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(arpeggio(step((((((((((X+(X+X) ) +transpose(transpose((X+X) ,4) ,4) ) +transpose(X,7) ) |transpose((X+transpose(X,-5) ) ,4) ) +transpose(X,7) ) |echo(transpose(echo(transpose(X,-7) ,4,6) ,-5) ,4,6) ) +transpose((transpose((X|X) ,-5) +((transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) ,-5) +transpose((arpeggio(transpose(X,-5) ) +((X|X) +transpose(shuffle(X) ,7) ) ) ,4) ) +transpose((((echo(X,4,6) +transpose(shuffle(transpose(X,-7) ) ,7) ) +transpose(transpose(arpeggio(X) ,-5) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,7) ) ) ,4) ) +transpose(transpose(((transpose(((transpose(X,-5) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) |(transpose(X,-7) +transpose(X,12) ) ) +transpose(echo((shuffle(X) +X) ,4,6) ,7) ) ,4) ,7) ) |transpose(transpose(transpose((shuffle(transpose(X,-5) ) +step(arpeggio(X) ,12) ) ,4) ,-7) ,-7) ) ,12) ) ,4,6) ,4) +arpeggio(transpose((arpeggio(((arpeggio(transpose((((transpose((shuffle(((transpose(X,4) +transpose(X,4) ) +transpose((X|X) ,7) ) ) |echo(shuffle((X+transpose(transpose(X,-7) ,12) ) ) ,4,6) ) ,4) |echo((((X|arpeggio(transpose(X,-7) ) ) +(step(transpose(X,4) ,12) +(X+transpose(X,7) ) ) ) +transpose(shuffle(echo((X+X) ,4,6) ) ,-5) ) ,4,6) ) +transpose(transpose(echo(((((arpeggio(transpose(((transpose(X,-5) |transpose(X,-7) ) +transpose(transpose(step((X+X) ,12) ,-7) ,12) ) ,4) ) +transpose(arpeggio(((((X+transpose(((X+X) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose((X|X) ,7) ) +transpose((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose(((transpose(X,4) +transpose(shuffle(X) ,4) ) +transpose(echo(step((X+X) ,12) ,4,6) ,7) ) ,12) ) ) ,4) ) +transpose(((step((X+transpose(X,7) ) ,12) +transpose((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,7) ) +(transpose(X,-5) |((((X+transpose(X,7) ) |(X+transpose(X,12) ) ) +(X+X) ) +transpose((X|transpose(X,4) ) ,12) ) ) ) ,7) ) +transpose((transpose(shuffle(transpose(arpeggio(((X|X) +X) ) ,4) ) ,-5) +transpose(arpeggio(transpose(shuffle(X) ,-5) ) ,7) ) ,4) ) +transpose(((step(transpose(X,-7) ,12) +((X+transpose(X,12) ) |shuffle(X) ) ) |(transpose(X,4) +transpose(X,12) ) ) ,7) ) ,4,6) ,4) ,4) ) +transpose((((shuffle((((X+transpose(X,12) ) |shuffle(X) ) +(X|transpose(X,4) ) ) ) +transpose((transpose(transpose(X,-7) ,-5) +transpose((X+transpose(transpose(X,4) ,7) ) ,12) ) ,4) ) +transpose((((X|X) +transpose(transpose(X,-7) ,12) ) +transpose((X+X) ,12) ) ,7) ) +((((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) |shuffle(X) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ,4) ) +transpose(((transpose(echo(((transpose((((X|X) |arpeggio(X) ) +transpose(arpeggio(X) ,12) ) ,-5) |(((X+((X+transpose(X,4) ) +transpose((X|X) ,7) ) ) +transpose(((((X+transpose(X,4) ) +transpose((X+X) ,7) ) +transpose(transpose((X+X) ,4) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,7) ) |(((transpose(X,-7) +transpose(X,7) ) |(X+X) ) |transpose(echo(X,4,6) ,4) ) ) ) +transpose(transpose(step(((((X+transpose(X,7) ) +transpose(X,12) ) |transpose((X+transpose(X,12) ) ,4) ) |(transpose(X,-7) +transpose((X|step(echo(X,4,6) ,12) ) ,12) ) ) ,12) ,4) ,7) ) ,4,6) ,4) |echo(((shuffle(transpose(transpose(X,-7) ,-7) ) +transpose((transpose((shuffle(X) +arpeggio(X) ) ,-5) +transpose(transpose(((X+transpose(X,7) ) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) ,-7) ,12) ) ,4) ) |step(transpose(transpose(transpose((arpeggio(X) |transpose(X,-5) ) ,-7) ,-5) ,-7) ,12) ) ,4,6) ) +((transpose(transpose((((((X+X) |X) +shuffle((X|X) ) ) +transpose(arpeggio(X) ,-5) ) +transpose((shuffle(transpose(((transpose(X,4) +X) +X) ,-7) ) +transpose(arpeggio(shuffle((((transpose(X,-7) +(X+X) ) +transpose(step((X+X) ,12) ,4) ) +transpose((step(X,12) +transpose(transpose(X,4) ,7) ) ,7) ) ) ) ,12) ) ,7) ) ,-7) ,4) +transpose(echo(transpose((((echo(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) +transpose((transpose((step(X,12) +transpose(X,7) ) ,-5) +transpose(X,-5) ) ,7) ) |(transpose((step(X,12) +transpose(step(X,12) ,12) ) ,4) |(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose(X,-7) ,-5) ) ) ) +transpose(arpeggio(transpose((((((echo(X,4,6) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,7) ) +(X|X) ) ,4) ) ,12) ) ,4) ,4,6) ,12) ) +(step((transpose(transpose((transpose(echo(X,4,6) ,4) +transpose(X,7) ) ,-7) ,4) +arpeggio(arpeggio(((X+transpose(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ) ,12) +((transpose(arpeggio(shuffle(X) ) ,-5) +transpose((transpose((transpose((X+X) ,-5) +X) ,-5) +((transpose(step(X,12) ,4) +transpose((arpeggio(X) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose((X|((arpeggio(X) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,7) ) ) ,12) ) |((((((((X+transpose(transpose(X,-5) ,7) ) +transpose(transpose((arpeggio(transpose(X,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,-7) ,4) ) +transpose(transpose(((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) |(transpose(transpose(X,4) ,-7) |(((X+transpose(X,4) ) +transpose(X,7) ) +step(X,12) ) ) ) ,4) ,7) ) +transpose(transpose((((transpose(X,4) +transpose((X|X) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) |shuffle((X|X) ) ) ,-5) ,4) ) +transpose(transpose(transpose((arpeggio(X) +X) ,-7) ,-5) ,7) ) +transpose(((step((X|X) ,12) |step(X,12) ) |((((step((X+transpose(X,12) ) ,12) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose((echo(X,4,6) +((X+X) |arpeggio(X) ) ) ,7) ) +transpose(transpose((X|(X+transpose(step(X,12) ,7) ) ) ,-7) ,4) ) +transpose(transpose((X+(X|X) ) ,4) ,7) ) ) ,4) ) +transpose(shuffle((((transpose(transpose((X+(X+transpose(X,12) ) ) ,-7) ,-7) +transpose(transpose(transpose((transpose(X,-7) +X) ,-7) ,4) ,7) ) +transpose(transpose(((X+transpose(transpose(X,-7) ,12) ) |step(transpose(X,-5) ,12) ) ,4) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ) ,7) ) |((((X|X) +(((transpose(X,-7) +transpose(transpose(X,4) ,12) ) +transpose((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) +shuffle(transpose(X,4) ) ) |(echo(((transpose(X,4) +transpose(transpose(transpose(X,4) ,4) ,12) ) +(transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,-7) +transpose((X+transpose(echo(X,4,6) ,12) ) ,7) ) ) ,4,6) +transpose(transpose(((((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) +transpose(step(X,12) ,4) ) +transpose((transpose(echo(X,4,6) ,-7) +transpose(transpose((X+X) ,-5) ,12) ) ,7) ) ,4) ,12) ) ) ) ) ) ) ) ,7) ) |(echo(((transpose(echo(shuffle((((X+(X+X) ) +transpose((transpose(X,-5) +X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4,6) ,-7) +transpose((shuffle(((transpose(echo(X,4,6) ,4) +transpose((X+transpose(transpose(echo(X,4,6) ,4) ,7) ) ,7) ) +transpose((transpose(X,4) |shuffle((X+transpose(X,12) ) ) ) ,12) ) ) +transpose(shuffle((transpose(transpose(step(X,12) ,-7) ,-7) +transpose(echo(transpose((transpose((X+X) ,-7) |((transpose(X,-5) |(X+transpose(X,7) ) ) +transpose(echo(X,4,6) ,4) ) ) ,-5) ,4,6) ,7) ) ) ,12) ) ,4) ) +transpose((transpose((transpose(transpose((transpose(X,4) +X) ,4) ,-7) +transpose((transpose(transpose(X,4) ,-5) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,7) ) ,-5) |transpose(step((step(transpose(X,-7) ,12) |(transpose(X,-5) +(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) ,12) ,-5) ) ,7) ) ,4,6) +(step(arpeggio(echo((arpeggio(transpose((X+transpose(X,12) ) ,-5) ) +transpose(transpose((((X|X) +transpose(X,7) ) +((X+X) +transpose(X,4) ) ) ,-5) ,12) ) ,4,6) ) ,12) +transpose((step((shuffle((((arpeggio((((X|X) +step(X,12) ) +transpose(transpose((X|X) ,4) ,7) ) ) +transpose(transpose((((echo(X,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +(transpose(X,4) |(X+X) ) ) ,-5) ,7) ) +transpose((((X|transpose(X,-5) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(echo(echo(((transpose(X,4) +transpose((X+X) ,7) ) +transpose((X+X) ,7) ) ,4,6) ,4,6) ,7) ) ) +arpeggio(shuffle(step((echo(X,4,6) +shuffle((X+transpose(X,12) ) ) ) ,12) ) ) ) ,12) +step((((shuffle((transpose(X,-7) |(X+transpose(X,7) ) ) ) |transpose(X,-5) ) +(transpose(shuffle((X|X) ) ,4) |(transpose(X,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) +((X|X) +echo(X,4,6) ) ) ,12) ) ,7) ) ) ) ) |(shuffle(transpose((transpose((shuffle((transpose((X|X) ,-5) +transpose(transpose((((transpose(X,-7) +echo(X,4,6) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose((transpose(X,4) +((X+X) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ,-5) ,7) ) ) +transpose(echo(((arpeggio(X) |X) +transpose(X,-5) ) ,4,6) ,12) ) ,4) +transpose(((echo((step(transpose(((((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) +transpose(((X+X) |arpeggio(shuffle(X) ) ) ,4) ) +transpose(transpose((X|X) ,-5) ,7) ) ,-7) ,12) |step(transpose(transpose(transpose(X,4) ,-7) ,-7) ,12) ) ,4,6) +transpose((((((X+X) +transpose((X|X) ,12) ) |X) +transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) ,4) ) +transpose(transpose((arpeggio((arpeggio((((X|X) +transpose(((X|X) +transpose((step(X,12) +transpose((X|X) ,12) ) ,12) ) ,7) ) +transpose(arpeggio((step(X,12) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ) ,12) ) ) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) ) +(((transpose((step(X,12) +transpose(transpose(X,-5) ,-5) ) ,-5) +transpose(arpeggio((X+transpose((X+X) ,7) ) ) ,12) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(echo(step(X,12) ,4,6) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) ,-7) ,7) ) +transpose(step(X,12) ,-7) ) ) ,4) ,7) ) ,12) ) ,-7) ) |echo(transpose(transpose(((step(step(X,12) ,12) +((((((transpose((X|X) ,4) +transpose((X|(X+X) ) ,7) ) +transpose((step((X+transpose(X,12) ) ,12) |transpose(X,4) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(transpose(X,4) +X) ) ,7) ) +transpose(((transpose((X+X) ,-5) +shuffle(step(X,12) ) ) +transpose(((arpeggio(X) +(X+X) ) +transpose(shuffle(shuffle((X+transpose(X,7) ) ) ) ,7) ) ,7) ) ,7) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) |(transpose(arpeggio(X) ,-7) +step(((X+transpose(X,12) ) +(X+transpose(X,12) ) ) ,12) ) ) ) +transpose((((transpose((((X|X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose(step(X,12) ,7) ) ,4) +transpose((shuffle(X) +(step(X,12) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ) ,7) ) |(((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) |(X|X) ) ,4) +transpose(((shuffle(X) +shuffle(X) ) +shuffle(transpose(X,-7) ) ) ,4) ) +transpose(shuffle((transpose(X,-7) +transpose(((X+transpose(X,12) ) +X) ,7) ) ) ,7) ) +((step(((X+X) +transpose(X,7) ) ,12) +transpose(transpose(transpose(X,4) ,-7) ,7) ) +transpose((transpose(echo(X,4,6) ,-5) +X) ,12) ) ) ) |arpeggio(arpeggio(arpeggio(X) ) ) ) ,12) ) ,4) ,-7) ,4,6) ) ) ,-5) ) ) random seed used was 232403309

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