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((transpose(transpose(echo(transpose(X,-7) ,4,6) ,-5) ,-7) +((((((arpeggio(transpose(X,-7) ) |transpose((X+X) ,-5) ) |((arpeggio(echo(X,4,6) ) +transpose(((((step(X,12) +transpose((step(X,12) +transpose(X,-7) ) ,4) ) +transpose((X+(X+X) ) ,7) ) +transpose((X|(X+transpose(X,12) ) ) ,4) ) +transpose((transpose((X|X) ,4) +step(X,12) ) ,7) ) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ) +transpose(((step(transpose(X,-5) ,12) +(X+X) ) +transpose(transpose((transpose(X,-7) +transpose(shuffle(X) ,7) ) ,4) ,12) ) ,4) ) +transpose(echo(shuffle(((arpeggio((X+transpose(X,12) ) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |((transpose(transpose(X,-7) ,4) +transpose(X,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ) ,7) ) ) ,4,6) ,7) ) +transpose((shuffle((((transpose((shuffle(X) +transpose(X,12) ) ,-7) +((X|X) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ) +transpose(transpose((((X+transpose(arpeggio(X) ,4) ) +transpose((X|X) ,7) ) +transpose((X|X) ,12) ) ,-7) ,4) ) +transpose((((X+transpose((X+X) ,7) ) +transpose(((X+transpose(transpose(X,-5) ,7) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,4) ) +transpose(step((X|X) ,12) ,7) ) ,7) ) ) |step((((((X+transpose(X,7) ) +transpose(X,7) ) |echo(transpose(X,-5) ,4,6) ) |transpose(echo((X|X) ,4,6) ,-5) ) +arpeggio(transpose(transpose(X,-7) ,-7) ) ) ,12) ) ,4) ) +transpose((((((X|X) +X) +transpose(arpeggio(arpeggio(X) ) ,12) ) +transpose(arpeggio((transpose(echo(X,4,6) ,4) +transpose(X,4) ) ) ,12) ) +transpose((transpose(X,-7) +transpose(transpose(X,4) ,7) ) ,12) ) ,7) ) ) ,-7) +transpose(transpose(transpose(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((((X|X) +transpose(arpeggio(shuffle(X) ) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) +((shuffle(arpeggio(transpose(X,-7) ) ) +transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose(step(X,12) ,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) |(((transpose(X,-5) |transpose(X,-5) ) +transpose(((X|X) |transpose(X,4) ) ,4) ) +transpose((X+X) ,7) ) ) ) +transpose(((((X|X) |step(step(X,12) ,12) ) +echo((X|X) ,4,6) ) +transpose(shuffle((X+X) ) ,-5) ) ,12) ) ,4) ,-7) ,-5) ,7) ) +transpose((((shuffle(transpose(step(((X|X) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,12) ,-5) ) |(transpose(shuffle(echo(X,4,6) ) ,-7) +X) ) +(transpose((transpose(((shuffle(X) +(X+X) ) +transpose(transpose(X,-5) ,7) ) ,4) +transpose((((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) |(X+X) ) +transpose(transpose(X,-5) ,4) ) ,7) ) ,-7) |((transpose(shuffle((((X+transpose(X,12) ) +X) |((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ) ,-7) |transpose(echo(X,4,6) ,-5) ) +transpose(transpose((transpose(step(X,12) ,4) +((transpose(X,4) +transpose((transpose(X,-5) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ) ,4) ,12) ) ) ) +((step(transpose(echo(transpose(((((transpose(X,4) +X) +transpose(transpose(X,4) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) |((((X+transpose((X+X) ,4) ) +transpose((X+X) ,7) ) |step(X,12) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ) ,4) ,4,6) ,-5) ,12) +transpose(arpeggio(transpose((transpose(((shuffle(X) +transpose(X,12) ) +(X+transpose(X,12) ) ) ,-5) +transpose(transpose(step(transpose(X,-7) ,12) ,4) ,7) ) ,-7) ) ,4) ) +transpose(transpose(step(transpose((((X+transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) +transpose(X,-5) ) ,-7) ,12) ,4) ,7) ) ) ,4) ) +transpose((transpose(transpose(transpose((((transpose(X,4) +((X+transpose(((X|(X+X) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(((transpose(X,-5) +shuffle(X) ) +arpeggio((X+X) ) ) ,7) ) ) +transpose(((X+X) |X) ,4) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) ,4) ,12) ) ,4) ,4) ,4) |(((((shuffle(X) |(X|X) ) +transpose(echo((X|X) ,4,6) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,7) ) +transpose(((shuffle(X) +transpose((X|(X+(X+X) ) ) ,4) ) +transpose(((echo(X,4,6) |X) +echo(transpose(X,-7) ,4,6) ) ,7) ) ,12) ) ) ,4) ) +transpose((((((transpose(transpose((arpeggio(X) +transpose(((transpose(((shuffle(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) |X) ,-7) +transpose(transpose((arpeggio(X) +transpose(X,-7) ) ,4) ,4) ) +transpose(shuffle((transpose(X,4) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ) ,7) ) ,12) ) ,-5) ,-7) +transpose(transpose((transpose((((((transpose(X,-5) |((X+X) |X) ) +transpose((X+X) ,4) ) +echo((((X+transpose(X,4) ) +transpose(X,7) ) |(transpose(X,4) |shuffle(X) ) ) ,4,6) ) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose(((echo(transpose(X,-7) ,4,6) +transpose((((shuffle(X) +(X+X) ) +transpose(X,4) ) +transpose(arpeggio(arpeggio(transpose(X,-7) ) ) ,12) ) ,4) ) +transpose(transpose((X|(X+transpose(X,12) ) ) ,-5) ,7) ) ,7) ) ,-5) +transpose((echo((transpose(step((X+transpose(transpose(X,-5) ,12) ) ,12) ,-5) +transpose(transpose((X+transpose(echo(X,4,6) ,7) ) ,4) ,4) ) ,4,6) +transpose(((transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,4) +echo(transpose((X|X) ,-5) ,4,6) ) +transpose((X+transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ,7) ) ,12) ) ,12) ) ,12) ) ,-5) ,7) ) +transpose(arpeggio(echo(transpose((((X+X) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle((X|X) ) ,7) ) ,-7) ,4,6) ) ,4) ) +transpose(step(transpose((step(shuffle((transpose(X,-5) +transpose(shuffle((X+transpose(X,7) ) ) ,12) ) ) ,12) +arpeggio((arpeggio(X) +transpose(echo(transpose(((step(X,12) +transpose(transpose(X,-5) ,12) ) |shuffle(transpose(X,-7) ) ) ,-7) ,4,6) ,7) ) ) ) ,4) ,12) ,7) ) +transpose(arpeggio(transpose(transpose(transpose((transpose((transpose(transpose(X,-7) ,4) +transpose(transpose(X,-7) ,-7) ) ,-7) +transpose(shuffle((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |(transpose(X,-7) +transpose(X,-7) ) ) ) ,-7) ) ,-7) ,4) ,-5) ) ,4) ) +transpose(transpose(transpose((((((transpose((X+transpose(X,7) ) ,-5) +transpose(((X+(X|X) ) |X) ,4) ) +transpose(transpose(((shuffle(X) +transpose((X|X) ,4) ) +transpose(X,7) ) ,-7) ,7) ) +transpose(echo(transpose(echo((transpose(X,4) |step(X,12) ) ,4,6) ,-5) ,4,6) ,12) ) +echo(shuffle(((((X+X) +transpose((X+transpose(X,7) ) ,12) ) +(shuffle(X) +transpose(echo(X,4,6) ,7) ) ) |(((X+X) +transpose((X+transpose(X,12) ) ,7) ) +X) ) ) ,4,6) ) +transpose(((transpose(((((step((X|X) ,12) +transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose((X+transpose(transpose(X,-7) ,12) ) ,-5) ,7) ) +(shuffle(echo(X,4,6) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +(echo(X,4,6) +X) ) ) ) ,-5) +transpose(((((shuffle(transpose(((X|X) |(X+transpose(X,12) ) ) ,-7) ) +transpose(echo(transpose(transpose(X,-5) ,4) ,4,6) ,4) ) +transpose((((transpose(X,-5) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((X+transpose((X+X) ,12) ) ,7) ) ,7) ) +transpose(transpose(arpeggio((arpeggio(X) |transpose(X,-7) ) ) ,-5) ,4) ) +transpose(echo((((X|X) |X) |transpose((X+transpose(X,12) ) ,-5) ) ,4,6) ,7) ) ,4) ) +transpose(transpose(arpeggio(arpeggio(transpose(transpose((X+X) ,-7) ,-5) ) ) ,4) ,7) ) ,12) ) ,-5) ,4) ,7) ) ,7) ) ) +transpose(echo(((transpose((transpose((((X+transpose(((X+X) +transpose(X,4) ) ,12) ) +((transpose(X,-5) |(X+X) ) +transpose(X,4) ) ) +transpose(arpeggio((arpeggio(X) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ) ,7) ) ,-7) |transpose(arpeggio(((transpose(X,-5) |(transpose(X,4) +((X+transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) ) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ) ,4) ) ,-7) +(shuffle(transpose(transpose(((transpose((((arpeggio(X) |transpose(X,4) ) +transpose(shuffle(shuffle(X) ) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,-7) +transpose((X+transpose((transpose(X,-7) +(step(X,12) |X) ) ,7) ) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) ,4) ,4) ) +transpose((transpose(shuffle(step((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,12) ) ,12) ) ,-5) |transpose(transpose(transpose(shuffle(X) ,-7) ,4) ,-5) ) ,12) ) ) |((step(((shuffle((shuffle((X|X) ) +transpose((X+(X+X) ) ,7) ) ) +transpose((echo(arpeggio(transpose(step(X,12) ,-7) ) ,4,6) +transpose(((echo((echo((X+transpose(X,7) ) ,4,6) +transpose(X,7) ) ,4,6) +transpose(step((X|X) ,12) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ,12) ) +transpose((shuffle(X) +echo(X,4,6) ) ,12) ) ,12) |transpose(((transpose((((X+transpose(X,7) ) +transpose(arpeggio(step((X|X) ,12) ) ,4) ) +transpose(((X|X) |transpose(transpose(X,4) ,-5) ) ,7) ) ,4) +transpose((transpose(transpose(echo(echo(X,4,6) ,4,6) ,-7) ,4) +step((((X+transpose(transpose(X,-5) ,4) ) +transpose(shuffle(X) ,7) ) |(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(((X|X) +step(X,12) ) ,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ) ,12) ) ,12) ) +arpeggio(((shuffle(arpeggio(((X+transpose(X,12) ) +arpeggio(X) ) ) ) +(arpeggio(X) +transpose(transpose(X,4) ,12) ) ) |((transpose(arpeggio(transpose(X,-7) ) ,-5) |((arpeggio((X+X) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(transpose(((((X|X) +transpose(X,-5) ) +transpose(transpose((X+X) ,4) ,4) ) +transpose(shuffle(X) ,7) ) ,-7) ,12) ) ) ) ) ,-5) ) +transpose(((shuffle(transpose(((echo(transpose((X|X) ,4) ,4,6) +transpose(shuffle(((arpeggio((X+transpose(X,12) ) ) +transpose(transpose((echo(X,4,6) +transpose(X,7) ) ,-5) ,4) ) +transpose((transpose(X,-5) +transpose(transpose(X,4) ,-5) ) ,7) ) ) ,4) ) +transpose(((transpose(transpose(echo(X,4,6) ,4) ,-7) +step(transpose((X+transpose(X,7) ) ,-5) ,12) ) +transpose((((X|(X+X) ) +transpose(arpeggio(transpose(X,-7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,7) ) ,-5) ) +transpose(step(((step(echo(shuffle(X) ,4,6) ,12) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ,4) ) |(echo(((X+(X+X) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,12) ) ,4,6) +transpose((arpeggio((X+transpose(echo(X,4,6) ,12) ) ) +transpose(transpose((X|X) ,-5) ,12) ) ,7) ) ) ,12) ,4) ) +transpose(arpeggio(transpose(transpose(transpose(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,-5) ,-7) ,4) ) ,7) ) ,4) ) ) ,4,6) ,4) ) +transpose(echo(echo((transpose(transpose(((transpose(((step(transpose((X+transpose(X,7) ) ,-7) ,12) +arpeggio(((X+(X+transpose(X,12) ) ) +transpose(X,7) ) ) ) |transpose((step(X,12) |(X+transpose(X,12) ) ) ,4) ) ,-5) |transpose(arpeggio((transpose(transpose(X,-7) ,-7) +transpose(shuffle(shuffle(X) ) ,7) ) ) ,-7) ) +(shuffle(echo((transpose(X,-7) +(X|X) ) ,4,6) ) +transpose(transpose((transpose(transpose(X,-7) ,-7) |transpose(X,-5) ) ,-5) ,4) ) ) ,-5) ,-5) +transpose(echo(echo((transpose(echo(transpose((arpeggio(X) +transpose(shuffle(X) ,12) ) ,4) ,4,6) ,4) |(((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |step((X+transpose(X,7) ) ,12) ) +transpose(transpose(transpose(((((X+X) |(X+arpeggio(X) ) ) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose((shuffle(X) +transpose(X,7) ) ,7) ) ,-7) ,4) ,12) ) +transpose(((X+X) +transpose(X,12) ) ,4) ) +transpose((transpose(((X+X) +transpose((X|X) ,12) ) ,-7) |transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |X) +step(step(X,12) ,12) ) ,4) ) ,4) ) +transpose(echo((arpeggio((shuffle((transpose(X,-7) +transpose(X,4) ) ) +transpose(((X|step(X,12) ) +((step(X,12) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) ) |((X+echo(X,4,6) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ) ,4,6) ,7) ) ) ,4,6) ,4,6) ,7) ) ,4,6) ,4,6) ,7) ) random seed used was 210879174

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