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((transpose((transpose(((step((transpose(X,-5) |transpose(X,-5) ) ,12) +((((X+transpose(X,7) ) +transpose(X,7) ) +transpose(transpose((arpeggio((X|X) ) +transpose(((X+transpose(arpeggio(X) ,12) ) |arpeggio(X) ) ,7) ) ,4) ,4) ) +transpose((X+shuffle(shuffle(X) ) ) ,7) ) ) +arpeggio((((((X+transpose(X,12) ) |transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,-5) ,-7) ,4) ) +transpose((shuffle(X) +transpose(transpose(step(X,12) ,-7) ,7) ) ,7) ) ) ) ,-7) +transpose((step((((((transpose((X+(X+transpose(X,7) ) ) ,4) +transpose(((shuffle(transpose((X|X) ,-7) ) +transpose(transpose(X,4) ,4) ) +transpose((transpose((X+transpose(X,12) ) ,-7) +((transpose((X|X) ,-7) +transpose((shuffle(X) |(X+transpose(X,7) ) ) ,4) ) +transpose((X|X) ,7) ) ) ,7) ) ,4) ) +transpose(transpose((transpose((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ,-5) +(echo(X,4,6) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ) ,-7) ,7) ) +transpose(((arpeggio((X|X) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) ,7) ) |(arpeggio(transpose(X,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ) ) ,4) ) +transpose(echo(step(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-7) ,12) ,4,6) ,7) ) +shuffle(shuffle(((step(X,12) +(X|X) ) +transpose((X+transpose(X,12) ) ,7) ) ) ) ) ,12) +transpose(transpose(transpose((((((echo((arpeggio(transpose(X,4) ) +transpose((shuffle(X) +transpose(transpose(X,-5) ,12) ) ,7) ) ,4,6) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,12) ) +transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose((transpose(X,4) +transpose((X|X) ,4) ) ,7) ) ,4) ) +transpose(((((X+X) +transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) |X) ,7) ) +transpose(transpose(transpose((((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) +(((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,-5) ,12) ) +transpose((transpose(transpose((X|arpeggio(X) ) ,4) ,4) +((arpeggio(X) +(step(X,12) |(X|X) ) ) +(echo(X,4,6) +transpose(transpose(step(X,12) ,-5) ,12) ) ) ) ,4) ) +transpose((((shuffle(arpeggio(X) ) |(X+transpose(X,12) ) ) +transpose((X+echo((X|X) ,4,6) ) ,12) ) +step((X+X) ,12) ) ,7) ) ,4) ,-5) ,12) ) ,12) ) ,4) +(echo((transpose((shuffle(X) +transpose(transpose(X,-5) ,12) ) ,-7) |shuffle((X+(X+X) ) ) ) ,4,6) +transpose(transpose(echo(transpose(shuffle((shuffle((X+(X+X) ) ) +transpose((X+transpose(X,7) ) ,12) ) ) ,4) ,4,6) ,4) ,12) ) ) ,4) +transpose(shuffle(transpose(transpose((((X+transpose(transpose((step(X,12) +(transpose(X,-5) +transpose(X,7) ) ) ,-7) ,12) ) +transpose((echo((transpose(transpose(echo(step(X,12) ,4,6) ,-5) ,-7) +transpose(shuffle(transpose(step(transpose(X,4) ,12) ,-7) ) ,4) ) ,4,6) +transpose(arpeggio(transpose(transpose(((transpose(shuffle((X+X) ) ,-7) +transpose(shuffle(X) ,4) ) +transpose((((X+X) +transpose(X,12) ) +transpose(transpose(transpose(transpose(X,-7) ,4) ,-7) ,7) ) ,7) ) ,-5) ,-5) ) ,12) ) ,12) ) +step((transpose((transpose(((X|X) +X) ,4) |shuffle((X|X) ) ) ,-5) +((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) |((transpose(X,-5) +(shuffle(X) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) ) +transpose(transpose(((transpose(X,4) +transpose((X|X) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ,12) ) ) +transpose((((((transpose(echo(X,4,6) ,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) |(transpose(step(transpose(X,-5) ,12) ,4) +transpose(((transpose(X,-5) +X) +(arpeggio(X) |shuffle(X) ) ) ,4) ) ) +echo(transpose((((X+X) +transpose(X,12) ) +(X+transpose(X,7) ) ) ,-5) ,4,6) ) ,7) ) ) ,12) ) ,-7) ,4) ) ,4) ) +transpose(transpose(shuffle(((transpose(transpose(transpose(((X|X) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,4) ,4) ,-5) +transpose((transpose(echo(((step(X,12) +transpose((X+X) ,7) ) |(step(X,12) |(X+transpose((X+transpose(X,12) ) ,7) ) ) ) ,4,6) ,4) |(transpose((transpose(X,-7) |step(arpeggio(transpose(X,4) ) ,12) ) ,4) +((echo(shuffle(shuffle(X) ) ,4,6) +(X+transpose((X+X) ,-5) ) ) +transpose(transpose(transpose(X,-7) ,-7) ,-5) ) ) ) ,-7) ) |transpose(((((transpose((transpose(transpose(X,4) ,4) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ,4) |((transpose(transpose(((X+transpose(X,12) ) +(X+transpose(X,12) ) ) ,-7) ,-5) +transpose((transpose(shuffle(step(X,12) ) ,4) +transpose(((transpose(X,-5) +((X+transpose(X,7) ) +transpose(X,12) ) ) +transpose(transpose((X|X) ,-5) ,12) ) ,12) ) ,12) ) +(transpose(((transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) +transpose(transpose(transpose(transpose(echo(X,4,6) ,4) ,-5) ,-5) ,4) ) +transpose(echo(shuffle((X+transpose(X,4) ) ) ,4,6) ,7) ) ,4) +transpose(transpose((arpeggio(((X|X) +transpose(step(X,12) ,7) ) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) ,-7) ,7) ) ) ) +(step(((echo((arpeggio(X) |(X+transpose(shuffle(X) ,12) ) ) ,4,6) |(X+X) ) |transpose(arpeggio(X) ,-5) ) ,12) +(((transpose((X+transpose(X,4) ) ,-5) +transpose((echo(transpose(X,-5) ,4,6) +transpose((X|((X|X) +transpose(X,7) ) ) ,7) ) ,4) ) +transpose((((transpose(((X+X) +(X+X) ) ,4) +transpose((transpose(transpose(X,-7) ,-5) +transpose((transpose(X,-5) +transpose(X,-5) ) ,4) ) ,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((transpose(X,-7) |step((X+X) ,12) ) ,7) ) ,7) ) |transpose((X+transpose(X,12) ) ,4) ) ,7) ) |((step(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ,12) |transpose((((X+X) +transpose((X+transpose(X,12) ) ,7) ) +transpose(echo(X,4,6) ,12) ) ,-5) ) +transpose(((transpose((((echo((X+transpose(X,12) ) ,4,6) +X) +transpose(step((X+X) ,12) ,4) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ,4) +transpose(transpose(((transpose(X,-5) +transpose(step((X+transpose(X,12) ) ,12) ,4) ) +transpose((arpeggio(X) |X) ,7) ) ,-7) ,4) ) +transpose((echo(arpeggio(X) ,4,6) +transpose(((X+X) +transpose(X,7) ) ,12) ) ,7) ) ,7) ) ) ) ) +transpose(transpose(((((((transpose(X,-7) +transpose(((step(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,12) +transpose(transpose((transpose(X,-5) +(X+transpose(X,12) ) ) ,4) ,4) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,4) ) +transpose(((X|X) +transpose(X,7) ) ,7) ) +transpose(transpose((transpose(X,-5) +transpose(X,4) ) ,4) ,4) ) +transpose(echo(transpose(((X+X) +transpose(X,4) ) ,4) ,4,6) ,7) ) +transpose(((echo(X,4,6) +transpose(transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,7) ) ,-5) ,4) ) +transpose(transpose(((((X+transpose(X,12) ) |transpose(X,4) ) +transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ,4) ) +transpose(step(transpose(transpose((((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) |(X|X) ) ,-5) ,4) ,12) ,7) ) ,-5) ,4) ) +transpose((transpose(transpose((transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |step((X|X) ,12) ) ,4) ,-7) |arpeggio(arpeggio(transpose(X,-7) ) ) ) ,4) ,4) +((((echo(transpose(X,-5) ,4,6) +transpose((((transpose(transpose(((X+X) +transpose(X,-5) ) ,-7) ,-5) +transpose((transpose(arpeggio(X) ,-5) +transpose((transpose(X,-7) +transpose(arpeggio(X) ,7) ) ,7) ) ,7) ) +transpose((((echo(X,4,6) +(X|transpose(X,-5) ) ) +transpose(shuffle(X) ,12) ) +transpose(transpose((X+X) ,-7) ,12) ) ,4) ) +transpose(transpose((shuffle(X) +(X|X) ) ,-5) ,7) ) ,7) ) +transpose(((step(shuffle(arpeggio(((transpose(X,-7) |step(X,12) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) ) ,12) +transpose(((arpeggio((X|X) ) |((transpose(X,-7) +X) +transpose((X+transpose(X,7) ) ,-7) ) ) |transpose(transpose(transpose(transpose(X,4) ,-5) ,-5) ,-7) ) ,4) ) +transpose(shuffle(step(((arpeggio(arpeggio(transpose(X,-5) ) ) +transpose(((((X+X) |transpose(X,-7) ) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose((X+transpose(step(X,12) ,7) ) ,-7) ,7) ) ,12) ) ,7) ) ,4) ) +transpose((step(step(X,12) ,12) +(X+transpose(X,7) ) ) ,7) ) +transpose((arpeggio(transpose(step(step(X,12) ,12) ,-7) ) +transpose(echo((arpeggio(transpose(echo(X,4,6) ,-7) ) +transpose(transpose((((X+transpose(X,7) ) +transpose(X,12) ) +transpose(X,7) ) ,-5) ,7) ) ,4,6) ,-7) ) ,7) ) ) ,7) ) ,4) ) ) ,4) ,7) ) +shuffle(((transpose((transpose(arpeggio(((echo(arpeggio(X) ,4,6) +transpose(arpeggio(X) ,12) ) +transpose((X|X) ,12) ) ) ,-7) +transpose(((transpose(transpose(X,-5) ,4) +transpose(arpeggio(transpose(X,4) ) ,12) ) |(arpeggio(transpose(X,-7) ) +step(echo((X|X) ,4,6) ,12) ) ) ,7) ) ,-7) +transpose(((step(echo(((transpose(X,-5) +transpose((X|X) ,4) ) +transpose((((X|X) |((arpeggio(X) +transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ) +transpose(step(transpose(transpose(X,-7) ,-7) ,12) ,7) ) ,12) ) ,4,6) ,12) +transpose(step(step(shuffle(transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +X) +step(X,12) ) +transpose((shuffle(X) |(X+transpose(X,12) ) ) ,7) ) +transpose((echo(arpeggio(X) ,4,6) |transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ,4) ) ,4) ) +transpose(((step((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) +transpose(shuffle(transpose(step(X,12) ,-7) ) ,4) ) +transpose(transpose(((X+transpose(X,7) ) |X) ,-7) ,7) ) ,7) ) ,-5) ) ,12) ,12) ,7) ) |((step((((echo(transpose(transpose(X,-5) ,-5) ,4,6) |transpose(arpeggio(arpeggio(X) ) ,-5) ) +transpose(((((transpose(X,4) +transpose(transpose(((X+transpose(X,7) ) +echo(X,4,6) ) ,-5) ,12) ) +transpose(echo((transpose(X,4) |(transpose(echo(X,4,6) ,-7) +shuffle(transpose(X,-7) ) ) ) ,4,6) ,4) ) +transpose((((transpose(X,-7) +X) +((X+X) |(X+X) ) ) +arpeggio(transpose(shuffle(X) ,-5) ) ) ,7) ) +transpose((transpose(shuffle(((transpose(X,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(X,-5) ,-5) ) ) ,4) +shuffle(echo(transpose((transpose(X,-5) +transpose((X+transpose(X,4) ) ,7) ) ,-5) ,4,6) ) ) ,12) ) ,4) ) +transpose((transpose(arpeggio((((X|X) +transpose(step(X,12) ,7) ) +transpose(transpose((X+transpose((X+X) ,7) ) ,-7) ,12) ) ) ,4) +transpose((echo(X,4,6) |transpose(((X+transpose((X+X) ,7) ) +transpose((transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-7) ) ,7) ) ,7) ) ,12) +transpose((transpose(transpose(transpose(((transpose(X,-5) +(transpose(X,-5) +transpose(X,12) ) ) |arpeggio(transpose(X,-5) ) ) ,-7) ,-5) ,-5) +transpose(transpose((arpeggio((X+transpose(X,12) ) ) |transpose(transpose(X,-7) ,-7) ) ,4) ,-7) ) ,4) ) +transpose(transpose(((((((transpose(transpose(echo(X,4,6) ,-5) ,-7) +transpose((((X+transpose(X,7) ) |(X+X) ) |((arpeggio(arpeggio(X) ) +transpose(((X+X) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,-7) ) +transpose(transpose(shuffle((((X+transpose(((X+X) +transpose(X,12) ) ,4) ) +transpose(X,7) ) |(X+X) ) ) ,-7) ,4) ) +transpose(transpose((echo((transpose(X,-5) +transpose(X,12) ) ,4,6) |arpeggio(transpose(X,-5) ) ) ,-5) ,7) ) +transpose(transpose(transpose(echo((transpose(transpose(X,4) ,4) +transpose(transpose((X|X) ,4) ,12) ) ,4,6) ,-5) ,4) ,4) ) +transpose((((X|transpose(X,4) ) +((step((X+transpose(X,12) ) ,12) +transpose((X+transpose(X,7) ) ,7) ) +((shuffle(X) +(X+transpose(arpeggio(X) ,7) ) ) |echo(X,4,6) ) ) ) |(((echo((((X+transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(X,7) ) ,4,6) +transpose((transpose(X,-5) |echo(X,4,6) ) ,4) ) +transpose((transpose(arpeggio(X) ,4) +step(transpose(X,-5) ,12) ) ,7) ) +transpose((((X|X) |X) |transpose(X,-7) ) ,7) ) ) ,7) ) +transpose(((echo(step(X,12) ,4,6) +transpose(transpose((X+X) ,-7) ,7) ) +(transpose(arpeggio(((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) +(X+transpose((X|X) ,4) ) ) ) ,7) ) ,-5) ,7) ) ) ,4) ) +transpose(((echo((transpose(X,-7) +transpose((X+X) ,12) ) ,4,6) +transpose(step(((((echo(transpose(transpose(X,4) ,-5) ,4,6) |transpose((transpose((X+X) ,4) |X) ,4) ) +((transpose(transpose(shuffle(X) ,-5) ,-7) +transpose(((X|X) +transpose(X,-7) ) ,12) ) +transpose(echo(step(X,12) ,4,6) ,-7) ) ) +transpose(echo(transpose(transpose((((X+X) +transpose((X+transpose(X,12) ) ,4) ) +transpose((step(X,12) |X) ,7) ) ,-5) ,4) ,4,6) ,4) ) +transpose(transpose((arpeggio(X) +step(X,12) ) ,-7) ,7) ) ,12) ,12) ) |transpose(arpeggio(step(transpose(transpose((transpose((step(X,12) +(X+transpose(step(shuffle(X) ,12) ,7) ) ) ,4) |((shuffle(X) +((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,-7) ) ) ,-7) ,-5) ,12) ) ,4) ) ,7) ) ) ) random seed used was 227787911

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