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: (shuffle(transpose(((shuffle(transpose(transpose(((transpose((X+transpose(X,12) ) ,-5) |(transpose(transpose(X,4) ,4) |(transpose(X,-7) |X) ) ) |echo((transpose(arpeggio(X) ,-5) +transpose(step(X,12) ,-5) ) ,4,6) ) ,-7) ,-7) ) |(transpose(echo(shuffle(((transpose((((X+transpose((X+transpose(X,7) ) ,12) ) +transpose((X|(X|X) ) ,12) ) +(step(X,12) +transpose(X,12) ) ) ,4) +transpose((arpeggio(X) |(X+X) ) ,4) ) +transpose(((X+step(X,12) ) +((X|(X+X) ) |transpose(transpose(transpose(X,4) ,-5) ,4) ) ) ,7) ) ) ,4,6) ,-5) |((arpeggio(transpose((transpose(arpeggio((((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X+transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) ,4) +(X+transpose((X+X) ,12) ) ) ,4) ) +transpose(((transpose(transpose(arpeggio(arpeggio(echo(X,4,6) ) ) ,4) ,-5) +transpose((step(((X|transpose(X,4) ) |(X+(X+X) ) ) ,12) +step(transpose((X+transpose(X,7) ) ,4) ,12) ) ,4) ) +transpose(((((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((shuffle(transpose(X,-5) ) |transpose(X,-7) ) ,4) ) +transpose((((((X+X) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(X,7) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(transpose((transpose(transpose(transpose(X,-5) ,-5) ,-5) +transpose((arpeggio((echo(X,4,6) +transpose(X,12) ) ) +transpose(transpose((echo(X,4,6) +(X+transpose(X,12) ) ) ,-7) ,12) ) ,7) ) ,4) ,-7) ,7) ) ) ) |echo((shuffle((((arpeggio(X) |(X+X) ) +step(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +(step((transpose(X,4) |X) ,12) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,7) ) ) ) |(shuffle(transpose(transpose(transpose((transpose((X|X) ,-7) +transpose(transpose(X,-7) ,12) ) ,4) ,-5) ,-7) ) +((transpose(transpose(((transpose(transpose(X,4) ,4) |((X+X) |X) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) ,-7) ,-7) +transpose(transpose((step(step(transpose(X,4) ,12) ,12) +(transpose(X,4) +transpose((X+transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,12) ) ) ,4) ,4) ) +transpose(((X|transpose(transpose(transpose(X,4) ,-5) ,-5) ) |transpose(arpeggio(X) ,-5) ) ,7) ) ) ) ,4,6) ) ,-7) ) +transpose(((transpose(transpose((step((((((((((X|arpeggio(X) ) +transpose(arpeggio(X) ,4) ) +transpose(X,4) ) +transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) ,7) ) +((transpose(X,-5) |((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) +arpeggio(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ) ) |echo((shuffle(transpose(X,4) ) |((((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) |((X+X) +(X+transpose(X,7) ) ) ) +transpose(transpose(X,4) ,12) ) ) ,4,6) ) |shuffle(transpose(((((X+X) +(transpose(X,-5) +transpose(X,7) ) ) |(transpose(X,-7) |X) ) +transpose((X+arpeggio(X) ) ,7) ) ,4) ) ) +transpose(transpose(transpose(echo(((transpose(X,4) +transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ,4,6) ,-5) ,4) ,7) ) +transpose(transpose(((transpose(echo((X|X) ,4,6) ,4) +transpose(transpose(transpose(echo(X,4,6) ,-5) ,4) ,4) ) +transpose(transpose((step(X,12) +transpose(X,-5) ) ,-7) ,7) ) ,4) ,12) ) ,12) |transpose(shuffle((echo(transpose((((((X+X) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X|X) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) ,4,6) +transpose((transpose((arpeggio(X) |(X+transpose(X,7) ) ) ,-7) +transpose(transpose((shuffle(X) +transpose(echo(X,4,6) ,12) ) ,-7) ,4) ) ,12) ) ) ,4) ) ,-5) ,-7) +transpose((((transpose((transpose(((arpeggio(transpose(X,-7) ) |echo((X+X) ,4,6) ) +transpose((X|(X+X) ) ,-5) ) ,4) +transpose(transpose(step(((X+transpose(X,4) ) +transpose(transpose(shuffle(X) ,-5) ,12) ) ,12) ,-7) ,7) ) ,-7) +(((transpose(((transpose(X,-5) |step(X,12) ) +transpose((X|X) ,12) ) ,4) +transpose(transpose(transpose(transpose((step((transpose(X,4) +arpeggio(X) ) ,12) +(X+(X+X) ) ) ,-5) ,4) ,4) ,4) ) +transpose((shuffle((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose((X|X) ,12) ) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,7) ) +transpose(transpose((shuffle(((X+transpose(X,12) ) +((X+X) +transpose(X,4) ) ) ) |transpose(transpose((X+transpose(arpeggio(X) ,7) ) ,4) ,-7) ) ,-5) ,12) ) ) +transpose(((echo(echo((((step(step((X+transpose(X,12) ) ,12) ,12) +transpose((transpose(transpose(echo(step(X,12) ,4,6) ,4) ,-5) +transpose(transpose((X+X) ,-7) ,7) ) ,4) ) +transpose(transpose(transpose(step(step(X,12) ,12) ,4) ,4) ,7) ) +transpose(((transpose(((X|X) +transpose(((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,7) ) ,-5) |step(transpose(transpose(X,-7) ,-5) ,12) ) +transpose(step(transpose(X,-7) ,12) ,12) ) ,12) ) ,4,6) ,4,6) +echo((transpose((((transpose(step((X+transpose(X,7) ) ,12) ,-5) |((shuffle(X) |(X+X) ) +transpose(transpose(X,4) ,12) ) ) |(transpose(((step(X,12) +transpose(X,7) ) |((transpose(X,-7) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,4) |transpose((transpose(X,-7) |transpose(X,-7) ) ,4) ) ) +((step((transpose(step(arpeggio((X+X) ) ,12) ,4) |(X+transpose(transpose(transpose(shuffle(X) ,-7) ,4) ,12) ) ) ,12) +transpose(transpose(transpose(echo((X|X) ,4,6) ,-7) ,-5) ,4) ) +transpose(((transpose(transpose(echo(X,4,6) ,-5) ,-7) +transpose(arpeggio((transpose(X,-5) +transpose((X+X) ,7) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ,-5) +transpose((echo(transpose(shuffle(X) ,-5) ,4,6) |transpose(X,4) ) ,4) ) ,4,6) ) +transpose(transpose(step((transpose(((transpose(arpeggio(arpeggio(arpeggio(X) ) ) ,-7) +transpose(transpose(transpose(arpeggio(shuffle((X+transpose(X,12) ) ) ) ,-5) ,4) ,4) ) +transpose((((transpose(echo(X,4,6) ,-7) +transpose(((transpose(transpose(X,-5) ,-7) |X) +transpose(shuffle(X) ,12) ) ,12) ) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,-7) ,7) ) +(transpose(X,-7) +X) ) ,7) ) ,4) +transpose((transpose(echo(echo(((X+transpose(X,7) ) +echo(X,4,6) ) ,4,6) ,4,6) ,-7) |step(((arpeggio(shuffle(transpose((X+X) ,4) ) ) +transpose(((transpose(X,-7) +(X|X) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose((X+(X+X) ) ,-7) ,7) ) ,12) ) ,-7) ) ,12) ,4) ,12) ) ,7) ) |transpose(transpose(transpose((((step(echo(transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-5) ,-5) ,4,6) ,12) |((((transpose((X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ,-5) +transpose((step((transpose(X,4) +transpose(transpose(X,-5) ,7) ) ,12) +shuffle(transpose((X+X) ,-7) ) ) ,12) ) +transpose((X+transpose(transpose(transpose(echo(X,4,6) ,-7) ,4) ,12) ) ,4) ) +transpose((((transpose((transpose(X,-5) +transpose(shuffle(X) ,7) ) ,4) +transpose((((X+transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) +X) ,12) ) +transpose(((X+transpose(X,4) ) +transpose((step(X,12) |X) ,7) ) ,7) ) |arpeggio(step((X+transpose((X+transpose(X,12) ) ,7) ) ,12) ) ) ,7) ) +((((transpose((X+transpose(X,12) ) ,-7) |(X+(X+transpose(X,12) ) ) ) |transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(transpose((((transpose(X,4) +transpose(arpeggio(X) ,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((transpose(X,-5) +transpose(arpeggio(X) ,12) ) ,7) ) ,4) ,4) ) +transpose(echo(transpose((X+X) ,-7) ,4,6) ,7) ) ) ) |((((transpose((arpeggio(X) +transpose(X,4) ) ,-7) +transpose((X+transpose(X,-7) ) ,12) ) +(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) +transpose(transpose(X,-7) ,12) ) ) +transpose(echo(transpose(shuffle(X) ,-7) ,4,6) ,12) ) +transpose((transpose(transpose(echo(transpose(X,-7) ,4,6) ,-7) ,4) +step(shuffle(transpose(arpeggio(X) ,-7) ) ,12) ) ,12) ) ) +transpose(((step(transpose(((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) ,4) ,12) +transpose(transpose(((step(X,12) |echo(X,4,6) ) |echo(echo(transpose(X,-7) ,4,6) ,4,6) ) ,-5) ,12) ) |(step(arpeggio((transpose(((X+X) +shuffle(X) ) ,-5) +echo(X,4,6) ) ) ,12) +((transpose(step((X+X) ,12) ,4) +(transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ,4) |((X|echo(X,4,6) ) |transpose(X,-5) ) ) ) +(echo(transpose(X,-7) ,4,6) +(X+transpose(X,7) ) ) ) ) ) ,12) ) ,4) ,-7) ,-7) ) ,4) ) +transpose((arpeggio(transpose(transpose(step((((transpose((transpose(X,4) |X) ,-5) |transpose(((X|X) |transpose(X,-5) ) ,-7) ) +transpose((transpose(X,-5) +transpose(step(X,12) ,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,-5) ,-5) ) +(transpose(((((transpose(shuffle((transpose(X,-5) |transpose(X,-7) ) ) ,4) +echo(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,4,6) ) +transpose(transpose(transpose(transpose(step(X,12) ,-7) ,-5) ,4) ,7) ) +step((arpeggio(X) +shuffle(echo((X+transpose(X,7) ) ,4,6) ) ) ,12) ) +arpeggio((shuffle(arpeggio(echo(X,4,6) ) ) +transpose(((((shuffle(X) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose((transpose(X,4) +transpose((X+X) ,12) ) ,7) ) +(transpose(X,4) |shuffle(X) ) ) |transpose(transpose(step(X,12) ,4) ,4) ) ,7) ) ) ) ,-7) +shuffle(transpose(transpose((transpose((step((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) ,12) +transpose(transpose(X,4) ,7) ) ,-5) +(transpose((X|((X+transpose(X,7) ) +transpose(X,7) ) ) ,-5) +transpose(transpose((((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(transpose((X|transpose(X,4) ) ,-5) ,-5) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,4) ,12) ) ) ,-7) ,-5) ) ) ) ,7) ) ,12) ) random seed used was 10 EXPR = step(step(((transpose(((((transpose((transpose(transpose(X,4) ,-7) |(transpose(transpose(X,4) ,-7) +transpose(X,4) ) ) ,4) +transpose((step((shuffle(X) |X) ,12) +transpose(step(arpeggio(X) ,12) ,7) ) ,12) ) +transpose((((transpose(X,4) |((X|X) +transpose(X,7) ) ) |transpose((transpose((X+X) ,-5) +transpose(transpose(X,4) ,12) ) ,-5) ) +transpose(transpose(transpose((transpose(X,4) +(X+X) ) ,-7) ,4) ,7) ) ,4) ) +transpose(transpose((transpose(transpose((X|X) ,-5) ,4) +transpose((echo(transpose(((X|X) |transpose(X,4) ) ,-7) ,4,6) +transpose(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ) ,7) ) ,-7) ,7) ) |((transpose(X,-7) +transpose(arpeggio((X+X) ) ,-5) ) +transpose(((X+transpose(X,12) ) +(X+transpose(X,12) ) ) ,7) ) ) ,-7) +(((((((transpose(X,-5) +transpose(step(X,12) ,7) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(shuffle(((X+X) |X) ) ,7) ) |(X+transpose(X,12) ) ) +transpose(X,4) ) +transpose(shuffle(step(X,12) ) ,12) ) +((((transpose((X+transpose(X,12) ) ,-5) +((X+echo(X,4,6) ) +transpose(transpose(X,4) ,12) ) ) |(((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) |transpose(X,4) ) ) +(transpose(((X+transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose(X,7) ) ,4) |(step((shuffle(X) +transpose((X+X) ,12) ) ,12) +(transpose(transpose((X|X) ,4) ,-7) +(transpose(X,-7) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ) ) ) ) |(arpeggio(transpose((X|echo(X,4,6) ) ,-7) ) +(transpose(X,4) +transpose(transpose(X,-5) ,12) ) ) ) ) ) |arpeggio(arpeggio((transpose(transpose(((shuffle(X) |(X+X) ) +echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4,6) ) ,4) ,-7) +transpose(transpose(((((transpose(X,-7) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +((X+X) +shuffle(X) ) ) +echo((X+(X|X) ) ,4,6) ) ,-7) ,12) ) ) ) ) ,12) ,12) random seed used was 0

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