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 16 generations the expression "X" became this: step(transpose(shuffle(echo(echo((transpose(((X+transpose(transpose((X|X) ,-7) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,-7) +transpose((arpeggio(((X+X) +transpose(step((X+transpose((X|X) ,-7) ) ,12) ,12) ) ) +transpose(echo(echo(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,4,6) ,4,6) ,12) ) ,12) ) ,4,6) ,4,6) ) ,-5) ,12) random seed used was 10 NOTE: Generated phrase was too large ( 8325 ) , it has been truncated at 5000 notes. EXPR = (((echo((transpose(step(arpeggio((X+transpose(X,7) ) ) ,12) ,-5) +transpose(transpose(transpose(((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) ,-7) ,-7) ,12) ) ,4,6) +transpose((((transpose(echo(X,4,6) ,-7) +transpose((transpose(transpose(shuffle(X) ,-7) ,-7) +transpose(((X+X) +transpose(transpose(X,-7) ,7) ) ,7) ) ,12) ) +transpose(((echo(((X+transpose(X,7) ) +transpose((step(X,12) +transpose(arpeggio(echo(X,4,6) ) ,12) ) ,7) ) ,4,6) +transpose(step(echo(transpose(transpose(X,-5) ,-7) ,4,6) ,12) ,4) ) +transpose(echo(shuffle((step(X,12) +echo(transpose(X,-7) ,4,6) ) ) ,4,6) ,7) ) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ,-5) ) +transpose((transpose(arpeggio((((transpose(step(X,12) ,-7) +transpose(step((transpose((transpose(step(X,12) ,-7) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,-7) +transpose(step(arpeggio((X+X) ) ,12) ,7) ) ,12) ,4) ) +transpose(((step(X,12) +transpose(transpose((((X+transpose((X|X) ,4) ) +transpose((X|X) ,7) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ,-5) ,4) ) +transpose(shuffle((arpeggio(transpose(transpose(X,4) ,-7) ) |(((transpose(X,-7) +transpose(X,4) ) +transpose((X|X) ,7) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,12) ) ) ) ,7) ) ,7) ) +transpose(((shuffle(transpose(X,-7) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,12) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(shuffle((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) ,12) ) +transpose(((arpeggio(((X+transpose((X+transpose(X,7) ) ,7) ) +transpose((X+transpose(X,12) ) ,12) ) ) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose(transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ,4) ,7) ) ,7) ) ,-5) ) ) ,-7) +transpose(step(step((transpose(transpose(shuffle((transpose(arpeggio(((X+transpose(X,7) ) +transpose(X,7) ) ) ,-7) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ) ,-5) ,-7) +transpose((transpose(((echo(transpose(X,-7) ,4,6) +transpose(arpeggio((shuffle(X) +transpose(X,7) ) ) ,7) ) +transpose(transpose((transpose(X,4) |X) ,-7) ,12) ) ,4) +transpose((shuffle(X) +transpose(shuffle((shuffle(echo(arpeggio(X) ,4,6) ) +transpose(((X+transpose(X,7) ) |echo(X,4,6) ) ,7) ) ) ,12) ) ,7) ) ,-5) ) ,12) ,12) ,12) ) ,4) ) +transpose(step(transpose(shuffle(echo(echo(shuffle(transpose(arpeggio(X) ,-7) ) ,4,6) ,4,6) ) ,4) ,12) ,7) ) random seed used was 0 EXPR = (((transpose(shuffle((((transpose(transpose(transpose((X+X) ,-7) ,4) ,-7) +transpose(((((X+shuffle(X) ) +transpose(((transpose(transpose(X,-7) ,-5) +transpose(((X+X) +transpose(shuffle(X) ,12) ) ,4) ) +transpose((X+transpose((X+X) ,7) ) ,7) ) ,4) ) +transpose(shuffle(((shuffle(transpose(X,-5) ) +transpose(transpose(X,-7) ,4) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) ) ,7) ) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose((shuffle(transpose((arpeggio((X+transpose(X,7) ) ) +transpose(X,7) ) ,4) ) +transpose((((((transpose(X,-7) |arpeggio(X) ) +transpose(echo(X,4,6) ,12) ) +transpose(((shuffle(X) |(((X+transpose(X,4) ) +transpose(X,7) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) ) +shuffle((X+transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,7) ) ) ) ,12) ) +transpose(transpose((transpose(shuffle(X) ,-7) +transpose(shuffle((X+X) ) ,12) ) ,4) ,4) ) +transpose(shuffle((X+transpose((X+X) ,7) ) ) ,7) ) ,7) ) ,7) ) |echo(arpeggio(shuffle(step(echo((transpose(step(X,12) ,4) +transpose(transpose(X,4) ,12) ) ,4,6) ,12) ) ) ,4,6) ) ) ,-7) +transpose((((((transpose(((((transpose(transpose(transpose(X,-7) ,-5) ,4) +transpose(step(arpeggio(shuffle(X) ) ,12) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) +transpose(arpeggio(step((X+shuffle(X) ) ,12) ) ,12) ) +transpose(((X+transpose((X+transpose(X,12) ) ,12) ) |echo(transpose(X,-7) ,4,6) ) ,12) ) ,4) +transpose(((transpose((transpose((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,-7) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ,-5) +((X|(X+transpose(X,7) ) ) +transpose(echo(X,4,6) ,7) ) ) +transpose(step((step(step((transpose(X,-7) +transpose(arpeggio(X) ,-7) ) ,12) ,12) +transpose((echo((step(X,12) |X) ,4,6) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) ,12) ,12) ) ,4) ) +transpose(echo((arpeggio((X|X) ) |((transpose(X,4) +transpose(transpose(X,4) ,7) ) |(X+arpeggio(X) ) ) ) ,4,6) ,7) ) +transpose(echo(((((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,-7) +transpose(X,7) ) +transpose((arpeggio(transpose(transpose((X+X) ,4) ,-7) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(shuffle((X+echo(X,4,6) ) ) ,7) ) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ,4,6) ,7) ) +(((transpose(transpose(step(transpose(((X|X) +(transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ) ,-7) ,12) ,-7) ,4) +transpose(transpose((step(shuffle(arpeggio(X) ) ,12) +((((((X+transpose(transpose(X,-7) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4) ,7) ) +transpose((((echo(arpeggio((X+transpose(X,7) ) ) ,4,6) +transpose(step(transpose(shuffle(transpose(X,-7) ) ,-5) ,12) ,7) ) +transpose(transpose(transpose((shuffle((echo(transpose(X,-7) ,4,6) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) ) +transpose(transpose(echo(transpose((X+X) ,4) ,4,6) ,-5) ,7) ) ,-7) ,4) ,7) ) +transpose(step(transpose((echo((X|X) ,4,6) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,-5) ,12) ,12) ) ,4) ) +transpose((transpose(shuffle((transpose((transpose(X,-7) +transpose((X+X) ,12) ) ,-5) +transpose((step(X,12) +(((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) ) ,4) |((transpose(((shuffle(arpeggio(X) ) +transpose((X+transpose(transpose((X+X) ,-5) ,12) ) ,12) ) +transpose(echo(X,4,6) ,-7) ) ,-7) |((((transpose(X,-7) |transpose(X,-5) ) +transpose(((transpose(X,-7) +X) +echo((X+transpose(X,7) ) ,4,6) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ) +transpose((shuffle(((X+(X+transpose(X,12) ) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ) |(((transpose(X,4) +transpose(transpose(X,-7) ,4) ) +transpose((transpose(X,-7) +transpose(shuffle(X) ,7) ) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) ) ,12) ) ) ,7) ) ) +transpose(((step(step(shuffle(X) ,12) ,12) +transpose(((transpose((X|X) ,-7) +transpose((X+step(X,12) ) ,7) ) +transpose((transpose(X,-7) +transpose(shuffle(X) ,12) ) ,12) ) ,7) ) +transpose(transpose(transpose((((((arpeggio(X) +transpose(X,4) ) +transpose(step(X,12) ,7) ) +transpose((((X|X) +transpose(arpeggio(transpose(X,-7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(X,7) ) +transpose(step(X,12) ,12) ) ,-7) ,4) ,12) ) ,12) ) ,4) ) +transpose(arpeggio((((arpeggio((transpose((((X+transpose(X,7) ) +transpose((transpose(X,4) +transpose(X,12) ) ,12) ) +transpose(arpeggio(echo(X,4,6) ) ,12) ) ,-7) |(echo(X,4,6) +transpose((transpose(transpose(arpeggio(X) ,-7) ,4) |transpose(transpose(X,-5) ,-7) ) ,12) ) ) ) +transpose(((((arpeggio(transpose(X,-7) ) +transpose(step((transpose((X+transpose(X,7) ) ,4) |(X|X) ) ,12) ,4) ) +transpose((X+transpose(echo(X,4,6) ,12) ) ,7) ) +transpose((((X+transpose(transpose(step(X,12) ,-7) ,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio((transpose(X,-7) +transpose(X,7) ) ) ,7) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,7) ) +transpose((((arpeggio(step(echo(X,4,6) ,12) ) +transpose(((echo(X,4,6) +(X+X) ) |(shuffle(X) +transpose(transpose(X,-7) ,12) ) ) ,4) ) +transpose(transpose((transpose(echo(X,4,6) ,-7) +transpose((echo(X,4,6) +transpose(X,7) ) ,7) ) ,4) ,7) ) +transpose(transpose(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ,-7) ,12) ) ,7) ) +transpose(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,7) ) +transpose(arpeggio((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,7) ) +transpose(arpeggio((transpose(X,-5) |echo(X,4,6) ) ) ,7) ) ,-7) ,12) ) ) ,7) ) +transpose(transpose(transpose(((shuffle((((echo(arpeggio(arpeggio(X) ) ,4,6) +transpose((((((X+X) +transpose(transpose(X,-7) ,12) ) +transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |X) ,12) ) +transpose(transpose(step(transpose(X,-7) ,12) ,-7) ,7) ) |((((((shuffle(X) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) +transpose(X,12) ) +transpose(((X+transpose(X,7) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ,-7) ,12) ) ,4) ) +transpose(((X+transpose(X,12) ) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) ,-5) ) ,7) ) +transpose(((step(X,12) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,7) ) +(transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) ) ) +transpose((step((((step((X|X) ,12) +echo(X,4,6) ) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio((arpeggio(step(X,12) ) +transpose(((step(X,12) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,7) ) ) ,7) ) ,12) +transpose(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,12) ) +transpose(((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,4,6) ,12) ) ,-5) ) +transpose((((((transpose(((transpose(X,-7) +transpose(transpose(X,4) ,7) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,-7) +transpose(step(transpose(step(X,12) ,4) ,12) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) +arpeggio(transpose(step(echo((((step(X,12) |echo(X,4,6) ) +transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ,12) ,4) ) ) +transpose(((transpose(X,4) +transpose((((X|X) +transpose(step(X,12) ,12) ) +transpose((transpose(X,-7) |X) ,12) ) ,12) ) |(X+transpose(X,7) ) ) ,4) ) +transpose(transpose(step(transpose(X,-7) ,12) ,-7) ,7) ) ,12) ) ,-5) ,-7) ,12) ) random seed used was 0 EXPR = transpose(((echo(transpose(echo(transpose(((echo(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4,6) +transpose(step(step(X,12) ,12) ,4) ) +transpose((X+transpose(shuffle(X) ,12) ) ,7) ) ,-7) ,4,6) ,-5) ,4,6) +(arpeggio((echo(transpose((step(step((transpose(X,-5) +(X+transpose((X+transpose(X,12) ) ,7) ) ) ,12) ,12) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,-7) ,4,6) |((transpose(echo(transpose(transpose(arpeggio(X) ,-7) ,-7) ,4,6) ,4) +transpose((((X+transpose(echo((transpose((X+transpose(X,12) ) ,-7) +transpose(X,7) ) ,4,6) ,12) ) +transpose((echo(((X+transpose(X,12) ) +transpose(X,7) ) ,4,6) +transpose((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ,7) ) ,7) ) +transpose(arpeggio(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(X,12) ) ,-5) ) ,12) ) ,7) ) +transpose(((transpose(transpose(X,-7) ,-7) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) +(((((X+transpose(transpose(X,-7) ,12) ) +(X+transpose(X,7) ) ) +transpose(echo(((transpose(X,-7) +transpose((transpose(X,-7) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,7) ) ,4,6) ,7) ) +transpose((transpose(transpose(X,-7) ,-7) |transpose((arpeggio(X) +transpose(X,12) ) ,-7) ) ,7) ) +transpose(arpeggio(transpose(transpose((((arpeggio(X) +transpose(transpose(X,4) ,12) ) +transpose((X+transpose((X|X) ,7) ) ,4) ) +transpose(X,7) ) ,4) ,-7) ) ,12) ) ) ,7) ) ) ) +(shuffle(transpose((step(((X+transpose(transpose(arpeggio(X) ,-7) ,12) ) +transpose((X+X) ,7) ) ,12) |shuffle(arpeggio(transpose(step(X,12) ,-7) ) ) ) ,-7) ) +transpose(((transpose(step(step(X,12) ,12) ,-7) +transpose(step(transpose(echo(echo(step((X|X) ,12) ,4,6) ,4,6) ,-7) ,12) ,4) ) +transpose(((transpose(((transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(echo(transpose(((X+transpose(X,7) ) |X) ,-7) ,4,6) ,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,-7) |step(X,12) ) |echo(transpose((shuffle((X|X) ) +transpose((transpose((X|X) ,-7) +transpose(X,12) ) ,12) ) ,-7) ,4,6) ) ,7) ) ,7) ) ) ) +arpeggio(((echo(transpose(((((step(step(X,12) ,12) +transpose(X,4) ) +transpose((X|step(transpose(X,-7) ,12) ) ,7) ) +transpose(arpeggio(X) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ,4,6) +transpose((step((step(transpose((X+echo(X,4,6) ) ,-5) ,12) +transpose(arpeggio((transpose(((echo(X,4,6) +transpose(X,7) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,-5) +transpose(shuffle(((X|X) +transpose(echo(X,4,6) ,7) ) ) ,7) ) ) ,12) ) ,12) +transpose(((echo(((X+transpose(X,12) ) +step(X,12) ) ,4,6) +transpose(arpeggio(shuffle((shuffle(X) +(X|X) ) ) ) ,7) ) |(transpose(transpose(transpose(X,-7) ,-7) ,-7) |transpose(((X|X) +transpose(X,12) ) ,-5) ) ) ,12) ) ,4) ) +transpose(((arpeggio(transpose(((echo(X,4,6) +transpose(((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(X,-7) ,7) ) ,12) ) |shuffle(shuffle(((X|X) +transpose(X,4) ) ) ) ) ,4) ) +transpose(arpeggio(transpose(step((((echo(X,4,6) +transpose((X+X) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,12) ,-7) ) ,4) ) +transpose(((transpose((X+X) ,-7) +transpose(shuffle(X) ,12) ) +transpose(step((transpose(X,-7) |X) ,12) ,12) ) ,7) ) ,7) ) ) ) ,-5) random seed used was 0

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