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 14 generations the expression "X" became this: (transpose(transpose(transpose(transpose(shuffle(echo(echo(arpeggio(((step(X,12) +(X+transpose(X,7) ) ) +transpose(X,12) ) ) ,4,6) ,4,6) ) ,4) ,4) ,4) ,-7) +echo(((((arpeggio(transpose((shuffle(transpose(X,4) ) +transpose(transpose(X,-5) ,12) ) ,4) ) |(((X|X) |X) +transpose(transpose(shuffle((X+transpose((X+transpose(X,12) ) ,12) ) ) ,4) ,7) ) ) +arpeggio((echo(((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ,4,6) +transpose((((X|transpose((transpose((X+transpose(X,7) ) ,-5) +transpose(echo(step(X,12) ,4,6) ,12) ) ,4) ) +transpose(transpose((X|X) ,-5) ,4) ) +transpose((((X|X) +X) +step((X+transpose(echo(X,4,6) ,12) ) ,12) ) ,7) ) ,12) ) ) ) +transpose((((transpose(step(transpose(X,-5) ,12) ,-7) |echo(transpose(step(echo(X,4,6) ,12) ,-7) ,4,6) ) +arpeggio(((X+transpose(transpose(step((X|X) ,12) ,4) ,4) ) +transpose((transpose(X,-7) +transpose((X|X) ,7) ) ,7) ) ) ) |(transpose((((X+transpose(X,12) ) |echo(X,4,6) ) +arpeggio((X+X) ) ) ,-7) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,-7) ,7) ) ) ,4) ) +transpose(echo((((transpose(((X|X) +transpose(transpose(transpose(X,4) ,-5) ,-7) ) ,-7) +transpose((((transpose((echo(transpose(X,4) ,4,6) +transpose(echo(X,4,6) ,12) ) ,4) |((transpose(X,-5) +(X+X) ) |(X+transpose((X+X) ,12) ) ) ) +transpose(shuffle((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose(transpose(((X+transpose(transpose(X,4) ,12) ) +(X+transpose(transpose(step(X,12) ,-5) ,7) ) ) ,4) ,7) ) ,12) ) +transpose((((shuffle(((X+X) +transpose(X,7) ) ) +transpose((transpose(step(X,12) ,-5) +transpose(echo((((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +step(step(X,12) ,12) ) ,4,6) ,12) ) ,4) ) +transpose(arpeggio(transpose(transpose(step(transpose(X,-7) ,12) ,4) ,-7) ) ,7) ) |shuffle(transpose(((((((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) +transpose(transpose((X+X) ,4) ,12) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) +transpose(X,12) ) ,-5) ) ) ,4) ) +transpose((transpose((step((X+X) ,12) +transpose((X|X) ,-7) ) ,-7) +transpose((transpose((echo(shuffle(X) ,4,6) +(X|arpeggio(X) ) ) ,-5) +transpose((transpose(transpose(X,4) ,-5) +transpose((echo(X,4,6) +transpose(X,4) ) ,7) ) ,12) ) ,12) ) ,7) ) ,4,6) ,7) ) ,4,6) ) random seed used was 6 NOTE: Generated phrase was too large ( 7635 ) , it has been truncated at 5000 notes. EXPR = ((((transpose(((transpose(echo(((echo(transpose(arpeggio(X) ,-5) ,4,6) +transpose((X+transpose(arpeggio(X) ,7) ) ,-5) ) |(((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) +transpose(echo(((X+X) +X) ,4,6) ,7) ) ) ,4,6) ,-5) +transpose(shuffle(transpose(shuffle(((((X|transpose(X,-7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) |arpeggio(((X+transpose(X,7) ) |X) ) ) +transpose(transpose(((X|X) +X) ,-7) ,12) ) ) ,4) ) ,4) ) +transpose(((step(((X+transpose((X+X) ,7) ) +transpose(X,-7) ) ,12) +(((((echo(transpose(X,-5) ,4,6) |(transpose(X,-5) |(X+transpose(X,7) ) ) ) |transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) ,-5) ) +transpose((((X|X) +transpose((X+X) ,4) ) +transpose(((transpose(transpose(X,-7) ,-5) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,4) ) +transpose(((X+transpose(transpose(X,-7) ,12) ) |(X|(X|X) ) ) ,4) ) +transpose(transpose((transpose(X,-7) +transpose(X,-5) ) ,-7) ,7) ) ) |transpose(echo(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ,-7) ) ,7) ) ,-5) +transpose(transpose((transpose(transpose(((transpose(((((X+shuffle(X) ) +transpose((X|X) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) |(X|X) ) ,4) +transpose(step(transpose((step(X,12) +transpose((transpose(X,-5) +transpose(X,12) ) ,12) ) ,4) ,12) ,4) ) +transpose((((transpose((X+X) ,-7) +(((X+transpose(X,4) ) +transpose(X,7) ) +X) ) +transpose(echo((X|X) ,4,6) ,12) ) +(X|echo((transpose(X,4) +arpeggio((X+X) ) ) ,4,6) ) ) ,7) ) ,-5) ,4) +(transpose(((((shuffle(X) +echo(X,4,6) ) |((X+X) +transpose((X+X) ,7) ) ) +transpose((X+transpose((((X+X) |(X+transpose(X,7) ) ) +(X|X) ) ,12) ) ,4) ) +transpose((arpeggio(transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,12) ) ,7) ) ,-7) |arpeggio(transpose(shuffle(transpose(((X+transpose(X,12) ) +X) ,-5) ) ,4) ) ) ) ,4) ,12) ) +transpose(transpose(((((transpose(transpose(X,4) ,4) +transpose(transpose(echo((((X+transpose(X,4) ) |(X+X) ) |(transpose(X,4) +transpose((X|X) ,-5) ) ) ,4,6) ,4) ,4) ) +transpose(arpeggio(transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ,-5) ) ,7) ) +echo((((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,4) ) +transpose((X|X) ,7) ) +transpose(transpose(X,-5) ,7) ) +transpose(((transpose(step(X,12) ,-5) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) +(transpose(echo(X,4,6) ,-5) +(transpose(X,-5) +(transpose(X,4) +transpose(X,12) ) ) ) ) +((step((X+X) ,12) +transpose((X|echo(X,4,6) ) ,4) ) +transpose(((transpose(echo(X,4,6) ,-7) +(X|transpose(X,-5) ) ) +X) ,7) ) ) ,4,6) ) +transpose(((transpose(transpose((transpose(X,-5) +transpose(X,4) ) ,4) ,4) +transpose((((((X|X) |(X|X) ) +transpose(transpose(shuffle(X) ,-5) ,12) ) |arpeggio(transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) ) ) +echo(echo(shuffle(X) ,4,6) ,4,6) ) ,12) ) +transpose((arpeggio(echo(X,4,6) ) +transpose(transpose(X,4) ,12) ) ,-7) ) ,7) ) ,-5) ,4) ) +transpose((echo(transpose(transpose(transpose((((X+X) |((X+X) +echo(X,4,6) ) ) +transpose(((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(X,-7) ,7) ) ,4) ) ,-5) ,4) ,-5) ,4,6) |((arpeggio(((((X+transpose(X,12) ) +transpose(arpeggio(X) ,-5) ) +transpose((echo(X,4,6) |(transpose(X,-5) +transpose((X+X) ,7) ) ) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(X,-7) ) +step(X,12) ) ,7) ) ) +transpose(((shuffle(transpose(X,-7) ) +transpose((shuffle(transpose(arpeggio(transpose(transpose(X,-5) ,4) ) ,-7) ) +(transpose((arpeggio(X) |shuffle(X) ) ,-7) +transpose(transpose(arpeggio(X) ,4) ,7) ) ) ,7) ) +echo((X|X) ,4,6) ) ,4) ) +transpose(((((transpose((X+X) ,-7) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,4) ) +transpose((((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) |(transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) |transpose(((X+transpose(X,7) ) +(X+X) ) ,4) ) ) +(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-5) +transpose((echo(X,4,6) +(((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) ) ,7) ) ) ,7) ) ) ,7) ) |(((transpose(shuffle(transpose(step(transpose((transpose(X,-7) +echo(X,4,6) ) ,-5) ,12) ,4) ) ,-7) +transpose(((transpose(transpose(transpose(step(((X+X) +transpose(X,4) ) ,12) ,-7) ,-5) ,4) |transpose(transpose((echo(((X|X) +X) ,4,6) +transpose(((X+X) +transpose((X|transpose(X,-5) ) ,12) ) ,12) ) ,-7) ,4) ) |((shuffle(transpose(X,4) ) +(X+shuffle(X) ) ) +transpose(arpeggio(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) ,12) ) ) ,4) ) +transpose(transpose(((step(transpose(step(X,12) ,-7) ,12) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose(shuffle(transpose(((transpose(X,4) |(X+X) ) |((transpose(X,-5) +step(X,12) ) |(shuffle(X) +transpose(X,7) ) ) ) ,4) ) ,7) ) ,-7) ,7) ) +transpose(echo((((echo((shuffle(arpeggio(step(X,12) ) ) +transpose(((X|X) +(X|(X+X) ) ) ,4) ) ,4,6) +transpose(step((echo(echo(X,4,6) ,4,6) |(X|X) ) ,12) ,4) ) +transpose(transpose((echo(X,4,6) |((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(X,4) ) ) ,-7) ,7) ) +transpose(transpose(transpose(((((X|transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) +(transpose(X,4) |(X+transpose(X,12) ) ) ) +((X+transpose(X,-5) ) +shuffle((shuffle(X) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ) ) ) +transpose((transpose(transpose(((arpeggio(X) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ,-5) +(((X|X) +transpose((transpose(X,-5) +transpose(echo(X,4,6) ,-7) ) ,4) ) +transpose(transpose((step(transpose(X,4) ,12) +transpose(((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,-7) ,7) ) ) ,-5) ) ,4) ,-5) ,12) ) ,4,6) ,12) ) ) random seed used was 0 EXPR = transpose(shuffle(step((echo((transpose(X,-5) |transpose((X|echo(X,4,6) ) ,-5) ) ,4,6) +transpose(step((arpeggio(transpose(X,4) ) +(transpose((X+transpose(X,12) ) ,4) +(transpose((transpose(echo(X,4,6) ,-5) |transpose(X,4) ) ,-7) +(arpeggio(X) +transpose(((echo(X,4,6) +transpose(arpeggio(X) ,4) ) +transpose(((step(X,12) +transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) ,7) ) ,7) ) ) ) ) ,12) ,7) ) ,12) ) ,-7) random seed used was 0 EXPR = (((transpose((transpose(step((((X+X) |arpeggio(X) ) |echo((X+X) ,4,6) ) ,12) ,4) |(((transpose(arpeggio(transpose(X,-7) ) ,-5) +(((X|transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,4) ) +transpose(step((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ,7) ) ) |((X+transpose(echo(X,4,6) ,7) ) |(transpose(transpose(X,4) ,4) |step((X+transpose(X,7) ) ,12) ) ) ) +transpose((transpose(((X+transpose(X,12) ) |transpose((X|X) ,-7) ) ,-7) +transpose(transpose((step(X,12) +transpose((X|X) ,7) ) ,-7) ,-7) ) ,12) ) ) ,-5) +transpose(transpose(transpose(shuffle((echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) ) ,-7) ,4) ,4) ) +transpose((step(transpose(((X|arpeggio((X|X) ) ) |(echo(transpose(X,-7) ,4,6) +transpose(X,7) ) ) ,-7) ,12) +transpose((transpose(transpose((X+transpose(arpeggio(transpose(X,-7) ) ,12) ) ,4) ,-5) |((X+transpose(X,12) ) +transpose((X|X) ,12) ) ) ,7) ) ,7) ) +(transpose(((((step((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ) ,12) +transpose(((shuffle(transpose(X,-5) ) |transpose((X+X) ,4) ) +transpose(echo((((X+(X+transpose(X,7) ) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) ,12) ) ,7) ) +((transpose(step((X+transpose(X,4) ) ,12) ,-5) |transpose((arpeggio(step(X,12) ) +transpose((transpose(X,-5) +(shuffle(X) +transpose(X,12) ) ) ,12) ) ,-5) ) |transpose((((X+X) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,4) ) ) +transpose((transpose(transpose((((X+X) +transpose(X,12) ) |(((X+transpose(arpeggio(X) ,4) ) +transpose((X|X) ,7) ) |(transpose(X,-5) |X) ) ) ,4) ,4) |(transpose((X+X) ,4) +transpose(((X|X) +transpose(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) ,-5) ) |(transpose(echo(transpose(arpeggio((echo(X,4,6) +transpose(echo(X,4,6) ,4) ) ) ,-7) ,4,6) ,-5) +transpose((((X+transpose(X,7) ) |(transpose(echo(X,4,6) ,4) |transpose(arpeggio(transpose(X,-7) ) ,4) ) ) |((((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,7) ) +(X|(X+transpose(X,12) ) ) ) +transpose(((((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ,12) ) ) ,7) ) ) ,-5) |transpose(echo((shuffle(X) +transpose(step((echo(X,4,6) |X) ,12) ,7) ) ,4,6) ,-7) ) ) random seed used was 0

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