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: transpose((echo(((echo(step((echo(((arpeggio(transpose((X|X) ,4) ) +transpose(((echo(arpeggio(X) ,4,6) |(X|X) ) +transpose(transpose(echo((X|X) ,4,6) ,-7) ,12) ) ,12) ) +transpose(shuffle(X) ,7) ) ,4,6) |arpeggio(transpose((transpose(shuffle(arpeggio(shuffle(X) ) ) ,-7) +(arpeggio(transpose(shuffle(shuffle(shuffle(X) ) ) ,-7) ) +transpose(shuffle(arpeggio(transpose(transpose((shuffle(X) +(X+transpose(X,12) ) ) ,-5) ,-7) ) ) ,12) ) ) ,-7) ) ) ,12) ,4,6) +(((arpeggio(transpose(arpeggio((shuffle(transpose((arpeggio((step((X+transpose(X,12) ) ,12) |(transpose(echo(X,4,6) ,4) +transpose(transpose(X,-5) ,7) ) ) ) +transpose(arpeggio((step(((X|X) |X) ,12) |transpose(transpose(X,-5) ,-7) ) ) ,7) ) ,-7) ) |arpeggio(arpeggio(transpose((transpose((X+transpose(X,12) ) ,4) +transpose(transpose(X,-7) ,7) ) ,-7) ) ) ) ) ,4) ) +transpose(((echo(shuffle((arpeggio(arpeggio(transpose(transpose(X,-5) ,4) ) ) +((((X|X) +transpose(transpose(X,-7) ,12) ) |((X+transpose(X,4) ) +transpose((arpeggio(X) +transpose(transpose(X,4) ,12) ) ,7) ) ) +transpose((X|X) ,12) ) ) ) ,4,6) +transpose(((echo(echo((step((step(X,12) |X) ,12) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ,4,6) ,4,6) +(transpose(shuffle(X) ,-5) +transpose((step((transpose(((transpose(X,-5) +transpose(transpose((X+X) ,4) ,7) ) +(transpose(X,4) +transpose(shuffle(X) ,7) ) ) ,-5) +transpose(transpose(step(X,12) ,4) ,7) ) ,12) +shuffle(X) ) ,7) ) ) |((shuffle(((transpose(arpeggio(X) ,-7) +arpeggio((X+X) ) ) +((transpose(X,4) +transpose((X+X) ,12) ) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ) ) +transpose(arpeggio(((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) +(shuffle(shuffle(transpose(X,-7) ) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ) ) ,4) ) +transpose(((((arpeggio((X+X) ) +arpeggio(arpeggio(transpose(X,-7) ) ) ) |transpose((X+transpose(transpose(X,4) ,12) ) ,4) ) +((arpeggio(shuffle(X) ) |(X|X) ) +(arpeggio((X+transpose(X,12) ) ) +(((X+transpose(X,7) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) ) ) +(shuffle(arpeggio(X) ) +transpose(transpose(((transpose((X+transpose(X,12) ) ,-5) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,-5) ,12) ) ) ,7) ) ) ,7) ) +arpeggio(((((((((transpose(transpose(X,4) ,-7) +transpose(arpeggio(X) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(arpeggio((arpeggio((X+transpose(X,12) ) ) +transpose((X+transpose(step(X,12) ,12) ) ,7) ) ) ,12) ) +transpose((((transpose(shuffle(X) ,-5) |((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) |X) ) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) |(transpose(transpose(transpose(arpeggio(X) ,-5) ,-5) ,-7) |transpose(((arpeggio(X) |transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,-7) ) ) +transpose(X,7) ) +transpose(step(step(arpeggio(arpeggio(transpose(X,4) ) ) ,12) ,12) ,4) ) +transpose(arpeggio(transpose((transpose((X|X) ,4) +transpose((X|X) ,7) ) ,-5) ) ,7) ) ) ) ,4) ) +transpose((((((shuffle(transpose(transpose((step(X,12) |transpose(X,-5) ) ,-5) ,-5) ) +transpose((transpose((X+transpose(X,12) ) ,-5) |(arpeggio((((X|(X+transpose(X,12) ) ) +transpose(((X|X) +X) ,4) ) +transpose(X,7) ) ) |echo((((transpose(X,4) +X) +arpeggio(shuffle(X) ) ) +transpose(transpose(X,4) ,12) ) ,4,6) ) ) ,7) ) +transpose(arpeggio((((transpose((transpose(transpose(X,4) ,-5) |(X+transpose((X|X) ,7) ) ) ,4) |(transpose(X,4) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ,12) ) ) +transpose((transpose((X|X) ,-5) +(((X+(X+transpose(X,12) ) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,12) ) +transpose(((transpose((X+X) ,-7) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose((shuffle(transpose(X,4) ) +transpose(arpeggio(X) ,12) ) ,7) ) ,-5) ) ) ,4) ) +transpose(step(((arpeggio(shuffle(shuffle(transpose((X+transpose(X,7) ) ,-7) ) ) ) +transpose(arpeggio(X) ,4) ) +transpose(((transpose(X,-5) |shuffle((X|X) ) ) +transpose(arpeggio(X) ,-7) ) ,7) ) ,12) ,7) ) |transpose((step(transpose(((transpose((X+X) ,-7) +transpose((X+transpose(X,7) ) ,4) ) |echo(echo(arpeggio(X) ,4,6) ,4,6) ) ,-7) ,12) |(transpose(transpose(transpose(X,4) ,-7) ,-7) +transpose((arpeggio(transpose(X,-7) ) |shuffle(shuffle(X) ) ) ,12) ) ) ,4) ) +transpose((shuffle((step(arpeggio(X) ,12) |shuffle(step((transpose(X,-7) |transpose(X,-5) ) ,12) ) ) ) +transpose(arpeggio((echo(((transpose(transpose(X,-5) ,-5) +transpose((transpose(X,-5) +(step(X,12) +transpose(transpose(X,-5) ,12) ) ) ,4) ) +transpose(transpose((X+transpose(transpose(X,-7) ,12) ) ,-7) ,7) ) ,4,6) +transpose(transpose(((arpeggio(X) +transpose(shuffle(transpose(X,-5) ) ,12) ) +transpose(shuffle(transpose(shuffle(X) ,4) ) ,7) ) ,4) ,-5) ) ) ,-7) ) ,7) ) ,7) ) +transpose(((((transpose((X+X) ,4) +(step(X,12) |transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ) ) +shuffle(transpose(arpeggio(X) ,4) ) ) +transpose(((transpose(((X|X) +step(step(X,12) ,12) ) ,-7) +(((X+transpose(X,12) ) +transpose(X,12) ) +transpose(transpose(transpose((X|X) ,4) ,-5) ,7) ) ) |(transpose(arpeggio(arpeggio(X) ) ,-5) |(arpeggio(X) |(X+transpose(transpose(echo(X,4,6) ,4) ,12) ) ) ) ) ,7) ) +transpose(transpose((echo(step(X,12) ,4,6) +transpose((arpeggio(echo(arpeggio(((X+X) |X) ) ,4,6) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,4) ,12) ) ,12) ) ) +(step(transpose(arpeggio(echo(transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,-5) ,4,6) ) ,-7) ,12) |transpose(transpose(((shuffle(transpose((echo(((((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((transpose(X,4) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,4,6) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose((arpeggio(step((X|X) ,12) ) +transpose(step(transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,-7) ) ,-5) ,12) ,12) ) ,4) ) +transpose(step(((transpose(echo(X,4,6) ,-7) |arpeggio(((X+transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ) ) |(step(X,12) +(echo(X,4,6) +transpose(transpose(X,4) ,12) ) ) ) ,12) ,7) ) ,-7) ,-7) ) ) ,4,6) +transpose(transpose(((transpose(((((((arpeggio(X) |transpose(X,4) ) +X) +transpose(transpose(shuffle(shuffle(X) ) ,4) ,4) ) +transpose(transpose((arpeggio(X) +transpose(X,12) ) ,-7) ,7) ) +transpose(((((shuffle(X) +transpose(X,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) +transpose(shuffle(step(X,12) ) ,4) ) +transpose((X+arpeggio(transpose(X,4) ) ) ,7) ) ,7) ) +transpose(shuffle(((((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(X,4) ,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,12) ) ,7) ) ) ,4) ) ,-5) +transpose((((arpeggio(shuffle((transpose(transpose(X,-5) ,4) +transpose(((X|X) +transpose(transpose(X,4) ,12) ) ,7) ) ) ) +(((transpose(echo(arpeggio(X) ,4,6) ,-7) |transpose(X,-5) ) +transpose(arpeggio((X+X) ) ,12) ) +(((echo((((X+X) +transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(((X+X) +transpose(X,7) ) ,-5) ,12) ) ) ) +step(transpose(X,4) ,12) ) +(echo(transpose(X,-5) ,4,6) +transpose(step(transpose(arpeggio(transpose((X|(X+transpose(transpose(X,-7) ,7) ) ) ,4) ) ,-7) ,12) ,7) ) ) ,4) ) +transpose(transpose((X+transpose(arpeggio(((((X+X) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) |transpose(X,-5) ) ) ,12) ) ,-5) ,7) ) ,-7) ,7) ) ,-7) random seed used was 211712592

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