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: arpeggio(arpeggio((shuffle((((transpose(((echo((arpeggio(transpose((((((X+X) +echo(X,4,6) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) +transpose(shuffle(X) ,4) ) +transpose((((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose(X,7) ) |transpose(echo(X,4,6) ,4) ) ,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,12) ) ,4,6) |((((transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +(X|X) ) ,4) +transpose((step(transpose(X,-5) ,12) +transpose((step(X,12) +transpose(transpose(X,4) ,12) ) ,12) ) ,7) ) |(((transpose(step(X,12) ,-7) +(transpose(X,-7) +transpose(transpose(X,-5) ,7) ) ) +transpose(((transpose(X,-5) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,7) ) +transpose(arpeggio(((X+transpose(X,7) ) +(transpose(X,-7) |shuffle(X) ) ) ) ,7) ) ) +transpose(transpose((((X+transpose(X,12) ) |transpose((transpose(X,4) |transpose(X,4) ) ,-7) ) |(transpose((X+transpose(X,7) ) ,-5) +transpose((((X+X) +transpose(X,12) ) |X) ,12) ) ) ,-5) ,4) ) +transpose(((step((X+transpose((transpose(X,4) +transpose(echo(X,4,6) ,12) ) ,7) ) ,12) |arpeggio(((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +(echo(X,4,6) +transpose(step(X,12) ,7) ) ) ) ) +transpose(transpose(X,-5) ,4) ) ,7) ) ) |transpose(step(transpose(transpose(step((X+X) ,12) ,-5) ,4) ,12) ,4) ) ,-5) +transpose(transpose((transpose(((transpose(transpose(shuffle(transpose((X+transpose(X,7) ) ,-5) ) ,4) ,-5) +transpose(((transpose(step(((shuffle(echo(transpose(X,4) ,4,6) ) +transpose(transpose(X,-7) ,4) ) +transpose((((X+X) +transpose((X+transpose((X+X) ,12) ) ,12) ) |echo(X,4,6) ) ,7) ) ,12) ,-7) +transpose((((((transpose(X,-5) +((X|X) |(X+X) ) ) |((X|X) |X) ) +(arpeggio((shuffle(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) +(X|echo(X,4,6) ) ) ) +(shuffle(shuffle(X) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) |transpose(step(transpose(X,-7) ,12) ,4) ) ,4) ) +transpose(((transpose((transpose((X+X) ,-5) |transpose(X,4) ) ,4) +transpose(transpose(transpose(X,4) ,4) ,-7) ) +echo(((arpeggio(X) +transpose(X,-5) ) |shuffle(X) ) ,4,6) ) ,7) ) ,4) ) +transpose(step((((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) +transpose(transpose(X,-5) ,4) ) +transpose(shuffle((X|X) ) ,7) ) |step((X|X) ,12) ) ,12) ,7) ) ,-7) |((((echo(echo(((step(X,12) +transpose((X+transpose(X,12) ) ,-5) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,4,6) ,4,6) +(echo((((transpose((X+X) ,-7) |transpose(X,4) ) +transpose(((transpose(transpose(X,-5) ,-7) +transpose((transpose(X,-7) |X) ,4) ) +transpose((echo(X,4,6) +transpose((X+X) ,12) ) ,7) ) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) ,4,6) +transpose(arpeggio(shuffle(X) ) ,12) ) ) +transpose((transpose(step(arpeggio(arpeggio(X) ) ,12) ,-7) +transpose(((X+(X+transpose(X,7) ) ) +X) ,-7) ) ,12) ) +transpose((((((X+transpose(X,12) ) +transpose(step(X,12) ,7) ) +transpose((transpose(X,4) |X) ,4) ) +transpose(((X+(X|X) ) |transpose(X,4) ) ,7) ) +transpose(echo(((X|X) +transpose(echo(X,4,6) ,-7) ) ,4,6) ,12) ) ,12) ) |(((arpeggio(echo(X,4,6) ) +transpose(arpeggio(transpose(X,-7) ) ,4) ) +transpose(arpeggio(step((X+transpose(X,7) ) ,12) ) ,7) ) +shuffle(X) ) ) ) ,4) ,4) ) +transpose(transpose(transpose((step(transpose(transpose((echo(X,4,6) |transpose((X+transpose(X,-7) ) ,-5) ) ,-7) ,-7) ,12) |transpose(shuffle((transpose(arpeggio((X+X) ) ,4) +((((transpose(transpose(X,-5) ,4) +transpose(transpose(X,-7) ,4) ) +transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(echo(transpose(((X|X) |(X+X) ) ,-7) ,4,6) ) ,7) ) ) ) ,-7) ) ,-5) ,-7) ,7) ) +((transpose(((((X+transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,12) ) +((transpose((X+transpose(X,7) ) ,4) +transpose(transpose(X,-5) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ) |echo((transpose(((arpeggio(X) |transpose((X|X) ,-7) ) +transpose(echo((X+X) ,4,6) ,12) ) ,-7) |(transpose(step((transpose(X,-5) |(X|X) ) ,12) ,4) +transpose((step(X,12) +shuffle((X|X) ) ) ,12) ) ) ,4,6) ) +transpose(arpeggio(transpose(shuffle((shuffle(shuffle(((X+X) +(X+transpose(X,7) ) ) ) ) +transpose((shuffle(X) +transpose(arpeggio(((X+X) +shuffle(X) ) ) ,12) ) ,12) ) ) ,4) ) ,7) ) ,-7) |transpose(transpose((((echo(X,4,6) +transpose((transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,12) ) |step((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,12) ) ,-7) ,-7) |step(transpose(X,-7) ,12) ) ,4) ) +transpose((arpeggio((transpose(X,-5) |transpose(((X+X) |(X+transpose(transpose(X,-7) ,7) ) ) ,4) ) ) |(step(arpeggio((transpose(X,-5) |(X|X) ) ) ,12) +transpose((((transpose(X,-7) |(X|X) ) +transpose(transpose(X,4) ,12) ) +transpose(transpose(X,-7) ,12) ) ,7) ) ) ,7) ) +transpose((shuffle(transpose(transpose(X,-7) ,-5) ) +((X|step(X,12) ) +step(shuffle((X+X) ) ,12) ) ) ,7) ) ,-5) ,-5) ) |shuffle(arpeggio(transpose((((transpose(step(X,12) ,-7) |transpose((X|X) ,-7) ) |step((X|X) ,12) ) +transpose((step((X+transpose(X,7) ) ,12) +transpose(step(X,12) ,4) ) ,7) ) ,-5) ) ) ) ) ) |step(((transpose(((transpose((((X+transpose(X,12) ) +transpose(((X+transpose(X,7) ) +transpose((X+X) ,7) ) ,4) ) +transpose((X+(X+X) ) ,7) ) ,-7) |(transpose(X,-5) +transpose((X+X) ,7) ) ) |(transpose(X,-5) +transpose((((transpose(X,4) +transpose(((X+X) +(X+X) ) ,7) ) |transpose((echo(X,4,6) +X) ,4) ) +(shuffle(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) ) ,4) +transpose((((transpose(arpeggio(echo(((transpose((X+transpose(X,12) ) ,4) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,4,6) ) ,-5) |transpose((step(transpose(transpose(transpose(X,4) ,4) ,-5) ,12) |arpeggio(transpose(((X|(X+X) ) +X) ,-5) ) ) ,-7) ) +transpose((((transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) +transpose((echo(transpose(((X+X) |transpose(X,-7) ) ,-7) ,4,6) +((X|X) +transpose(X,12) ) ) ,7) ) |((((transpose((X|X) ,-7) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) +transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,4) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) ) +shuffle(shuffle(echo((transpose(X,-5) +(((X+X) +transpose(transpose(X,-7) ,12) ) |(X+transpose(X,7) ) ) ) ,4,6) ) ) ) ,7) ) |transpose(transpose((transpose((X|transpose((X+transpose(X,7) ) ,4) ) ,4) +shuffle(echo((transpose(X,4) |(X+X) ) ,4,6) ) ) ,4) ,-5) ) ,4) ) +transpose(transpose((transpose(transpose(((shuffle((X+transpose(X,7) ) ) +transpose(X,7) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ,-7) ,-5) |(((step(arpeggio(echo(echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) ,4,6) ) ,12) +transpose((((transpose((X|X) ,-7) |(arpeggio((X+X) ) +step(shuffle(echo(X,4,6) ) ,12) ) ) +arpeggio(step(step(X,12) ,12) ) ) +transpose((((transpose(X,-5) |transpose(X,-5) ) +transpose(transpose((X+X) ,4) ,12) ) |((transpose(X,-5) |(X+X) ) +transpose(shuffle(transpose(step(X,12) ,-5) ) ,7) ) ) ,12) ) ,4) ) +transpose((transpose(((X+X) +transpose(step(((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) ,7) ) ,4) +transpose(((transpose(X,-7) +(step(X,12) |shuffle(transpose(X,4) ) ) ) +echo(X,4,6) ) ,7) ) ,7) ) +arpeggio(transpose((echo(((X+X) +transpose((X+X) ,7) ) ,4,6) +transpose(((X+X) |(X|X) ) ,7) ) ,-5) ) ) ) ,4) ,7) ) ,12) ) ) ) random seed used was 115264005

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