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 16 generations the expression "X" became this: ((((transpose((((((transpose(X,-7) +step(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,12) ) +((((X|X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) ) +transpose(transpose(transpose(transpose((X|X) ,-7) ,-7) ,-7) ,4) ) +transpose((shuffle(X) +echo(X,4,6) ) ,7) ) +transpose((transpose(echo(transpose(X,-5) ,4,6) ,-7) +transpose(shuffle((transpose((((echo(X,4,6) +X) +transpose(transpose(echo(X,4,6) ,4) ,12) ) +transpose((transpose(transpose(X,4) ,4) +transpose(X,12) ) ,7) ) ,4) +(echo(step(X,12) ,4,6) +transpose(echo(step((X+X) ,12) ,4,6) ,12) ) ) ) ,12) ) ,12) ) ,-7) +transpose(transpose((transpose((transpose(((transpose(X,4) +transpose(X,12) ) +transpose(shuffle(X) ,-5) ) ,-5) +(transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) |(transpose(echo(X,4,6) ,-7) +transpose(transpose(shuffle(X) ,-5) ,7) ) ) ) ,4) +((shuffle(X) +transpose(((((X+X) +transpose((X+X) ,12) ) +transpose(shuffle(transpose((X+X) ,-5) ) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) |transpose(X,-7) ) ,7) ) ,4) ) +transpose((X+X) ,7) ) ) ,-5) ,12) ) |echo(((((step(((X+X) +transpose(X,-5) ) ,12) +((X+transpose(X,12) ) +transpose(step(X,12) ,12) ) ) +transpose(transpose(echo((step(X,12) +(X+transpose(X,12) ) ) ,4,6) ,-5) ,7) ) |(((transpose(transpose(X,-5) ,-5) +(echo(X,4,6) +(X+transpose(transpose(X,-5) ,12) ) ) ) +transpose((shuffle(shuffle(X) ) +transpose(transpose(step(X,12) ,4) ,7) ) ,12) ) +transpose((arpeggio(((X|X) +(X|X) ) ) +transpose((X+transpose(((transpose(X,-7) +transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,7) ) ,12) ) ) +transpose(shuffle(transpose(((((step((X+transpose(X,12) ) ,12) +transpose(transpose(shuffle((X+transpose(X,7) ) ) ,-7) ,4) ) +transpose((((transpose(X,4) +transpose(X,7) ) +transpose((transpose(X,4) |(X|X) ) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,7) ) +transpose(transpose((X+transpose(transpose(X,-7) ,12) ) ,-5) ,4) ) +transpose((X+X) ,7) ) ,-5) ) ,12) ) ,4,6) ) +transpose(shuffle(transpose(((transpose((X+(transpose(X,4) +X) ) ,4) +transpose((transpose(transpose(shuffle(X) ,-7) ,4) |(arpeggio(arpeggio((step(X,12) |transpose(X,-7) ) ) ) +transpose(step(transpose(transpose((X|X) ,4) ,4) ,12) ,12) ) ) ,4) ) +transpose((transpose((shuffle(transpose((X|X) ,-7) ) +transpose(((((transpose(transpose(X,4) ,-5) +transpose((((X+transpose(X,12) ) |arpeggio(X) ) +shuffle(X) ) ,4) ) +transpose((transpose(X,4) +X) ,7) ) +transpose((echo(X,4,6) +transpose(transpose(X,4) ,-5) ) ,4) ) +transpose(transpose((arpeggio((X|X) ) +((X+X) +(X|X) ) ) ,4) ,7) ) ,12) ) ,-5) +transpose(((transpose(X,4) +transpose(X,-5) ) +(X+transpose(step(transpose(X,-5) ,12) ,12) ) ) ,12) ) ,7) ) ,-5) ) ,4) ) +transpose((((transpose(((transpose(step(transpose(transpose(X,-7) ,4) ,12) ,-7) +transpose((transpose((((transpose(transpose(X,-7) ,-5) |transpose((X+X) ,-5) ) +transpose((transpose(X,4) |(X+X) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,4) +transpose((((X+transpose((X|X) ,4) ) +transpose(shuffle(X) ,7) ) |X) ,7) ) ,4) ) +transpose(transpose(transpose((arpeggio(transpose((X+transpose(X,12) ) ,-5) ) +transpose((X+X) ,12) ) ,4) ,4) ,7) ) ,4) +transpose((echo(echo(transpose(X,-7) ,4,6) ,4,6) |transpose((arpeggio(shuffle(X) ) |transpose((shuffle(shuffle(X) ) +transpose(X,-5) ) ,4) ) ,-5) ) ,7) ) +echo(transpose(((transpose(transpose(((echo(X,4,6) |((X+transpose(X,12) ) +X) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,-5) ,-5) +((((((X+transpose(X,12) ) |echo(X,4,6) ) +((X+X) +(X|X) ) ) |transpose((X+(X+X) ) ,-7) ) +transpose((((X+X) +transpose(((X+transpose((X|X) ,7) ) +echo(step(X,12) ,4,6) ) ,12) ) |transpose((X|X) ,-5) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ) |arpeggio(arpeggio(((X+transpose(X,7) ) +transpose((X|((transpose(X,-7) +transpose((X|X) ,4) ) +transpose(X,7) ) ) ,7) ) ) ) ) ,-7) ,4,6) ) |transpose((transpose(transpose(step((((X+X) |shuffle(X) ) +step(X,12) ) ,12) ,-5) ,-7) +((((shuffle((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) |transpose(arpeggio(transpose((X+transpose(X,12) ) ,-7) ) ,-5) ) +transpose(transpose(step(X,12) ,4) ,7) ) +transpose((transpose((transpose(X,-7) |((transpose(X,-7) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) |transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,-7) ) ,12) ) +(((arpeggio(X) +X) |((transpose((X+X) ,-7) +transpose(transpose(X,4) ,4) ) +transpose(shuffle(arpeggio(arpeggio(X) ) ) ,7) ) ) +transpose((((transpose(X,-7) |X) |(X+transpose((transpose(X,-5) +transpose(X,7) ) ,7) ) ) +transpose(echo(arpeggio(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,7) ) ,12) ) ) ) ,-5) ) ,7) ) random seed used was 1 EXPR = transpose(arpeggio(transpose(shuffle(((transpose(step(step(X,12) ,12) ,-7) +transpose(transpose(transpose((X+X) ,-7) ,-7) ,12) ) |echo((transpose(transpose(X,-7) ,-5) +transpose((transpose(transpose(X,4) ,4) |(((X+transpose(X,12) ) +X) |X) ) ,12) ) ,4,6) ) ) ,4) ) ,4) random seed used was 0 EXPR = (arpeggio(transpose((transpose(echo((((transpose(((X+transpose(X,4) ) |((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) ,-7) +transpose(transpose((((arpeggio(X) +shuffle(X) ) |(X+transpose(X,12) ) ) +transpose((echo(X,4,6) +(X+transpose(echo(X,4,6) ,12) ) ) ,12) ) ,-5) ,7) ) |(echo(transpose(arpeggio(X) ,4) ,4,6) |((transpose((X+transpose(step(X,12) ,12) ) ,4) +transpose(X,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ) +transpose(transpose((X+X) ,4) ,12) ) ,4,6) ,-7) +((transpose(echo(step(X,12) ,4,6) ,-7) +transpose(shuffle(((echo(transpose((transpose((X+transpose(X,7) ) ,4) +transpose(X,4) ) ,-5) ,4,6) +transpose((arpeggio(X) +(X+transpose(X,7) ) ) ,12) ) |(((X+X) |((transpose(transpose(X,-7) ,4) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) ) +transpose((((X+transpose((X+transpose(X,7) ) ,7) ) |((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(((echo(X,4,6) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,-5) ) ,7) ) ) ) ,4) ) +transpose((transpose(transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,4) ,-5) +transpose(echo(transpose(echo(transpose(step(X,12) ,-5) ,4,6) ,-5) ,4,6) ,7) ) ,7) ) ) ,-5) ) +(step(arpeggio(echo((echo((transpose(echo(X,4,6) ,4) +transpose(arpeggio(transpose(X,4) ) ,4) ) ,4,6) +transpose((transpose(echo((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(step((X|X) ,12) ,12) ) ,4,6) ,-7) +transpose(((X+transpose(transpose(X,-5) ,7) ) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ,4) ) ,7) ) ,4,6) ) ,12) +transpose(transpose((step(transpose(((transpose(transpose((echo(((echo(X,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4,6) +transpose(arpeggio(step((X|X) ,12) ) ,-5) ) ,-7) ,4) +transpose(step(X,12) ,12) ) +(step(((((transpose((X|X) ,-5) +transpose((X+X) ,4) ) +transpose(step(X,12) ,4) ) +transpose(arpeggio((arpeggio(X) +(X+transpose(step(X,12) ,7) ) ) ) ,7) ) |echo((X|X) ,4,6) ) ,12) |(transpose(transpose(transpose(X,-5) ,4) ,-7) |(arpeggio((transpose(X,4) |X) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |arpeggio(X) ) ,4) ,12) ) ) ) ) ,-7) ,12) +echo(transpose(((((transpose(transpose(transpose(((X+transpose(X,12) ) +(X+X) ) ,4) ,-5) ,4) +transpose(transpose((step(X,12) +transpose(X,7) ) ,-7) ,12) ) |((transpose(transpose((((X|(X+X) ) +transpose(step((X+X) ,12) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,-7) +transpose(echo(step(transpose(((X+transpose(X,7) ) +(X+X) ) ,-5) ,12) ,4,6) ,4) ) +transpose(((shuffle((X|X) ) +transpose(((X|X) +transpose((X+X) ,7) ) ,-5) ) |((((echo(X,4,6) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) ) +transpose(shuffle((transpose(echo((X+transpose(transpose(shuffle(X) ,-7) ,12) ) ,4,6) ,-5) +echo((X+transpose(X,7) ) ,4,6) ) ) ,12) ) +transpose(transpose(step(((step(X,12) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) +step(((X+transpose(X,12) ) |transpose(X,4) ) ,12) ) ,12) ,-7) ,7) ) ,4) ,4,6) ) ,-7) ,12) ) ) random seed used was 0 EXPR = (((transpose((((transpose((arpeggio(X) +transpose(shuffle(shuffle(X) ) ,12) ) ,-7) +(arpeggio(echo((transpose(X,-5) +transpose(((X|X) +transpose(step(X,12) ,7) ) ,7) ) ,4,6) ) |transpose(((X|X) |X) ,-7) ) ) +(((echo(X,4,6) |(((echo(X,4,6) +transpose(transpose(X,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((step(X,12) +transpose(step(X,12) ,7) ) ,7) ) ) +transpose((echo((X+transpose(transpose(X,-7) ,12) ) ,4,6) +transpose(((transpose(X,4) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(((X|X) +transpose(step(X,12) ,12) ) ,7) ) ,7) ) ,12) ) +echo(transpose((X|X) ,-7) ,4,6) ) ) |echo((step((X+transpose((((X|X) +transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ,12) ) ,12) |(((((transpose((X+X) ,-7) +transpose(transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(transpose((transpose(X,-7) +transpose((X|X) ,12) ) ,-7) ,7) ) +step(X,12) ) +transpose(transpose(shuffle(X) ,-7) ,12) ) +transpose((((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(transpose(arpeggio(transpose(transpose(X,-7) ,4) ) ,-5) ,12) ) +transpose(arpeggio(((X+transpose(X,7) ) +transpose(X,7) ) ) ,12) ) ,12) ) ) ,4,6) ) ,-5) +transpose(((arpeggio(arpeggio(((X+transpose(X,12) ) |transpose(X,-7) ) ) ) +transpose(step(shuffle((X|X) ) ,12) ,4) ) +transpose(transpose(transpose(echo(arpeggio((X+X) ) ,4,6) ,4) ,4) ,7) ) ,-5) ) |(transpose((transpose(transpose(transpose(echo(transpose((transpose((X|X) ,4) +transpose(transpose(X,4) ,-7) ) ,-7) ,4,6) ,-7) ,-7) ,-5) +transpose(echo((step((((X|shuffle(X) ) +transpose(step((X+X) ,12) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,12) |step((X|step(X,12) ) ,12) ) ,4,6) ,7) ) ,-5) +((((shuffle(shuffle(((X+X) +(X+transpose(X,12) ) ) ) ) +transpose(((transpose((X+transpose(X,12) ) ,4) |(transpose(X,-5) |transpose(X,4) ) ) +transpose(transpose(((X+X) +X) ,-7) ,7) ) ,4) ) +transpose(transpose((echo(X,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,-7) ,7) ) +transpose((arpeggio(shuffle(transpose(arpeggio((step(X,12) +(X+transpose(X,7) ) ) ) ,-5) ) ) |echo((arpeggio(transpose(X,4) ) +(((X+(X+X) ) +(arpeggio(X) +transpose(X,7) ) ) +transpose(X,-5) ) ) ,4,6) ) ,12) ) +transpose((((echo(transpose((((transpose((X|X) ,-5) |X) +transpose(transpose((shuffle(X) +transpose(arpeggio(X) ,7) ) ,-5) ,4) ) +transpose((((step(X,12) +transpose(((X|X) +echo(X,4,6) ) ,7) ) +transpose((X+(X+transpose(X,7) ) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,7) ) ,7) ) ,4) ,4,6) +transpose(echo((step((transpose(step(X,12) ,-7) +(X+transpose(shuffle(X) ,7) ) ) ,12) |arpeggio((transpose(shuffle(X) ,-5) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ) ) ,4,6) ,4) ) +transpose(transpose(((transpose((step((X|X) ,12) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) ,-5) +transpose((step((X+X) ,12) +transpose(transpose(transpose(transpose(X,-7) ,4) ,-7) ,12) ) ,4) ) +transpose(((echo(X,4,6) |(echo(X,4,6) +X) ) +transpose(transpose((X|X) ,-7) ,4) ) ,7) ) ,-7) ,7) ) +arpeggio((transpose(((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) +transpose(echo(((arpeggio(shuffle(X) ) +transpose(transpose(X,4) ,7) ) +transpose(((transpose(X,4) |shuffle((X+X) ) ) +(transpose(X,-5) |(X|(X|X) ) ) ) ,12) ) ,4,6) ,7) ) ) ) ,12) ) ) ) +transpose(transpose(transpose(echo(arpeggio(arpeggio(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +(step(X,12) +transpose(X,-7) ) ) ,-7) ) ) ,4,6) ,4) ,-7) ,7) ) random seed used was 0

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