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(((((transpose((echo((X|X) ,4,6) |(((arpeggio(((X|X) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ) +transpose(((transpose(X,-5) +transpose(((X+X) +transpose(X,12) ) ,12) ) |((X+transpose(X,-5) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) ) ,7) ) |arpeggio(transpose((transpose(X,4) +(X+transpose(X,7) ) ) ,-7) ) ) |shuffle(((transpose(X,4) +transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) ) ) ) ,-7) +(echo((transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-5) ,-5) +transpose(shuffle((shuffle(((X+shuffle(X) ) +transpose(arpeggio((X+transpose(transpose(X,4) ,12) ) ) ,12) ) ) +step(arpeggio(X) ,12) ) ) ,12) ) ,4,6) +transpose(transpose(((arpeggio(step(X,12) ) +transpose(step((transpose(echo(X,4,6) ,-7) +transpose(transpose((step(X,12) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ,7) ) ,12) ,12) ) |step(step(transpose(X,-5) ,12) ,12) ) ,-7) ,4) ) ) +((transpose((transpose(step(step(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(X,7) ) +transpose((transpose(transpose((X+transpose(X,7) ) ,4) ,-7) |(X+transpose(X,-7) ) ) ,4) ) +transpose((X+transpose(X,4) ) ,7) ) ,12) ,12) ,-7) +arpeggio(((((echo(transpose(transpose(transpose(X,-7) ,-5) ,-7) ,4,6) +step(transpose(X,-7) ,12) ) +transpose((transpose((X+((X|X) +transpose(((X|X) +(X+transpose(X,12) ) ) ,7) ) ) ,-5) +transpose(transpose(arpeggio(X) ,-7) ,12) ) ,7) ) +transpose(transpose(transpose(shuffle(X) ,4) ,-7) ,4) ) +transpose(echo(arpeggio(echo((X+X) ,4,6) ) ,4,6) ,7) ) ) ) ,4) +transpose(shuffle(((((arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,7) ) ) +transpose((((X+transpose((X|X) ,4) ) +transpose(X,7) ) |((((X|X) +transpose((transpose(X,4) +transpose(shuffle(X) ,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) |echo(step(X,12) ,4,6) ) ) ,-5) ) +transpose(transpose((((transpose(shuffle(((X+transpose(X,7) ) +step(transpose(X,4) ,12) ) ) ,4) +step(transpose(transpose(X,-7) ,-7) ,12) ) +transpose(((transpose((transpose(X,-7) +((X+transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) ) ,-5) +transpose(((transpose(((X|transpose(X,-7) ) +transpose((shuffle(X) +(X+X) ) ,7) ) ,4) +transpose((transpose((X+X) ,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(shuffle(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) ,7) ) ,4) ) +transpose(transpose(transpose(echo(step(X,12) ,4,6) ,-5) ,-7) ,7) ) ,4) ,4) ) +transpose((transpose(transpose(transpose(arpeggio((arpeggio(transpose(X,4) ) +(transpose((X+X) ,-7) +transpose((transpose(X,-5) +transpose(X,12) ) ,7) ) ) ) ,-5) ,-7) ,4) |(((transpose(X,-7) +echo((X|X) ,4,6) ) |((arpeggio(X) +transpose(X,12) ) +transpose(echo(X,4,6) ,12) ) ) +transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose((X|transpose(X,4) ) ,4) ) +transpose(X,7) ) ,-7) ) ) ,7) ) +(echo(transpose(step(shuffle((X|X) ) ,12) ,-5) ,4,6) +transpose(transpose(transpose((transpose((X+transpose(X,7) ) ,4) +(transpose(X,4) |X) ) ,4) ,-5) ,4) ) ) ) ,12) ) +transpose((transpose(arpeggio(echo(echo((transpose(((X+X) +transpose((X+X) ,12) ) ,-7) +transpose(((X+(X+transpose(X,12) ) ) +transpose(X,12) ) ,12) ) ,4,6) ,4,6) ) ,4) |transpose(((transpose(transpose(transpose((((((transpose((X+transpose(X,7) ) ,-7) +transpose(((X+X) +(X+X) ) ,7) ) |(X+transpose(X,7) ) ) +transpose(((((X|X) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) |step(X,12) ) ,4) ) +transpose(((arpeggio(transpose(X,-5) ) |(X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((((((X|X) +X) +transpose((X|X) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,7) ) ,4) ) +transpose(transpose((step(X,12) |transpose(X,-7) ) ,-7) ,7) ) ,-7) ,4) ,-7) +transpose(transpose(shuffle(transpose(echo(shuffle((X+X) ) ,4,6) ,4) ) ,4) ,4) ) +transpose(arpeggio((((((((X+transpose(X,12) ) +arpeggio(transpose(X,4) ) ) +(step(X,12) +echo(X,4,6) ) ) +transpose((arpeggio(X) +transpose((((X+X) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,12) ) |(transpose(transpose(shuffle((X+X) ) ,-5) ,-5) +((transpose((transpose((X+X) ,4) +transpose(transpose(X,4) ,7) ) ,4) +transpose((((((X+transpose(X,12) ) +step(X,12) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose((echo(X,4,6) |(X+X) ) ,4) ,7) ) ,4) ) +transpose((arpeggio(X) |step(shuffle(X) ,12) ) ,7) ) ) ) +transpose(((step((X|X) ,12) +transpose((echo(transpose(X,4) ,4,6) +transpose(arpeggio(shuffle(X) ) ,-5) ) ,7) ) +transpose(((transpose(X,4) +transpose(X,7) ) |X) ,12) ) ,7) ) |((arpeggio((X+transpose(X,7) ) ) +transpose(((transpose(X,-7) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,12) ) +(transpose(transpose(X,4) ,4) |transpose(X,4) ) ) ) ) ,7) ) ,-7) ) ,12) ) ) +transpose(transpose(step(transpose(transpose(step(transpose(transpose(((transpose(transpose(X,-5) ,-5) +transpose(transpose((step(X,12) +X) ,-5) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,-7) ,-7) ,12) ,4) ,-7) ,12) ,-7) ,12) ) +transpose(echo((transpose(transpose(step((transpose(((((transpose(((X|X) +transpose((X|X) ,7) ) ,-5) |(((shuffle(X) |(X+transpose(X,12) ) ) +step(transpose(X,-7) ,12) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) |(transpose(((transpose(X,-5) +((X|X) +transpose(X,-7) ) ) +transpose(((X|X) +transpose(X,4) ) ,12) ) ,-5) +transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,-7) ) ) +transpose((((((shuffle((X+transpose(X,12) ) ) +transpose(transpose(shuffle(echo(X,4,6) ) ,-5) ,4) ) +transpose((transpose(arpeggio(echo(X,4,6) ) ,4) |((X|X) |X) ) ,7) ) |((transpose(X,-5) +transpose((step(X,12) +transpose((X+X) ,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) +transpose(((echo(transpose(X,-7) ,4,6) +transpose((arpeggio(X) |transpose(X,-7) ) ,7) ) +transpose(transpose((transpose(X,4) +step(X,12) ) ,4) ,7) ) ,7) ) +transpose(arpeggio((transpose((shuffle(transpose(X,4) ) +(X+echo(X,4,6) ) ) ,-5) |((transpose(transpose(X,-7) ,4) +transpose(echo(shuffle(X) ,4,6) ,12) ) |((X|X) +transpose(transpose(arpeggio(X) ,4) ,7) ) ) ) ) ,7) ) ,4) ) +transpose(transpose(((((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose((X+transpose(shuffle(X) ,12) ) ,7) ) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ,12) ) |(X+transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ) +transpose(transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,-5) ,-5) ) ,-5) ,7) ) ,-5) |(echo((((X+transpose(shuffle(X) ,12) ) |transpose(X,-7) ) +(transpose((X+transpose(X,7) ) ,-5) +transpose(step(X,12) ,4) ) ) ,4,6) |transpose((transpose(X,-7) +transpose(((transpose((transpose(X,-7) +transpose(X,12) ) ,4) |transpose(X,4) ) +transpose((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,-5) ) ,12) ) ,4) ) ) ,12) ,-7) ,-5) |echo((((transpose(transpose((((X|X) +transpose(X,-5) ) +((transpose(X,4) +(X+X) ) +transpose(arpeggio((X|X) ) ,12) ) ) ,-5) ,-5) +transpose(step((shuffle((transpose(X,-5) +transpose((X|X) ,12) ) ) |((step(X,12) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose(transpose((step(X,12) +X) ,-7) ,7) ) ) ,12) ,7) ) +transpose(shuffle(echo(transpose((((((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) +transpose((X+X) ,4) ) +transpose(((X+X) +transpose(X,-5) ) ,7) ) +transpose(transpose(step(X,12) ,-5) ,4) ) +transpose(transpose(transpose((X+X) ,4) ,-7) ,7) ) ,4) ,4,6) ) ,4) ) +transpose(((transpose(step((transpose(echo(transpose(transpose(X,-5) ,-7) ,4,6) ,-7) +transpose((((X+transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) +X) ,12) ) ,12) ,4) +transpose((transpose(transpose((((transpose(X,-7) +transpose((X+echo((X+transpose(X,12) ) ,4,6) ) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(((transpose(X,-5) +transpose(echo(X,4,6) ,12) ) +transpose((((X+X) +transpose(transpose(X,4) ,12) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,12) ) ,12) ) ,7) ) ,-5) ,-7) +((echo(transpose(((X|X) |(X+transpose(X,7) ) ) ,-5) ,4,6) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(step((transpose(X,-5) +transpose(X,12) ) ,12) ,7) ) ) ,12) ) +transpose(transpose(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((X|(X+X) ) ,7) ) ,4) ,-5) ,12) ) ,12) ) ,4,6) ) ,4,6) ,7) ) ,4,6) random seed used was 239084812

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