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 20 generations the expression "X" became this: transpose((((((echo(transpose(echo((((((arpeggio((X+X) ) +transpose(transpose((((X+X) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ,4) ) +transpose(arpeggio(arpeggio((X+transpose(X,7) ) ) ) ,7) ) |((transpose(X,4) +transpose(X,12) ) +shuffle(X) ) ) +transpose(step(arpeggio(transpose(transpose(transpose(X,-5) ,-5) ,4) ) ,12) ,4) ) +transpose((echo(transpose((transpose(X,4) +transpose(X,-5) ) ,-5) ,4,6) +((((X+transpose(X,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) +(((X+transpose(X,7) ) +transpose((X|X) ,12) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) ) +transpose(X,12) ) ) ,7) ) ,4,6) ,-5) ,4,6) |transpose(transpose(((transpose(X,4) |(X+transpose(X,12) ) ) |((transpose(transpose(X,-5) ,4) |((X+X) +transpose(X,7) ) ) +shuffle(transpose(X,-7) ) ) ) ,-5) ,-7) ) +transpose(transpose(transpose((step(((arpeggio(transpose(step(((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) +transpose(arpeggio(X) ,7) ) ,12) ,-5) ) +transpose((transpose(((transpose((X+X) ,-7) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) |echo(transpose(X,4) ,4,6) ) ,-5) |(transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) +(shuffle(transpose(X,-7) ) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ) ) ,4) ) +transpose(((((X|X) |transpose(echo(X,4,6) ,-5) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((((X|X) +transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ,12) ) ,4) ) +transpose(arpeggio((arpeggio(X) |echo(X,4,6) ) ) ,7) ) ,7) ) ,12) +transpose((step((transpose(transpose(X,-7) ,4) +transpose((transpose(X,-5) |(X+transpose(X,12) ) ) ,12) ) ,12) +transpose(transpose(transpose(transpose(transpose(X,-5) ,-5) ,4) ,-5) ,7) ) ,7) ) ,-5) ,-5) ,7) ) +transpose(transpose(echo(step(((transpose(arpeggio(transpose(transpose(echo(X,4,6) ,-7) ,-5) ) ,-7) +transpose(((shuffle(transpose((echo((X+X) ,4,6) |(X+transpose(X,7) ) ) ,-7) ) +transpose(arpeggio(transpose((transpose((((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) |transpose(transpose(X,-7) ,-5) ) ,-5) +transpose(transpose(arpeggio(echo(((X+transpose(X,7) ) +transpose(X,-7) ) ,4,6) ) ,4) ,12) ) ,-7) ) ,4) ) +transpose(((transpose((((X+X) |transpose((X|X) ,4) ) +transpose(X,4) ) ,-7) +(shuffle(X) +transpose(arpeggio(X) ,12) ) ) +transpose((((X+transpose(transpose(X,-7) ,12) ) +transpose(step(X,12) ,12) ) +transpose((transpose((X+transpose(transpose(X,4) ,12) ) ,4) +transpose(((X+transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,7) ) ,12) ) ,7) ) ,7) ) ,-5) ) |((echo(transpose(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,4) ,4,6) |((X|X) +transpose(transpose((((((transpose(X,4) +transpose(X,7) ) |((X+transpose(X,12) ) +X) ) +transpose(arpeggio(X) ,4) ) +transpose(((transpose(transpose(X,-5) ,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4) ) +transpose(step((X|X) ,12) ,7) ) ,7) ) +((((((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,4) ) +transpose(X,7) ) +transpose((((X+X) +transpose((X|X) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose((((X+transpose((X|X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |shuffle(X) ) ,7) ) ) ,-7) ,12) ) ) +transpose(step(((transpose(transpose(arpeggio(step(X,12) ) ,4) ,-7) +transpose(echo(transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ,-5) ,4,6) ,4) ) +transpose(arpeggio((transpose(X,-5) |X) ) ,7) ) ,12) ,4) ) ) ,12) ,4,6) ,-7) ,12) ) +transpose(((echo((transpose(step(arpeggio(((transpose(X,-7) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) +transpose((arpeggio(transpose(X,-7) ) +transpose(transpose(X,-7) ,12) ) ,12) ) ) ,12) ,-5) |shuffle(arpeggio(transpose(((transpose((transpose(X,4) +X) ,-7) |((X+transpose(X,4) ) +transpose((X+X) ,7) ) ) |transpose((((transpose((X+transpose(X,7) ) ,-5) |X) +transpose(step(X,12) ,7) ) +transpose(echo(shuffle(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,4,6) ,7) ) ,4) ) ,-7) ) ) ) ,4,6) +transpose(step(shuffle((((((transpose(X,-5) +transpose(transpose((X+X) ,-5) ,12) ) +transpose((step(shuffle(transpose(X,4) ) ,12) +transpose((X|X) ,12) ) ,-5) ) +transpose(transpose((transpose(((transpose(transpose(X,-5) ,-5) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) ,4) |arpeggio(arpeggio(X) ) ) ,4) ,7) ) +transpose(transpose(transpose((arpeggio(arpeggio(X) ) +transpose(echo((X|X) ,4,6) ,7) ) ,4) ,-7) ,12) ) |(transpose(shuffle(transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,-7) ) ,-5) +(arpeggio(((shuffle((X|X) ) |X) |shuffle(X) ) ) |shuffle(((((X|X) +transpose(arpeggio(arpeggio(X) ) ,7) ) +transpose(shuffle((transpose(X,-7) +X) ) ,12) ) +transpose(arpeggio(echo(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) ) ,12) ) ) ) ) ) ) ,12) ,12) ) |transpose(echo(((((transpose(transpose(step(step(step((((transpose(X,-7) +X) +transpose(transpose(X,-5) ,4) ) |step(transpose(X,-7) ,12) ) ,12) ,12) ,12) ,-7) ,-5) +transpose(transpose((transpose(transpose((X+X) ,-5) ,-5) +((transpose(transpose(transpose(X,-7) ,-7) ,4) |(step(X,12) |transpose((X|X) ,4) ) ) |(arpeggio(X) +transpose(X,-5) ) ) ) ,4) ,4) ) +transpose(transpose(echo((((transpose((((X+transpose(X,12) ) +X) +(X|X) ) ,-5) +transpose(arpeggio((((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) ,-5) ) |((((X+transpose(X,12) ) +transpose((transpose(X,-7) +transpose(shuffle(X) ,-7) ) ,4) ) +transpose(echo(arpeggio((X+transpose(X,12) ) ) ,4,6) ,7) ) +transpose(transpose(arpeggio(X) ,4) ,12) ) ) +transpose(transpose(transpose(((step(transpose(echo(X,4,6) ,-5) ,12) +transpose(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +step(step(transpose(shuffle((X|X) ) ,-7) ,12) ,12) ) ,-7) ,4) ,7) ) ,4,6) ,-5) ,7) ) +transpose((transpose(transpose(echo(transpose(arpeggio(X) ,4) ,4,6) ,-5) ,-7) +transpose(transpose(transpose(echo(((arpeggio(X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4,6) ,-5) ,4) ,12) ) ,7) ) |echo((transpose(transpose(transpose(transpose(transpose((X|(X+transpose(X,7) ) ) ,-5) ,-7) ,4) ,-5) ,-7) +transpose(transpose(step(((X|(X|X) ) +transpose(transpose(X,4) ,4) ) ,12) ,-5) ,7) ) ,4,6) ) ,4,6) ,-7) ) ,12) ) +arpeggio(((transpose((transpose(transpose(transpose((transpose(((((transpose(X,-5) +transpose((X|X) ,4) ) +transpose(X,7) ) |(echo(X,4,6) +arpeggio((X|X) ) ) ) +transpose(transpose(echo(transpose(transpose(X,-7) ,-5) ,4,6) ,4) ,12) ) ,-7) +transpose(transpose(transpose(transpose(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,-5) ,4) ,-7) ,7) ) ,-7) ,4) ,-7) +transpose((((step(arpeggio(X) ,12) +transpose((transpose(X,-5) +transpose(shuffle((X|X) ) ,-7) ) ,12) ) |transpose(transpose(((transpose(transpose(X,4) ,-7) +transpose(transpose(X,4) ,7) ) +transpose(((X|(X+X) ) +transpose(transpose(X,-5) ,12) ) ,4) ) ,-7) ,-5) ) +(((transpose(((echo(transpose(transpose((X+X) ,-7) ,4) ,4,6) +(echo(X,4,6) +transpose(transpose(X,-7) ,7) ) ) +transpose((((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) +transpose(step(((X+transpose(((X|X) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose((X+transpose((X|X) ,7) ) ,7) ) ,12) ,12) ) ,7) ) ,4) +transpose(transpose(step(transpose(transpose(X,-5) ,-5) ,12) ,-7) ,4) ) +transpose(step(echo((X|step(X,12) ) ,4,6) ,12) ,7) ) +transpose(transpose((step(transpose((((X|X) +transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) ,-5) ,12) +transpose(((transpose(X,-7) |(X+X) ) |(X+transpose(X,12) ) ) ,-7) ) ,-7) ,7) ) ) ,-5) ) ,-7) +(transpose(echo((((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |((X+transpose(X,7) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ) |transpose(X,4) ) |transpose(((X+((X|X) +X) ) +transpose(step((X+transpose((X+X) ,12) ) ,12) ,7) ) ,-5) ) ,4,6) ,4) +transpose(((((transpose(((transpose(((step(X,12) +(X+transpose(X,7) ) ) +transpose(transpose(echo(shuffle(arpeggio(X) ) ,4,6) ,-5) ,7) ) ,-5) +transpose(((echo(shuffle(X) ,4,6) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(((((X+transpose(shuffle(echo(X,4,6) ) ,12) ) +transpose((shuffle(step((X+transpose(X,7) ) ,12) ) |transpose(transpose(transpose(X,-7) ,4) ,-5) ) ,4) ) +transpose((echo(step(X,12) ,4,6) |transpose(X,4) ) ,7) ) |((((((X+transpose(X,7) ) |(X+X) ) +(transpose(X,-7) |echo(X,4,6) ) ) +transpose(transpose((transpose(X,-5) +transpose(X,7) ) ,-5) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) +step(((transpose(X,-7) +transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose((X|X) ,7) ) ,12) ) ) ,7) ) ,4) |(shuffle((((transpose(X,-7) +transpose(X,12) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ) +transpose(transpose(transpose(transpose((transpose(X,4) +transpose(X,-7) ) ,4) ,4) ,-5) ,12) ) ) +transpose(transpose(arpeggio(step(step((step((X+(step(X,12) +transpose(X,-7) ) ) ,12) +transpose(((arpeggio(X) +transpose(transpose(X,4) ,12) ) +transpose(X,12) ) ,12) ) ,12) ,12) ) ,-7) ,12) ) |((arpeggio(((shuffle(transpose(X,4) ) +arpeggio((X+transpose(X,12) ) ) ) +transpose(transpose(X,-7) ,4) ) ) +transpose(transpose(transpose(X,-7) ,-5) ,-5) ) +transpose((((transpose(X,-7) +transpose(arpeggio(X) ,12) ) +transpose(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) +(((((X+transpose(X,12) ) +transpose((transpose(X,-7) +transpose(X,4) ) ,4) ) +transpose(((X+X) +transpose(transpose(X,-7) ,7) ) ,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ) ,-5) ) ) +transpose(shuffle(transpose((step(((transpose(X,4) +transpose(transpose(X,4) ,7) ) |(((transpose(X,4) |X) +transpose((X|X) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ) ,12) |(step(echo(transpose((X+transpose(X,12) ) ,4) ,4,6) ,12) +step(arpeggio(((X+transpose(X,12) ) |(echo(X,4,6) +transpose(X,12) ) ) ) ,12) ) ) ,-7) ) ,7) ) ,12) ) ) |step(((transpose((((step(X,12) +transpose(X,-5) ) +(((X+transpose((X|X) ,12) ) |(echo(X,4,6) |echo(X,4,6) ) ) +(((X+transpose(X,4) ) +transpose(X,7) ) |echo((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ) ) ) +transpose(step((((((transpose(X,-7) |transpose(X,-5) ) +transpose((X+X) ,12) ) |echo((X|X) ,4,6) ) |(transpose(arpeggio(arpeggio(X) ) ,4) +transpose((X|(X+X) ) ,12) ) ) |((transpose(step(X,12) ,-5) +transpose((X|X) ,12) ) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(arpeggio(X) ,12) ) ) ) ,12) ,-5) ) ,-7) |(((transpose(X,4) +transpose(((shuffle(step(((transpose(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ,4) +arpeggio(X) ) +transpose(step((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) |echo(X,4,6) ) ,12) ,7) ) ,12) ) +transpose(transpose((arpeggio(arpeggio(((X+X) |X) ) ) |(transpose(transpose(transpose(X,-7) ,-7) ,-7) +transpose((X+transpose(transpose(X,-7) ,-7) ) ,12) ) ) ,4) ,4) ) +transpose((arpeggio((transpose((X+transpose(X,7) ) ,4) +transpose(X,-5) ) ) +transpose(transpose(step((transpose((X+transpose(X,12) ) ,4) +step(X,12) ) ,12) ,-5) ,7) ) ,7) ) ,-7) ) +transpose(shuffle(step(echo((transpose(transpose(transpose(X,-7) ,-5) ,-7) |arpeggio(X) ) ,4,6) ,12) ) ,4) ) +transpose(transpose(((step(transpose(X,-7) ,12) |X) +(transpose(shuffle((X|X) ) ,-5) +((echo(transpose(X,-7) ,4,6) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) +transpose(transpose(((X+transpose(X,12) ) |transpose(X,-5) ) ,4) ,12) ) ) ) ,-7) ,7) ) ) +transpose(arpeggio(((arpeggio((step(transpose((((shuffle(X) +(X|X) ) |transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,-7) ) +transpose(X,7) ) ,4) ,12) +transpose(((transpose(X,4) +transpose(transpose((X+X) ,-7) ,4) ) +transpose((X+transpose((transpose(X,4) +transpose(transpose(X,-5) ,12) ) ,12) ) ,7) ) ,7) ) ) +transpose(((((transpose((echo(step(X,12) ,4,6) |transpose((X|X) ,4) ) ,4) |((X|X) +((X+transpose(X,12) ) +transpose(X,4) ) ) ) +transpose((transpose(echo(echo((((shuffle(X) +transpose(X,12) ) +transpose((transpose(X,-5) +arpeggio(X) ) ,4) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,4,6) ,4,6) ,4) +(step(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ,12) ) ) ,12) ) +transpose((((shuffle(shuffle(X) ) +step(step(X,12) ,12) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose(transpose(X,-5) ,12) ) ,12) ) +(((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) |(X+transpose(X,12) ) ) ) ,4) ) +transpose((((transpose(transpose(transpose(X,-7) ,4) ,-7) +transpose((transpose(transpose(X,4) ,-7) |transpose(transpose((X+X) ,4) ,-7) ) ,12) ) |transpose(transpose(X,4) ,4) ) |transpose(transpose((shuffle(X) +transpose(X,7) ) ,-5) ,4) ) ,7) ) ,12) ) +(((transpose(X,4) +transpose(arpeggio(step(((arpeggio(X) |X) +transpose(transpose(arpeggio(step(X,12) ) ,4) ,7) ) ,12) ) ,12) ) |shuffle((arpeggio(transpose(transpose(transpose((transpose(X,4) +transpose((X+X) ,-5) ) ,4) ,4) ,4) ) +transpose((arpeggio(shuffle((((transpose(X,4) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +transpose((transpose(X,-5) +transpose(X,7) ) ,7) ) ) ) +transpose(((arpeggio(X) +transpose((shuffle(X) +(X+transpose(X,12) ) ) ,12) ) |transpose((transpose(X,4) +(X|X) ) ,-7) ) ,7) ) ,12) ) ) ) |(((((X+shuffle(X) ) +transpose(arpeggio(step(transpose(X,4) ,12) ) ,7) ) +transpose((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,-7) ,7) ) ,7) ) |transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ) +((transpose(transpose(transpose(transpose(X,-7) ,-5) ,-7) ,4) +transpose(arpeggio(step(step((transpose(X,4) +X) ,12) ,12) ) ,4) ) +transpose(((shuffle(X) +transpose(arpeggio(transpose(transpose(step(X,12) ,-5) ,-7) ) ,4) ) +transpose((((transpose(shuffle(X) ,-7) +((shuffle(X) +transpose(transpose((X+X) ,4) ,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose((transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) +transpose(transpose(shuffle(X) ,4) ,12) ) ,4) ) +transpose(((X+transpose(X,7) ) |(X+X) ) ,7) ) ,7) ) ,7) ) ) ) ) ) ,7) ) ,12) ) ) ) ,4) random seed used was 224754606

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