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: (step((transpose(transpose(step(transpose(step((transpose(X,4) +transpose(X,12) ) ,12) ,4) ,12) ,-5) ,-7) +(arpeggio(shuffle(shuffle(((echo((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(X,4) ) ,4,6) +transpose((X+transpose(step((X+transpose(X,7) ) ,12) ,12) ) ,4) ) +transpose((transpose(X,4) +transpose(X,-7) ) ,7) ) ) ) ) |echo(transpose(((transpose(echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) ,-7) +transpose((transpose(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,-5) +step((transpose(X,-5) |shuffle(X) ) ,12) ) ,12) ) +transpose(((shuffle(shuffle((X+transpose(X,12) ) ) ) +transpose((transpose(X,4) |echo(X,4,6) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,4) ,4,6) ) ) ,12) +transpose(transpose((((((transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) +transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) +(((X|X) +shuffle(X) ) +transpose((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose((transpose(X,4) |transpose(X,-7) ) ,12) ) ,7) ) ) |(((transpose(X,4) +(X|X) ) +transpose(X,12) ) |transpose(X,-5) ) ) |((transpose(X,4) |(X+X) ) |echo(((transpose(X,4) +transpose(((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ,12) ) |(echo(transpose(X,4) ,4,6) +(X+(X|X) ) ) ) ,4,6) ) ) ,-5) +transpose(arpeggio(shuffle(transpose((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) |arpeggio(echo((X+transpose(X,12) ) ,4,6) ) ) ,-7) ) ) ,4) ) +transpose(transpose(transpose((transpose(transpose(X,4) ,4) |step(arpeggio(transpose(transpose(X,-5) ,-7) ) ,12) ) ,4) ,4) ,7) ) +((step(((((((transpose((X+transpose(X,12) ) ,4) |((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) +transpose(((X|X) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ,4) ) +transpose((((X+X) +transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) |(X|transpose((X|X) ,4) ) ) +transpose(transpose((X|transpose((X+X) ,4) ) ,4) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,12) +(((step(X,12) +transpose(X,7) ) |echo(arpeggio(transpose(X,4) ) ,4,6) ) +transpose(shuffle((transpose(X,4) +transpose((echo(X,4,6) +transpose(((X+transpose(X,12) ) +(X+X) ) ,12) ) ,7) ) ) ,12) ) ) |transpose((arpeggio(((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(X,-7) ,12) ) ) +step((((step(transpose(X,-5) ,12) +(step(shuffle(X) ,12) +transpose(arpeggio(step(X,12) ) ,7) ) ) +transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose((X|transpose(transpose(X,-7) ,-7) ) ,7) ) ,12) ) ,-5) ) ) +transpose(transpose(((((transpose(transpose(X,-7) ,4) +transpose((arpeggio(X) +transpose(step((X|X) ,12) ,7) ) ,4) ) +transpose(step(transpose(step(X,12) ,-5) ,12) ,7) ) +transpose((step((X+X) ,12) |((X+transpose(X,7) ) +transpose(shuffle(X) ,12) ) ) ,7) ) +transpose(echo((echo(shuffle((X+transpose(arpeggio(X) ,12) ) ) ,4,6) +((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) +transpose(transpose((transpose(X,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,12) ) ) ,4,6) ,7) ) ,4) ,12) ) +transpose(transpose(transpose(((echo((X|X) ,4,6) +(transpose((X+X) ,-7) |(X+transpose(X,7) ) ) ) |((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) |transpose(X,-7) ) +transpose(transpose((((X|X) +transpose((transpose(X,-5) +(X+transpose(X,12) ) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,12) ) ) ,4) ,-7) ,-7) ) ,-7) ,12) ) random seed used was 12 EXPR = transpose((((shuffle(step((transpose(transpose((X+X) ,4) ,-7) |((transpose(arpeggio(X) ,-7) +(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) +transpose(echo((X+arpeggio(transpose(X,4) ) ) ,4,6) ,7) ) ) ,12) ) +transpose((shuffle((((transpose(arpeggio(transpose(transpose((X+transpose(X,12) ) ,4) ,-5) ) ,-5) +transpose(shuffle((arpeggio(transpose((X|X) ,-5) ) +(shuffle(X) +transpose(((X+transpose(X,7) ) |X) ,-7) ) ) ) ,4) ) +transpose((((((X|transpose(transpose(X,-7) ,-7) ) +transpose(((((X|X) +transpose((X+transpose(X,7) ) ,12) ) +transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose((transpose(X,4) |X) ,7) ) ,4) ) +transpose(transpose((step(X,12) +(X+X) ) ,4) ,7) ) +transpose(((((X|X) +transpose(transpose(X,-5) ,7) ) +transpose((X|(X+X) ) ,4) ) +transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,12) ) |((echo(transpose(X,-7) ,4,6) +transpose((((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(((X+transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,7) ) |step(transpose(transpose(X,4) ,4) ,12) ) ) ,7) ) +transpose((((transpose(X,4) +transpose((X+echo(X,4,6) ) ,7) ) |(X+transpose(X,7) ) ) |arpeggio((transpose(transpose(transpose(X,-7) ,-7) ,-5) +transpose(((transpose(X,4) +X) +transpose((X|X) ,-5) ) ,12) ) ) ) ,12) ) ) |transpose((((step(((X+X) |X) ,12) +transpose((shuffle((X+X) ) +X) ,12) ) |transpose(transpose(arpeggio(X) ,4) ,-5) ) +transpose((step((transpose((X+transpose(X,12) ) ,-5) +transpose(arpeggio(X) ,-5) ) ,12) |(transpose((transpose(X,4) +transpose(echo(X,4,6) ,12) ) ,4) +(((arpeggio(X) +transpose(X,7) ) |X) +transpose(step((echo((X|X) ,4,6) +((X+X) +transpose(X,7) ) ) ,12) ,7) ) ) ) ,4) ) ,4) ) ,4) ) +transpose(arpeggio(((((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) +transpose((echo((X+X) ,4,6) |transpose(((transpose(transpose(X,-5) ,4) +transpose(X,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,-7) ) ,4) ) +transpose((shuffle(transpose(X,4) ) +transpose(transpose(X,-5) ,12) ) ,7) ) +transpose((((echo((X+X) ,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |(transpose((X+X) ,4) +transpose(transpose(step(transpose(X,-7) ,12) ,4) ,7) ) ) +transpose(echo(X,4,6) ,12) ) ,-5) ) |(step(step(transpose(transpose(X,-7) ,4) ,12) ,12) |transpose((X+transpose(arpeggio((X|X) ) ,7) ) ,-7) ) ) ) ,7) ) |transpose((transpose(transpose(echo(((X|(X|X) ) +transpose((transpose(X,4) +transpose(transpose(X,-5) ,7) ) ,7) ) ,4,6) ,-5) ,4) |transpose((((step(transpose(transpose(step(transpose(X,-5) ,12) ,-5) ,-5) ,12) +transpose(transpose((echo(X,4,6) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) +((transpose(X,4) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,12) ) ,-5) ,12) ) +transpose((((step((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) +transpose(((X+X) +transpose((X|X) ,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +echo(X,4,6) ) ,7) ) |shuffle(transpose((transpose((X+X) ,4) +transpose(shuffle(X) ,12) ) ,-5) ) ) ,4) ) ,-5) ) ,4) random seed used was 0 EXPR = transpose(((transpose(((transpose(X,4) |arpeggio(X) ) +transpose((transpose((arpeggio(X) +(X+X) ) ,-7) +transpose(echo((step(X,12) |X) ,4,6) ,12) ) ,-5) ) ,4) +(transpose((transpose((X|X) ,-7) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,4) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,12) ) ) +((step(((transpose((echo(X,4,6) +step(X,12) ) ,-7) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +shuffle(X) ) ,4) ) +transpose((transpose(transpose(X,-7) ,-5) +echo((X+transpose(X,12) ) ,4,6) ) ,7) ) ,12) +transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4) ,4) ,4) ) |(step((transpose((((step(X,12) +transpose((X+X) ,7) ) +transpose((X+transpose(step((X+X) ,12) ,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) |echo(transpose((((transpose(X,-5) +X) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,4,6) ) ,12) +(arpeggio(transpose(transpose((X|(X+transpose(X,12) ) ) ,4) ,4) ) |shuffle((shuffle((shuffle(X) |(X|X) ) ) |(((X+transpose(transpose(X,-5) ,12) ) +transpose(step(X,12) ,12) ) +transpose((X|X) ,7) ) ) ) ) ) ) ) ,4) random seed used was 0 EXPR = transpose(((echo(transpose((step(step((((X+transpose(step(X,12) ,12) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ,12) +transpose(X,-7) ) ,-7) ,4,6) +transpose(((((((shuffle(echo(((transpose((X|transpose(X,-5) ) ,-7) +transpose(shuffle(X) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,4,6) ) +transpose((arpeggio(transpose(X,-5) ) +(transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-5) |echo(arpeggio(step(X,12) ) ,4,6) ) ) ,12) ) |echo((((transpose(shuffle((X+transpose(X,12) ) ) ,-5) +(step(X,12) |(X|(X+transpose(X,12) ) ) ) ) +transpose(((transpose(X,-7) +transpose(X,-7) ) |(X|X) ) ,4) ) +transpose(((transpose(shuffle((X+transpose(X,7) ) ) ,-5) +transpose(transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) ,-5) ,7) ) +transpose(((((X+transpose(X,12) ) +transpose((transpose(X,-5) |(X+X) ) ,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,12) ) ,7) ) ,4,6) ) +((((transpose((step(X,12) +transpose(arpeggio(shuffle(X) ) ,7) ) ,4) +transpose(transpose((transpose(X,-7) |arpeggio((transpose(X,-5) +(X|X) ) ) ) ,4) ,12) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +((X|X) |transpose(X,-5) ) ) +transpose(((((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) +(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +shuffle(transpose(X,4) ) ) ,12) ) ) +transpose(transpose(step(arpeggio(step(transpose((X+X) ,-5) ,12) ) ,12) ,4) ,4) ) +transpose((echo((step(arpeggio((X+X) ) ,12) |((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ) ,4,6) +transpose((step(((step((X+transpose(X,7) ) ,12) |arpeggio(transpose(X,-7) ) ) |(((X+transpose(X,7) ) +transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ) ,12) +transpose(((transpose(X,-7) +transpose(X,-7) ) +transpose(transpose(X,-5) ,12) ) ,7) ) ,7) ) ,7) ) ) +((((transpose(X,-7) |(echo(X,4,6) +((X+transpose((X+X) ,4) ) +transpose(X,7) ) ) ) +transpose((((shuffle((((X|X) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) ) +(((((transpose(X,-5) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(echo(arpeggio(X) ,4,6) ,12) ) ) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) ,4) ) +transpose((transpose((transpose(X,-7) |(arpeggio(transpose(X,-5) ) +transpose(transpose(X,-5) ,-7) ) ) ,-7) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) ,7) ) +transpose(transpose((echo((transpose(X,-5) |(X+transpose(transpose(X,-5) ,12) ) ) ,4,6) +transpose(transpose(step(X,12) ,-5) ,4) ) ,-5) ,12) ) ) +transpose(transpose((transpose(transpose(shuffle((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) ,-7) |arpeggio(transpose((X+(transpose(X,-7) +(X|X) ) ) ,-5) ) ) ,-5) ,4) ) +transpose(echo(arpeggio(transpose((shuffle(echo(transpose((X+transpose(arpeggio(X) ,7) ) ,-5) ,4,6) ) +transpose((arpeggio(transpose(X,4) ) +arpeggio(transpose(X,4) ) ) ,12) ) ,-7) ) ,4,6) ,7) ) ,4) ) +transpose((((((shuffle(echo((((echo(transpose(X,4) ,4,6) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) +transpose(transpose(X,-5) ,-7) ) +(shuffle((X+transpose(X,12) ) ) +transpose(arpeggio((transpose(X,-7) +transpose(X,-5) ) ) ,12) ) ) ,4,6) ) +transpose(transpose(echo(((((X+transpose(X,12) ) +X) |transpose(shuffle(X) ,-7) ) +transpose((X+transpose(shuffle(arpeggio((X+X) ) ) ,7) ) ,7) ) ,4,6) ,-5) ,7) ) +transpose(transpose(shuffle((transpose(X,-7) |(transpose(((X+transpose(X,12) ) |arpeggio(X) ) ,-7) +transpose(shuffle(transpose((X+transpose(X,12) ) ,-7) ) ,7) ) ) ) ,4) ,4) ) +transpose(((transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) ,-7) |((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(echo(X,4,6) ,-5) ) ) +(transpose(shuffle(transpose(X,4) ) ,-5) |transpose((X|X) ,4) ) ) ,7) ) +transpose(((step(transpose(transpose(step(transpose(X,4) ,12) ,-7) ,-7) ,12) +transpose(echo(transpose(transpose(X,-5) ,-5) ,4,6) ,12) ) +transpose(((arpeggio(transpose((X+X) ,4) ) +((transpose(X,-7) +transpose((echo(X,4,6) +X) ,4) ) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ) +((transpose(transpose(transpose(X,-7) ,-7) ,-7) +transpose((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) |((transpose(X,4) +transpose(((X+transpose(X,12) ) +X) ,4) ) +transpose(echo((X|X) ,4,6) ,7) ) ) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ) ,-7) ) ,7) ) +(shuffle((step(transpose((arpeggio(X) +(X+X) ) ,4) ,12) +transpose((transpose((step(transpose(X,-7) ,12) +transpose(X,-7) ) ,4) +transpose(((transpose((X|X) ,4) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(((((X|X) |shuffle(X) ) +transpose(transpose((X+step(X,12) ) ,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,7) ) ,7) ) ) +((arpeggio(arpeggio(((shuffle(((transpose(X,-7) +X) +transpose((shuffle(X) +X) ,7) ) ) +transpose(step(step((X+transpose(X,7) ) ,12) ,12) ,7) ) +((((X+X) +transpose(((X+X) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) +transpose(((shuffle((X|X) ) +transpose(((X+X) +transpose((X|X) ,7) ) ,4) ) +transpose((transpose(X,-5) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) ,7) ) +step((((X+transpose(X,4) ) +transpose(X,7) ) +step(X,12) ) ,12) ) ) ) ) +(((transpose((transpose(X,4) |(X|X) ) ,-5) +transpose(echo(transpose(X,4) ,4,6) ,12) ) |(transpose(transpose(X,-5) ,-5) +transpose(step(X,12) ,4) ) ) +((shuffle(((X+X) |transpose(X,4) ) ) +transpose(echo(X,4,6) ,-7) ) |((transpose((arpeggio(X) |X) ,4) +(transpose(transpose(X,-7) ,-5) +transpose(shuffle(step(X,12) ) ,7) ) ) +transpose(((((X+X) |arpeggio(transpose(X,-5) ) ) +transpose(((X|X) +X) ,12) ) +transpose(echo(X,4,6) ,-5) ) ,7) ) ) ) ) +((transpose(((transpose(echo(shuffle((X+transpose(X,7) ) ) ,4,6) ,4) +transpose(((transpose(X,-5) |transpose(X,-7) ) +(transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ) ,4) ) +transpose((transpose((transpose(X,-7) +X) ,4) +step(transpose(X,-7) ,12) ) ,7) ) ,-5) +transpose(transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ,4) ,4) ) +transpose(((transpose(transpose(((transpose(X,-7) +(X|transpose(X,-5) ) ) +echo(transpose(X,-7) ,4,6) ) ,-5) ,-7) +transpose((transpose(((transpose(X,-5) +step(X,12) ) +(arpeggio((X+transpose(X,12) ) ) |X) ) ,-7) |((transpose((transpose(X,4) |(X+shuffle(X) ) ) ,-5) +transpose((((X+transpose(X,12) ) +transpose((X+transpose((X+X) ,7) ) ,7) ) |(((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ) ,12) ) |(transpose(transpose(X,4) ,4) |arpeggio((transpose((X+transpose(X,7) ) ,-7) +step(transpose(X,-7) ,12) ) ) ) ) ) ,4) ) +transpose(transpose((transpose(step(X,12) ,-7) +transpose((echo(X,4,6) |transpose(X,4) ) ,12) ) ,-5) ,7) ) ,7) ) ) ) ) ,7) ) ,-5) random seed used was 0

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