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: shuffle(((arpeggio(echo(transpose(echo((arpeggio(echo((X+transpose((X+transpose(X,7) ) ,4) ) ,4,6) ) +echo(shuffle((transpose(X,-5) +transpose(((X|X) |X) ,12) ) ) ,4,6) ) ,4,6) ,-5) ,4,6) ) |(((transpose(transpose(echo(((X+X) +((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) ,4,6) ,-5) ,-7) +transpose((transpose(shuffle((shuffle(X) |transpose(transpose(step(X,12) ,-5) ,-5) ) ) ,4) |(((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(arpeggio((step(X,12) +transpose((X+transpose(step(X,12) ,12) ) ,12) ) ) ,12) ) ) ,4) ) +transpose(((echo(echo(transpose(X,-7) ,4,6) ,4,6) |transpose(((shuffle(X) |((((X|X) +X) +transpose(X,4) ) +transpose(transpose((X+echo(X,4,6) ) ,-5) ,7) ) ) +(transpose((transpose(transpose(X,-7) ,4) |(X+transpose(X,12) ) ) ,-5) +transpose(transpose((transpose(transpose(X,-5) ,-7) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ,7) ) ) ,-7) ) |step(transpose((transpose(X,4) +transpose(step(X,12) ,12) ) ,4) ,12) ) ,12) ) +(echo(transpose(transpose(transpose(transpose(transpose(transpose((transpose(transpose(X,4) ,-5) |transpose(X,-5) ) ,4) ,-5) ,4) ,4) ,4) ,-7) ,4,6) +transpose(((step(((shuffle(transpose((transpose(X,-5) +transpose((X|X) ,7) ) ,-5) ) |transpose(((X+X) +transpose((X|X) ,4) ) ,4) ) +transpose(transpose(echo(((arpeggio(X) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ,-5) ,12) ) ,12) +transpose(((transpose(((transpose(shuffle((X|X) ) ,-7) +transpose((((X|X) +(X+transpose(X,7) ) ) +(transpose(X,-5) +transpose(shuffle(X) ,7) ) ) ,4) ) +transpose(transpose((shuffle(X) +transpose(transpose(X,-5) ,7) ) ,-5) ,7) ) ,-5) +(transpose((X|transpose(X,4) ) ,4) +((transpose(transpose(transpose(X,4) ,4) ,4) +(X+((X|X) +X) ) ) +transpose(((X|transpose(X,-7) ) |(X+transpose(X,7) ) ) ,-5) ) ) ) +transpose(((((((X+step(X,12) ) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose(((X+X) +(X+transpose(X,7) ) ) ,7) ) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +(transpose(X,-7) +transpose(transpose((X+X) ,-7) ,12) ) ) +transpose(transpose((((X+transpose(X,12) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose((transpose(X,-5) +transpose((X+X) ,12) ) ,7) ) ,4) ,-7) ) ,-7) ) ,7) ) |((((((X+transpose(X,4) ) +transpose((X+X) ,7) ) +X) +transpose(transpose(X,4) ,12) ) +(((transpose(X,4) +(X+X) ) +transpose(((((X+transpose(X,7) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) ,4) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,7) ) ) |(transpose(transpose(arpeggio((step(arpeggio(X) ,12) |(X+(X+transpose(X,12) ) ) ) ) ,4) ,-5) +transpose((((transpose((((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(echo(X,4,6) ,7) ) ,-7) |(((((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) +transpose(step((X+transpose(X,7) ) ,12) ,12) ) +transpose(transpose(((X+(X|X) ) +echo(transpose(X,4) ,4,6) ) ,4) ,4) ) +transpose(shuffle(arpeggio(arpeggio(X) ) ) ,7) ) ) |((step((transpose(X,-5) |(X+transpose(X,7) ) ) ,12) +transpose(transpose(((((X+transpose(X,7) ) |X) +transpose(arpeggio(X) ,12) ) +arpeggio(transpose(X,4) ) ) ,-5) ,4) ) +transpose(((X|X) +transpose(X,7) ) ,7) ) ) |step((echo(shuffle((transpose((X+transpose(X,7) ) ,-7) +transpose(transpose(X,-5) ,12) ) ) ,4,6) +transpose(((X+transpose(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,12) ) ,12) ) ) ) ,7) ) ) ) |transpose((((transpose(shuffle(step(((step(((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,12) +transpose((X+transpose(transpose(arpeggio(X) ,4) ,12) ) ,4) ) +transpose(step(arpeggio(X) ,12) ,7) ) ,12) ) ,-7) +transpose(transpose(transpose(((transpose((transpose(transpose((X+X) ,-7) ,-7) |((shuffle(transpose(X,-5) ) +transpose((X+transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,-7) |(((transpose(echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) ,4) +transpose(((shuffle(transpose(X,-7) ) |transpose(transpose(X,-5) ,-7) ) +(shuffle(X) +shuffle(X) ) ) ,4) ) +transpose((((X+transpose(X,7) ) +X) |((X+X) +X) ) ,7) ) |transpose(transpose(transpose(X,4) ,-5) ,-5) ) ) |((((transpose(X,-7) +transpose(shuffle(X) ,12) ) |(shuffle(shuffle((X|X) ) ) +transpose(transpose(X,4) ,7) ) ) +transpose(transpose((echo(step((X+transpose(X,12) ) ,12) ,4,6) +shuffle(transpose(X,4) ) ) ,4) ,4) ) +transpose(transpose(echo((((X+transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,4,6) ,-7) ,7) ) ) ,-7) ,4) ,7) ) +transpose(transpose((transpose((step(transpose(shuffle((transpose(X,-5) |X) ) ,4) ,12) +transpose(transpose(transpose((((transpose(arpeggio(X) ,-5) +transpose((((X+transpose(X,7) ) +transpose(transpose((X+X) ,-5) ,4) ) +transpose((X|X) ,7) ) ,7) ) +transpose(((X+X) |echo(X,4,6) ) ,12) ) |arpeggio((X+(X+transpose(X,7) ) ) ) ) ,4) ,-7) ,7) ) ,4) +(((((transpose((X|X) ,-5) +transpose(step(transpose((X+transpose(X,7) ) ,4) ,12) ,12) ) +transpose(transpose(X,-5) ,12) ) |step(X,12) ) +(((((X+X) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(arpeggio(transpose(transpose(transpose(X,-7) ,4) ,4) ) ,7) ) ) +transpose(arpeggio(transpose(transpose(transpose(X,-7) ,-5) ,-5) ) ,12) ) ) ,-7) ,4) ) +transpose(((((transpose((echo(transpose(transpose(echo(X,4,6) ,-5) ,4) ,4,6) |transpose(shuffle(transpose(X,-5) ) ,-5) ) ,-5) +transpose(transpose((step((((step(X,12) +transpose((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose((X+X) ,7) ) +(X|(X+transpose((X|X) ,7) ) ) ) ,12) +transpose(((((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) +transpose((transpose(transpose(X,4) ,4) +transpose((echo(X,4,6) +transpose((transpose(shuffle(X) ,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,12) ) ,7) ) ,7) ) ,-7) ,7) ) +transpose((transpose(transpose(shuffle((arpeggio(step(X,12) ) |((((echo(echo(X,4,6) ,4,6) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |(X+X) ) ,4) ) +transpose((transpose(X,-5) |(X+transpose(X,7) ) ) ,7) ) ) ) ,-5) ,-5) |(((transpose(echo(((X+transpose(X,12) ) +transpose((X+X) ,12) ) ,4,6) ,-7) +transpose(step(step((transpose(echo(X,4,6) ,-5) +(X+transpose(X,12) ) ) ,12) ,12) ,12) ) +transpose(transpose((step((transpose((X+transpose(X,12) ) ,-7) |(transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) ) ,12) +(((((transpose(X,-5) +transpose(step(X,12) ,12) ) |(((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(transpose((transpose(X,-5) +transpose((X+X) ,12) ) ,-5) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) +transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,12) ) ) ,4) ,4) ) +transpose(echo((transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4) |(X+transpose(X,12) ) ) ,4,6) ,7) ) ) ,4) ) +transpose((transpose((step(transpose((((transpose(X,-7) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((((X+X) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,4) ,12) |echo(arpeggio(X) ,4,6) ) ,4) +echo(shuffle(transpose(step(transpose(transpose((X+X) ,-7) ,-5) ,12) ,4) ) ,4,6) ) ,7) ) |step(transpose((transpose(shuffle(transpose(((((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) +X) +((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) ,4) ) ,4) +transpose((transpose(step(echo(((X|X) +transpose(X,-5) ) ,4,6) ,12) ,4) +transpose((transpose(((X+X) |(X+X) ) ,-5) +transpose((X|X) ,7) ) ,-5) ) ,12) ) ,-7) ,12) ) ,7) ) ,4) ) ) random seed used was 165138560

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