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

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