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((X|X) ) |shuffle(shuffle(X) ) ) |(transpose(shuffle(X) ,-5) +transpose(arpeggio((X|X) ) ,12) ) ) |transpose(shuffle((((shuffle(X) |transpose(X,-5) ) +((transpose(X,4) |transpose(X,4) ) +transpose((step(X,12) |X) ,7) ) ) +shuffle(X) ) ) ,-5) ) +(shuffle(((((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +((X+transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +(((X+transpose(X,4) ) +transpose(X,7) ) |((X+transpose(X,7) ) +arpeggio(X) ) ) ) +transpose(step(X,12) ,4) ) ) +transpose(shuffle((shuffle(echo(X,4,6) ) +X) ) ,12) ) ) |((echo(shuffle((X|X) ) ,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) ) |arpeggio((((shuffle(arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) |(transpose(X,4) +transpose(X,12) ) ) ) ) +transpose(echo(transpose((transpose(transpose(X,-5) ,-7) +transpose(((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ,7) ) ,-7) ,4,6) ,4) ) +transpose(transpose(shuffle(transpose(transpose(X,-7) ,4) ) ,-5) ,7) ) |transpose(transpose(arpeggio(shuffle(X) ) ,-5) ,-7) ) ) ) random seed used was 926 EXPR = transpose((transpose((shuffle((transpose((X+transpose(transpose(X,-7) ,7) ) ,-7) +transpose(arpeggio((X+X) ) ,-5) ) ) +transpose((((((transpose(shuffle(((X+transpose(X,12) ) +shuffle(X) ) ) ,-5) |transpose(shuffle(transpose(X,4) ) ,-5) ) +transpose((((transpose(((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) +transpose(((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) +transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) ,12) ) |transpose(X,4) ) +transpose(transpose((echo(transpose((shuffle(X) |(X+X) ) ,-7) ,4,6) +transpose(arpeggio(X) ,12) ) ,4) ,12) ) ,4) ) +transpose(transpose(transpose(transpose(shuffle(X) ,4) ,-5) ,-7) ,7) ) +shuffle(step((shuffle(transpose(((X+X) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose(step(shuffle(transpose(X,-7) ) ,12) ,-5) ) ,12) ) ) +shuffle(shuffle(shuffle(transpose(shuffle((transpose(X,-5) +((X+transpose(X,4) ) +transpose((X|X) ,7) ) ) ) ,-7) ) ) ) ) ,12) ) ,4) +transpose((transpose(((transpose((transpose(((transpose(X,4) |X) +transpose(((X+transpose(X,7) ) +X) ,12) ) ,-7) |arpeggio(shuffle(step(shuffle(step(X,12) ) ,12) ) ) ) ,4) +transpose(transpose((echo(shuffle((X+transpose(X,12) ) ) ,4,6) +shuffle(shuffle(transpose(X,-7) ) ) ) ,-5) ,4) ) +transpose(echo(transpose((transpose(X,4) |transpose((((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(arpeggio(X) ,7) ) ,-5) ) ,-5) ,4,6) ,7) ) ,-5) +transpose(transpose(transpose(shuffle((((shuffle(step(X,12) ) +transpose(((X+transpose(X,12) ) |transpose(X,-5) ) ,12) ) +transpose(transpose(transpose(transpose(X,-7) ,-7) ,-7) ,4) ) +transpose((((X+(X+transpose(X,12) ) ) +(X|X) ) +(step(X,12) |shuffle(X) ) ) ,7) ) ) ,-5) ,4) ,12) ) ,12) ) ,-5) random seed used was 0 EXPR = ((echo(transpose(shuffle(shuffle(echo(shuffle(transpose(transpose(echo(step(((X+transpose(X,12) ) +(X|X) ) ,12) ,4,6) ,-5) ,4) ) ,4,6) ) ) ,-5) ,4,6) +(((echo((((shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +transpose(((((transpose((X|X) ,-7) +transpose(X,4) ) +transpose(X,7) ) +((X+X) |((transpose(X,4) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ) ) +(shuffle(shuffle(X) ) |transpose(X,4) ) ) ,12) ) +transpose(transpose(((shuffle((((X+transpose(X,7) ) |X) +transpose((X+transpose(X,12) ) ,12) ) ) +transpose(transpose(((X+transpose(X,-7) ) +transpose(transpose(X,-5) ,7) ) ,-5) ,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,4) ,4) ) +transpose(shuffle((transpose(transpose((transpose(X,-7) +arpeggio(transpose(X,-7) ) ) ,4) ,4) +((shuffle(transpose(X,-5) ) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,4) ) +transpose(shuffle((arpeggio(X) +transpose(X,12) ) ) ,7) ) ) ) ,7) ) ,4,6) +transpose(((arpeggio(echo(echo(transpose((X+X) ,-7) ,4,6) ,4,6) ) +transpose((((X+transpose(arpeggio(arpeggio(X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((X+transpose(X,7) ) ,-5) ) ,12) ) |transpose(transpose(((X+transpose((transpose(X,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose((transpose(shuffle(X) ,-7) +(transpose(X,-5) +transpose(echo(X,4,6) ,7) ) ) ,7) ) ,-5) ,4) ) ,4) ) +transpose(((shuffle(step(((((X|((X+transpose(X,7) ) +transpose(X,12) ) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) +transpose(transpose(transpose(shuffle(arpeggio(X) ) ,4) ,4) ,4) ) +transpose(((transpose(arpeggio(X) ,-5) +transpose(shuffle(X) ,7) ) |(transpose(shuffle(X) ,-7) +transpose(shuffle(X) ,7) ) ) ,7) ) ,12) ) +shuffle(transpose((transpose(X,-7) +arpeggio(echo(((X+X) |shuffle(X) ) ,4,6) ) ) ,-7) ) ) |(transpose((X+transpose(X,12) ) ,-5) +transpose((X+transpose(X,12) ) ,12) ) ) ,7) ) |arpeggio(transpose(shuffle(transpose(transpose(arpeggio(echo(X,4,6) ) ,-5) ,-7) ) ,4) ) ) ) +transpose(((transpose(((echo(echo(transpose(arpeggio(step((X+transpose((X+X) ,7) ) ,12) ) ,-5) ,4,6) ,4,6) +(transpose(shuffle(((X+transpose(X,12) ) |((X+transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ) ,-5) |(transpose(((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4) +shuffle(transpose(X,-5) ) ) ) ) |transpose(step(shuffle(((X+transpose(X,7) ) +transpose(X,7) ) ) ,12) ,-7) ) ,4) +transpose(arpeggio(step(((((((transpose(X,-7) |(X|step(X,12) ) ) |transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose(((transpose(shuffle((X+X) ) ,4) +transpose((((shuffle(X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |(X+transpose(X,12) ) ) ,4) ) +transpose(transpose(step(step(X,12) ,12) ,-7) ,7) ) ,12) ) +transpose(arpeggio((transpose(X,4) |transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) ) ,7) ) |(((((echo(transpose(X,-7) ,4,6) +((transpose(X,-7) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(((X+(X+X) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ,-7) ,7) ) |((shuffle((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) |arpeggio(transpose(transpose(X,-5) ,-7) ) ) ,4) ) +transpose((transpose(transpose(X,-5) ,-5) +transpose(transpose(X,4) ,12) ) ,7) ) ) |((shuffle(transpose(shuffle((X|(X|X) ) ) ,4) ) +transpose((transpose(transpose(X,4) ,4) +transpose((arpeggio(X) |shuffle(X) ) ,12) ) ,4) ) +transpose((transpose(X,-7) +shuffle(X) ) ,7) ) ) ) +transpose(transpose((transpose(transpose(transpose((X|X) ,-5) ,4) ,-7) +transpose((((shuffle((((shuffle(X) +transpose(X,4) ) +transpose((X+X) ,-7) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(transpose(transpose(X,-7) ,4) ,12) ) +transpose((((X+transpose(shuffle(X) ,7) ) +transpose((((X+X) +X) +step((X+transpose(X,12) ) ,12) ) ,4) ) +transpose((step(X,12) +transpose(shuffle(X) ,12) ) ,7) ) ,4) ) +transpose(transpose(((echo((X|X) ,4,6) |transpose((X+X) ,-5) ) +(X+X) ) ,-7) ,7) ) ,12) ) ,4) ,12) ) ,12) ) ,4) ) +transpose(((arpeggio(transpose(arpeggio(transpose(transpose((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,4) ) ,4) ) +transpose(arpeggio((shuffle((transpose(arpeggio(shuffle(X) ) ,-5) |(((X+transpose(X,12) ) |(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) +echo(X,4,6) ) ) +transpose((arpeggio((transpose(X,-7) +transpose(X,12) ) ) +((X+transpose(X,12) ) +transpose(X,7) ) ) ,7) ) ) ) +shuffle((transpose(((transpose(X,-7) |(X|X) ) |shuffle(X) ) ,-5) +transpose(echo(transpose(arpeggio(X) ,-5) ,4,6) ,7) ) ) ) ) ,4) ) +transpose(step((((transpose((step(transpose(X,-5) ,12) |((((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) |(shuffle(X) +shuffle(X) ) ) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ) ) ,-5) +transpose((transpose(((X+transpose(X,7) ) +transpose(X,4) ) ,-7) +transpose(X,-5) ) ,7) ) +arpeggio((echo((transpose(X,-7) |X) ,4,6) +transpose(transpose((X|X) ,-5) ,7) ) ) ) +(transpose((shuffle(shuffle((transpose(X,4) +((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) ) ) +transpose(transpose(arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,-5) ,7) ) ,4) |shuffle(shuffle((((((shuffle(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(shuffle((X+X) ) ,4) ) +transpose(((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,7) ) +transpose(shuffle((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) ) ,7) ) ) ) ) ) ,12) ,7) ) ,7) ) ,12) ) random seed used was 0 EXPR = (transpose((transpose(shuffle((shuffle(shuffle(shuffle(transpose(X,-5) ) ) ) +transpose(transpose(shuffle(transpose(X,4) ) ,4) ,7) ) ) ,4) +((shuffle(transpose(transpose(transpose(X,-5) ,-5) ,-7) ) |((step((X+transpose(transpose(X,-5) ,12) ) ,12) |(X+transpose(X,-5) ) ) |(((transpose(X,-7) +transpose(X,-5) ) +transpose((shuffle((transpose(X,4) +transpose(X,12) ) ) +(X+X) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ) ) |((((transpose(X,4) +transpose(X,12) ) +transpose(transpose(step(transpose(X,-5) ,12) ,4) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) +(((step(X,12) +transpose(echo(step(X,12) ,4,6) ,12) ) +transpose(((shuffle((X|X) ) +transpose(shuffle(echo(X,4,6) ) ,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(((((X+X) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +shuffle(X) ) ,7) ) ) ) ) ,-5) |((transpose(((transpose(shuffle(X) ,-5) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ,4) +transpose(shuffle((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) ,-7) ) +step((step(transpose(X,4) ,12) +transpose(transpose(X,-7) ,7) ) ,12) ) ) random seed used was 0

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