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 20 generations the expression "X" became this: transpose(transpose(transpose(arpeggio(arpeggio(transpose(echo(arpeggio(arpeggio(((step((X+transpose(X,7) ) ,12) +transpose(step(echo(X,4,6) ,12) ,12) ) +transpose(shuffle(X) ,-7) ) ) ) ,4,6) ,4) ) ) ,-5) ,4) ,4) random seed used was 233625897 EXPR = transpose(shuffle(transpose((arpeggio(transpose(shuffle(arpeggio(arpeggio(step(transpose(arpeggio(transpose(transpose(X,-7) ,-7) ) ,4) ,12) ) ) ) ,-5) ) +transpose(shuffle(arpeggio(transpose(echo(shuffle(transpose((X|arpeggio(step(X,12) ) ) ,-5) ) ,4,6) ,-5) ) ) ,12) ) ,4) ) ,-5) random seed used was 0 EXPR = (arpeggio((step(transpose(arpeggio((echo(shuffle(((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4,6) |transpose((((shuffle(X) +transpose((transpose(X,4) +(X+X) ) ,4) ) +transpose(X,7) ) |X) ,-7) ) ) ,4) ,12) +transpose(((((((((X+transpose(((X+transpose(X,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) ,4) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) +transpose(transpose(arpeggio(transpose(step(transpose(X,4) ,12) ,-7) ) ,-7) ,4) ) +transpose(arpeggio((transpose(transpose((X+(X+X) ) ,-5) ,-5) |echo(step(X,12) ,4,6) ) ) ,7) ) |transpose((transpose(arpeggio(shuffle(X) ) ,-5) +(transpose(transpose(X,-7) ,4) |X) ) ,4) ) +transpose((((echo((arpeggio(transpose(shuffle(X) ,4) ) +transpose(arpeggio(((X+transpose(step(X,12) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) ,4,6) +transpose(((transpose((X|transpose(X,-5) ) ,4) +step(shuffle(X) ,12) ) +shuffle(shuffle(arpeggio(arpeggio(X) ) ) ) ) ,4) ) +transpose(shuffle(shuffle((X+transpose(X,7) ) ) ) ,7) ) +transpose(step(shuffle(arpeggio(transpose(X,4) ) ) ,12) ,12) ) ,4) ) +transpose(step(shuffle(shuffle(transpose(step(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) ,12) ,-5) ) ) ,12) ,7) ) +transpose(arpeggio(transpose(X,-5) ) ,4) ) ,12) ) ) |step((((shuffle(echo(step((X+X) ,12) ,4,6) ) +transpose(echo(echo((((((shuffle(X) +X) +transpose(step(X,12) ,7) ) |((step(X,12) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X+transpose(X,7) ) ,12) ) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) +step(transpose((X|X) ,4) ,12) ) ,4,6) ,4,6) ,4) ) +transpose(transpose(step(step(((((transpose(X,-7) +step(X,12) ) +arpeggio((X+transpose(X,7) ) ) ) +X) +shuffle(transpose(X,-5) ) ) ,12) ,12) ,4) ,7) ) |echo((((((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(shuffle(transpose(X,-5) ) ,12) ) +step(shuffle(X) ,12) ) +transpose(shuffle((step((shuffle(X) +transpose(X,7) ) ,12) |(step(arpeggio(arpeggio(X) ) ,12) +echo(shuffle(arpeggio(X) ) ,4,6) ) ) ) ,12) ) ,4,6) ) ,12) ) random seed used was 0 EXPR = ((transpose(transpose(transpose(shuffle(shuffle(step(shuffle((step((X|X) ,12) +transpose((step(X,12) |transpose((X+transpose(X,12) ) ,-7) ) ,12) ) ) ,12) ) ) ,4) ,-5) ,-5) |(((arpeggio(arpeggio(((transpose((((shuffle(X) +X) +transpose((X|X) ,7) ) +transpose(shuffle(((X+transpose(step(X,12) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ) ,7) ) ,-7) +transpose(transpose(((transpose(step((shuffle(X) +shuffle(X) ) ,12) ,-7) |arpeggio(arpeggio(X) ) ) +step(arpeggio(arpeggio(((X+X) |X) ) ) ,12) ) ,-7) ,7) ) |(step(transpose((transpose(arpeggio(((X|((shuffle(X) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) ) +(step(transpose(X,4) ,12) +step(transpose(transpose(X,4) ,-5) ,12) ) ) ) ,-7) |transpose(transpose(step(arpeggio(X) ,12) ,-7) ,4) ) ,4) ,12) +transpose(((shuffle((shuffle(X) |step((transpose(X,-7) +transpose(step(X,12) ,7) ) ,12) ) ) +transpose(transpose((arpeggio(((X|X) +transpose(X,12) ) ) |transpose(transpose(X,4) ,-5) ) ,-7) ,7) ) |transpose(((arpeggio((shuffle(X) +transpose(X,4) ) ) +transpose(arpeggio(step(arpeggio(X) ,12) ) ,7) ) |(transpose(transpose((X|X) ,-7) ,-5) |transpose((X|step(X,12) ) ,-7) ) ) ,-5) ) ,4) ) ) ) ) +transpose(step(((((((step(X,12) |step(shuffle(((shuffle(transpose(step(X,12) ,4) ) |(X+transpose(step(X,12) ,7) ) ) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,12) ) +transpose(transpose(shuffle(shuffle(transpose((X+(((X+X) +transpose(arpeggio(X) ,4) ) +transpose((X|X) ,7) ) ) ,4) ) ) ,4) ,4) ) +transpose(arpeggio(transpose(shuffle(((shuffle(X) |echo((X+X) ,4,6) ) |(step(X,12) +X) ) ) ,-7) ) ,7) ) +((step(X,12) +step(transpose(shuffle(transpose(step(X,12) ,-7) ) ,-7) ,12) ) +(arpeggio((shuffle(shuffle((X+X) ) ) +(step(X,12) +transpose(shuffle(X) ,12) ) ) ) |echo((echo(step(X,12) ,4,6) |(arpeggio(X) +transpose(X,4) ) ) ,4,6) ) ) ) +step(shuffle(arpeggio((X+transpose(X,12) ) ) ) ,12) ) +transpose(step(step(step((transpose(step(transpose((X+X) ,4) ,12) ,-7) +transpose((arpeggio(X) +transpose(step(step(X,12) ,12) ,7) ) ,-7) ) ,12) ,12) ,12) ,7) ) ,12) ,4) ) +transpose(transpose(step(arpeggio(transpose(transpose(transpose(((((transpose(shuffle(X) ,-7) +transpose(step(transpose(X,4) ,12) ,7) ) +transpose(transpose(X,-7) ,4) ) |transpose(((transpose(X,4) |X) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(transpose(transpose((transpose(transpose(X,-7) ,4) +transpose((shuffle((X+X) ) +transpose((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) ,-7) ) ,7) ) ,-5) ,4) ,-5) ) ,-5) ,4) ,-7) ) ,12) ,4) ,7) ) +transpose(transpose(arpeggio(((transpose(transpose(transpose((transpose(transpose(step(transpose(step(X,12) ,-7) ,12) ,4) ,-5) +transpose(shuffle(step(arpeggio((transpose(X,-7) |step(X,12) ) ) ,12) ) ,12) ) ,4) ,-5) ,-5) +transpose(shuffle(step(echo(transpose(transpose(transpose(step(transpose(X,-7) ,12) ,4) ,-5) ,-5) ,4,6) ,12) ) ,12) ) |(transpose((transpose(transpose(step((transpose(X,-7) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ,-7) ,-7) +transpose(((transpose(transpose(((X+X) |transpose(transpose(X,-5) ,-7) ) ,-7) ,-7) +transpose(transpose(step(((arpeggio(step(arpeggio(X) ,12) ) +transpose(shuffle(X) ,-7) ) |step(transpose(transpose(X,4) ,-7) ,12) ) ,12) ,-5) ,4) ) +transpose(((step(arpeggio(shuffle(shuffle(X) ) ) ,12) +transpose(((((X+transpose(X,12) ) +transpose((X+X) ,7) ) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ,12) ) ,4) ) +transpose(transpose(echo(arpeggio(X) ,4,6) ,-5) ,7) ) ,7) ) +transpose((arpeggio(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) |transpose(((shuffle(X) +X) +(arpeggio(X) |transpose(X,-7) ) ) ,-7) ) ,12) ) ,7) ) ,12) ) ,-5) +transpose(echo(echo((arpeggio(shuffle(X) ) +shuffle(shuffle(X) ) ) ,4,6) ,4,6) ,7) ) ) ) ,-5) ,7) ) ) +transpose(shuffle(shuffle((((arpeggio(arpeggio((step(step((transpose(step(X,12) ,-5) +transpose(((((X+X) +echo(X,4,6) ) +transpose((((X|X) +transpose(step(X,12) ,12) ) +transpose((shuffle(X) |shuffle(X) ) ,7) ) ,4) ) +transpose(((X+transpose((X+X) ,7) ) +step(X,12) ) ,7) ) ,7) ) ,12) ,12) +transpose(((transpose(X,-5) +transpose((step(X,12) |step(X,12) ) ,12) ) +transpose(shuffle(transpose(((X+X) |transpose(X,-5) ) ,4) ) ,4) ) ,7) ) ) ) +transpose(((transpose((transpose(shuffle(transpose(arpeggio(X) ,4) ) ,4) +transpose(step(echo((((transpose(X,-7) +transpose(X,7) ) +transpose(((shuffle(X) +transpose(X,12) ) |((X+X) +echo(X,4,6) ) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,4,6) ,12) ,12) ) ,-7) +(((step(shuffle(echo(shuffle(transpose(arpeggio(X) ,-5) ) ,4,6) ) ,12) +transpose(transpose(((shuffle((X+transpose(X,7) ) ) +transpose((shuffle(X) +(X+transpose(X,7) ) ) ,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,4) ,4) ) +transpose(transpose(step((X+X) ,12) ,-7) ,7) ) |transpose(transpose(((((arpeggio(X) |X) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(arpeggio(X) ,7) ) |echo((X|(X|X) ) ,4,6) ) ,-7) ,-5) ) ) +transpose((echo(transpose(transpose(step((X+(X+transpose(X,7) ) ) ,12) ,-5) ,-7) ,4,6) |(transpose((arpeggio(echo(transpose((transpose(X,4) |(transpose(step(X,12) ,-5) |transpose(X,-5) ) ) ,4) ,4,6) ) |step(shuffle(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) ,12) ) ,-7) +transpose((transpose((arpeggio(((X+X) |(X+transpose(X,12) ) ) ) +transpose(((transpose(arpeggio(X) ,4) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) ,12) ) ,-5) +step((shuffle(transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) |(((transpose(X,4) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose((X+shuffle(X) ) ,7) ) +transpose(shuffle((X|X) ) ,7) ) ) ,12) ) ,7) ) ) ,7) ) ,7) ) +arpeggio(echo(transpose(transpose(step(arpeggio(transpose((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,4) ) ,12) ,4) ,-7) ,4,6) ) ) |shuffle((((arpeggio(transpose(transpose((step(transpose((step(X,12) |step(X,12) ) ,4) ,12) +X) ,4) ,-5) ) +step(transpose(arpeggio(((arpeggio((arpeggio(X) +step(X,12) ) ) |(transpose((X+transpose(X,12) ) ,4) |step(arpeggio(X) ,12) ) ) |transpose(transpose(X,4) ,4) ) ) ,-5) ,12) ) +transpose((transpose((transpose(transpose(((transpose(arpeggio(X) ,-7) +transpose(X,4) ) +transpose((X+shuffle(X) ) ,7) ) ,-5) ,-5) +transpose(step((transpose(X,-7) +transpose(transpose(shuffle(X) ,-7) ,12) ) ,12) ,7) ) ,4) +transpose(((step((((shuffle(X) +transpose(shuffle(X) ,7) ) +(X+arpeggio(X) ) ) +transpose(X,12) ) ,12) |transpose(((X+transpose(X,12) ) +arpeggio(echo(X,4,6) ) ) ,-5) ) +(((X+X) |arpeggio(step(X,12) ) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ,-7) ) |step((transpose(echo(transpose(step(shuffle(echo(shuffle(X) ,4,6) ) ,12) ,-5) ,4,6) ,4) +transpose(((arpeggio(shuffle(shuffle(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) ) ) |transpose(echo((arpeggio(X) |X) ,4,6) ,-5) ) |transpose(shuffle(arpeggio(transpose(X,-7) ) ) ,-7) ) ,12) ) ,12) ) ) ) ) ) ,7) ) random seed used was 0

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