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: (step(((echo(shuffle(shuffle(transpose(transpose(echo(((((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +transpose(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) ,-7) ,-7) ) ) ,4,6) +transpose(shuffle(arpeggio((transpose(((((((transpose(X,-7) +X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) ,7) ) +transpose((shuffle(arpeggio(X) ) +transpose(((X+transpose(X,7) ) |transpose(X,4) ) ,7) ) ,4) ) +transpose((transpose(X,4) |step((X+X) ,12) ) ,7) ) |(((X+transpose(X,7) ) +step(X,12) ) +transpose(X,-7) ) ) ,-5) +transpose((arpeggio(arpeggio(arpeggio(X) ) ) +shuffle(shuffle(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ) ) ,7) ) ) ) ,4) ) +transpose(echo((((shuffle(X) +transpose(arpeggio((shuffle(((echo((X+transpose(X,7) ) ,4,6) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(step((((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) |((X+transpose(X,7) ) +X) ) ,12) ,7) ) ) ,4) ) +transpose(echo(((X+transpose(arpeggio(X) ,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,7) ) +transpose(transpose((shuffle(((transpose(X,-7) +X) +(((X+transpose(X,4) ) +transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) +transpose(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,4) ,12) ) ,4,6) ,7) ) ,12) |transpose(arpeggio(arpeggio((((shuffle(transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose((transpose((arpeggio(X) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,4) +transpose(echo((X+echo(X,4,6) ) ,4,6) ,12) ) ,4) ) +transpose(((echo(echo(arpeggio((X+X) ) ,4,6) ,4,6) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose(transpose((((X+transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ,7) ) ,7) ) +transpose(((echo(((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ,4,6) +transpose(step(transpose(((shuffle(X) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,-7) ,12) ,4) ) +transpose((transpose(((echo(X,4,6) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose((((X+transpose(X,7) ) +transpose(arpeggio(X) ,7) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,12) ) ,7) ) ,7) ) ) ) ,4) ) random seed used was 1367631 EXPR = ((arpeggio(shuffle(arpeggio((arpeggio((((X|((X+transpose(X,12) ) +transpose(X,7) ) ) +transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) +transpose(shuffle(transpose(X,4) ) ,12) ) ) ) ) +transpose((transpose(arpeggio(step(arpeggio(((X+transpose(X,7) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ) ,12) ) ,-7) +echo(shuffle(shuffle((transpose(((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4) +transpose(shuffle(X) ,12) ) ) ) ,4,6) ) ,12) ) +transpose(step((((arpeggio(arpeggio(transpose(arpeggio(step(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,-5) ) ) +((((((((arpeggio(X) +transpose(step(X,12) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) +transpose(transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,4) ) +transpose((step((X|X) ,12) |transpose((X+X) ,-5) ) ,7) ) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose((step(transpose(X,-5) ,12) +(transpose(transpose(X,-5) ,4) |X) ) ,7) ) +transpose(((((arpeggio(X) +transpose(arpeggio(arpeggio(X) ) ,4) ) +transpose((X|X) ,7) ) +transpose(arpeggio((X+X) ) ,12) ) +((echo(((X+transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) ,4,6) +transpose((((arpeggio(X) +transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) +transpose(X,7) ) +transpose(step(((X+transpose(X,7) ) +transpose(step(X,12) ,7) ) ,12) ,7) ) ,4) ) +transpose((shuffle(echo(transpose(X,-5) ,4,6) ) +transpose((X+X) ,-5) ) ,7) ) ) ,4) ) +transpose(step(echo(shuffle(echo(transpose(X,-7) ,4,6) ) ,4,6) ,12) ,7) ) ) +transpose((((echo((step(transpose((X+transpose(X,7) ) ,-5) ,12) |(((shuffle(X) +transpose(((step(X,12) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +((transpose(((step(X,12) +(X|X) ) +transpose(step(X,12) ,7) ) ,-5) +transpose(((echo(transpose(X,-7) ,4,6) +transpose(transpose(((X+transpose(X,12) ) +transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,-7) ,12) ) |transpose(X,4) ) ,4) ) +transpose((step(shuffle(X) ,12) +transpose(transpose((X|X) ,-5) ,7) ) ,7) ) ) |arpeggio(((echo(transpose(X,-7) ,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(((X+transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) ,12) ,7) ) ) ) ,7) ) |(echo((step(arpeggio(((X|X) +transpose(echo(X,4,6) ,12) ) ) ,12) +transpose((shuffle(((((X|X) +arpeggio(X) ) +transpose(X,4) ) +transpose(X,7) ) ) +(transpose(echo(X,4,6) ,4) +transpose(X,7) ) ) ,7) ) ,4,6) +transpose(arpeggio(arpeggio(transpose((echo((X|X) ,4,6) +(transpose(shuffle((X+X) ) ,4) +transpose((X+X) ,-5) ) ) ,-5) ) ) ,7) ) ) ,12) ,7) ) random seed used was 0 EXPR = ((((((transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) +transpose(shuffle((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ) ) ,7) ) +transpose(((arpeggio(((step(transpose(X,-5) ,12) +transpose(((transpose(X,4) +transpose(transpose(X,-5) ,7) ) |shuffle(transpose(X,-5) ) ) ,4) ) +transpose(step(step(step(X,12) ,12) ,12) ,7) ) ) +transpose(arpeggio(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose(X,-7) ,4) ) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ) ,7) ) +transpose((arpeggio(echo(X,4,6) ) +transpose(((((arpeggio((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) +transpose(step((X+X) ,12) ,4) ) +transpose((transpose((X|X) ,4) +(echo(X,4,6) +transpose(X,7) ) ) ,7) ) +transpose(arpeggio((shuffle(X) +shuffle(X) ) ) ,4) ) +transpose(shuffle(arpeggio(((X+transpose(X,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,7) ) ) ) ,7) ) ,12) ) ,7) ) ,4) ) +transpose(transpose(shuffle(step((arpeggio(transpose(X,-5) ) |(X+transpose(X,7) ) ) ,12) ) ,-7) ,7) ) +transpose(transpose(((transpose(X,-5) +transpose(arpeggio(transpose(((shuffle(X) |(X+transpose(X,12) ) ) |transpose(X,-5) ) ,-7) ) ,4) ) +transpose(echo(((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) ,7) ) ,-5) ,7) ) +transpose((echo(transpose(shuffle((step(shuffle(shuffle(X) ) ,12) +transpose(step(shuffle(X) ,12) ,12) ) ) ,-5) ,4,6) |step((shuffle(step(((((shuffle((step((X+X) ,12) +transpose(step(transpose(X,-7) ,12) ,7) ) ) +transpose(echo(((step(echo(X,4,6) ,12) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose((X+X) ,7) ) ,4,6) ,4) ) +transpose((((X|X) +X) |step(step((X|X) ,12) ,12) ) ,7) ) +transpose((arpeggio(X) +transpose(transpose(echo(step(shuffle(X) ,12) ,4,6) ,-5) ,7) ) ,4) ) +transpose((shuffle(arpeggio(X) ) +shuffle(X) ) ,7) ) ,12) ) +transpose(shuffle(((step((transpose(X,4) +transpose(transpose(X,-5) ,12) ) ,12) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ) ,7) ) ,12) ) ,4) ) +transpose((((step(((((arpeggio((X+transpose(X,12) ) ) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose(((step(X,12) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,7) ) +transpose(echo(X,4,6) ,7) ) +step(arpeggio(transpose(X,-5) ) ,12) ) ,12) +transpose(arpeggio(echo(shuffle((step(X,12) +transpose(transpose(X,-5) ,12) ) ) ,4,6) ) ,7) ) |step(shuffle(((arpeggio(echo(transpose(step(X,12) ,-7) ,4,6) ) +((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((X+transpose(X,7) ) ,12) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) +transpose((transpose(step(transpose(X,4) ,12) ,4) +transpose(transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(((shuffle(step(X,12) ) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose((echo(X,4,6) +(X+transpose(X,12) ) ) ,7) ) ,7) ) ,-7) ,12) ) ,7) ) ) ,12) ) +transpose(((transpose((transpose(step(X,12) ,-7) +(transpose(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,-5) +transpose((X+transpose(transpose(step(X,12) ,4) ,7) ) ,7) ) ) ,-5) +transpose((arpeggio(transpose(X,4) ) +transpose(arpeggio(shuffle(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) ,12) ) ,12) ) +transpose(echo(((((((transpose(step(X,12) ,4) +transpose((X+transpose(X,7) ) ,7) ) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +transpose((transpose(shuffle(X) ,-5) +step(transpose(step(X,12) ,-5) ,12) ) ,12) ) +transpose((((shuffle(X) +step(step(X,12) ,12) ) +transpose((echo(step(X,12) ,4,6) +arpeggio(X) ) ,4) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,4) ,7) ) ,4) ) +transpose((((((echo(transpose(X,4) ,4,6) +transpose(X,12) ) +transpose(echo(((transpose(X,4) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose(((shuffle(X) +transpose(transpose(X,-7) ,12) ) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ,7) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(step(echo(arpeggio(X) ,4,6) ,12) ,7) ) ,7) ) ,4,6) ,7) ) ,12) ) ,7) ) random seed used was 0 EXPR = shuffle((((transpose(echo((arpeggio(((X+step(transpose(X,-5) ,12) ) |step(transpose(X,-7) ,12) ) ) +transpose(shuffle((step(((X+X) +transpose(echo(X,4,6) ,7) ) ,12) +transpose((shuffle(arpeggio(X) ) +echo(X,4,6) ) ,7) ) ) ,7) ) ,4,6) ,-5) +step((((step(transpose(X,4) ,12) +transpose((X+transpose(X,12) ) ,7) ) +transpose(echo((transpose(X,4) |(shuffle(X) |(X+transpose(X,12) ) ) ) ,4,6) ,4) ) +transpose(step((step(X,12) +X) ,12) ,7) ) ,12) ) +transpose(arpeggio(((arpeggio(transpose(echo(X,4,6) ,-5) ) +(((transpose(X,4) |transpose(X,-7) ) +transpose(shuffle(echo(X,4,6) ) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ) +step(transpose(shuffle(arpeggio((X|X) ) ) ,4) ,12) ) ) ,7) ) +transpose((((echo(arpeggio(((transpose(X,4) +(X+transpose(echo(X,4,6) ,12) ) ) +(((X|X) +X) +transpose(echo(X,4,6) ,12) ) ) ) ,4,6) |step((shuffle(transpose(X,-5) ) |step(X,12) ) ,12) ) +transpose(transpose((echo(X,4,6) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,-7) ,7) ) +transpose(echo(((((X+transpose(X,12) ) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,4) ,4) ) +transpose((transpose(X,-7) +transpose(arpeggio(X) ,7) ) ,7) ) +step(transpose(arpeggio(transpose((X+X) ,-7) ) ,-7) ,12) ) ,4,6) ,7) ) ,-7) ) ) random seed used was 0

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