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 18 generations the expression "X" became this: transpose((shuffle(step(arpeggio((echo((transpose(step(arpeggio(transpose(echo(X,4,6) ,4) ) ,12) ,-5) +transpose(((arpeggio(arpeggio(arpeggio(echo(X,4,6) ) ) ) +transpose(((transpose(shuffle(transpose(arpeggio(X) ,-5) ) ,-7) +transpose(shuffle(step(step((X|X) ,12) ,12) ) ,4) ) +transpose(arpeggio((arpeggio(X) +transpose((X+X) ,12) ) ) ,7) ) ,4) ) +transpose(transpose(((step(X,12) |((X|X) +transpose((X|X) ,-5) ) ) |(((X+X) |(X+X) ) |arpeggio((X+transpose(X,12) ) ) ) ) ,-5) ,7) ) ,7) ) ,4,6) +transpose((((transpose(shuffle(shuffle(X) ) ,-5) +transpose(echo(((transpose(X,-5) +transpose(shuffle(X) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) ,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((step(transpose(((X+transpose(X,-5) ) +transpose(transpose(X,-7) ,12) ) ,4) ,12) +transpose(transpose((arpeggio(X) |(X+transpose(X,12) ) ) ,4) ,4) ) +transpose(((X+transpose(X,12) ) +X) ,7) ) ,7) ) ,7) ) ) ,12) ) +transpose((((step((transpose(shuffle((X|X) ) ,-7) +transpose(transpose(X,-5) ,7) ) ,12) +transpose(transpose(shuffle((((X+transpose(arpeggio(X) ,7) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) +shuffle(echo(((X+X) +shuffle(X) ) ,4,6) ) ) ) ,4) ,12) ) +transpose(transpose((shuffle(transpose((X+transpose((X+X) ,12) ) ,4) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) ,4) ,7) ) +transpose(transpose(transpose(arpeggio((shuffle((X+transpose(X,7) ) ) |step(arpeggio(arpeggio(X) ) ,12) ) ) ,4) ,4) ,12) ) ,7) ) ,-7) random seed used was 261146246 EXPR = (shuffle((arpeggio((arpeggio(arpeggio(step(((transpose(X,-7) +transpose(X,12) ) +transpose(X,12) ) ,12) ) ) +((arpeggio((((transpose(X,4) |shuffle(X) ) +(X|X) ) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) +shuffle(X) ) ,7) ) ) |(((X+transpose((X+X) ,7) ) |arpeggio(transpose(X,-5) ) ) |(transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) ) ) +transpose(((echo((transpose(X,-5) +arpeggio(X) ) ,4,6) +transpose(echo((transpose(X,4) |arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,4) ) +transpose(transpose(((echo(arpeggio(X) ,4,6) |(X+arpeggio(X) ) ) |shuffle(arpeggio(X) ) ) ,4) ,7) ) ,7) ) ) ) +shuffle(step(transpose(step(transpose(((X|X) +(X+transpose(X,12) ) ) ,4) ,12) ,4) ,12) ) ) ) |(shuffle((((shuffle(shuffle((arpeggio((transpose(arpeggio(X) ,-5) +transpose((((X+shuffle(X) ) +transpose(X,4) ) +transpose(arpeggio(arpeggio(transpose(X,4) ) ) ,7) ) ,7) ) ) +transpose((((((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) |(step(X,12) |(transpose(X,-5) +transpose(X,12) ) ) ) +transpose((echo(X,4,6) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) ,7) ) +(shuffle(transpose(X,-7) ) +transpose(arpeggio(arpeggio(((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ) ) ,12) ) ) ,12) ) ) ) +(transpose(((arpeggio(transpose(X,-5) ) |(shuffle(echo(arpeggio(X) ,4,6) ) |(((X|X) |shuffle(X) ) |X) ) ) |((echo((step(arpeggio(shuffle(X) ) ,12) +transpose(transpose(transpose((X|X) ,4) ,4) ,12) ) ,4,6) +transpose(transpose(((step(X,12) +X) +transpose((X+X) ,4) ) ,-7) ,4) ) +transpose(((transpose(arpeggio(X) ,-5) +transpose(echo(arpeggio(X) ,4,6) ,7) ) |transpose(echo((X+X) ,4,6) ,-7) ) ,7) ) ) ,-5) |echo(arpeggio(shuffle(step(transpose(transpose((transpose(X,4) |arpeggio(X) ) ,-7) ,-7) ,12) ) ) ,4,6) ) ) +transpose((arpeggio(step(transpose(arpeggio(X) ,-5) ,12) ) +(shuffle((X+(transpose(X,-5) +transpose(X,12) ) ) ) +transpose(arpeggio(((shuffle(shuffle((X|(X+X) ) ) ) +transpose((((transpose(X,-5) +transpose(arpeggio(X) ,12) ) +(X+transpose(X,12) ) ) +transpose(arpeggio(X) ,-7) ) ,4) ) +transpose(transpose(arpeggio(transpose((X+transpose(X,7) ) ,-7) ) ,-5) ,7) ) ) ,12) ) ) ,12) ) |shuffle(((shuffle(transpose(shuffle(transpose(echo(X,4,6) ,4) ) ,4) ) +transpose((transpose(arpeggio(((X+transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,-7) +transpose(transpose(arpeggio(step(X,12) ) ,-7) ,4) ) ,4) ) +transpose(arpeggio(((transpose(transpose(((transpose(arpeggio(X) ,-7) +transpose(((X+transpose(X,7) ) |transpose(X,4) ) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,-5) ,-7) +transpose((transpose(X,-5) +transpose(transpose(transpose(arpeggio((transpose(X,4) +transpose((X+transpose(X,12) ) ,12) ) ) ,4) ,4) ,7) ) ,12) ) |(arpeggio((((arpeggio(((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) ) +step(arpeggio(X) ,12) ) |transpose(arpeggio(arpeggio(transpose(X,-5) ) ) ,-5) ) |transpose(((transpose((X+transpose(X,12) ) ,4) +step(X,12) ) +transpose(step(X,12) ,-5) ) ,-5) ) ) |transpose(((transpose(transpose((X+X) ,4) ,-5) +transpose(arpeggio(((arpeggio(arpeggio(((X+transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ) ) +transpose(((transpose(X,4) |echo(X,4,6) ) +((X+transpose(X,7) ) +transpose((X+transpose(X,4) ) ,7) ) ) ,4) ) +transpose(arpeggio(shuffle(step(X,12) ) ) ,7) ) ) ,4) ) +transpose((arpeggio(((X+transpose(shuffle(X) ,12) ) +transpose(step(transpose(X,-5) ,12) ,-5) ) ) |(shuffle(X) +transpose((arpeggio(X) +transpose((X+X) ,12) ) ,12) ) ) ,7) ) ,-7) ) ) ) ,7) ) ) ) ) +arpeggio((shuffle(transpose(transpose(transpose((echo(X,4,6) +transpose((shuffle(transpose((arpeggio(X) |transpose(X,-5) ) ,4) ) +((transpose((transpose(X,4) +transpose(X,12) ) ,-7) +transpose(transpose(shuffle(X) ,-7) ,4) ) |echo(transpose(echo(X,4,6) ,4) ,4,6) ) ) ,12) ) ,-7) ,-5) ,4) ) +transpose(transpose(((step((((shuffle(transpose(arpeggio(X) ,-5) ) +transpose(X,7) ) +transpose(shuffle(transpose(transpose((echo(X,4,6) +shuffle(X) ) ,4) ,-7) ) ,12) ) +transpose(arpeggio(shuffle(transpose(transpose(transpose(transpose(X,-5) ,4) ,-7) ,-7) ) ) ,7) ) ,12) +(((transpose(transpose((shuffle(((X|X) +transpose(echo(X,4,6) ,7) ) ) +shuffle(transpose((shuffle(X) +transpose((X+X) ,7) ) ,-5) ) ) ,4) ,4) +transpose(((echo(transpose(transpose(X,-7) ,-7) ,4,6) +shuffle(transpose(echo(X,4,6) ,-5) ) ) +transpose(transpose(transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo((X+X) ,4,6) ,7) ) +(X|X) ) +transpose((transpose((X|X) ,-5) +transpose(((X+transpose(shuffle((X+X) ) ,4) ) +transpose(X,7) ) ,7) ) ,12) ) +transpose(transpose((transpose((X|X) ,4) +((X+X) +transpose(X,7) ) ) ,4) ,7) ) ,4) ,4) ,12) ) ,4) ) +transpose(echo((arpeggio(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +step(((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ,12) ) ,4,6) ,7) ) +transpose(echo(((shuffle(X) +transpose((X+transpose(X,12) ) ,12) ) |arpeggio((X+transpose(X,7) ) ) ) ,4,6) ,12) ) ) +transpose(shuffle(arpeggio(((((shuffle(transpose((transpose(arpeggio(arpeggio(X) ) ,4) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ,4) ) +transpose(((step((X|X) ,12) +transpose((transpose(X,4) +transpose(X,-7) ) ,7) ) +(transpose(step(X,12) ,4) |(((X+transpose(X,7) ) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) +transpose(X,-7) ) ) ) ,4) ) +transpose(echo((transpose(X,-7) |(shuffle((X+transpose(X,7) ) ) +step((X+transpose(X,7) ) ,12) ) ) ,4,6) ,7) ) +transpose((transpose(echo(X,4,6) ,-5) |((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +step(X,12) ) ,-5) +transpose(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(shuffle(X) ,4) ,12) ) ,4) ) +transpose((transpose(X,-7) |transpose(shuffle(X) ,4) ) ,7) ) ) ,4) ) +transpose((transpose(transpose(transpose(step((X+X) ,12) ,-7) ,-7) ,4) +shuffle(((arpeggio(X) +transpose(transpose(transpose(((X+transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) ,-7) ,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ) ) ,7) ) ) ) ,7) ) ,-7) ,7) ) ) ) ) random seed used was 0

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