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

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