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: (((((((arpeggio(echo(transpose((shuffle(echo(transpose(((transpose(X,-7) |X) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ,4) ,4,6) ) +transpose(echo((((X+transpose((((X+transpose(X,7) ) +X) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(shuffle(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) +transpose(transpose((((echo(X,4,6) +transpose((transpose(X,-5) +echo(X,4,6) ) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose((echo((X|X) ,4,6) |arpeggio(X) ) ,12) ) ,4) ,12) ) ,4,6) ,12) ) ,-7) ,4,6) ) +transpose(echo(transpose(((transpose(shuffle(transpose(arpeggio(transpose(step(X,12) ,-5) ) ,4) ) ,-7) |((step(((arpeggio(X) |(X+transpose(transpose(X,-7) ,7) ) ) +transpose(X,-5) ) ,12) +transpose(arpeggio(((X+X) |X) ) ,12) ) |(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |transpose(((X+transpose(X,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,-7) ) ) ) +transpose(transpose(arpeggio(transpose(shuffle((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(X,-7) ) ) ,-7) ) ,-5) ,7) ) ,-5) ,4,6) ,4) ) +transpose((transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,7) ) ) ,4,6) ,-7) |(((shuffle(transpose(transpose((step(transpose(X,4) ,12) +transpose(echo(X,4,6) ,12) ) ,-7) ,-7) ) +transpose((((shuffle(((transpose(X,4) +transpose(echo(X,4,6) ,12) ) |(transpose(X,-7) +transpose((X+X) ,7) ) ) ) +transpose(((X|X) |shuffle(X) ) ,12) ) +((((X|X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +transpose(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo((X|X) ,4,6) ,7) ) ,12) ) ) +(((transpose(transpose(transpose(X,-7) ,4) ,-5) +transpose((arpeggio(echo(X,4,6) ) +transpose(echo(X,4,6) ,4) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) +transpose(echo((transpose(arpeggio(X) ,4) +transpose(transpose((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ,4) ,12) ) ,4,6) ,12) ) ) ,12) ) +transpose(transpose((step(arpeggio(arpeggio(transpose(X,-5) ) ) ,12) +((X+X) |transpose((X|X) ,-5) ) ) ,-7) ,12) ) +(((transpose(((transpose(X,4) +transpose(transpose(X,4) ,12) ) +transpose(((transpose((X+transpose(X,7) ) ,-5) +transpose(shuffle(X) ,4) ) +transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,12) ) ,7) ) ,7) ) ,-5) +transpose((transpose(transpose(X,4) ,-5) +transpose(transpose(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((((X+transpose((X|X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((transpose(X,4) +transpose((X+X) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose((X|X) ,7) ) ,-5) ,12) ) ,4) ) +transpose((((transpose(X,-7) +transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) +transpose(X,7) ) |(transpose(transpose(X,4) ,-7) +transpose(transpose(echo(X,4,6) ,-5) ,12) ) ) ,7) ) +(((echo((X+transpose((X+transpose(X,12) ) ,7) ) ,4,6) |transpose((arpeggio(X) |X) ,-5) ) +transpose((transpose(echo(step(X,12) ,4,6) ,-7) +transpose(echo(arpeggio(((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,7) ) ,12) ) +transpose(transpose((transpose(X,-7) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) ,7) ) ,4) ,-7) ) ) ) ) ,7) ) +transpose(transpose((transpose(((transpose(transpose(X,-5) ,-7) |(X+transpose(X,12) ) ) +transpose(X,4) ) ,-5) |(step(transpose(X,-7) ,12) +transpose(transpose((transpose(transpose(transpose(X,-5) ,4) ,-5) +transpose((X+transpose(X,7) ) ,4) ) ,-7) ,7) ) ) ,-5) ,4) ) +transpose(transpose((transpose((transpose((transpose((shuffle(X) +transpose((X|X) ,7) ) ,-7) +transpose(transpose((transpose((X|X) ,-5) +shuffle(X) ) ,-5) ,12) ) ,4) |transpose(transpose(transpose(transpose(echo(transpose(X,-7) ,4,6) ,-5) ,-5) ,4) ,-7) ) ,-5) +transpose((transpose((transpose(shuffle(step(X,12) ) ,-7) |echo(X,4,6) ) ,-5) +arpeggio(shuffle(shuffle((X|X) ) ) ) ) ,-7) ) ,4) ,7) ) +transpose((((transpose(shuffle(step((arpeggio(((transpose(X,4) +transpose(X,7) ) +transpose((X|X) ,12) ) ) +transpose((X+X) ,-5) ) ,12) ) ,-5) +transpose((step(((((X|X) +(X+X) ) +transpose(transpose(step(((transpose(X,-7) +(X+transpose(X,12) ) ) +transpose((X|X) ,7) ) ,12) ,-5) ,4) ) +transpose(shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) |transpose(X,4) ) ) ,7) ) ,12) |transpose(transpose(((X|X) +transpose(transpose(X,4) ,7) ) ,-5) ,4) ) ,7) ) +transpose(((((((echo(transpose(shuffle((((X+transpose(X,4) ) +transpose((X+X) ,7) ) +transpose(echo((X+X) ,4,6) ,12) ) ) ,-7) ,4,6) +transpose(transpose(echo((step(X,12) +transpose(X,-7) ) ,4,6) ,-7) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,7) ) +transpose((((X+echo(X,4,6) ) |X) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,4) ) +transpose(step(transpose((shuffle(((X+X) +X) ) |transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ) ,-7) ,12) ,7) ) +(shuffle(transpose(transpose(((transpose(shuffle(X) ,-7) +transpose((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +(X+transpose((transpose(X,-5) +transpose(X,-5) ) ,12) ) ) ,-7) ,4) ) +transpose(transpose((X+transpose(X,4) ) ,-5) ,7) ) ) +((transpose(echo((echo(step(X,12) ,4,6) +transpose((((X+X) +transpose((transpose(X,-7) +shuffle(X) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,4,6) ,4) +transpose((transpose(((((X+X) |(X|X) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,-5) ) ,-7) +transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,4) ) ,7) ) +transpose(step((arpeggio(step(((transpose((X|X) ,4) +transpose((transpose(X,4) |(echo(X,4,6) |transpose(X,-5) ) ) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,12) ) |transpose(X,4) ) ,12) ,7) ) ) ,7) ) +((transpose(transpose((transpose(transpose((X+echo(X,4,6) ) ,4) ,4) |((X+(X+transpose(X,7) ) ) +(transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ) ) ,4) ,-7) +transpose((arpeggio(((step((X|(X+X) ) ,12) +transpose((transpose((X+X) ,-5) +transpose((X|X) ,7) ) ,4) ) +transpose((echo((X|X) ,4,6) +(transpose(transpose(X,-7) ,-5) +transpose((X+transpose(X,12) ) ,12) ) ) ,7) ) ) |transpose((transpose(((transpose(X,4) +(X|X) ) +transpose(transpose(X,4) ,12) ) ,-7) |shuffle((echo(transpose(X,-7) ,4,6) +((X+transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ) ) ) ,-5) ) ,7) ) |(step(((arpeggio(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(step((X+transpose(arpeggio(X) ,12) ) ,12) ,12) ) ,-7) ) +transpose((step(transpose(transpose(step(X,12) ,4) ,-5) ,12) |arpeggio(shuffle(echo(((X+X) +transpose((X|X) ,12) ) ,4,6) ) ) ) ,4) ) +transpose(step(((echo(((X+X) +transpose(transpose(X,-7) ,7) ) ,4,6) +(X+transpose(((transpose(X,-7) +transpose((X|X) ,4) ) +transpose((X|X) ,7) ) ,12) ) ) |(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) |(transpose(X,4) |(transpose(X,-7) +shuffle(X) ) ) ) ) ,12) ,7) ) ,12) |echo((transpose(step(((X|X) +transpose(step((X+transpose(echo(X,4,6) ,7) ) ,12) ,12) ) ,12) ,-7) +transpose(transpose(arpeggio((transpose(transpose(transpose(transpose(X,4) ,-7) ,4) ,-5) +transpose(((((X+X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |((X+X) +transpose((((X|X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) ) ,12) ) ) ,-7) ,7) ) ,4,6) ) ) ) ,7) ) +transpose(transpose(((((transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,-7) +transpose(transpose((echo(echo((X+X) ,4,6) ,4,6) +transpose(((((X+X) +transpose((X|(X+transpose(X,12) ) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |((X|X) +transpose(X,-5) ) ) ,7) ) ,4) ,-5) ) +transpose(transpose((((transpose(transpose(echo(X,4,6) ,-7) ,-5) +transpose(((X+transpose(X,7) ) +transpose(arpeggio((X|X) ) ,7) ) ,12) ) +transpose((transpose(echo(X,4,6) ,-7) |echo(X,4,6) ) ,12) ) +transpose(echo((transpose((shuffle((echo(X,4,6) +(X+X) ) ) +transpose(X,-7) ) ,4) +(X|X) ) ,4,6) ,7) ) ,-5) ,12) ) +transpose((transpose((((((((transpose(X,4) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(echo(step(((X+X) +(X|X) ) ,12) ,4,6) ,4) ) +transpose(step((transpose(X,4) |(transpose(X,4) +transpose(echo(X,4,6) ,12) ) ) ,12) ,7) ) +transpose(X,12) ) +transpose((transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ,-5) +shuffle((X|X) ) ) ,12) ) +transpose((((((X+transpose((X+X) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,12) ) |transpose(((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |(X+transpose(X,7) ) ) |(transpose(shuffle(X) ,-7) +(X|(X|X) ) ) ) ,4) ) ,12) ) ,4) +((transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) ,-7) +transpose((((((((X+transpose(X,12) ) |X) +transpose((X+X) ,4) ) +transpose((transpose(X,-5) |transpose(X,4) ) ,7) ) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(((echo(transpose(X,4) ,4,6) +transpose(shuffle(((X+X) +transpose(X,12) ) ) ,7) ) |transpose(transpose(X,-5) ,4) ) ,7) ) ,4) ) +transpose(transpose(transpose(((transpose(arpeggio(X) ,-7) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose((shuffle(X) |(X|(echo(X,4,6) +transpose(transpose(X,-7) ,12) ) ) ) ,7) ) ,4) ,-5) ,7) ) ) ,4) ) +transpose((transpose(((((shuffle(transpose(transpose(transpose(X,-5) ,4) ,-7) ) +transpose(((((X|X) +(X+transpose(X,7) ) ) |(step(transpose(echo(X,4,6) ,4) ,12) +transpose((((X+transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,4) ) ,12) ) ) +transpose((((X|X) +(X|X) ) +transpose(X,4) ) ,4) ) ,4) ) +transpose(echo(transpose(step((transpose(X,4) +transpose(step(X,12) ,12) ) ,12) ,-5) ,4,6) ,7) ) +((arpeggio(transpose((X+transpose(X,12) ) ,4) ) +transpose(echo((transpose(transpose(X,4) ,4) +transpose(X,-7) ) ,4,6) ,4) ) +transpose((transpose(echo((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,-7) +arpeggio(step(X,12) ) ) ,7) ) ) +transpose((((((step((X+X) ,12) +transpose((X+(X|X) ) ,4) ) +transpose(shuffle(step(X,12) ) ,7) ) +transpose(transpose((echo(X,4,6) +transpose(shuffle(X) ,7) ) ,-5) ,12) ) +step(((X+transpose(shuffle(X) ,12) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,12) ) +transpose(((X+transpose(transpose(X,-5) ,7) ) |(X+transpose(X,12) ) ) ,-5) ) ,4) ) ,4) +(transpose((transpose((X+transpose(transpose(X,4) ,7) ) ,-7) +echo(transpose(transpose(transpose(X,-5) ,-7) ,4) ,4,6) ) ,4) +(shuffle((echo(transpose(X,4) ,4,6) +transpose(transpose(echo(arpeggio(X) ,4,6) ,4) ,7) ) ) +(transpose((transpose(transpose(transpose(X,-7) ,-5) ,-7) |((echo(X,4,6) |X) |echo(transpose(X,-5) ,4,6) ) ) ,4) +step(((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ,12) ) ) ) ) ,7) ) ,-5) ,-5) ) +transpose((transpose(((((arpeggio((echo(shuffle(transpose(transpose(transpose(X,-7) ,4) ,-7) ) ,4,6) +transpose((transpose(echo(transpose((X+X) ,4) ,4,6) ,4) +(transpose((transpose(X,-7) +transpose(X,-5) ) ,-5) +transpose(step(X,12) ,4) ) ) ,7) ) ) |transpose(transpose(echo(((echo(step(echo(X,4,6) ,12) ,4,6) +transpose(step((X+X) ,12) ,4) ) +transpose(arpeggio(((X+transpose(X,7) ) +shuffle(X) ) ) ,7) ) ,4,6) ,-7) ,-7) ) +transpose(((((echo(transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ,-7) ,4,6) |(X+transpose(shuffle((X+X) ) ,12) ) ) +transpose(((((transpose(transpose(X,4) ,4) +transpose(transpose((echo((X+X) ,4,6) |arpeggio(transpose(X,4) ) ) ,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((((X+transpose(transpose(X,-5) ,12) ) +transpose((X|X) ,7) ) +transpose(transpose(((((X|X) +transpose(X,4) ) +transpose((shuffle(X) +transpose(shuffle(X) ,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,12) ) ,4) ) +transpose((transpose(X,-5) +transpose(transpose((X+transpose(X,-7) ) ,-5) ,12) ) ,7) ) ,12) ) +transpose(transpose(transpose((transpose((X+transpose(X,12) ) ,4) |echo(X,4,6) ) ,-7) ,-7) ,4) ) +transpose(arpeggio((((transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,4) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(shuffle(transpose(X,-5) ) ,-7) ) ) ,7) ) ,4) ) +transpose(((shuffle(X) |X) +transpose(arpeggio(transpose(shuffle(X) ,-5) ) ,12) ) ,7) ) +transpose(arpeggio(transpose(transpose((((X+transpose(X,7) ) +transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ,-7) ,-5) ) ,12) ) ,-5) +transpose(transpose(shuffle((transpose(transpose(transpose(step((X+transpose(X,12) ) ,12) ,-5) ,-7) ,-7) |(arpeggio((transpose(transpose(X,4) ,-7) +(step((X+transpose(X,12) ) ,12) |(transpose((X+transpose((X+X) ,12) ) ,-5) +(X|((X|X) +transpose(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ) ) ) ) ) +(((transpose((((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) +transpose(X,7) ) +transpose(step(transpose(X,-5) ,12) ,-5) ) ,-7) +transpose(transpose((transpose(echo(X,4,6) ,4) +transpose(transpose(X,-5) ,7) ) ,-7) ,7) ) +transpose(shuffle(((transpose(arpeggio(step(X,12) ) ,4) +transpose((shuffle(step(X,12) ) |transpose(step(X,12) ,-5) ) ,7) ) |(((X+transpose(((X+transpose(X,7) ) +X) ,7) ) +transpose(step((X+X) ,12) ,7) ) +transpose(echo((X+shuffle(X) ) ,4,6) ,7) ) ) ) ,4) ) +transpose(transpose(transpose(transpose(arpeggio((X|X) ) ,4) ,-5) ,4) ,7) ) ) ) ) ,4) ,7) ) ,7) ) random seed used was 146934479

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