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 18 generations the expression "X" became this: transpose(transpose(arpeggio(shuffle(shuffle(arpeggio((transpose(((arpeggio((transpose(X,4) +shuffle((X+transpose(X,7) ) ) ) ) +transpose(X,4) ) +transpose(((X+X) +transpose(X,12) ) ,7) ) ,-7) |((((transpose((X+X) ,-7) +transpose(X,-5) ) +(((X+transpose(transpose(X,-5) ,12) ) +transpose(((X|X) |arpeggio((X+X) ) ) ,7) ) +transpose(((((transpose(X,-7) +transpose((transpose(X,-7) +transpose(X,4) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose(((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose((X|X) ,7) ) ,12) ) ) +transpose(((((X|X) +transpose((X+transpose(X,12) ) ,7) ) |X) +transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose((shuffle(X) +transpose(shuffle(X) ,12) ) ,4) ) +transpose(arpeggio((X+X) ) ,7) ) ,7) ) ,4) ) +transpose((shuffle((step((X+transpose(X,12) ) ,12) +transpose((echo(X,4,6) |X) ,12) ) ) +transpose(step(transpose(X,4) ,12) ,12) ) ,7) ) ) ) ) ) ) ,-5) ,-5) random seed used was 64 EXPR = (transpose((shuffle(((step(transpose(shuffle((step(((X+transpose(echo(X,4,6) ,12) ) +transpose((echo(X,4,6) +shuffle(X) ) ,7) ) ,12) +transpose(shuffle(((X+X) |transpose(X,-5) ) ) ,12) ) ) ,-7) ,12) +transpose(transpose(transpose((transpose(X,4) +arpeggio(transpose(X,4) ) ) ,-5) ,-7) ,4) ) +transpose(((echo(shuffle(transpose((((X|X) +transpose(X,4) ) +transpose(shuffle((X|(X|X) ) ) ,7) ) ,-5) ) ,4,6) +transpose((step(transpose(transpose(echo(X,4,6) ,4) ,-7) ,12) +transpose(((shuffle(X) |((transpose((X+X) ,-7) +((transpose(X,-7) +transpose((X|X) ,4) ) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,7) ) ) +(transpose(X,-7) +transpose(X,7) ) ) ) +(((transpose(X,-7) |(transpose(X,-5) +X) ) +transpose(((shuffle(X) |transpose(X,-7) ) |(X+transpose(X,12) ) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ,12) ) +transpose((((((transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,-7) +transpose(((((X|X) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +shuffle(X) ) ,7) ) +echo(shuffle(step(transpose(transpose(X,-5) ,4) ,12) ) ,4,6) ) +step(((shuffle(transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ) |step(transpose((X+transpose(X,7) ) ,4) ,12) ) |transpose(shuffle(step(X,12) ) ,-7) ) ,12) ) +transpose(transpose((arpeggio(echo(arpeggio(step(X,12) ) ,4,6) ) |transpose((shuffle((X+X) ) +transpose(arpeggio(X) ,7) ) ,-7) ) ,-7) ,7) ) +transpose(transpose(transpose(arpeggio(transpose((echo(X,4,6) |X) ,-5) ) ,-7) ,4) ,12) ) ,7) ) ,7) ) ) +transpose(arpeggio(arpeggio(((transpose(((((((transpose((X+transpose(X,7) ) ,-5) |((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ) +transpose(((transpose(step(X,12) ,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,-7) ,7) ) +transpose(transpose(shuffle(X) ,-7) ,-5) ) |transpose(step(transpose(((X|X) +transpose(shuffle(X) ,12) ) ,-5) ,12) ,-7) ) |step(transpose(transpose(transpose(shuffle(X) ,-5) ,-5) ,-5) ,12) ) ,-7) +transpose(shuffle(transpose(arpeggio(transpose((((X+transpose((X+X) ,12) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) +transpose(transpose(arpeggio(X) ,4) ,12) ) ,-7) ) ,-7) ) ,4) ) +transpose(transpose(transpose(arpeggio(((((X|X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ) ,-5) ,-5) ,7) ) ) ) ,12) ) ,-5) +(shuffle(transpose((((step(((transpose(transpose((shuffle(X) |((echo(X,4,6) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ) ,-5) ,4) +transpose(shuffle((transpose(X,-7) +transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ) ,12) ) |transpose(transpose(echo((echo(X,4,6) +transpose(X,7) ) ,4,6) ,4) ,-7) ) ,12) +transpose(((shuffle(transpose((((transpose(X,4) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) +((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ) ,-7) ) +transpose(transpose(shuffle(transpose(step(X,12) ,4) ) ,-5) ,4) ) +transpose((transpose(echo((step(transpose(X,-5) ,12) |transpose((X+transpose((X|X) ,7) ) ,4) ) ,4,6) ,4) +transpose(shuffle(shuffle(shuffle(transpose(X,-5) ) ) ) ,-7) ) ,7) ) ,4) ) +transpose((shuffle((shuffle(X) |echo(X,4,6) ) ) +transpose(((transpose(((transpose(transpose(X,-7) ,4) +transpose(step(transpose(X,4) ,12) ,7) ) |shuffle(step(X,12) ) ) ,4) +(transpose(transpose(X,-7) ,-5) +transpose((transpose(X,-7) +transpose(X,12) ) ,12) ) ) +transpose(shuffle(step((transpose(X,-5) +transpose(echo((X+shuffle(X) ) ,4,6) ,7) ) ,12) ) ,7) ) ,7) ) ,7) ) +step(echo(shuffle(transpose(((shuffle((transpose(X,-7) +((X+transpose((X|X) ,7) ) +((X+transpose(X,7) ) |X) ) ) ) +transpose((((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ,12) ) +((shuffle(transpose((X+transpose(X,7) ) ,4) ) +(transpose(X,4) |(X|X) ) ) |transpose((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(shuffle(X) ,7) ) ,-7) ) ) ,-7) ) ,4,6) ,12) ) ,-7) ) +transpose(arpeggio(shuffle(echo(transpose(transpose(arpeggio(transpose((transpose(step(X,12) ,-5) |(transpose(X,4) |(X|X) ) ) ,-7) ) ,-5) ,-7) ,4,6) ) ) ,7) ) ) random seed used was 0 EXPR = ((((((((((transpose(((step(transpose(step(transpose(step(X,12) ,-5) ,12) ,-5) ,12) +((shuffle((X+shuffle(X) ) ) +transpose(((transpose((step(X,12) +transpose((X+transpose(echo(X,4,6) ,7) ) ,12) ) ,-7) +transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(step((X+transpose((step(X,12) |transpose(X,-5) ) ,12) ) ,12) ,7) ) ) +transpose(step(transpose(((transpose(transpose(X,4) ,-7) +transpose(((X+X) +transpose(step(X,12) ,7) ) ,12) ) +(((arpeggio(X) +transpose((echo(X,4,6) |transpose(X,4) ) ,4) ) +transpose(X,7) ) +X) ) ,4) ,12) ,7) ) ,4) +transpose(shuffle(echo(shuffle(((X+transpose(X,12) ) +transpose(X,7) ) ) ,4,6) ) ,4) ) +transpose(transpose(transpose(echo((transpose((X+transpose(X,7) ) ,-7) |X) ,4,6) ,4) ,-5) ,7) ) +transpose((((shuffle(((echo(X,4,6) +transpose(X,-5) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) ) ) +transpose(transpose(echo(shuffle((X|(X|X) ) ) ,4,6) ,4) ,4) ) +transpose(((step(transpose(arpeggio(X) ,-5) ,12) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose((shuffle(transpose(X,-5) ) +transpose((transpose(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,-5) |(step((shuffle(X) +transpose(X,-7) ) ,12) |(shuffle(X) +X) ) ) ,12) ) ,7) ) ,7) ) +transpose(arpeggio(shuffle((((((transpose(X,-7) +step(X,12) ) +((X|X) +transpose(X,7) ) ) |transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,-5) ) +transpose(step((X|X) ,12) ,4) ) +transpose(shuffle(transpose((X+transpose(X,12) ) ,-7) ) ,7) ) ) ) ,7) ) ,4) ) +transpose(shuffle(transpose((((((transpose((X|X) ,4) +((echo(X,4,6) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ) |(shuffle(X) +shuffle(X) ) ) +(((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose((step(X,12) +shuffle(X) ) ,7) ) ) +transpose(((arpeggio(transpose((X+X) ,-5) ) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose(shuffle(echo((X+transpose(X,7) ) ,4,6) ) ,7) ) ,4) ) +transpose(shuffle(transpose(step(X,12) ,-5) ) ,7) ) ,4) ) ,7) ) +transpose(transpose(shuffle(((X+transpose(X,12) ) +X) ) ,-5) ,4) ) +transpose(transpose((transpose(((arpeggio(shuffle(transpose(X,-7) ) ) +transpose(step(transpose(transpose(X,-5) ,4) ,12) ,12) ) +transpose(shuffle((X+(X|X) ) ) ,12) ) ,-7) +transpose(shuffle(transpose((transpose(transpose(X,-7) ,-7) +transpose(transpose(((shuffle((X|X) ) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-5) ,12) ) ,4) ) ,7) ) ,-7) ,7) ) |shuffle((((((step(X,12) +(transpose((transpose(shuffle(X) ,4) |(X+X) ) ,-5) +transpose((echo((step(X,12) +transpose(X,7) ) ,4,6) +transpose(echo(shuffle(X) ,4,6) ,4) ) ,7) ) ) |arpeggio((arpeggio((X+transpose(X,4) ) ) +transpose((shuffle(X) |transpose(X,4) ) ,-7) ) ) ) +transpose((((step(transpose(transpose(transpose(shuffle(X) ,-5) ,4) ,-5) ,12) +transpose(arpeggio((step(X,12) |transpose(X,4) ) ) ,12) ) +transpose(echo((transpose((step(X,12) +transpose((X+X) ,7) ) ,4) |transpose(transpose(transpose(X,-7) ,4) ,-5) ) ,4,6) ,4) ) +transpose(shuffle(((echo((X+transpose(X,4) ) ,4,6) +transpose(shuffle((X+X) ) ,12) ) |((((X+X) +transpose(X,7) ) +transpose((transpose(X,-7) +X) ,12) ) +transpose(echo(transpose(shuffle(X) ,4) ,4,6) ,7) ) ) ) ,7) ) ,12) ) +transpose(shuffle(transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,4) ,4) ) ,4) ) +transpose(((transpose(transpose(X,-7) ,4) |(shuffle(transpose(X,4) ) +shuffle(((X+shuffle(X) ) |transpose(X,-7) ) ) ) ) +transpose(shuffle(transpose(X,-5) ) ,-5) ) ,7) ) ) ) +transpose(echo((((shuffle(shuffle(((step(step((X+transpose(X,12) ) ,12) ,12) +step(X,12) ) +((transpose(X,-7) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose((step(X,12) +transpose(X,7) ) ,7) ) ) ) ) +transpose(transpose(shuffle(transpose(transpose(echo(echo(X,4,6) ,4,6) ,-5) ,4) ) ,-5) ,-7) ) +transpose((transpose(arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,-7) +transpose((step((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) ,4) +((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,12) ) ) +(transpose((transpose(arpeggio(X) ,-7) |transpose(transpose(X,4) ,-5) ) ,4) +transpose(echo(shuffle(X) ,4,6) ,12) ) ) ) ,12) |(arpeggio(transpose(shuffle(transpose((X+X) ,4) ) ,-7) ) +transpose(transpose((transpose(transpose(X,4) ,4) +transpose(echo(X,4,6) ,7) ) ,-7) ,12) ) ) ,7) ) ,7) ) +echo(shuffle(((((((shuffle(shuffle(X) ) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) +transpose((shuffle(shuffle(X) ) +transpose((shuffle((X+arpeggio(X) ) ) +transpose(arpeggio((X+transpose(transpose(X,-5) ,7) ) ) ,12) ) ,7) ) ,12) ) +transpose(transpose(transpose(arpeggio((X|X) ) ,4) ,-5) ,4) ) +transpose(shuffle(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) ,7) ) |((transpose(shuffle(arpeggio(X) ) ,-5) |(shuffle(transpose(X,-7) ) +transpose(transpose(X,-7) ,-5) ) ) +transpose((step((X+transpose(X,-5) ) ,12) +echo(arpeggio(X) ,4,6) ) ,7) ) ) ) ,4,6) ) ,4,6) ,4) ) +transpose(echo(echo((((((X|transpose(X,4) ) |transpose(X,4) ) +((shuffle(transpose((X+X) ,-5) ) |transpose(transpose((step(X,12) +(transpose(X,4) +X) ) ,-7) ,4) ) +transpose(((shuffle(X) +transpose(shuffle(((X+transpose((X+transpose(X,12) ) ,12) ) |(X+X) ) ) ,4) ) +transpose(transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,7) ) ,7) ) ) +transpose(shuffle(((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) ) +transpose(transpose(step((transpose(X,-5) +shuffle(X) ) ,12) ,4) ,7) ) ,4,6) ,4,6) ,7) ) +transpose((transpose(transpose(shuffle(((transpose(arpeggio((step(shuffle(transpose(X,-7) ) ,12) +((shuffle(X) +(X|transpose(X,-7) ) ) |(X+transpose(transpose(X,4) ,12) ) ) ) ) ,-7) +transpose(transpose(transpose(shuffle(echo(((X+X) |step(transpose(X,4) ,12) ) ,4,6) ) ,-5) ,4) ,4) ) +transpose((((step(transpose(X,-5) ,12) +transpose(((transpose(echo(X,4,6) ,4) +transpose(shuffle(X) ,12) ) |(step((X+shuffle(X) ) ,12) +transpose(echo(shuffle(shuffle(X) ) ,4,6) ,7) ) ) ,12) ) +transpose(transpose(transpose(((transpose(X,-7) +transpose((transpose(X,-7) |step(X,12) ) ,4) ) +transpose((X+X) ,7) ) ,-5) ,4) ,4) ) +transpose(shuffle(step(transpose((step(X,12) +X) ,-5) ,12) ) ,7) ) ,7) ) ) ,-5) ,4) +transpose(echo(transpose(transpose(echo(transpose((transpose(((((X|X) +transpose((X+transpose(X,7) ) ,12) ) +transpose(transpose(X,-5) ,7) ) +((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,-5) +transpose(transpose(echo(shuffle(transpose((X+transpose(X,12) ) ,-5) ) ,4,6) ,4) ,12) ) ,4) ,4,6) ,-7) ,-5) ,4,6) ,12) ) ,7) ) random seed used was 0 EXPR = step(shuffle(((((transpose(transpose((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) ) +transpose(arpeggio(X) ,7) ) ,4) ,-7) +transpose(transpose(arpeggio(((step((X+X) ,12) +transpose(shuffle((X+transpose(transpose(X,-5) ,7) ) ) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) ) ,-5) ,4) ) +transpose(shuffle(transpose(arpeggio(shuffle(X) ) ,-5) ) ,7) ) +(transpose((arpeggio((shuffle((X+X) ) +X) ) |X) ,-7) |(((echo((X+X) ,4,6) |shuffle(((X|X) |(X+X) ) ) ) +transpose(transpose((transpose(transpose((X|X) ,4) ,4) +step(transpose(X,4) ,12) ) ,-7) ,7) ) +((shuffle(transpose(X,4) ) |((transpose(X,-5) +transpose((X+transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(((step(X,12) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ) +((((step(X,12) +transpose(echo(X,4,6) ,7) ) +transpose((X+transpose(X,12) ) ,-7) ) +shuffle(X) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,12) ) ) ) ) ) +(((((transpose((((X+X) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) ,-7) +transpose(X,12) ) +(echo(X,4,6) |arpeggio(arpeggio(X) ) ) ) +transpose(transpose(((X+transpose(X,12) ) +transpose((X|X) ,12) ) ,-5) ,-7) ) +transpose(transpose((echo(arpeggio((((X+X) +arpeggio(X) ) +X) ) ,4,6) +transpose((transpose(shuffle((X+X) ) ,4) +transpose((transpose(transpose(((X|X) |(X+transpose(X,12) ) ) ,4) ,-7) |transpose(shuffle(echo(X,4,6) ) ,-5) ) ,7) ) ,7) ) ,4) ,4) ) +transpose((echo(((X|X) |(X+X) ) ,4,6) +transpose((((transpose(((transpose((X+X) ,-7) +(((echo(X,4,6) +arpeggio(X) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) +(shuffle(shuffle(X) ) |transpose(step(X,12) ,-7) ) ) ,-7) +transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose(shuffle((((transpose(X,-7) +((X+transpose(X,12) ) |transpose(X,-5) ) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) +transpose(shuffle((((X|X) +transpose(echo(X,4,6) ,12) ) |step(X,12) ) ) ,12) ) ,12) ) ,7) ) ) ) ,12) random seed used was 0

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