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(((step(((((step(((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,12) +transpose((transpose(X,-7) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(arpeggio(((X+transpose(X,-5) ) +transpose(((shuffle(step(X,12) ) +transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ) ,7) ) |(((transpose(transpose(X,4) ,4) +((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) |(transpose(X,-7) |transpose(X,-7) ) ) +transpose(arpeggio(arpeggio(echo(X,4,6) ) ) ,-7) ) ) +transpose(transpose(echo(X,4,6) ,4) ,4) ) ,12) +((((step(transpose(transpose(X,-5) ,4) ,12) |step(step(transpose(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,12) ,12) ) +transpose((transpose((X+echo(X,4,6) ) ,-7) +transpose((X|X) ,4) ) ,7) ) +transpose(transpose(transpose(((X+X) +(X+transpose(X,12) ) ) ,4) ,4) ,12) ) +(transpose(transpose(transpose(X,-7) ,-7) ,4) |(arpeggio(X) +transpose(transpose(arpeggio(X) ,4) ,4) ) ) ) ) |((shuffle(transpose(echo(transpose(((X+X) |transpose(X,-5) ) ,4) ,4,6) ,4) ) +transpose(transpose((transpose(((transpose((((step(X,12) +transpose(transpose(X,-5) ,7) ) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(((X+X) +transpose((X+X) ,7) ) ,7) ) ,-5) |transpose(X,4) ) +(X|transpose(transpose(X,-7) ,-7) ) ) ,4) |shuffle(transpose(transpose(transpose((transpose(X,-5) +transpose((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,-5) ,4) ,-7) ) ) ,-7) ,4) ) +transpose(((transpose((echo((((X+(X+X) ) +transpose(transpose((shuffle((X|X) ) +transpose((transpose(X,-5) +transpose(X,-5) ) ,12) ) ,4) ,4) ) +transpose((step(X,12) |X) ,7) ) ,4,6) |(step(X,12) +transpose(transpose(X,-5) ,7) ) ) ,4) |transpose(transpose(shuffle((X|(X+X) ) ) ,-5) ,4) ) |(((X+(echo(transpose(X,-5) ,4,6) +X) ) |transpose(transpose(step((X|X) ,12) ,-5) ,-5) ) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ) ,7) ) ) ,-5) +((transpose((transpose(shuffle(X) ,-7) |(step(transpose(step(X,12) ,-5) ,12) +transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) ) ,-5) +transpose(transpose(transpose(transpose((X+transpose((arpeggio(X) +transpose(X,-5) ) ,12) ) ,-7) ,4) ,-7) ,12) ) |step(((transpose((shuffle(((echo(transpose(echo(X,4,6) ,-7) ,4,6) +(echo(X,4,6) |X) ) +step((((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ,-7) +transpose(step(echo(X,4,6) ,12) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ) +((transpose(transpose((step(transpose(shuffle(X) ,-7) ,12) |step(transpose(X,4) ,12) ) ,4) ,-5) |((step((X|shuffle(transpose(X,4) ) ) ,12) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) +transpose(((transpose(((X+X) |X) ,4) +step(X,12) ) +transpose(step(X,12) ,12) ) ,12) ) ) +transpose((shuffle((transpose(X,4) +transpose((shuffle(transpose(X,-7) ) +transpose(step(transpose(X,-5) ,12) ,12) ) ,7) ) ) +transpose(shuffle(transpose(shuffle((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) ) ,4) ) ,12) ) ,12) ) ) ,4) +transpose(((transpose(shuffle(transpose((((X+X) +transpose(X,12) ) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ,4) ) ,4) |(transpose(transpose((transpose(X,-7) +transpose((transpose((X+transpose(X,12) ) ,4) |transpose((X+transpose(X,7) ) ,-5) ) ,4) ) ,-5) ,-5) +shuffle(transpose(step(X,12) ,-5) ) ) ) |(transpose(transpose(arpeggio(((arpeggio(((echo(X,4,6) +transpose((X+X) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(X,4) ) +transpose(((X|X) +(X+transpose(X,7) ) ) ,7) ) ) ,-5) ,4) +transpose(transpose(transpose(echo(transpose(transpose(X,-5) ,4) ,4,6) ,4) ,4) ,12) ) ) ,7) ) |((((arpeggio((echo(transpose(X,4) ,4,6) +transpose(transpose(X,-5) ,7) ) ) +transpose(((transpose((X+transpose(((X+transpose(X,12) ) +X) ,7) ) ,4) +transpose(((shuffle((transpose(X,-7) |(X+X) ) ) +echo(X,4,6) ) +((((X+transpose(X,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) ) +transpose(transpose(X,4) ,7) ) +((shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ) ) ,4) ) +transpose(transpose(transpose(shuffle(X) ,-7) ,4) ,7) ) ,4) ) +transpose(arpeggio((transpose((X+X) ,4) |(X+transpose((X+transpose(X,12) ) ,7) ) ) ) ,7) ) |shuffle((shuffle((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) +transpose(((transpose(X,-7) |transpose(X,4) ) +step(X,12) ) ,4) ) ) ) +transpose(step((echo((step((((transpose(X,-5) +transpose(transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,4) ,4) ) +transpose(transpose(((X+transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) ,4) ,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,12) +transpose((transpose(transpose(X,-7) ,-5) |(((X+transpose(X,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(transpose(arpeggio((X+X) ) ,-7) ,7) ) ) ,7) ) ,4,6) +((((echo((transpose(transpose((X+X) ,-7) ,-7) |arpeggio(X) ) ,4,6) +transpose((((X+transpose(X,7) ) +X) +transpose(transpose(X,4) ,12) ) ,4) ) +(transpose(step(transpose(X,-5) ,12) ,-7) |transpose(arpeggio(X) ,-5) ) ) +transpose(arpeggio(echo(transpose(echo(X,4,6) ,-7) ,4,6) ) ,4) ) +transpose(((step(transpose(X,-5) ,12) +(((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) |((transpose(X,-5) +transpose((X+X) ,7) ) |X) ) ) +transpose((((step(X,12) +transpose((X|(X+X) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,12) ) ,7) ) ) ,12) ,7) ) ) ,12) ) ) +transpose(transpose(transpose((((arpeggio((((((shuffle(X) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +((step((X|X) ,12) +transpose(X,4) ) +transpose((shuffle(X) +transpose((X|X) ,12) ) ,7) ) ) +transpose(transpose((step(X,12) |((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ) ,4) ,12) ) +transpose(step(step((X+X) ,12) ,12) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ) +transpose((((((transpose(X,4) +transpose(((transpose(X,-5) +(X+X) ) |(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(transpose(X,-7) ,7) ) ) ,7) ) +(arpeggio(transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose((shuffle(X) +X) ,12) ) ) +transpose((transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-5) ,4) |((((transpose(step((X+X) ,12) ,-7) +transpose(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ,12) ) +transpose(transpose(transpose(((transpose(X,-7) +transpose((X+X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,-5) ,4) ) +transpose((transpose(transpose(X,4) ,-7) +transpose(transpose(step(X,12) ,-5) ,12) ) ,7) ) +transpose((((((X+transpose(transpose(X,4) ,7) ) +transpose(step(X,12) ,4) ) +transpose(((X+transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ,7) ) +transpose((((transpose(transpose(X,-5) ,-7) +X) +transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ,12) ) ) ,4) ) +transpose(echo(arpeggio(transpose(transpose((((X+X) +transpose(step(X,12) ,12) ) +transpose((X|X) ,12) ) ,-5) ,4) ) ,4,6) ,7) ) |transpose(shuffle(((step((transpose((X+transpose(X,7) ) ,-7) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ,12) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4) ) ,4) ) +transpose((step(transpose(((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,4) |(X+echo((X+X) ,4,6) ) ) |transpose((X+X) ,-5) ) ,4) ,12) +transpose(transpose((step(transpose(X,-5) ,12) +(((X+step(transpose(X,-7) ,12) ) +echo((((X|X) |X) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ,4,6) ) +transpose((transpose(transpose((X|X) ,-7) ,4) |(((X+transpose(X,12) ) +transpose(((transpose(X,4) +transpose((X+transpose(X,12) ) ,12) ) +X) ,4) ) +transpose(transpose(arpeggio(transpose(X,4) ) ,-5) ,7) ) ) ,7) ) ) ,-5) ,12) ) ,7) ) |echo(((transpose((transpose(transpose(X,4) ,-5) |step(((transpose(X,4) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,4) |transpose((shuffle(shuffle(transpose(transpose((X+X) ,4) ,-5) ) ) +transpose(transpose(((X+X) +transpose(((X|X) +transpose(X,12) ) ,7) ) ,-5) ,12) ) ,-5) ) +transpose(transpose((((X+transpose((X+(X|X) ) ,12) ) +(transpose((X+transpose(X,12) ) ,-5) |transpose(X,-7) ) ) +arpeggio(transpose(X,-7) ) ) ,4) ,12) ) ,4,6) ) ,4) ,-7) ,4) ) +transpose(arpeggio(shuffle(transpose(transpose((shuffle((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose(step(echo(X,4,6) ,12) ,12) ) ) |((((((X+transpose((X|X) ,7) ) +transpose(X,4) ) +transpose((echo(X,4,6) |transpose(X,-5) ) ,7) ) +transpose(step(transpose((X+X) ,4) ,12) ,4) ) +transpose((echo(transpose(X,-5) ,4,6) +transpose(transpose(X,-7) ,7) ) ,7) ) +shuffle(transpose(step(transpose(X,-7) ,12) ,4) ) ) ) ,4) ,-7) ) ) ,7) ) random seed used was 71 EXPR = (transpose(arpeggio(shuffle(echo(((((((X|X) +transpose(arpeggio(X) ,12) ) +transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) +(X|(X+X) ) ) |(transpose(arpeggio(step(X,12) ) ,4) +(step(X,12) +X) ) ) ,4,6) ) ) ,-5) |transpose(((((((transpose(((((X+X) +transpose((transpose((X|X) ,-5) |(X+transpose(X,7) ) ) ,4) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) |arpeggio(echo(X,4,6) ) ) ,-5) |(transpose((((X+transpose(shuffle(X) ,4) ) +transpose(step(X,12) ,7) ) |transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ) ,-7) |(transpose(transpose((X+transpose(X,7) ) ,-5) ,4) +transpose(echo((X+transpose(step((X+X) ,12) ,12) ) ,4,6) ,7) ) ) ) +transpose(echo(transpose(step(step(arpeggio(transpose(X,-5) ) ,12) ,12) ,-7) ,4,6) ,12) ) +transpose(transpose(transpose((((step((X+transpose(X,12) ) ,12) +transpose((arpeggio(X) +transpose(transpose(X,-5) ,12) ) ,-7) ) +transpose(transpose((((X+transpose(X,12) ) |X) +transpose((((echo(X,4,6) |transpose(X,-7) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,-5) ,12) ) +transpose((transpose(transpose(transpose(transpose(X,4) ,-5) ,4) ,-5) +step(X,12) ) ,12) ) ,-5) ,-5) ,7) ) +(transpose(arpeggio(echo((((transpose(X,-7) +(transpose(X,-7) +X) ) |transpose((X+transpose(X,12) ) ,4) ) |(echo(X,4,6) |(X+transpose(transpose((X+X) ,-7) ,7) ) ) ) ,4,6) ) ,-7) |shuffle((X+X) ) ) ) +transpose(step(((X+transpose(step(X,12) ,12) ) +(shuffle(step(X,12) ) +((X+(X|X) ) |(X+(X+X) ) ) ) ) ,12) ,12) ) |transpose(transpose((transpose(step(transpose((transpose((X|X) ,-7) +transpose(step(X,12) ,12) ) ,4) ,12) ,4) |(transpose((transpose(X,4) +transpose((X+transpose(transpose(X,-5) ,7) ) ,-7) ) ,-7) +arpeggio(((transpose(X,-5) +transpose((X|X) ,7) ) +(transpose(X,-7) +transpose(echo(X,4,6) ,7) ) ) ) ) ) ,-7) ,4) ) ,-7) ) random seed used was 0

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