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: shuffle((((step(step((step(transpose((arpeggio(X) +(shuffle(X) +X) ) ,-7) ,12) +transpose(step(shuffle(((X+transpose(X,7) ) +transpose(transpose(((step(X,12) +transpose(X,4) ) +transpose((X|X) ,7) ) ,-7) ,12) ) ) ,12) ,-7) ) ,12) ,12) +(step(((step(step(echo(X,4,6) ,12) ,12) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose(echo(echo(echo(X,4,6) ,4,6) ,4,6) ,7) ) ,12) +transpose(transpose((((((transpose((transpose(X,-5) +transpose((X|X) ,7) ) ,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose((((X+transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,7) ) +transpose(arpeggio(shuffle((X+transpose((X|X) ,7) ) ) ) ,4) ) +transpose(transpose(echo(transpose(transpose(X,-5) ,-7) ,4,6) ,4) ,7) ) +transpose(echo(transpose(transpose(X,-5) ,-7) ,4,6) ,7) ) ,-7) ,12) ) ) +transpose(((echo(transpose(((step((((((transpose(X,-7) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +X) +transpose((arpeggio(transpose(X,-7) ) +shuffle(arpeggio(X) ) ) ,12) ) +transpose(arpeggio(echo((X+transpose(X,12) ) ,4,6) ) ,12) ) ,12) +shuffle((transpose(X,-7) +transpose(((X+transpose(transpose((X+X) ,-7) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ,7) ) ) ) +transpose(transpose((arpeggio(transpose(echo(X,4,6) ,-7) ) +transpose(arpeggio(transpose(echo(transpose((X+transpose(X,12) ) ,4) ,4,6) ,4) ) ,7) ) ,-5) ,12) ) ,-5) ,4,6) +transpose(step(transpose(transpose(((((((((X+transpose(arpeggio(X) ,7) ) +transpose(transpose(X,-5) ,12) ) +transpose(echo(shuffle((X+transpose(X,7) ) ) ,4,6) ,12) ) +transpose(arpeggio(transpose((transpose(X,-7) +transpose(arpeggio(X) ,7) ) ,4) ) ,12) ) +transpose(step(X,12) ,-5) ) +transpose(shuffle(transpose(X,-7) ) ,12) ) +transpose(((arpeggio(transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ) +transpose(shuffle(step(X,12) ) ,7) ) +transpose((echo(X,4,6) +transpose((X|transpose(X,4) ) ,7) ) ,7) ) ,4) ) +transpose(step((X|echo(X,4,6) ) ,12) ,7) ) ,4) ,-7) ,12) ,7) ) +transpose(echo(transpose((transpose((step(X,12) +(echo(transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ,-7) ,4,6) +transpose(((X+X) +arpeggio(X) ) ,7) ) ) ,-5) |(arpeggio(echo(arpeggio((X+transpose(X,7) ) ) ,4,6) ) +transpose((transpose(arpeggio(echo((arpeggio(X) +transpose(transpose(shuffle(X) ,-7) ,12) ) ,4,6) ) ,4) +transpose(transpose((transpose(echo(X,4,6) ,4) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,4) ,12) ) ,7) ) ) ,4) ,4,6) ,12) ) ,4) ) +transpose(echo((transpose(arpeggio(shuffle(arpeggio(transpose((((step(X,12) +transpose(step(transpose(X,-7) ,12) ,12) ) +transpose((echo(X,4,6) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,12) ) +transpose(((transpose((X+transpose(X,12) ) ,-5) +transpose(((X+X) +transpose(shuffle(X) ,12) ) ,12) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,7) ) ,-7) ) ) ) ,-7) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(arpeggio(shuffle(X) ) ,4,6) ,12) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) +transpose(((transpose(echo(X,4,6) ,-5) +transpose(X,12) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) ,12) ) +transpose(echo(step(step(((((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(step(X,12) ,7) ) +transpose(arpeggio(arpeggio(X) ) ,4) ) +transpose(echo(((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ,12) ) ,4,6) ,7) ) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ,12) ,12) ,4,6) ,12) ) ,7) ) ,4,6) ,7) ) ) random seed used was 1367631 EXPR = transpose((transpose(((transpose(transpose(arpeggio((X+transpose(echo(X,4,6) ,12) ) ) ,-7) ,4) +transpose(shuffle((transpose((((arpeggio(step(shuffle(X) ,12) ) +transpose(((X|X) +transpose(step(transpose(X,4) ,12) ,12) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) +(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ,-5) +transpose(transpose(transpose(arpeggio((step(X,12) +transpose((X+transpose(X,7) ) ,12) ) ) ,-7) ,-7) ,12) ) ) ,4) ) +transpose(((((((transpose(shuffle(X) ,4) +transpose(transpose(step(X,12) ,-7) ,12) ) +(shuffle(transpose((X|X) ,-7) ) +((echo(echo(X,4,6) ,4,6) +transpose((X+transpose(transpose(X,-7) ,12) ) ,4) ) +transpose((((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) ,7) ) ) ) +transpose((step(echo(step(((transpose(X,-7) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ,4,6) ,12) +(transpose(arpeggio(transpose(X,4) ) ,-7) +transpose(((transpose(transpose(X,-7) ,-7) +transpose(arpeggio(echo(X,4,6) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) ) ,4) ) +transpose((transpose(arpeggio(transpose(X,-7) ) ,-7) +transpose((transpose(transpose(echo(X,4,6) ,-5) ,-7) +transpose(((X|(X|X) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ,12) ) ,7) ) ,7) ) +transpose((((transpose(echo(((((transpose(arpeggio(X) ,-5) +transpose(arpeggio(X) ,4) ) +transpose(((X+X) +transpose(transpose(X,-5) ,12) ) ,7) ) +transpose(echo(((X+transpose(X,7) ) +transpose(X,-7) ) ,4,6) ,4) ) +transpose(X,7) ) ,4,6) ,-7) |((((shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +transpose(((echo(X,4,6) +transpose(((X+transpose(X,7) ) +transpose((X|X) ,12) ) ,4) ) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |step(shuffle(X) ,12) ) ,7) ) ,4) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,12) ) ) ,4) ,7) ) +transpose(transpose(step(echo(X,4,6) ,12) ,-7) ,12) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ) +transpose(((arpeggio(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(((arpeggio(X) +transpose(X,12) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,7) ) +transpose(transpose(step(X,12) ,-7) ,12) ) ) |shuffle(transpose(X,-5) ) ) +arpeggio(X) ) ,7) ) +((((shuffle(shuffle(X) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) |((transpose(X,4) +transpose(X,12) ) |echo(transpose(X,-7) ,4,6) ) ) |step(shuffle(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) +transpose(arpeggio(X) ,7) ) ) ,12) ) +transpose(((step(arpeggio(transpose((X+transpose(X,7) ) ,-5) ) ,12) +transpose((echo(shuffle((X+transpose(X,12) ) ) ,4,6) |shuffle((step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) ) ) ,12) ) +arpeggio(shuffle(((X+transpose(X,12) ) +transpose(X,12) ) ) ) ) ,12) ) ) ,4) ) +transpose(transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ,-5) ,7) ) ,7) ) ,-5) +transpose((echo(step(echo((transpose(echo(transpose(X,4) ,4,6) ,-7) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ,4,6) ,12) ,4,6) |(transpose(echo(arpeggio((arpeggio(transpose((transpose(X,4) +transpose((X+X) ,12) ) ,-5) ) |echo(step(X,12) ,4,6) ) ) ,4,6) ,-7) +transpose(transpose((transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,-7) +transpose(step((X+transpose((X|X) ,12) ) ,12) ,12) ) ,-7) ,12) ) ) ,7) ) ,-7) random seed used was 0 EXPR = transpose(step(step((step((transpose(shuffle(X) ,4) +transpose((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,12) |(((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) +transpose(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) |(step(X,12) +X) ) +(transpose(transpose(arpeggio(X) ,-7) ,-7) +transpose(step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,12) ) ) ,4) ) +transpose((((echo(X,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((transpose(X,-7) +transpose(X,-5) ) ,7) ) ,7) ) ) ,12) ,12) ,-7) random seed used was 0 EXPR = echo(echo(echo(((echo(((((((shuffle((X+transpose(X,12) ) ) |arpeggio(shuffle(X) ) ) +transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,4) ) +transpose(((X+transpose((X|X) ,7) ) |shuffle(X) ) ,7) ) +transpose(step(((transpose((X+transpose(X,7) ) ,4) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ,-5) ) +transpose(step(shuffle(transpose(echo((X+X) ,4,6) ,-7) ) ,12) ,4) ) +transpose(((step(step(transpose(X,-5) ,12) ,12) +transpose((arpeggio(X) +((X+transpose(X,7) ) +transpose((X|X) ,7) ) ) ,7) ) +transpose(echo((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(X,7) ) |((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ,4,6) ,7) ) ,7) ) ,4,6) +transpose(((transpose(arpeggio((step(transpose(((echo(X,4,6) +transpose((((X|X) +transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,-7) ,12) +transpose(step((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) ,12) ,12) ) ) ,4) +transpose(transpose(transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,-5) ,-7) ,4) ) +transpose(((step(transpose(shuffle(step(X,12) ) ,-7) ,12) +transpose((((transpose(transpose(X,-5) ,-7) +transpose(X,-7) ) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,7) ) +(X+X) ) ,7) ) ,12) ) +transpose(step((transpose(X,4) +transpose(X,12) ) ,12) ,12) ) ,7) ) ,12) ) +transpose((((((transpose((step(((X+transpose(X,7) ) +shuffle(X) ) ,12) |(step(arpeggio(X) ,12) +transpose(transpose(shuffle(X) ,4) ,7) ) ) ,-7) +transpose((transpose(((X+transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,-7) |(step(X,12) +transpose(X,12) ) ) ,4) ) +transpose((transpose((X+X) ,-5) +X) ,7) ) +transpose((echo((step(shuffle(transpose(transpose(X,-7) ,4) ) ,12) |transpose((arpeggio(X) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,-5) ) ,4,6) +(transpose(step(((echo(X,4,6) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ,-7) |echo((arpeggio(arpeggio(arpeggio(X) ) ) |transpose(((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ,-7) ) ,4,6) ) ) ,4) ) +transpose(((((((transpose(X,4) +arpeggio(((X+X) +step(X,12) ) ) ) +transpose(X,12) ) +transpose(((echo(transpose(arpeggio(X) ,-7) ,4,6) +transpose(((((X+X) |step(X,12) ) +transpose(step(X,12) ,4) ) +transpose(echo((X+shuffle(X) ) ,4,6) ,7) ) ,4) ) +transpose(step(step(transpose(X,-7) ,12) ,12) ,7) ) ,4) ) +transpose(step((arpeggio(X) +transpose(transpose((X+X) ,-5) ,7) ) ,12) ,7) ) +transpose((step(transpose(((step(X,12) +transpose(((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose((X|X) ,7) ) ,-5) ,12) +transpose(arpeggio((((X+transpose(X,12) ) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose((echo(echo(X,4,6) ,4,6) +transpose(transpose(step(X,12) ,-7) ,7) ) ,7) ) ) ,12) ) ,7) ) +transpose((echo(echo(X,4,6) ,4,6) +transpose(X,7) ) ,4) ) ,7) ) |((transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ,-7) +transpose(transpose(shuffle(transpose(transpose(X,-7) ,-7) ) ,-5) ,12) ) +transpose(transpose(transpose(arpeggio(((step(X,12) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose((X+echo(X,4,6) ) ,-7) ,7) ) ) ,-7) ,-5) ,12) ) ) ,7) ) ,4,6) ,4,6) ,4,6) random seed used was 0 NOTE: Generated phrase was too large ( 86000 ) , it has been truncated at 5000 notes.

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