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

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