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((((echo(((((transpose(arpeggio(echo(X,4,6) ) ,-7) +transpose(step(X,12) ,7) ) +transpose(((transpose((X+transpose(X,7) ) ,-5) +transpose((X+transpose((transpose(X,-7) |transpose(X,-7) ) ,12) ) ,4) ) +transpose(((transpose(X,4) +transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,4) ) +transpose(step(step(step((X+transpose(X,12) ) ,12) ,12) ,12) ,7) ) +transpose(shuffle(shuffle(X) ) ,7) ) ,4,6) +transpose((transpose(echo((((X+transpose((((X+transpose(X,7) ) +transpose(arpeggio(X) ,7) ) +(transpose(step(X,12) ,-5) |((X|X) |transpose(X,4) ) ) ) ,4) ) +transpose(echo((X|X) ,4,6) ,7) ) +transpose(shuffle((X+transpose((X+transpose(X,7) ) ,12) ) ) ,12) ) ,4,6) ,-5) +transpose(transpose(((shuffle(arpeggio((transpose(X,-7) +transpose(X,7) ) ) ) +transpose(((transpose(((((X+transpose(X,12) ) |transpose(X,4) ) +transpose(transpose((X+(X|X) ) ,-5) ,4) ) +transpose((X+transpose(arpeggio(X) ,7) ) ,7) ) ,-5) +transpose((((arpeggio(X) +transpose(X,7) ) +transpose(transpose(transpose(echo(X,4,6) ,4) ,-7) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(shuffle(transpose(X,-7) ) ,12) ) ,7) ) ,4) ) +transpose(((transpose((((X+transpose(X,12) ) |arpeggio(X) ) +transpose((step(X,12) +transpose(transpose(X,-7) ,7) ) ,12) ) ,-5) +transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(shuffle(X) ,12) ,7) ) ,4,6) ,4) ) +transpose(shuffle(echo(transpose(X,-7) ,4,6) ) ,7) ) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,-5) ,12) ) ,7) ) +transpose((arpeggio((((transpose(X,-7) +transpose(arpeggio(shuffle(X) ) ,7) ) +transpose(arpeggio(X) ,12) ) +transpose(transpose(transpose(((X+X) +transpose(arpeggio(X) ,12) ) ,4) ,-7) ,12) ) ) +transpose(((echo(transpose((transpose((((arpeggio(X) +(X+X) ) +transpose(((X+transpose(X,12) ) +transpose(X,-5) ) ,4) ) +transpose((transpose(X,-5) +transpose(arpeggio(X) ,7) ) ,7) ) ,-5) +transpose(transpose(arpeggio(transpose(X,-5) ) ,4) ,7) ) ,-7) ,4,6) +transpose(step((((echo(shuffle((X+transpose(X,12) ) ) ,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) +transpose((transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) ,-5) +transpose((((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,7) ) ,7) ) +transpose(echo(((step(X,12) +(X+transpose(X,12) ) ) |echo(X,4,6) ) ,4,6) ,12) ) ,12) ,7) ) |((shuffle(shuffle(step(X,12) ) ) |((shuffle(transpose(step(X,12) ,-5) ) +transpose((transpose(echo((X|X) ,4,6) ,4) |((transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-7) +transpose((echo((X+X) ,4,6) |(echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,4) ) +transpose((step(echo(X,4,6) ,12) +(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) ,7) ) ) ,12) ) |transpose((((X+transpose(transpose((X+transpose(X,12) ) ,4) ,12) ) +transpose(step(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,12) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ) ) +transpose((arpeggio((X+transpose(((X|step(X,12) ) +transpose(echo(X,4,6) ,7) ) ,12) ) ) |transpose(X,-7) ) ,7) ) ) ,7) ) ,4) ) +transpose(((step((((echo(((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(step((X+transpose(X,7) ) ,12) ,12) ) ,4,6) +transpose(transpose(echo(transpose(transpose(X,4) ,-5) ,4,6) ,-5) ,12) ) +transpose(shuffle(echo((((X+transpose(X,7) ) +X) +transpose(shuffle(X) ,12) ) ,4,6) ) ,4) ) +transpose(arpeggio(((arpeggio(arpeggio(X) ) +transpose(((transpose(shuffle(transpose(X,-7) ) ,4) +transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose((shuffle(X) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ,7) ) ,12) |transpose(((((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(arpeggio(step((X|X) ,12) ) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |arpeggio(transpose(shuffle(echo((X+transpose(X,12) ) ,4,6) ) ,4) ) ) ,-5) ) +transpose(((shuffle((transpose(shuffle(X) ,4) +transpose(((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,12) ) ) +transpose(((((echo(arpeggio(X) ,4,6) +transpose(step(X,12) ,12) ) +echo(transpose(X,-7) ,4,6) ) +transpose((((transpose(arpeggio((X|X) ) ,-5) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(transpose(step((X+X) ,12) ,-7) ,7) ) +transpose(((echo((X+transpose(X,7) ) ,4,6) +transpose(((transpose((X|X) ,4) +transpose(X,4) ) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,7) ) ,12) ) +echo(((transpose(X,4) +transpose((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ) ,7) ) ,4) ) +transpose(step(echo(transpose((X+transpose(X,4) ) ,-7) ,4,6) ,12) ,7) ) ,12) ) +transpose(transpose((step((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) +transpose((transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,-5) |echo(X,4,6) ) ,12) ) ,4) ,7) ) ,7) ) ,7) ) ) +transpose(((shuffle((shuffle(((arpeggio(step(shuffle(X) ,12) ) +transpose(echo((shuffle(X) +transpose(X,12) ) ,4,6) ,4) ) +transpose((arpeggio(X) +transpose(X,12) ) ,7) ) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(echo(((step(arpeggio(arpeggio(X) ) ,12) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) +transpose(((shuffle(arpeggio(X) ) +transpose(((arpeggio((X+transpose((X+transpose(X,12) ) ,-7) ) ) +transpose(transpose(shuffle(echo((X|X) ,4,6) ) ,4) ,4) ) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((X+transpose(step(X,12) ,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4,6) ,7) ) +transpose(transpose((shuffle(((transpose((X+transpose(X,12) ) ,-7) |((X+transpose(X,7) ) +transpose(X,12) ) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((((transpose(X,4) |step(X,12) ) |(arpeggio(X) |step(X,12) ) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) ) ,12) ) ,4) ,7) ) ,12) ) +transpose(transpose(echo(((transpose((((((X+transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) +transpose(echo(arpeggio(((X+transpose(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) ,4,6) ,4) ) +transpose((transpose(step(transpose(echo(X,4,6) ,-7) ,12) ,-5) +(arpeggio((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) |(X+transpose(X,7) ) ) ) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) +transpose(shuffle((shuffle(step(X,12) ) +transpose(step((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ,7) ) ) ,7) ) ,-7) +transpose(shuffle((shuffle(((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ) |((((step(X,12) +transpose((transpose(X,4) +(X+transpose(X,12) ) ) ,4) ) +transpose(X,7) ) +transpose(((X|echo(X,4,6) ) +transpose((X|shuffle(X) ) ,7) ) ,12) ) +transpose(shuffle(step((transpose(X,-5) |step(X,12) ) ,12) ) ,12) ) ) ) ,4) ) +transpose((transpose((echo((arpeggio(echo((echo(transpose(X,4) ,4,6) +transpose(shuffle(X) ,7) ) ,4,6) ) +transpose((((((X+transpose(X,7) ) +transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(X,7) ) +transpose(arpeggio((X+transpose((X+transpose(X,7) ) ,12) ) ) ,7) ) ,12) ) ,4,6) +transpose(((step(step((X|(X+transpose(X,12) ) ) ,12) ,12) +transpose(arpeggio(step(shuffle(X) ,12) ) ,7) ) +transpose(transpose(step(transpose(X,-7) ,12) ,4) ,12) ) ,7) ) ,4) +transpose(step(((transpose((X+transpose(X,7) ) ,-7) +transpose(((step(transpose((X+X) ,-5) ,12) +transpose(transpose(((echo(X,4,6) |arpeggio(X) ) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,-7) ,4) ) +transpose((arpeggio(step(X,12) ) |shuffle(((X+transpose(X,7) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ) ) ,7) ) ,12) ) +shuffle(((echo(X,4,6) +transpose(transpose(X,-5) ,7) ) +transpose(X,7) ) ) ) ,12) ,7) ) ,7) ) ,4,6) ,-7) ,12) ) +transpose(step((((transpose(echo((step(shuffle(shuffle(((X+transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) +transpose(((X+transpose(arpeggio(echo(X,4,6) ) ,4) ) +transpose(X,7) ) ,7) ) ) ) ,12) +transpose(transpose(((((arpeggio(transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) +transpose((step((X+transpose(X,7) ) ,12) +transpose((X|echo(X,4,6) ) ,12) ) ,12) ) +transpose(step(((transpose(X,-5) +transpose(echo(X,4,6) ,12) ) +transpose(transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ,-5) ,7) ) ,12) ,7) ) +transpose(transpose((arpeggio(transpose(X,4) ) +transpose(((X+transpose(X,7) ) +transpose(step(X,12) ,12) ) ,7) ) ,4) ,7) ) |shuffle(transpose(arpeggio(((X|X) +transpose(step(X,12) ,12) ) ) ,-7) ) ) ,-5) ,12) ) ,4,6) ,-5) +transpose(arpeggio(arpeggio((transpose((shuffle(transpose(X,-5) ) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,-7) ) ,-7) +transpose(step((arpeggio(step(X,12) ) +transpose((echo(X,4,6) |step(X,12) ) ,7) ) ,12) ,7) ) ) ) ,7) ) +transpose((arpeggio(echo((transpose((X+transpose(X,12) ) ,-7) |echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4,6) ) ,4,6) ) |shuffle(echo(transpose(step((step(((shuffle(arpeggio(X) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,12) |(echo(X,4,6) +transpose((step(X,12) +(X+transpose(transpose(X,4) ,7) ) ) ,7) ) ) ,12) ,4) ,4,6) ) ) ,4) ) +transpose(echo((((transpose(shuffle(((transpose(((arpeggio(X) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose((X|X) ,7) ) ,-7) +transpose(((X+transpose(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(shuffle(((X+transpose((step(X,12) +transpose(X,7) ) ,4) ) +transpose(((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ) ,7) ) ) ,-7) +step(step(step(arpeggio(echo(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4,6) ) ,12) ,12) ,12) ) +transpose(((echo(shuffle(step(X,12) ) ,4,6) +transpose((((step(X,12) |X) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) +transpose((transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,12) ) +transpose(((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((transpose((X+X) ,-7) +transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) +transpose((X+transpose(shuffle(X) ,12) ) ,7) ) ,7) ) +transpose(step(X,12) ,12) ) ,7) ) ,12) ) +transpose((((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(arpeggio(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) ,7) ) +(arpeggio(((X+transpose(arpeggio((X|X) ) ,7) ) +transpose(arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,12) ) ) |shuffle(transpose(echo(X,4,6) ,-5) ) ) ) +transpose((arpeggio(transpose(((shuffle(shuffle(shuffle(X) ) ) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose((X+transpose((arpeggio(X) +transpose(shuffle(X) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(step((arpeggio((shuffle(((transpose(X,-7) |(X+transpose(X,7) ) ) +transpose(X,12) ) ) +transpose((transpose(X,4) |transpose(arpeggio(X) ,-5) ) ,12) ) ) +transpose(((X+transpose((X+transpose(X,7) ) ,7) ) +transpose((arpeggio(X) +transpose(X,12) ) ,12) ) ,12) ) ,12) ,7) ) ,4) ) +transpose(arpeggio(transpose(transpose(shuffle((step((X|X) ,12) |(X+transpose(arpeggio(X) ,7) ) ) ) ,-7) ,4) ) ,7) ) +shuffle(transpose((step(echo(arpeggio(X) ,4,6) ,12) |(echo(X,4,6) +echo(X,4,6) ) ) ,4) ) ) ,12) ) ,4) ) +transpose(shuffle(((((echo(shuffle((transpose((X+transpose(X,7) ) ,-5) +((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ) ) ,4,6) |transpose(echo(X,4,6) ,-5) ) +(shuffle(arpeggio((((step(echo(X,4,6) ,12) +(X|X) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +step(X,12) ) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose(X,7) ) ) ) +transpose(shuffle(arpeggio((X+transpose((X+X) ,12) ) ) ) ,4) ) ) +transpose(shuffle(step((transpose(X,4) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,12) ) ,7) ) +transpose(((transpose(((shuffle(transpose(X,-5) ) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) ) ,4) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,-5) +transpose((((X+transpose(X,12) ) +echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) ) +transpose(arpeggio(arpeggio((arpeggio((X+transpose(X,7) ) ) +transpose(step(X,12) ,7) ) ) ) ,12) ) ,7) ) |(((shuffle(echo(X,4,6) ) +transpose(((X|X) +transpose(X,7) ) ,12) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) |(((transpose(X,-5) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(transpose(step(X,12) ,-5) ,7) ) ) ) ,12) ) ) ,7) ) ,4,6) ,7) ) ,12) ,12) ) +transpose(echo((shuffle(arpeggio((((echo(transpose((X+transpose(X,7) ) ,4) ,4,6) +transpose(((echo((X+X) ,4,6) +transpose(((X+transpose(X,7) ) +transpose(X,-5) ) ,7) ) +transpose(arpeggio(((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ,7) ) |(((echo(X,4,6) +(X+transpose(X,12) ) ) +((X|X) |(X+transpose(X,7) ) ) ) +(step(arpeggio(X) ,12) +step(echo(transpose(X,4) ,4,6) ,12) ) ) ) +arpeggio(arpeggio((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ) ) ) ) ) +transpose(arpeggio(step(arpeggio(((shuffle((X+transpose((X+X) ,12) ) ) +transpose(step((X+transpose(transpose(X,4) ,12) ) ,12) ,4) ) +transpose((X|arpeggio(X) ) ,7) ) ) ,12) ) ,12) ) ,4,6) ,4) ) +transpose(transpose(shuffle(transpose(step((step((echo(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(shuffle(echo(X,4,6) ) ,12) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) |echo(arpeggio(X) ,4,6) ) +transpose(transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ,4) ) +transpose(transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,7) ) ,7) ) ,12) +transpose((((transpose(X,-5) +X) +transpose(transpose(transpose(transpose(transpose(step(X,12) ,-7) ,4) ,-7) ,4) ,4) ) +transpose(((((transpose(echo(X,4,6) ,-7) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(echo(echo(shuffle(X) ,4,6) ,4,6) ,12) ) |arpeggio(step(step(step(X,12) ,12) ,12) ) ) ,7) ) ,12) ) ,12) ,-7) ) ,4) ,7) ) random seed used was 241955229

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