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((((transpose((((echo(((((shuffle(X) +transpose((((X+X) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) ,7) ) +((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) +transpose(transpose((transpose(X,-7) |X) ,-5) ,7) ) ,4,6) +transpose(((transpose(X,-5) +transpose(shuffle((X+transpose(X,12) ) ) ,12) ) +((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ) ,-7) ) +transpose(transpose(transpose(((transpose(X,4) +transpose((((X+transpose(arpeggio(X) ,7) ) +transpose((((X|X) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose(((transpose((X|X) ,-5) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,12) ) ,7) ) +transpose(transpose(X,-7) ,-5) ) ,4) ,-7) ,4) ) +transpose(transpose(transpose(transpose(transpose((shuffle(step((X+X) ,12) ) +transpose((transpose(X,-5) |transpose(step(X,12) ,-7) ) ,7) ) ,4) ,-5) ,-5) ,-7) ,7) ) ,-7) +transpose(transpose(shuffle((echo(arpeggio(((arpeggio(arpeggio(shuffle(X) ) ) +transpose((X|(transpose((X|X) ,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ) ,12) ) +transpose(echo(arpeggio(transpose(((transpose(X,4) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4) ) ,4,6) ,12) ) ) ,4,6) |(((((transpose((X|step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) +(transpose((X+transpose(X,7) ) ,-5) +transpose(transpose((X+X) ,4) ,12) ) ) |shuffle(arpeggio((transpose((transpose(X,-5) +transpose(X,12) ) ,-5) +transpose(transpose(((X+transpose(X,7) ) +step(X,12) ) ,-7) ,12) ) ) ) ) |transpose(echo(transpose(X,-7) ,4,6) ,-5) ) +transpose(transpose((transpose(((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) |step(transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ,-7) ,12) ) ,-5) ,4) ) +transpose(((((transpose(((X|X) +((X|X) +step(X,12) ) ) ,-5) +((X|X) +transpose((X+transpose(((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) +transpose((transpose((X+X) ,4) |(X|X) ) ,12) ) +transpose((((transpose(transpose((transpose(X,-5) +transpose((transpose(X,-5) +transpose(X,-5) ) ,7) ) ,4) ,4) +transpose(arpeggio(((transpose(transpose(X,-7) ,-5) +transpose(step(echo(X,4,6) ,12) ,12) ) +transpose((((transpose(X,4) +X) +transpose(arpeggio((X+X) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ) ,4) ) +transpose(((arpeggio(step(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) +transpose((shuffle((X+X) ) +(arpeggio(X) +transpose(X,7) ) ) ,4) ) +transpose(transpose(echo((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,4) ,7) ) ,7) ) +transpose(transpose(transpose(transpose(X,-5) ,4) ,-7) ,12) ) ,12) ) +transpose(((step(echo(((shuffle(X) +transpose((X|X) ,4) ) +transpose(X,7) ) ,4,6) ,12) +(transpose(shuffle(echo(X,4,6) ) ,4) +(step((arpeggio(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) |((echo(X,4,6) +arpeggio(X) ) +transpose((X+transpose(X,12) ) ,-5) ) ) ) ) |(echo(arpeggio(((X+transpose(X,7) ) +(X+X) ) ) ,4,6) +transpose((X+transpose(X,7) ) ,12) ) ) ,12) ) ,7) ) ) ) ,-5) ,4) ) +transpose(((transpose((echo(transpose((X|transpose(X,4) ) ,-7) ,4,6) +transpose((echo(X,4,6) +(transpose((X|X) ,4) +transpose(X,-7) ) ) ,-7) ) ,-5) +((transpose(((((X+transpose(((step(X,12) +transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ,12) ) +transpose(((X+transpose(((X|transpose(X,-5) ) +transpose(((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) ,12) ) +transpose((transpose(X,-5) +transpose((transpose(X,-5) |transpose(X,4) ) ,12) ) ,4) ) +transpose(transpose(transpose(transpose((transpose(X,-5) |X) ,4) ,-7) ,4) ,7) ) ,-5) +transpose(step(transpose((step((transpose(X,4) +transpose(X,7) ) ,12) |(X+transpose(transpose(X,4) ,12) ) ) ,-7) ,12) ,4) ) +transpose(shuffle(((X|((X+transpose(X,4) ) +transpose(X,7) ) ) |(arpeggio(X) +transpose((X+transpose(X,-7) ) ,7) ) ) ) ,7) ) ) |(((echo((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +((step(X,12) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ) |(step(step(X,12) ,12) +transpose((step(X,12) +((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ) ,12) ) ) ,4,6) +transpose(X,4) ) +echo((shuffle(transpose((X+transpose((X|X) ,12) ) ,-5) ) |transpose(((transpose((X+transpose(X,7) ) ,-7) +transpose(transpose(X,-5) ,4) ) +transpose((transpose(X,-5) +(X+transpose(X,12) ) ) ,7) ) ,4) ) ,4,6) ) +transpose(shuffle(((transpose(step(((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,12) ,-7) +transpose(shuffle(transpose(transpose(X,-7) ,4) ) ,4) ) +transpose(transpose(echo((((X|X) +transpose(transpose(echo(X,4,6) ,-5) ,12) ) +transpose(transpose(X,-7) ,-7) ) ,4,6) ,-7) ,7) ) ) ,12) ) ) ,7) ) +transpose(((transpose((shuffle(transpose(((((X+X) +transpose((X+transpose(X,12) ) ,12) ) +(((X|X) +transpose(transpose(transpose(shuffle(X) ,-5) ,-7) ,4) ) +transpose(step(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,12) ,7) ) ) +transpose(((echo(transpose(X,4) ,4,6) +transpose(((step(transpose(X,4) ,12) +transpose(X,12) ) |step(X,12) ) ,4) ) +transpose(shuffle((transpose(X,-5) |(X+X) ) ) ,7) ) ,-7) ) ,-7) ) |(((transpose(step((X|X) ,12) ,4) +echo(transpose((X|X) ,-5) ,4,6) ) +transpose(transpose(transpose(((X|X) |echo(X,4,6) ) ,-5) ,-7) ,4) ) +transpose((shuffle(((transpose(X,-7) +transpose((X|X) ,4) ) +transpose(X,7) ) ) +X) ,7) ) ) ,-5) +transpose((transpose(transpose((((arpeggio(arpeggio(X) ) +transpose((X+((shuffle(X) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) ,7) ) +transpose(((((shuffle((X+transpose(X,12) ) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) |((X|X) |((X+X) |transpose(X,-7) ) ) ) +transpose((shuffle(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,-7) +transpose(((((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ,-7) +transpose((X+transpose((X|X) ,7) ) ,-5) ) +transpose((((((X+echo(X,4,6) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +((X+X) +(X|X) ) ) +shuffle(transpose(X,-5) ) ) ,4) ) +transpose(transpose((X|X) ,-5) ,7) ) +transpose(((X+(X|X) ) +(transpose(echo(X,4,6) ,-7) +transpose(arpeggio(X) ,12) ) ) ,4) ) +transpose(((echo(transpose(X,4) ,4,6) +transpose(shuffle(transpose(echo(X,4,6) ,-5) ) ,12) ) |transpose(transpose((X+X) ,-7) ,-7) ) ,7) ) ,12) ) +transpose(transpose((transpose((X+X) ,4) +(X|(X+transpose(X,7) ) ) ) ,-5) ,7) ) |((transpose(shuffle((X|(X|X) ) ) ,-5) +transpose(step(((step(transpose(step(X,12) ,-7) ,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose((echo(X,4,6) |step(step(X,12) ,12) ) ,7) ) ,12) ,7) ) +echo(echo(transpose(transpose(transpose(X,-5) ,-7) ,-7) ,4,6) ,4,6) ) ) ,4) ) ,7) ) +transpose(transpose(transpose(transpose(transpose(transpose(((((transpose((X+transpose(transpose(X,-7) ,12) ) ,4) +transpose((X|(transpose(X,-7) |(X+X) ) ) ,7) ) +transpose(X,12) ) +transpose(echo((((transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose((X+(X+X) ) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) +((X|X) +transpose((X|X) ,12) ) ) ,4,6) ,7) ) +((echo(X,4,6) +transpose(transpose((transpose(X,4) +(X|X) ) ,-7) ,12) ) |transpose(transpose(X,4) ,-7) ) ) ,4) ,4) ,-5) ,4) ,-7) ,7) ) ,7) ) ) +step(arpeggio((((transpose(echo(((transpose(((transpose(arpeggio(X) ,-5) +(X|X) ) +transpose((transpose(X,4) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,-5) +transpose(transpose((((step(X,12) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(((X|X) +transpose((X|X) ,7) ) ,7) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ,4) ,7) ) +transpose(transpose((transpose((transpose(X,-5) +transpose((X|X) ,7) ) ,4) +transpose(step(transpose(X,-7) ,12) ,7) ) ,-5) ,12) ) ,4,6) ,-5) +transpose((transpose((transpose(arpeggio((X+transpose(((X+X) +transpose(transpose(X,-7) ,12) ) ,-7) ) ) ,4) |(echo(transpose((transpose(transpose(X,-7) ,-5) +transpose(X,-5) ) ,-5) ,4,6) +transpose((echo((X+transpose(X,12) ) ,4,6) +transpose(transpose(X,4) ,-5) ) ,4) ) ) ,4) +(transpose(transpose(arpeggio(echo(step(transpose(X,-7) ,12) ,4,6) ) ,-5) ,-5) +transpose(transpose(transpose(shuffle(((transpose(transpose(X,-7) ,4) +transpose(shuffle(((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose(step(((X|X) +echo(X,4,6) ) ,12) ,7) ) ) ,-5) ,-5) ,12) ) ) ,4) ) +transpose(echo((transpose(echo(((transpose(X,4) |((X+X) +(X|X) ) ) +transpose(transpose(X,-7) ,12) ) ,4,6) ,-5) +(transpose((X+X) ,-7) |(shuffle(X) +transpose(arpeggio(X) ,12) ) ) ) ,4,6) ,7) ) +(echo(transpose(transpose((((step(X,12) +transpose(transpose(X,4) ,7) ) +transpose((((X+transpose(X,7) ) +(step((X+transpose(X,12) ) ,12) |(X|shuffle(X) ) ) ) +transpose(transpose(((X+X) |(X+X) ) ,4) ,7) ) ,4) ) +transpose(arpeggio((arpeggio(X) |shuffle(X) ) ) ,7) ) ,-5) ,4) ,4,6) +transpose((transpose(transpose(transpose((step(transpose(X,4) ,12) +transpose(transpose((X+(X+transpose(X,7) ) ) ,4) ,7) ) ,4) ,-5) ,-5) +transpose(arpeggio(step(shuffle(((X|X) +transpose(transpose(X,-7) ,12) ) ) ,12) ) ,-5) ) ,-7) ) ) ) ,12) ) random seed used was 232487540

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