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: echo(transpose(((arpeggio((((((echo((transpose(((transpose(transpose(step(X,12) ,-7) ,4) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,12) ) +transpose((arpeggio(((step(X,12) +transpose(X,12) ) +step(X,12) ) ) +((transpose(transpose(X,4) ,-5) |echo(X,4,6) ) +transpose(X,12) ) ) ,12) ) ,4) +transpose((transpose(transpose(((transpose(X,4) |(X|X) ) +transpose((X+transpose(transpose(X,-5) ,7) ) ,7) ) ,-5) ,-5) +((X+arpeggio(X) ) +transpose(transpose(X,-5) ,12) ) ) ,7) ) ,4,6) +transpose((transpose(transpose((transpose(transpose((X+transpose(X,7) ) ,-7) ,4) +transpose(transpose(((X+X) |(X+transpose(X,7) ) ) ,4) ,12) ) ,-5) ,-5) +(((arpeggio(((((X+transpose(X,4) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |(transpose(X,4) +(X+X) ) ) ) +transpose(echo((transpose(transpose(transpose(X,-5) ,4) ,-7) |echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) ) ,4,6) ,12) ) +(step(((X|X) |transpose(X,-7) ) ,12) +transpose((transpose(X,-7) +transpose(X,7) ) ,4) ) ) +transpose(shuffle(shuffle(((X+transpose((X+(X+transpose((X+transpose(X,12) ) ,12) ) ) ,4) ) +transpose((transpose(transpose(X,4) ,-5) +transpose((transpose(X,4) +X) ,12) ) ,7) ) ) ) ,12) ) ) ,-5) ) |arpeggio(arpeggio(transpose(transpose(((transpose(echo(transpose(X,-7) ,4,6) ,-5) +transpose(((transpose(X,4) +X) |X) ,12) ) +transpose((X+X) ,12) ) ,-5) ,4) ) ) ) +transpose(transpose(echo(arpeggio(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) ) ,4,6) ,-7) ,4) ) +transpose((transpose((transpose(transpose(shuffle(transpose((X+transpose(X,12) ) ,4) ) ,4) ,-5) |transpose(transpose(step(X,12) ,-7) ,-5) ) ,-5) +transpose((((transpose(((transpose((shuffle(X) |(X+X) ) ,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((echo(step((X+transpose(X,12) ) ,12) ,4,6) +transpose(transpose((X+transpose(step(X,12) ,7) ) ,-7) ,7) ) |(transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose(step(X,12) ,7) ) ) ,12) ) ,4) +transpose(transpose((arpeggio((echo(transpose(echo((X|X) ,4,6) ,-7) ,4,6) +transpose(transpose(X,-7) ,7) ) ) |(transpose((transpose(X,-7) |transpose(X,-5) ) ,4) +transpose(((arpeggio((X|X) ) +transpose((X+transpose(X,12) ) ,12) ) +(shuffle(shuffle(X) ) |shuffle(arpeggio(X) ) ) ) ,12) ) ) ,4) ,12) ) +transpose((transpose(transpose(((((transpose(X,-7) +(X|X) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) |transpose((X+transpose((X+X) ,-7) ) ,-5) ) |echo(((echo(X,4,6) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,4,6) ) ,4) ,-5) +transpose((transpose(shuffle(arpeggio(step((X+X) ,12) ) ) ,4) |transpose(transpose(((transpose(transpose(X,-5) ,-7) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) +transpose(X,7) ) ,4) ,-5) ) ,7) ) ,4) ) +transpose(transpose(step(echo(shuffle((((X+transpose((X|X) ,4) ) +transpose(X,7) ) |(X+transpose(echo(X,4,6) ,7) ) ) ) ,4,6) ,12) ,4) ,7) ) ,12) ) ,7) ) |((((((transpose((step((shuffle((X+transpose(X,7) ) ) +transpose(((X+(X|X) ) +transpose((X+transpose(X,12) ) ,-5) ) ,7) ) ,12) |((((transpose(transpose(X,-7) ,4) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(((X+X) +transpose(X,12) ) ,7) ) |echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) ) |(X+transpose(X,7) ) ) ) ,-7) +transpose(transpose(transpose((((((X+transpose((X+X) ,4) ) +transpose(X,7) ) +transpose(((X|step(transpose(X,4) ,12) ) |transpose(shuffle(X) ,4) ) ,4) ) +transpose((echo(X,4,6) |(X+transpose(X,7) ) ) ,7) ) |(transpose((arpeggio(X) |X) ,-5) +transpose(((((X|X) +X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((shuffle(X) |X) ,7) ) ,12) ) ) ,-7) ,-5) ,4) ) +transpose(((((((transpose(X,4) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) |(transpose(X,4) +transpose(X,12) ) ) +transpose(transpose(arpeggio(X) ,4) ,12) ) |transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,-5) ) +transpose((step(arpeggio(transpose((((X|X) +transpose((X+transpose(X,12) ) ,7) ) +transpose(((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,4) ) ,12) +transpose(((((transpose(X,4) |transpose(X,-5) ) |shuffle((X+transpose(X,12) ) ) ) +transpose((X|(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ) ,4) ) +transpose((((echo(X,4,6) +transpose(X,4) ) |echo(arpeggio(X) ,4,6) ) +transpose(transpose(X,-5) ,-7) ) ,7) ) ,4) ) ,12) ) ,7) ) +transpose(arpeggio((((transpose((((X+X) +transpose(transpose(transpose((X+X) ,-5) ,-5) ,4) ) +transpose((X+((X+transpose(X,12) ) |X) ) ,7) ) ,-7) +transpose(transpose((((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) |transpose(X,-7) ) +arpeggio((((X+X) |echo(X,4,6) ) |transpose(X,4) ) ) ) ,-5) ,12) ) +(transpose((((((transpose(X,-5) +transpose(echo(X,4,6) ,7) ) +transpose(echo((X+X) ,4,6) ,7) ) +transpose(echo(X,4,6) ,12) ) +transpose((arpeggio(X) +transpose(shuffle((transpose(X,-7) +transpose(X,12) ) ) ,7) ) ,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |transpose(transpose(X,-7) ,-5) ) ,7) ) ,-5) +transpose((((transpose((arpeggio(X) +transpose(transpose(X,-7) ,12) ) ,-7) +transpose(step(X,12) ,4) ) +transpose(transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) ,7) ) |transpose((X|X) ,-7) ) ,7) ) ) +transpose(transpose(((arpeggio(transpose(transpose(X,-7) ,-7) ) +transpose(transpose(X,4) ,-7) ) +(((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) +(X+transpose((((X+transpose(X,7) ) |(X+transpose(X,7) ) ) +transpose((transpose(X,4) +transpose(X,4) ) ,7) ) ,12) ) ) ) ,4) ,12) ) ) ,4) ) +transpose(arpeggio(transpose(step((shuffle(transpose(transpose(transpose(X,4) ,4) ,-7) ) +transpose(transpose(step(X,12) ,-5) ,12) ) ,12) ,-7) ) ,7) ) +transpose(((transpose(transpose(X,4) ,4) |transpose((X|(((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) |transpose((X|X) ,4) ) ) ,-7) ) +transpose(transpose(((transpose((transpose(echo(X,4,6) ,-5) +transpose(step(X,12) ,7) ) ,-5) +transpose((((X+X) +transpose(echo(X,4,6) ,7) ) +echo(step(X,12) ,4,6) ) ,4) ) +transpose(((transpose(step(X,12) ,4) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) +transpose((((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(((X+X) +(X|X) ) ,4) ,7) ) ,7) ) ,7) ) ,-5) ,7) ) ,4) ) +transpose(((((((transpose((((((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +transpose(echo(shuffle(X) ,4,6) ,12) ) |X) |shuffle(X) ) ,-5) +transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,12) ,4) ) +transpose(transpose((echo((((X|X) +transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) |X) ,-7) ,7) ) +arpeggio(((transpose(X,-5) +transpose(((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ,12) ) |(step(X,12) +transpose(X,4) ) ) ) ) +transpose(echo(((((transpose(X,-5) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose(X,4) ) +((X|X) +(echo((X|X) ,4,6) |(X+X) ) ) ) |transpose(step(((X|X) |X) ,12) ,-5) ) ,4,6) ,7) ) +((transpose(((step(X,12) +transpose((X+X) ,12) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ,4) +echo(shuffle(transpose(transpose(X,4) ,4) ) ,4,6) ) +transpose(transpose((transpose(transpose((X|X) ,4) ,-7) |((X+(X+transpose(X,12) ) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ) ,-5) ,4) ) ) +transpose(echo(arpeggio(transpose(transpose(arpeggio((transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,4) +arpeggio(X) ) ) ,4) ,4) ) ,4,6) ,7) ) ,7) ) ) ) +transpose(transpose(((echo(((step(arpeggio((((X+X) |transpose(X,4) ) +transpose(X,7) ) ) ,12) +transpose((transpose(echo((X+transpose(transpose(transpose(X,-7) ,-7) ,12) ) ,4,6) ,-5) +transpose(transpose(((X+transpose(transpose(X,-5) ,12) ) +transpose(X,7) ) ,-7) ,12) ) ,4) ) +transpose((step(arpeggio(X) ,12) +transpose(X,-5) ) ,7) ) ,4,6) +((step(transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,-7) ,12) +transpose((transpose(step(arpeggio(X) ,12) ,-7) +transpose(transpose(arpeggio(transpose(X,-7) ) ,-5) ,12) ) ,4) ) +((transpose(((X+X) +transpose(transpose(transpose(((X|X) +transpose(X,7) ) ,-7) ,-5) ,12) ) ,-5) +transpose(transpose((transpose(X,4) +transpose(transpose((X|X) ,-7) ,12) ) ,-7) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ) ) +transpose((((((step(step(arpeggio(X) ,12) ,12) |step(((echo(transpose(X,-7) ,4,6) +transpose((((step(X,12) |X) +transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,7) ) ,12) ) +transpose(transpose(transpose(transpose(X,-5) ,4) ,-5) ,7) ) |((transpose((((((X+echo(X,4,6) ) +transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(((shuffle((X+X) ) +transpose(((echo(X,4,6) +transpose((X|X) ,4) ) +transpose(X,7) ) ,4) ) +transpose((X|step(X,12) ) ,7) ) ,7) ) |(arpeggio((X+X) ) +transpose((X+arpeggio(X) ) ,7) ) ) ,-7) +transpose(step(((echo(X,4,6) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ,12) ) +transpose((((((echo((X|X) ,4,6) +(arpeggio(X) |((X+X) +transpose(X,7) ) ) ) +arpeggio((transpose(X,4) +X) ) ) +arpeggio(transpose(X,-7) ) ) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(transpose((arpeggio((X|(X+transpose(X,12) ) ) ) +X) ,-5) ,7) ) ,7) ) ) +transpose((X|X) ,7) ) +transpose((arpeggio(transpose((X+transpose(X,12) ) ,-5) ) +transpose((transpose(X,-7) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+X) ,7) ) ) ,4) ) ,-5) ) ,12) ) ,-5) ,7) ) +(((transpose(transpose(transpose((transpose((((((X+X) +transpose((((X+transpose(X,7) ) +X) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose((((X|X) +transpose(transpose(X,4) ,12) ) +transpose(step(X,12) ,7) ) ,7) ) +transpose(((echo((step((X+X) ,12) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) +transpose(X,4) ) +transpose(((X+X) +transpose(X,-5) ) ,7) ) ,12) ) +transpose((((step(transpose(X,4) ,12) +transpose((transpose(transpose(X,-7) ,4) +X) ,4) ) +transpose((((X+transpose(X,12) ) +X) |arpeggio((X+transpose(X,7) ) ) ) ,7) ) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) ,7) ) ,4) +arpeggio(shuffle((echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ) ) ) ,-7) ,4) ,-7) +transpose(transpose(transpose((transpose(echo((transpose(X,4) +X) ,4,6) ,-5) |echo((((arpeggio((shuffle(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) |((X|X) |(X+transpose(X,12) ) ) ) ) +transpose(shuffle(arpeggio(transpose(echo(X,4,6) ,4) ) ) ,4) ) +transpose((transpose((X|X) ,-7) |(echo(transpose(X,-5) ,4,6) +transpose(echo(X,4,6) ,7) ) ) ,7) ) |(transpose(((X+X) +echo((X|X) ,4,6) ) ,-5) +echo(X,4,6) ) ) ,4,6) ) ,-7) ,-7) ,4) ) +transpose(((step(transpose((transpose((transpose((transpose(X,-5) +X) ,-7) |arpeggio(transpose(transpose(X,4) ,-5) ) ) ,-7) |transpose((transpose(transpose(step(transpose(((X+transpose(X,12) ) |X) ,-7) ,12) ,-5) ,-7) +(step((step((X+transpose(X,12) ) ,12) |echo(X,4,6) ) ,12) +((transpose(X,-5) |(X+transpose(X,7) ) ) +transpose(X,12) ) ) ) ,-5) ) ,-5) ,12) +transpose(transpose(transpose((transpose(transpose((step(shuffle(transpose(X,-5) ) ,12) +transpose((X|(X+X) ) ,4) ) ,-5) ,4) +(echo(shuffle((transpose((X|X) ,-7) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) ) ,4,6) |arpeggio((X|X) ) ) ) ,-5) ,-5) ,-7) ) +transpose(((transpose(transpose((transpose(step((X|X) ,12) ,4) |echo((((X+transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) |transpose(X,-7) ) ,4,6) ) ,-7) ,-7) +(transpose(((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,4) |transpose(step(transpose((X|X) ,4) ,12) ,4) ) +(transpose(((X+transpose(arpeggio(X) ,12) ) |((X+transpose(X,12) ) +transpose((X+X) ,12) ) ) ,4) +echo((X|X) ,4,6) ) ) ,-7) +transpose(transpose(transpose(transpose(arpeggio(((X+X) |X) ) ,-7) ,-7) ,-7) ,7) ) ) |((arpeggio((transpose(transpose((transpose(X,4) +transpose((X|X) ,12) ) ,-5) ,-5) +transpose((transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) ,4) |transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ) ,7) ) ) |(transpose(arpeggio((transpose((X+transpose(X,12) ) ,-7) |(((X+transpose(X,7) ) +(X+transpose(X,12) ) ) +(X+transpose(step(X,12) ,7) ) ) ) ) ,4) |((((transpose(X,-7) +transpose((transpose(transpose(X,-5) ,4) +transpose(X,7) ) ,4) ) +transpose((echo(step(X,12) ,4,6) |(X+transpose(X,7) ) ) ,7) ) |(echo(X,4,6) |arpeggio((echo(X,4,6) +transpose(shuffle(X) ,12) ) ) ) ) |transpose(transpose(transpose(X,-5) ,4) ,-5) ) ) ) |((((shuffle(shuffle(arpeggio((X+X) ) ) ) +transpose(transpose(transpose(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ,-5) ,4) ,-7) ) +transpose(transpose(((((X+X) +transpose(transpose(step(X,12) ,-7) ,12) ) +transpose(shuffle(shuffle(X) ) ,4) ) +transpose(((X+transpose(X,12) ) |(X|X) ) ,7) ) ,-7) ,4) ) +transpose(step((arpeggio(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ) +(transpose(arpeggio((X|X) ) ,4) +transpose((transpose(transpose(X,-5) ,4) +transpose((X|X) ,7) ) ,-7) ) ) ,12) ,7) ) +(((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |echo((X+transpose(X,12) ) ,4,6) ) ) |transpose(transpose(transpose(transpose(X,4) ,4) ,-7) ,-5) ) +transpose((((arpeggio((X+transpose(transpose(echo(X,4,6) ,-7) ,12) ) ) +transpose(transpose(step(transpose(X,-7) ,12) ,-7) ,4) ) +transpose(step((((step(X,12) +X) +transpose(transpose(X,-7) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +step(X,12) ) ,7) ) ,12) ,7) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(echo(arpeggio(transpose(transpose(X,-5) ,-7) ) ,4,6) ,-5) ) ) ) ) ,7) ) ,7) ) +transpose((transpose(((transpose((((X+transpose(X,7) ) |X) +(transpose(X,-7) +transpose(X,12) ) ) ,-7) +transpose(arpeggio(echo(X,4,6) ) ,7) ) +transpose(transpose((transpose(arpeggio((((X+transpose(X,12) ) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose(X,7) ) ) ,-7) |(((transpose((X|X) ,4) +transpose((transpose(transpose((X+X) ,4) ,-7) +transpose(((X+transpose(X,7) ) +transpose(transpose((X+X) ,-7) ,12) ) ,12) ) ,4) ) +transpose(shuffle(transpose((X+X) ,-5) ) ,7) ) |(transpose(arpeggio(transpose(X,-7) ) ,4) |(arpeggio(shuffle(X) ) +transpose((X|(X+transpose(X,7) ) ) ,7) ) ) ) ) ,4) ,7) ) ,-7) +transpose(transpose(((((transpose((transpose(X,-7) |(X+transpose(X,12) ) ) ,4) +transpose((arpeggio(X) +transpose(transpose(X,-7) ,12) ) ,7) ) +echo((arpeggio(X) +transpose(echo(X,4,6) ,12) ) ,4,6) ) +shuffle(transpose(((transpose(X,4) |(step(X,12) +transpose(transpose(X,-5) ,7) ) ) +transpose(arpeggio(X) ,-5) ) ,-7) ) ) +transpose((step(transpose((X|X) ,4) ,12) +transpose(shuffle(transpose(((X|X) +shuffle(X) ) ,-7) ) ,12) ) ,12) ) ,-7) ,12) ) ,4) ) ) ,-5) ,4,6) random seed used was 62942926

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