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: (((((echo(((shuffle(shuffle(X) ) +transpose(echo((transpose(X,-5) +(X+X) ) ,4,6) ,4) ) +transpose((transpose(X,4) +((transpose(X,-7) +X) +transpose(X,4) ) ) ,7) ) ,4,6) +step(((step(arpeggio(X) ,12) +transpose(((X+X) |(X+transpose(X,7) ) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) +transpose(echo(shuffle(X) ,4,6) ,-5) ) +transpose((((transpose(transpose(transpose((transpose(X,-7) +transpose(X,4) ) ,-5) ,-7) ,-5) +(arpeggio(arpeggio((X+transpose(X,4) ) ) ) |echo((X+transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,4,6) ) ) |transpose(transpose(step(step(X,12) ,12) ,-7) ,-7) ) |((((transpose((X+X) ,-5) +transpose(((((X|X) +echo((X+X) ,4,6) ) +transpose((arpeggio(X) +transpose(((X+X) +transpose(X,4) ) ,12) ) ,7) ) |transpose((X+transpose(X,7) ) ,4) ) ,7) ) +transpose((((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) |transpose((X+X) ,-7) ) ,4) ) +transpose((((transpose(transpose(echo(arpeggio(X) ,4,6) ,-7) ,4) +transpose((transpose(X,4) +echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,4) ) +transpose((((transpose(transpose(X,4) ,-7) |transpose(transpose(X,4) ,4) ) +transpose((X+(X|X) ) ,12) ) +transpose(transpose(X,4) ,-7) ) ,7) ) |shuffle((arpeggio(step(X,12) ) +transpose(transpose(arpeggio(X) ,-5) ,12) ) ) ) ,7) ) +((transpose((((((transpose(transpose(X,-5) ,4) +transpose(((((X+transpose(X,7) ) +transpose((X+X) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(transpose(((echo(X,4,6) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,-7) ,7) ) |(X+transpose(((X+X) +transpose(step(X,12) ,12) ) ,7) ) ) +transpose((echo(transpose(arpeggio(X) ,-7) ,4,6) |((echo(transpose(shuffle(X) ,-7) ,4,6) +transpose((transpose(X,-7) |echo(transpose(X,4) ,4,6) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,4) ) +transpose(((((echo(X,4,6) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |(transpose(X,-7) |step(X,12) ) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,7) ) ,4) +transpose(step((transpose((X+transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,-5) |((((((step(X,12) |(X+X) ) +transpose(echo((X|X) ,4,6) ,7) ) |step((X+transpose(transpose(X,4) ,12) ) ,12) ) +transpose((step(step(X,12) ,12) +echo((transpose(X,4) +transpose(X,12) ) ,4,6) ) ,7) ) +transpose(echo(((transpose((X+transpose(X,7) ) ,4) |shuffle(X) ) |echo((X|X) ,4,6) ) ,4,6) ,4) ) +transpose(((X+transpose((X+transpose(X,12) ) ,7) ) +transpose(X,-5) ) ,7) ) ) ,12) ,4) ) +transpose(((transpose(step(echo(shuffle(arpeggio(X) ) ,4,6) ,12) ,-7) +transpose((shuffle(X) |transpose((transpose(transpose(X,-7) ,-7) +transpose(X,4) ) ,4) ) ,12) ) +transpose((step(((transpose(X,-5) +transpose(X,12) ) +(X+transpose(X,12) ) ) ,12) +transpose(transpose((transpose((X+transpose(X,12) ) ,-7) |(transpose(X,-7) +((transpose(arpeggio(X) ,-7) +transpose((arpeggio(X) |arpeggio(X) ) ,4) ) +transpose(X,7) ) ) ) ,4) ,7) ) ,7) ) ,7) ) ) ) ,7) ) +transpose(transpose(transpose((arpeggio(transpose(transpose(((((X+arpeggio(X) ) +step((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) +(((X+X) +transpose(((X|X) |(X+X) ) ,7) ) +transpose((X+transpose(X,12) ) ,-7) ) ) +transpose((transpose(X,-5) +echo(X,4,6) ) ,4) ) ,-7) ,-5) ) +(((((echo(step(echo(X,4,6) ,12) ,4,6) +((((transpose(X,4) +(X+transpose(X,12) ) ) |transpose(X,4) ) +transpose(((transpose(X,-5) +transpose(X,12) ) +transpose(echo(transpose((X|X) ,4) ,4,6) ,7) ) ,4) ) +transpose((transpose((transpose(X,-7) |X) ,-7) +transpose(((X|(X+X) ) +transpose(((X|X) |echo(X,4,6) ) ,12) ) ,7) ) ,7) ) ) +transpose(transpose((((step(echo(X,4,6) ,12) |step(transpose(X,-7) ,12) ) +transpose(step(transpose(X,4) ,12) ,7) ) +(step(transpose((X|X) ,4) ,12) +((transpose(X,-7) +(X+transpose(X,12) ) ) +transpose((arpeggio(X) |X) ,-7) ) ) ) ,4) ,4) ) +transpose(step(((shuffle((X+transpose(X,7) ) ) +transpose(((X|X) |echo((X+X) ,4,6) ) ,12) ) |transpose((X+(X|X) ) ,4) ) ,12) ,7) ) +transpose(step((transpose((transpose(echo(X,4,6) ,-5) +(transpose(X,4) +arpeggio(echo(X,4,6) ) ) ) ,4) |transpose(echo(((transpose(transpose(X,-5) ,-5) |(X+echo(X,4,6) ) ) +transpose(((X+X) +X) ,4) ) ,4,6) ,-7) ) ,12) ,4) ) +transpose(echo(transpose(step((((arpeggio(X) |(X+transpose(arpeggio(X) ,12) ) ) +transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,4,6) ,12) ) |transpose((transpose(X,4) +(X+transpose(X,12) ) ) ,-7) ) ,12) ,-5) ,4,6) ,7) ) ) ,-5) ,-5) ,-5) ) +transpose((step((transpose(step(((((transpose(transpose(X,4) ,4) +((echo(X,4,6) +transpose(transpose(X,4) ,7) ) +transpose(arpeggio((X|X) ) ,12) ) ) +(transpose(X,-7) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ) +transpose(echo(((arpeggio((X+transpose(X,7) ) ) |(arpeggio(X) +transpose(transpose(X,4) ,7) ) ) +transpose(((X+echo(X,4,6) ) +transpose(step((X|X) ,12) ,7) ) ,12) ) ,4,6) ,4) ) +transpose(((arpeggio(arpeggio(shuffle((X+transpose(X,7) ) ) ) ) +transpose((step(transpose(X,-7) ,12) |(shuffle(arpeggio(arpeggio((X+transpose(X,7) ) ) ) ) +transpose(arpeggio(arpeggio(X) ) ,12) ) ) ,4) ) +transpose(transpose(echo(transpose((X+X) ,-7) ,4,6) ,4) ,7) ) ,7) ) ,12) ,-7) +transpose((shuffle((((transpose(step(X,12) ,-7) |shuffle(X) ) +transpose(echo(((X+transpose(X,7) ) +X) ,4,6) ,12) ) +transpose(transpose(shuffle(X) ,-5) ,12) ) ) +transpose(transpose(transpose((transpose(step(echo(transpose(transpose(X,4) ,4) ,4,6) ,12) ,4) |step(((shuffle(transpose(X,4) ) +transpose((arpeggio(X) |(X+X) ) ,12) ) +arpeggio((X+X) ) ) ,12) ) ,4) ,4) ,-7) ) ,12) ) ,12) |shuffle(arpeggio(((((((arpeggio(echo(shuffle(X) ,4,6) ) +transpose(step(transpose(transpose(((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ,-5) ,-7) ,12) ,4) ) +transpose(step(transpose((arpeggio(shuffle(transpose(X,4) ) ) +transpose(transpose(transpose(X,4) ,4) ,-5) ) ,4) ,12) ,7) ) +transpose(echo(transpose(transpose(shuffle((X+transpose((X+X) ,7) ) ) ,-5) ,-5) ,4,6) ,7) ) +transpose(echo(transpose(((((echo(transpose(transpose(X,4) ,4) ,4,6) |transpose((X+transpose((X|X) ,12) ) ,-5) ) +(((shuffle((transpose(X,-7) +step(X,12) ) ) +(X|X) ) +transpose(echo(X,4,6) ,4) ) +transpose((step(X,12) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) +transpose(transpose(transpose((transpose(X,4) +transpose(transpose(X,-5) ,12) ) ,-7) ,-7) ,4) ) +transpose(((step((X|echo(X,4,6) ) ,12) +(arpeggio(X) +transpose(X,12) ) ) +transpose(transpose((X|X) ,-5) ,12) ) ,7) ) ,4) ,4,6) ,12) ) |((transpose((transpose(step(transpose(X,4) ,12) ,-5) +transpose(((transpose(X,4) +transpose(step(X,12) ,7) ) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,-5) +transpose((step(arpeggio((step((X+X) ,12) +transpose(step(shuffle(X) ,12) ,7) ) ) ,12) |transpose(transpose(transpose(X,4) ,4) ,-7) ) ,4) ) +transpose(echo((((((transpose(((X|X) +X) ,-7) +transpose(transpose(X,-5) ,4) ) +transpose((shuffle((X|X) ) |(transpose(X,4) +(X|X) ) ) ,7) ) |transpose((X+transpose(X,7) ) ,4) ) +(((X+transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose((X|(X+X) ) ,7) ) +transpose(((X+transpose(X,12) ) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,7) ) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,-5) ) ,4,6) ,7) ) ) |transpose((((transpose(transpose(shuffle((echo(X,4,6) +transpose(transpose(X,-5) ,7) ) ) ,4) ,-7) +(X+transpose((shuffle(X) +transpose(step(X,12) ,12) ) ,12) ) ) +transpose(transpose(echo(step((arpeggio(transpose(X,4) ) |(((X|X) +transpose(X,7) ) +transpose(X,12) ) ) ,12) ,4,6) ,4) ,4) ) +transpose(transpose((((X|X) |(X+transpose(X,12) ) ) +((X|X) |step(transpose(X,-7) ,12) ) ) ,-7) ,7) ) ,4) ) ) ) ) ,-7) ) random seed used was 230126500

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