,4) ,4) +transpose(shuffle((transpose(transpose(((transpose((X+transpose(X,7) ) ,-5) |transpose(X,4) ) +transpose(X,12) ) ,4) ,4) +transpose(transpose(step((X+transpose((X+(X|X) ) ,7) ) ,12) ,-7) ,7) ) ) ,7) ) |(arpeggio(((step(step((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,12) ,12) +transpose(transpose(transpose((transpose(X,-5) |transpose((X|X) ,4) ) ,-5) ,4) ,4) ) +transpose(((((X+transpose(X,7) ) +echo(X,4,6) ) +transpose((X|X) ,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) +transpose((transpose(transpose(X,-5) ,4) |((transpose(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4) +transpose(arpeggio(X) ,4) ) +transpose(transpose(transpose((X+X) ,-5) ,4) ,7) ) ) ,12) ) ) |transpose((transpose((((step((shuffle(transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) |transpose(arpeggio(arpeggio(transpose(X,4) ) ) ,-5) ) +transpose(transpose((transpose((X+(X|X) ) ,4) |transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,-7) ) ,-5) ,4) ) +transpose(((echo((X|X) ,4,6) +transpose(((transpose((X|(X|X) ) ,4) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose(((transpose(X,4) |X) |transpose(X,-5) ) ,7) ) ,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-7) |(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |arpeggio(X) ) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ) ,4) ) ,7) ) ,4) ) +transpose(transpose(((transpose((((step(transpose(transpose(X,4) ,-5) ,12) +transpose(((transpose(arpeggio(X) ,-7) +X) +transpose((X+(transpose((X|X) ,4) +transpose((X|X) ,12) ) ) ,7) ) ,7) ) +transpose(echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) ,4) ) +transpose(transpose(step(arpeggio(X) ,12) ,-7) ,7) ) ,-5) |transpose(transpose((transpose((echo((X+transpose(X,7) ) ,4,6) |((X+transpose(X,12) ) +transpose((((X|X) +transpose(X,4) ) +transpose((X+X) ,7) ) ,7) ) ) ,4) +transpose(transpose(transpose((transpose((X|X) ,4) |transpose((X|X) ,4) ) ,4) ,-7) ,12) ) ,4) ,-7) ) |echo(transpose((((transpose(arpeggio(transpose(X,-5) ) ,-5) +transpose(((arpeggio(step(((X+X) +X) ,12) ) +transpose((X|transpose(X,-7) ) ,4) ) +transpose((arpeggio(transpose(transpose(X,-5) ,-7) ) +transpose((((X+((transpose(X,-7) +transpose((X|X) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +transpose((((X|X) +transpose((X+transpose(arpeggio(X) ,12) ) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(((echo(X,4,6) +(transpose(transpose(transpose(X,4) ,4) ,4) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ,12) ) ) |((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,-5) ) |transpose(((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ) ) ,7) ) |(shuffle((((transpose(((X|X) +(X+X) ) ,4) +transpose(X,7) ) |(((X+transpose(X,7) ) +transpose(X,12) ) +transpose(transpose(arpeggio(X) ,4) ,12) ) ) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,7) ) ) +transpose((transpose(((X+transpose(echo(X,4,6) ,12) ) +transpose(transpose(X,-5) ,7) ) ,-5) +transpose(echo(transpose((X+echo(X,4,6) ) ,-5) ,4,6) ,7) ) ,7) ) ) ,-5) ,4,6) ) ,-5) ,7) ) ,-5) random seed used was 0 EXPR = transpose(transpose(((step((echo(arpeggio(shuffle(transpose(transpose(echo(X,4,6) ,-5) ,-5) ) ) ,4,6) +transpose((((transpose((step(step((((X+transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(arpeggio(shuffle(X) ) ,12) ) ,12) ,12) |step(transpose(X,-5) ,12) ) ,-7) +(shuffle(transpose(transpose(X,-7) ,4) ) +transpose(shuffle(transpose(transpose(X,4) ,-7) ) ,7) ) ) +transpose(step(step((transpose((X|X) ,4) +transpose(((echo(arpeggio((X|X) ) ,4,6) |transpose(X,4) ) +transpose(transpose(transpose((X|X) ,-7) ,4) ,7) ) ,7) ) ,12) ,12) ,4) ) +transpose(((arpeggio((X|arpeggio((X+transpose(X,7) ) ) ) ) |((transpose(transpose(X,4) ,-5) +transpose(transpose(X,-5) ,12) ) |(X+transpose(X,12) ) ) ) |arpeggio((transpose(transpose(step(echo(X,4,6) ,12) ,-5) ,-7) +transpose(echo(echo(transpose(shuffle(X) ,-5) ,4,6) ,4,6) ,7) ) ) ) ,7) ) ,12) ) ,12) +transpose((transpose((transpose(arpeggio((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(step(X,12) ,-7) ) ) ,4) +transpose(transpose((transpose(((X|X) +transpose(transpose(X,4) ,7) ) ,4) +transpose((transpose(X,4) |(X|transpose(X,-5) ) ) ,7) ) ,-7) ,7) ) ,-5) +transpose(((transpose(arpeggio(shuffle(transpose((transpose(step(transpose(X,-5) ,12) ,-5) |step(shuffle((X+X) ) ,12) ) ,-5) ) ) ,4) +transpose(((((transpose(((X+transpose(X,12) ) |X) ,4) +transpose(transpose(transpose(step(transpose(X,-7) ,12) ,4) ,-5) ,12) ) |transpose(transpose(X,4) ,-7) ) +transpose(arpeggio((((X|X) +transpose(step(X,12) ,7) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose(((X+transpose(X,7) ) |X) ,7) ) ,12) ) ) ,12) ) +transpose(step(transpose(transpose((transpose(step(shuffle(X) ,12) ,-5) +transpose(step(transpose(X,4) ,12) ,12) ) ,4) ,4) ,12) ,7) ) ,4) ) +transpose(((transpose(transpose((transpose(X,4) +transpose(transpose((X+transpose((X|X) ,7) ) ,-7) ,12) ) ,4) ,4) +transpose(transpose(transpose(echo(transpose(arpeggio(transpose(X,-5) ) ,4) ,4,6) ,-5) ,4) ,-5) ) +transpose(transpose(transpose((transpose(echo(X,4,6) ,4) |echo((X+transpose(X,12) ) ,4,6) ) ,-7) ,4) ,12) ) ,7) ) ,12) ) ,12) ) +echo((step(echo(transpose(X,-5) ,4,6) ,12) +transpose((transpose((transpose(shuffle(step(X,12) ) ,-7) +transpose((transpose((transpose(transpose(X,-5) ,-5) |(echo(X,4,6) |(X+transpose(X,12) ) ) ) ,-7) +echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) ) ,7) ) ,-7) +transpose(echo(echo((shuffle((transpose(echo(X,4,6) ,4) |shuffle(echo(X,4,6) ) ) ) |(transpose((step(transpose((X+transpose(X,7) ) ,-7) ,12) +echo(X,4,6) ) ,-5) +transpose(transpose(arpeggio((X|X) ) ,-5) ,12) ) ) ,4,6) ,4,6) ,7) ) ,12) ) ,4,6) ) ,-7) ,-7) random seed used was 0 NOTE: Generated phrase was too large ( 10544 ) , it has been truncated at 5000 notes.

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