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((X|(((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) +transpose((arpeggio(X) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,-5) +transpose(((arpeggio(((X+transpose(X,12) ) |X) ) +transpose(transpose(transpose(((X+transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ,-7) ,-5) ,7) ) +transpose((X+transpose(step(X,12) ,7) ) ,4) ) ,12) ) +transpose((transpose(((((step(X,12) |X) +((X+X) +X) ) +step((X|X) ,12) ) |transpose(transpose((transpose((transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) ,-7) +transpose(echo((transpose(X,-5) +transpose(X,4) ) ,4,6) ,7) ) ,-5) ,4) ) ,-5) +(echo((transpose(step(((X+transpose(X,7) ) |(transpose(X,-7) +X) ) ,12) ,4) |echo(X,4,6) ) ,4,6) +arpeggio((transpose(transpose((X|X) ,-5) ,-5) |echo((X|arpeggio(X) ) ,4,6) ) ) ) ) ,12) ) +((transpose(transpose((((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) |transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) ) ,-7) ,4) +transpose((transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) +transpose(((((transpose(transpose(X,4) ,-5) +transpose(X,7) ) +(arpeggio((X+X) ) +transpose(X,7) ) ) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose((transpose(X,-5) |X) ,7) ) ,4) ) ,7) ) +transpose(arpeggio((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,-5) +transpose((((X+transpose(X,4) ) |X) +transpose(transpose(X,4) ,12) ) ,12) ) ) ,12) ) ) |(step(transpose(transpose(arpeggio(transpose((arpeggio(arpeggio(X) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,4) ) ,-7) ,4) ,12) +transpose(echo((arpeggio(transpose(transpose((X+(shuffle(X) |arpeggio(X) ) ) ,4) ,-5) ) |(transpose(X,-7) +(echo(X,4,6) |echo(X,4,6) ) ) ) ,4,6) ,7) ) ) +transpose(transpose(transpose(((step(echo(arpeggio(X) ,4,6) ,12) |(arpeggio(transpose((X|X) ,-7) ) +transpose((X+transpose(X,-7) ) ,4) ) ) +transpose(shuffle(((arpeggio(arpeggio(transpose(arpeggio(X) ,-5) ) ) +transpose(transpose(transpose(X,4) ,-5) ,12) ) +arpeggio((step(X,12) +(X+transpose(X,12) ) ) ) ) ) ,12) ) ,4) ,-5) ,4) ) +transpose((((((step(transpose((X+step(X,12) ) ,-7) ,12) |(transpose(step(arpeggio(echo(X,4,6) ) ,12) ,-5) +transpose(echo((transpose((X|X) ,-5) +(((X+X) +transpose(((shuffle(X) +transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) ,4,6) ,12) ) ) +transpose((transpose((shuffle((((X+transpose(X,12) ) |step(X,12) ) |transpose(X,4) ) ) +transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ,-5) ) ,-5) +transpose(transpose(((transpose(transpose(transpose(X,4) ,4) ,-5) +transpose(arpeggio(arpeggio(X) ) ,4) ) +transpose(transpose((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,4) ,12) ) ,7) ) +echo(((transpose(step((shuffle(X) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ,12) ,-5) |echo(transpose((X|(X+transpose(X,7) ) ) ,-5) ,4,6) ) +transpose(((transpose(transpose((echo(transpose(X,-7) ,4,6) +step(transpose(X,-7) ,12) ) ,4) ,-7) +transpose(transpose((echo(transpose(transpose(X,-7) ,-7) ,4,6) +transpose(transpose((arpeggio(X) |transpose(X,-5) ) ,4) ,7) ) ,-5) ,12) ) |((transpose((X|X) ,-5) +transpose(transpose(((((X|X) |(X+transpose(X,12) ) ) +transpose(X,7) ) |(transpose(X,-7) +step(X,12) ) ) ,4) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,12) ) ,4,6) ) +transpose(transpose((((transpose((X+transpose(echo(X,4,6) ,12) ) ,-7) +transpose(echo(((X+transpose((step(X,12) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose((X+transpose(echo(X,4,6) ,12) ) ,7) ) ,4,6) ,-5) ) +step(shuffle((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(transpose((X+X) ,-7) ,7) ) ) ,12) ) +transpose(transpose(((step(((X+X) +transpose(step(X,12) ,7) ) ,12) +transpose((X|X) ,7) ) +transpose(transpose(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,-7) ,12) ) ,4) ,12) ) ,4) ,4) ) +transpose((transpose(arpeggio(transpose(((transpose(((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ,4) +transpose(echo(X,4,6) ,4) ) +transpose(((((X+transpose((X+transpose(X,12) ) ,7) ) +transpose((X|X) ,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) ,4) +(transpose(shuffle((((X|X) +transpose(shuffle(X) ,12) ) +(X|X) ) ) ,-5) +transpose((transpose((transpose(X,-5) +X) ,-7) |shuffle(step(X,12) ) ) ,7) ) ) ,7) ) ,7) ) |transpose((transpose(transpose(transpose(((((shuffle(((X+transpose((X+X) ,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) |(((X+transpose(X,7) ) +transpose((transpose(X,4) |X) ,4) ) +transpose(((step(X,12) |transpose(X,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,7) ) ) +transpose(arpeggio(step(X,12) ) ,7) ) +transpose(((((((X+transpose(X,12) ) +transpose(((((X|X) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose(transpose((echo(X,4,6) +transpose(X,12) ) ,-7) ,4) ) +transpose(((step(X,12) |transpose((X+X) ,-7) ) +transpose(transpose(X,-5) ,-7) ) ,7) ) +transpose(transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ,-7) ,4) ) +transpose(transpose(((step(shuffle(X) ,12) +transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(((X+X) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,7) ) ,-5) ,7) ) ,4) ) +transpose(((X+(((X+arpeggio(X) ) +transpose(X,4) ) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) ) |transpose(transpose(step(X,12) ,-7) ,-5) ) ,7) ) ,4) ,4) ,4) |echo((transpose(transpose((transpose(echo((transpose((X+X) ,-5) +transpose((X|transpose(X,4) ) ,7) ) ,4,6) ,-7) |(step((X+X) ,12) +transpose(transpose(X,-5) ,-5) ) ) ,-7) ,-7) +arpeggio(transpose((((arpeggio(X) +transpose(X,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ,4) ) ) ,4,6) ) ,-5) ) |(echo(echo(step(((arpeggio(X) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,12) ,4,6) ,4,6) +transpose(((transpose(transpose(transpose(echo((((X+transpose((X+transpose(X,7) ) ,12) ) +transpose((X+X) ,7) ) +transpose((transpose(X,4) |step(X,12) ) ,4) ) ,4,6) ,-5) ,-7) ,-7) +transpose(echo(transpose(((((arpeggio(arpeggio((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +arpeggio(transpose(X,-5) ) ) ) ) +transpose((transpose((((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(X,7) ) +transpose(transpose(step(transpose(X,4) ,12) ,-5) ,12) ) +arpeggio(shuffle((((X|X) +transpose(X,4) ) +transpose(X,7) ) ) ) ) ,4) +transpose((((X+transpose(shuffle(X) ,4) ) +transpose(step(X,12) ,7) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ) ,7) ) ,4) ) +transpose(transpose(transpose(((echo((X+transpose(arpeggio(X) ,7) ) ,4,6) +transpose((shuffle(X) |step(X,12) ) ,4) ) +transpose(((transpose(X,4) +transpose(X,-7) ) |((X|X) +transpose(X,7) ) ) ,7) ) ,-5) ,-7) ,7) ) +transpose((echo((transpose((transpose(transpose(transpose(X,4) ,4) ,-5) |((X+transpose(X,12) ) +(X+X) ) ) ,-5) +transpose((echo((X+X) ,4,6) |shuffle(X) ) ,12) ) ,4,6) |(((X|((X+transpose(X,7) ) +((X|X) +transpose(shuffle(X) ,12) ) ) ) |echo(transpose(step(transpose(X,4) ,12) ,4) ,4,6) ) +transpose((((transpose((X+X) ,-7) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(arpeggio((arpeggio(X) |(X+transpose(X,12) ) ) ) ,7) ) |transpose((transpose(step(X,12) ,4) +X) ,-5) ) ,7) ) ) ,12) ) +transpose((((transpose((step(transpose(X,4) ,12) +shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ) ) ,4) |transpose(transpose(transpose(transpose(X,4) ,4) ,4) ,-5) ) |transpose(((shuffle((step(X,12) +X) ) +echo(transpose(X,-7) ,4,6) ) |transpose((X+transpose(X,-5) ) ,4) ) ,-5) ) +transpose((((((arpeggio(X) |step(X,12) ) |shuffle(((X+transpose(X,7) ) +transpose(X,-5) ) ) ) |arpeggio(transpose((X+(X+transpose(X,7) ) ) ,-5) ) ) +transpose(transpose(transpose((transpose((X+(X+transpose(X,12) ) ) ,4) +transpose(((X+X) +transpose(X,-5) ) ,-5) ) ,-7) ,-7) ,12) ) |(transpose(echo(X,4,6) ,4) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,12) ) ) ,12) ) ,7) ) ,-7) ,4,6) ,4) ) +transpose((((((((echo(((X|X) |(X+transpose((X+X) ,12) ) ) ,4,6) +transpose(transpose(((transpose((X+X) ,4) +transpose((step(X,12) +(echo(X,4,6) |step(X,12) ) ) ,4) ) +transpose((step(X,12) +transpose((X+X) ,7) ) ,7) ) ,4) ,12) ) +transpose(transpose(step(step((((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) |((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,12) ,12) ,-5) ,7) ) +transpose(arpeggio(transpose((echo(transpose(X,-5) ,4,6) +transpose(X,7) ) ,-7) ) ,-7) ) +(((((transpose((echo(X,4,6) +X) ,-5) +shuffle(transpose(X,4) ) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(transpose(((transpose((X+transpose(X,12) ) ,-5) +(((X|X) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) ) +transpose(transpose(X,4) ,12) ) ,4) ,-5) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) ,-7) ,7) ) +transpose(transpose(shuffle(echo((((echo(arpeggio(X) ,4,6) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) ) ,-5) ,12) ) ) |transpose((((((step(X,12) |X) +transpose(((shuffle(X) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,7) ) +transpose((echo(shuffle(X) ,4,6) +transpose(transpose(transpose(X,-5) ,4) ,-7) ) ,4) ) +transpose(echo((echo(X,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,7) ) +((X|(((X|X) |(X+transpose(X,7) ) ) +transpose(X,-5) ) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,-7) ) ) ,-7) ) +transpose(step(step(((transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) +transpose(step((step((X+transpose(X,4) ) ,12) +transpose(echo((X+X) ,4,6) ,12) ) ,12) ,4) ) +transpose(transpose(transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,-7) ,-7) ,7) ) ,12) ,12) ,-7) ) +transpose(arpeggio(transpose((transpose(shuffle(transpose(((step(step(X,12) ,12) +transpose(((X+transpose(X,12) ) +transpose(X,-7) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,-7) ) ,-7) |transpose(shuffle(transpose(shuffle((step(X,12) |step(X,12) ) ) ,4) ) ,-7) ) ,4) ) ,12) ) ,7) ) ,12) ) ) ,-5) ,-7) random seed used was 167824899

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