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 15 generations the expression "X" became this: (arpeggio(echo(echo(transpose((shuffle(((((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(echo(step(transpose(X,4) ,12) ,4,6) ,7) ) ) |((((shuffle(transpose(step(X,12) ,-5) ) +transpose(transpose((transpose(X,4) +X) ,4) ,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((echo(((arpeggio(X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) |shuffle(((shuffle((X+transpose(X,7) ) ) +transpose(step(step(X,12) ,12) ,12) ) +transpose((transpose(X,4) +transpose((transpose(X,4) +transpose((echo(X,4,6) +transpose(echo(X,4,6) ,7) ) ,7) ) ,7) ) ,12) ) ) ) ,4) ) +transpose((transpose(shuffle(X) ,-7) +transpose(step(transpose((step(X,12) +(X+transpose(X,7) ) ) ,4) ,12) ,12) ) ,7) ) ) ,4) ,4,6) ,4,6) ) +transpose(transpose(((echo((shuffle(arpeggio((shuffle(X) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ) ) +transpose(transpose(transpose(shuffle(shuffle(echo(step(step(X,12) ,12) ,4,6) ) ) ,4) ,4) ,12) ) ,4,6) +transpose(((transpose(transpose((transpose(((X|X) +X) ,-5) |transpose(transpose(echo(X,4,6) ,-5) ,-5) ) ,-7) ,-7) +transpose((echo(shuffle((X|transpose(X,-5) ) ) ,4,6) +(arpeggio(arpeggio(transpose((X+transpose(X,7) ) ,-5) ) ) +step(X,12) ) ) ,4) ) +transpose(shuffle(step((X|X) ,12) ) ,7) ) ,7) ) |((transpose(shuffle((shuffle((echo(X,4,6) +transpose(shuffle(step(X,12) ) ,7) ) ) |((((echo(X,4,6) +transpose(arpeggio(X) ,7) ) +transpose(transpose(step(X,12) ,-5) ,7) ) +transpose(echo((arpeggio(X) +transpose(transpose(X,4) ,7) ) ,4,6) ,4) ) +transpose(transpose(((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,4) ,7) ) ) ) ,-7) +transpose((((transpose(X,4) +transpose(transpose((echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) +transpose(step((step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) +transpose(((((X+transpose(X,12) ) +X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,12) ) ,12) ,7) ) ,4) ,4) ) +transpose(((shuffle(X) +transpose((((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) +shuffle(X) ) ,7) ) +transpose(shuffle(X) ,7) ) ,7) ) +transpose(transpose((transpose(shuffle(shuffle(step(X,12) ) ) ,-5) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,-7) ,7) ) ,4) ) +transpose((arpeggio(arpeggio(((transpose((X|X) ,4) +transpose((((transpose(X,4) +step(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(((X+X) +X) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) +arpeggio(transpose((arpeggio(X) |shuffle(X) ) ,-7) ) ) ,7) ) ) ,4) ,7) ) random seed used was 6 EXPR = shuffle((((((step(transpose(step((transpose(shuffle(X) ,4) |(X|X) ) ,12) ,4) ,12) +transpose((echo((step(((X|X) +transpose(shuffle(shuffle(X) ) ,12) ) ,12) +transpose(shuffle(X) ,12) ) ,4,6) |(transpose(X,4) |(transpose((X|X) ,4) +transpose(((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,7) ) ) ) ,12) ) +transpose((((transpose((shuffle(X) |X) ,4) |((echo((X+transpose(X,7) ) ,4,6) +transpose(((((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(transpose(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,4) ,7) ) ) +transpose(((transpose(arpeggio(shuffle(X) ) ,4) +transpose(shuffle(((step(X,12) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) |step((echo((X+transpose(X,7) ) ,4,6) |shuffle(arpeggio(X) ) ) ,12) ) ) ,4) ) +transpose(arpeggio(((transpose((X+X) ,-7) +transpose(arpeggio(((X|X) +transpose(X,12) ) ) ,4) ) +transpose(shuffle((step(X,12) +(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) ) ,7) ) ) ,7) ) ,4) ) +transpose(transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) ,-7) ,7) ) ,4) ) +transpose(echo(transpose(transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,-5) ,-7) ,4,6) ,7) ) +transpose(transpose(arpeggio((((((((X+transpose((X+transpose(step(X,12) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(arpeggio(transpose(X,-7) ) ,12) ) +transpose((arpeggio(X) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(transpose(step(transpose(X,4) ,12) ,-7) ,7) ) +transpose(echo((arpeggio(arpeggio(((X+X) |X) ) ) +transpose(echo((shuffle(X) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,4,6) ,7) ) ,4,6) ,4) ) +transpose(echo(echo((transpose(step(X,12) ,-7) +transpose(X,7) ) ,4,6) ,4,6) ,7) ) ) ,4) ,7) ) |((echo(echo(transpose((arpeggio(X) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,-5) ,4,6) ,4,6) |(echo(echo((((transpose(X,-5) +transpose(transpose(transpose(X,-7) ,4) ,7) ) +shuffle(X) ) +transpose(shuffle(arpeggio((arpeggio(X) +transpose(echo(X,4,6) ,7) ) ) ) ,7) ) ,4,6) ,4,6) +transpose(((arpeggio((X|X) ) +transpose(arpeggio(X) ,7) ) +transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,7) ) ) +transpose((step((echo((((X+transpose(X,7) ) +transpose((echo(X,4,6) |transpose(X,-5) ) ,4) ) +transpose(transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ,7) ) ,4,6) +echo(step(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,12) ,4,6) ) ,12) +transpose(step((step((echo(transpose(X,-7) ,4,6) |X) ,12) +transpose(arpeggio(((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose(step((X+transpose(X,7) ) ,12) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(((arpeggio(transpose(X,4) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) +echo((((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,4,6) ) +transpose(transpose((step((step(X,12) +transpose(X,7) ) ,12) +transpose((((transpose((X+transpose(X,7) ) ,-7) |(X+X) ) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,-5) ,7) ) ) ,7) ) ,12) ,12) ) ,7) ) ) ) random seed used was 0 EXPR = echo((((((step(arpeggio(((arpeggio(((X+transpose(((X+transpose(arpeggio(X) ,4) ) +transpose((X+X) ,7) ) ,7) ) +transpose((shuffle(X) |(X|transpose(X,-7) ) ) ,12) ) ) +transpose((transpose(transpose(transpose((transpose(X,4) +transpose(X,7) ) ,4) ,4) ,-5) +((((X+transpose(X,-7) ) |shuffle(X) ) +transpose((step(step(X,12) ,12) +echo((X|X) ,4,6) ) ,7) ) |(arpeggio((X+transpose(X,12) ) ) +transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ) ,4) ) +transpose((step(echo(X,4,6) ,12) +transpose(step(transpose(X,-5) ,12) ,7) ) ,7) ) ) ,12) +transpose(((step(echo((echo((X+transpose(X,7) ) ,4,6) +transpose(((X+transpose(((step(X,12) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) ,7) ) ,4,6) ,12) +transpose(arpeggio(step(transpose(transpose((((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +(X+X) ) ,-7) ,-5) ,12) ) ,4) ) +transpose(((transpose((shuffle((((X|X) +transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ) +transpose(((((transpose(echo(transpose(X,-7) ,4,6) ,-7) +transpose((echo(step(X,12) ,4,6) +transpose(shuffle((echo(X,4,6) +transpose(shuffle((X|X) ) ,12) ) ) ,7) ) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,12) ) |transpose((X+X) ,-5) ) ,7) ) +transpose(transpose(arpeggio(X) ,-5) ,4) ) +transpose(transpose(arpeggio(transpose(X,-5) ) ,4) ,7) ) ,7) ) ,-5) +transpose(shuffle(step(((echo(echo((X+transpose(X,12) ) ,4,6) ,4,6) |((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) +transpose(step(arpeggio(X) ,12) ,7) ) ) +transpose((transpose(X,-5) +(((((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(transpose((X|X) ,4) ,12) ) +transpose(X,4) ) +transpose(transpose(((transpose(X,4) +transpose(X,4) ) +transpose((X+X) ,7) ) ,-5) ,7) ) ) ,7) ) ,12) ) ,4) ) +transpose(arpeggio((transpose((((((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |((transpose(X,4) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ) +transpose(((step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ,12) +transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) ,4) ) +transpose((shuffle(X) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,7) ) ,7) ) ,4) +transpose(((((X|X) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) |shuffle((X+transpose(X,7) ) ) ) ,7) ) +transpose(((X+transpose(transpose((X+X) ,-5) ,4) ) +transpose(((shuffle(X) +transpose(X,7) ) |((X+transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ,7) ) ,7) ) ) ,7) ) ,7) ) ,4) ) +transpose(((transpose((X+transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,4) +transpose(echo(echo(step(X,12) ,4,6) ,4,6) ,7) ) +transpose(((step((arpeggio((X+transpose(X,7) ) ) +transpose(step(transpose(step(X,12) ,-7) ,12) ,12) ) ,12) +transpose((((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(echo(transpose(X,-7) ,4,6) ,4) ,7) ) +transpose((echo(X,4,6) +(shuffle(step(transpose(X,-7) ,12) ) +transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(echo(step(X,12) ,4,6) ,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) |(arpeggio(((step((X+transpose(X,7) ) ,12) +transpose(transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ,4) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,-5) ) ) ,4) ) +transpose((((step(shuffle(X) ,12) +transpose(arpeggio(((X+X) +transpose(X,12) ) ) ,4) ) +transpose(arpeggio(((arpeggio(X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) ,7) ) |(echo(step((X|X) ,12) ,4,6) +transpose(((((X|transpose(X,-5) ) +transpose(X,12) ) +transpose(((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,7) ) ) ,7) ) ,7) ) ,7) ) +transpose(((step(step(((((arpeggio(X) +(X|X) ) +transpose(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(echo(transpose(X,4) ,4,6) ,-5) ,7) ) +(X+transpose((X+transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ) ,12) ,12) |step(transpose((((transpose(transpose((X+transpose(X,7) ) ,4) ,4) +transpose(arpeggio(X) ,-5) ) +transpose(((shuffle(X) +transpose(echo(X,4,6) ,7) ) +transpose(((((arpeggio(X) +transpose((X|X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((transpose(X,-7) +shuffle(X) ) ,4) ) +transpose((X+transpose(arpeggio(X) ,7) ) ,7) ) ,12) ) ,4) ) +transpose(X,7) ) ,-7) ,12) ) +transpose(step(transpose((arpeggio(X) +((step(((echo((X|X) ,4,6) +transpose((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,7) ) +transpose(((X+X) |step(X,12) ) ,7) ) ,12) +transpose(((step((echo(X,4,6) +transpose(X,-5) ) ,12) +transpose((((X|X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) |transpose(transpose(X,4) ,4) ) ,4) ) +transpose(transpose(echo(arpeggio(transpose((X+transpose(X,7) ) ,-7) ) ,4,6) ,-5) ,7) ) ) ,-7) ,12) ,7) ) ,4) ) +transpose(((step(((transpose(arpeggio(((((X+transpose(X,4) ) +transpose((X|X) ,7) ) +(X+transpose(X,7) ) ) +step(transpose((X+transpose(X,12) ) ,-5) ,12) ) ) ,4) +transpose(((arpeggio(arpeggio(((X|X) +(X+transpose(X,7) ) ) ) ) +transpose(shuffle(echo(X,4,6) ) ,4) ) +transpose(transpose(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) ,-7) ,7) ) ,7) ) +transpose((transpose((transpose(((((echo(X,4,6) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) +transpose(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ,12) ) ,-5) +transpose((shuffle((((step(X,12) +X) |shuffle(echo(X,4,6) ) ) +transpose((X+X) ,7) ) ) +transpose(echo(shuffle((((X+transpose(step(X,12) ,7) ) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ) ,4,6) ,12) ) ,12) ) ,7) ) ,12) +transpose((transpose(echo(shuffle(arpeggio(transpose(((X+transpose(X,7) ) |echo(X,4,6) ) ,-7) ) ) ,4,6) ,4) +step(((step(((shuffle(X) +transpose(arpeggio(step(transpose(arpeggio(X) ,-7) ,12) ) ,4) ) +transpose(step(((X|X) +transpose(X,7) ) ,12) ,7) ) ,12) +transpose(echo(transpose((X|X) ,-7) ,4,6) ,4) ) +transpose(shuffle(step((transpose((X+transpose(X,12) ) ,4) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) ,12) ) ,7) ) ,12) ) ,7) ) +step(shuffle((echo(X,4,6) |(X+X) ) ) ,12) ) ,7) ) +transpose(arpeggio(transpose(((step((((arpeggio(X) +transpose(echo((X|X) ,4,6) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) +transpose((echo(echo(X,4,6) ,4,6) +transpose(shuffle(X) ,7) ) ,7) ) ,12) +transpose(((((shuffle(transpose((transpose(X,4) |transpose(X,4) ) ,4) ) |shuffle(echo(X,4,6) ) ) +transpose(((transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-7) +transpose(echo(echo(X,4,6) ,4,6) ,4) ) +transpose(transpose(echo(arpeggio(X) ,4,6) ,-7) ,7) ) ,12) ) +transpose(echo(transpose((transpose((X+X) ,-5) +transpose(echo(transpose((X+X) ,-5) ,4,6) ,7) ) ,4) ,4,6) ,4) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) |((X+transpose(X,7) ) |X) ) |echo(shuffle(((echo(X,4,6) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ) ,4,6) ) ,7) ) ,4) ) +transpose(arpeggio((shuffle(step(X,12) ) +transpose((step(X,12) +arpeggio(echo(X,4,6) ) ) ,7) ) ) ,7) ) ,4) ) ,7) ) ,4,6) random seed used was 0 EXPR = arpeggio(((transpose(transpose((echo(shuffle(X) ,4,6) +transpose(transpose(X,-7) ,7) ) ,-5) ,4) +transpose((((((arpeggio((X+transpose(X,7) ) ) +transpose(step(arpeggio(X) ,12) ,4) ) +transpose((step(arpeggio(X) ,12) +echo(X,4,6) ) ,7) ) +transpose((echo(arpeggio(X) ,4,6) +transpose(transpose(X,-7) ,7) ) ,7) ) +transpose(transpose((((X+X) +transpose(X,7) ) |echo((X+transpose(echo(X,4,6) ,12) ) ,4,6) ) ,-5) ,7) ) +transpose(arpeggio((shuffle((transpose(transpose(step(X,12) ,-7) ,-7) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ) +(arpeggio((X+(X+transpose(X,7) ) ) ) +transpose(((shuffle(transpose(X,-5) ) +transpose(((((X+X) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,7) ) |(X+X) ) ,7) ) ) ) ,7) ) ,4) ) +transpose(transpose(step((transpose(((X+X) |X) ,4) |arpeggio(step(X,12) ) ) ,12) ,4) ,7) ) ) random seed used was 0

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