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(transpose(echo((shuffle(shuffle(X) ) +transpose((transpose((X+X) ,-7) |transpose(X,4) ) ,7) ) ,4,6) ,-5) ) ,4) |(shuffle((((((step(transpose(shuffle(transpose(echo(transpose(((X|X) +X) ,4) ,4,6) ,-5) ) ,-5) ,12) |((arpeggio((X+X) ) |(X|X) ) +shuffle((transpose(((transpose(X,-5) +transpose(arpeggio(echo(X,4,6) ) ,4) ) +transpose(((X|X) +transpose(step(X,12) ,12) ) ,7) ) ,4) |(((X+transpose(X,12) ) +X) +transpose(transpose(arpeggio(shuffle(X) ) ,-7) ,7) ) ) ) ) ) +transpose((arpeggio(transpose((arpeggio(((X+transpose(X,12) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) +((X|X) +(((X+transpose(X,12) ) |shuffle(transpose((X+X) ,-7) ) ) +transpose(((X+transpose(X,12) ) +shuffle(X) ) ,12) ) ) ) ,-5) ) +transpose((transpose(((transpose((transpose((X+X) ,4) +transpose(X,-7) ) ,4) +transpose(transpose(step(transpose(X,-7) ,12) ,-7) ,7) ) |((X+transpose(transpose(X,-7) ,12) ) |((X+X) |(X+X) ) ) ) ,4) +arpeggio(transpose(transpose(step(shuffle(X) ,12) ,-5) ,-7) ) ) ,12) ) ,12) ) +transpose(arpeggio(transpose(shuffle((X+transpose(transpose(X,4) ,12) ) ) ,-5) ) ,4) ) +transpose((transpose(transpose(shuffle((((transpose(X,4) |((X+transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(transpose((X|X) ,4) ,4) ) +transpose(((((X+X) +(X+transpose(X,12) ) ) +transpose((X|(X|X) ) ,12) ) |(X+X) ) ,7) ) ) ,-5) ,-7) +transpose(transpose(((shuffle((arpeggio(transpose(X,4) ) +transpose(shuffle(transpose(transpose(X,-5) ,-7) ) ,12) ) ) +transpose(echo((((transpose(X,-7) +transpose(transpose(X,4) ,-5) ) +transpose(echo(((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4,6) ,7) ) +((((X+transpose(X,12) ) +transpose(arpeggio(X) ,12) ) |step(X,12) ) +(arpeggio(transpose(X,-5) ) +transpose((transpose(transpose(X,-7) ,-5) +transpose((shuffle(X) +shuffle(X) ) ,12) ) ,7) ) ) ) ,4,6) ,4) ) +transpose(transpose(transpose(shuffle(transpose(transpose((X+X) ,4) ,-7) ) ,-7) ,-5) ,7) ) ,4) ,12) ) ,7) ) +shuffle((((((((((X+transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) |arpeggio(transpose(X,-7) ) ) +transpose((step(step(echo(X,4,6) ,12) ,12) +(X+transpose(transpose(X,4) ,7) ) ) ,4) ) +transpose(echo(shuffle(transpose((X+transpose(X,7) ) ,-5) ) ,4,6) ,7) ) |shuffle(step(transpose(X,-5) ,12) ) ) |shuffle((X+transpose((((transpose(step(X,12) ,4) |shuffle(echo(X,4,6) ) ) +transpose((transpose(shuffle(X) ,4) +transpose((X+X) ,7) ) ,4) ) +transpose((X+transpose((X|X) ,7) ) ,7) ) ,4) ) ) ) +transpose((transpose(((shuffle(X) +transpose((X+transpose(X,7) ) ,7) ) |transpose(transpose((X|transpose(X,-5) ) ,-7) ,4) ) ,-5) +shuffle(shuffle(shuffle(transpose(X,-7) ) ) ) ) ,7) ) +transpose((((shuffle(((shuffle((shuffle(transpose(X,4) ) |echo(transpose(X,-5) ,4,6) ) ) |transpose((X|transpose(X,-7) ) ,-5) ) +((transpose(transpose(X,-5) ,-5) +(echo(X,4,6) +(X+transpose(X,7) ) ) ) |((X+transpose(X,12) ) +(step((X+X) ,12) |transpose(X,-5) ) ) ) ) ) +transpose(step(transpose(transpose(X,4) ,-7) ,12) ,12) ) +transpose(((transpose(arpeggio(transpose(X,-5) ) ,-5) +transpose((transpose(transpose(shuffle(X) ,-5) ,-7) +transpose(shuffle((step(X,12) +transpose(transpose(X,4) ,12) ) ) ,12) ) ,4) ) +transpose(transpose((transpose(X,-5) +X) ,-5) ,7) ) ,4) ) +transpose(transpose((transpose((transpose(X,4) |X) ,4) +transpose(step(shuffle(X) ,12) ,7) ) ,-5) ,7) ) ,12) ) ) ) ) |transpose(arpeggio((((((shuffle((transpose(transpose(X,-5) ,4) +transpose((transpose(transpose(transpose(X,-7) ,-7) ,4) +transpose(echo(X,4,6) ,12) ) ,7) ) ) +transpose(transpose((transpose((X+X) ,4) +shuffle(X) ) ,-5) ,12) ) +transpose(transpose((shuffle(((X+transpose((X+X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,-7) ,7) ) |transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |((X|shuffle(X) ) +transpose(X,7) ) ) ,4) ,-7) ) +transpose(transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(((X|X) +X) ,7) ) ,-5) ) ,-7) ,4) ) +transpose((echo(((((X+transpose(transpose(X,-7) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(shuffle(X) ,7) ) |step(transpose(X,-5) ,12) ) ,4,6) +(shuffle(transpose(((X+((X+transpose(X,7) ) +(X+X) ) ) +transpose(step(X,12) ,12) ) ,-5) ) +transpose(shuffle(transpose((shuffle(X) +transpose(X,4) ) ,4) ) ,7) ) ) ,7) ) ) ,4) ) ) +transpose(((transpose((step((((transpose(shuffle(echo(shuffle(X) ,4,6) ) ,-7) +transpose(transpose(step(((X|X) +(X+transpose(X,7) ) ) ,12) ,-5) ,4) ) +transpose(echo(((echo(X,4,6) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose(X,7) ) ,4,6) ,7) ) |shuffle(transpose(((shuffle(X) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(transpose(X,-7) ,12) ) ,7) ) ,-7) ) ) ,12) |transpose((step((((arpeggio(X) +transpose(transpose(X,-7) ,7) ) |step(X,12) ) +transpose((X+transpose(X,7) ) ,-7) ) ,12) |(transpose((transpose(shuffle(step(X,12) ) ,-5) +transpose(transpose(shuffle((X|X) ) ,-7) ,12) ) ,4) +step(echo(arpeggio(shuffle((X|X) ) ) ,4,6) ,12) ) ) ,-5) ) ,4) +transpose(shuffle(arpeggio((shuffle(echo((transpose((transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) +(transpose((X+transpose(X,12) ) ,-5) +arpeggio(X) ) ) ,-5) |(transpose((((transpose((X+transpose(X,12) ) ,-7) +transpose((X|X) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) |transpose(X,-7) ) ,-5) |((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,4,6) ) +transpose(echo((echo((X+transpose(X,4) ) ,4,6) +transpose(transpose(transpose(transpose(echo(X,4,6) ,4) ,-5) ,-5) ,7) ) ,4,6) ,12) ) ) ) ,4) ) +transpose(step(transpose((((step((((shuffle(shuffle((X+transpose(X,7) ) ) ) +transpose(shuffle(shuffle((X+X) ) ) ,7) ) +((transpose(((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) +transpose(X,-7) ) +transpose(X,-7) ) ) +transpose((step(transpose(X,4) ,12) +((((X+transpose(X,12) ) |(X+X) ) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,12) ) ,12) +transpose(transpose(((((transpose(step((X+X) ,12) ,-5) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-7) ,4) ) +transpose((transpose(X,4) +transpose(echo(arpeggio(X) ,4,6) ,12) ) ,7) ) |shuffle(transpose(shuffle((transpose(X,-5) +(X+transpose(X,7) ) ) ) ,-5) ) ) +echo((transpose((((shuffle(X) +X) |X) |arpeggio((step(X,12) |arpeggio(X) ) ) ) ,-5) +transpose(((shuffle(transpose(transpose(X,-7) ,4) ) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +shuffle(echo((X|X) ,4,6) ) ) +transpose((transpose(((X+X) |X) ,-7) +transpose(transpose((X+X) ,-7) ,12) ) ,12) ) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,12) ) ,4,6) ) ,-5) ,12) ) |shuffle((((step((shuffle(X) +transpose((X+transpose(X,7) ) ,7) ) ,12) |shuffle(shuffle(shuffle((X|X) ) ) ) ) +(transpose(transpose(step((X|arpeggio(X) ) ,12) ,4) ,-7) +transpose(transpose((step(transpose(shuffle(arpeggio((X+transpose(X,12) ) ) ) ,-5) ,12) |((shuffle(transpose(arpeggio(X) ,-5) ) +transpose(shuffle((X|X) ) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ) ,-7) ,7) ) ) +transpose(transpose((step((shuffle((X|echo(X,4,6) ) ) +((((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |(X+X) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose((X+transpose(X,-5) ) ,7) ) ) ,12) +transpose(((((transpose(X,-7) +transpose(step(X,12) ,7) ) +X) +transpose((((X+X) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ) +transpose(((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) +((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,-5) ) ,7) ) ,-7) ,12) ) ) ) +transpose(((arpeggio(((transpose(transpose(((((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +shuffle(arpeggio(X) ) ) +transpose(arpeggio(X) ,12) ) ,-7) ,-7) +transpose(shuffle(shuffle((shuffle(shuffle(echo(X,4,6) ) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) ) ,4) ) +transpose((transpose((echo((X+X) ,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,-7) |((X|X) +transpose(step(shuffle(X) ,12) ,12) ) ) ,7) ) ) +transpose(transpose((shuffle(((transpose(X,-5) +transpose(step(transpose(X,-7) ,12) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +transpose(transpose(transpose(step(((transpose(X,-5) +transpose(X,-5) ) +(echo(X,4,6) |transpose(X,4) ) ) ,12) ,4) ,-5) ,12) ) ,4) ,7) ) +transpose((shuffle((((transpose(X,4) +transpose((shuffle((X+transpose(X,7) ) ) +shuffle(X) ) ,12) ) +transpose(((transpose((X+X) ,-7) +transpose(arpeggio((X+X) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) ,7) ) ,4) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ) |transpose(((transpose(transpose((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |transpose(X,-5) ) ,-5) ,4) |transpose(((X+X) +shuffle(transpose(X,-7) ) ) ,-5) ) |(((((echo(echo(X,4,6) ,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ) +transpose(transpose((X+(X|X) ) ,-5) ,7) ) +transpose((shuffle(shuffle(X) ) +transpose(((step((shuffle(X) |X) ,12) +transpose(arpeggio(transpose(X,-7) ) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) +transpose(shuffle(transpose((((X+transpose(X,7) ) |transpose(X,-5) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) ,4) ) +transpose(transpose(shuffle(transpose((X+X) ,-7) ) ,4) ,7) ) ) ,4) ) ,-5) ) ,7) ) ,4) ,12) ,7) ) ,7) ) random seed used was 112952474

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