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(((transpose(transpose(((((arpeggio(X) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) |(echo(X,4,6) |X) ) +(((transpose(transpose(X,4) ,4) |(X+X) ) +transpose(((X|X) +(X+transpose(X,7) ) ) ,4) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ) ,4) ,-5) +arpeggio((transpose(X,-7) +transpose(arpeggio(echo(step(X,12) ,4,6) ) ,12) ) ) ) |transpose(echo(transpose(transpose(step(transpose(X,-5) ,12) ,4) ,4) ,4,6) ,4) ) ,4) ,-5) |transpose(transpose(echo((((step(transpose((shuffle(shuffle(X) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,12) +(transpose(step(transpose(transpose(X,4) ,-7) ,12) ,-5) +transpose(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ) |(((((transpose((X+transpose(transpose(X,-5) ,7) ) ,-5) +transpose(((X+transpose(X,12) ) +transpose(step(X,12) ,12) ) ,12) ) +(transpose(transpose(X,-5) ,-5) +transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,-7) ,7) ) ) +transpose(echo(((X+transpose(transpose(X,4) ,4) ) +transpose((X|transpose(X,-7) ) ,7) ) ,4,6) ,4) ) +transpose((transpose(transpose(X,4) ,4) +transpose((step(X,12) +step(X,12) ) ,12) ) ,7) ) +((arpeggio((shuffle(X) +transpose(X,-7) ) ) +transpose(arpeggio(transpose(X,-5) ) ,12) ) |(step((X+X) ,12) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ) ) ) +transpose(step(transpose(((transpose((X|X) ,-5) +transpose(step(echo(X,4,6) ,12) ,12) ) +shuffle(X) ) ,-5) ,12) ,12) ) ,4,6) ,-7) ,-7) ) ,4) +transpose(transpose(((step((transpose(((((X|X) +transpose(X,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,7) ) +((((arpeggio(echo(step(X,12) ,4,6) ) +transpose((echo(X,4,6) +(echo(transpose(X,4) ,4,6) +((X+transpose(X,7) ) +transpose((X+X) ,7) ) ) ) ,4) ) +transpose(transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |transpose(X,4) ) ,4) ,7) ) |transpose(((((X+transpose(X,7) ) +transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,-5) ) ,-5) ) +step(((transpose(shuffle(X) ,4) +(X+transpose(transpose(X,-5) ,12) ) ) +echo(transpose(step(X,12) ,-5) ,4,6) ) ,12) ) ) ,-5) +transpose(((transpose(shuffle(((X+(X+X) ) |X) ) ,4) |echo((X+transpose((transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +echo(X,4,6) ) ,-5) +transpose(((((echo(X,4,6) |echo(X,4,6) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) +transpose((((arpeggio(X) +X) +transpose((X|shuffle(X) ) ,4) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,7) ) ,7) ) ,4,6) ) +((echo(((arpeggio(transpose(X,4) ) |(X+X) ) +echo(shuffle(echo(transpose(X,4) ,4,6) ) ,4,6) ) ,4,6) +transpose(transpose((X+(X+transpose(X,12) ) ) ,-5) ,-7) ) +(transpose(echo(step(step(X,12) ,12) ,4,6) ,-5) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,4) ,12) ) ) ) ,7) ) ,12) +transpose(((((transpose(arpeggio(((X+(X|transpose(X,4) ) ) |transpose(transpose(X,-7) ,-5) ) ) ,4) +transpose(((arpeggio(shuffle((X+transpose(X,7) ) ) ) |transpose(step(((step(X,12) +transpose((transpose(X,-7) +transpose((transpose(X,-7) +X) ,7) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,12) ,-5) ) +transpose(transpose(echo(arpeggio((((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +X) |(shuffle(X) |(X+X) ) ) ) ,4,6) ,-7) ,12) ) ,12) ) +transpose(arpeggio((step(arpeggio((step(X,12) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) ) ,12) +transpose(((transpose(((((step(X,12) +transpose((X+transpose(X,12) ) ,12) ) +transpose(((X+transpose((X|X) ,12) ) +transpose(((X+X) |(X+transpose(X,12) ) ) ,12) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) |echo(arpeggio(X) ,4,6) ) ,-7) +transpose(transpose((transpose(X,4) +transpose(X,7) ) ,-5) ,4) ) +transpose(shuffle(transpose(transpose(transpose(transpose(X,-7) ,4) ,-7) ,-7) ) ,7) ) ,-5) ) ) ,7) ) +transpose(shuffle(echo(((transpose(transpose(transpose(arpeggio(shuffle(X) ) ,4) ,-5) ,-7) |echo(((((arpeggio(X) |X) |(X|arpeggio(X) ) ) +transpose((transpose((((X+transpose(shuffle(X) ,12) ) +transpose(transpose((X|X) ,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) |shuffle((X+X) ) ) ,4) ) +transpose(shuffle((transpose((transpose(X,4) |step(X,12) ) ,-5) +transpose(X,-5) ) ) ,7) ) ,4,6) ) +transpose(arpeggio(((X+X) |transpose(shuffle((X+transpose(X,7) ) ) ,-5) ) ) ,12) ) ,4,6) ) ,12) ) |transpose((((shuffle(((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +X) ) +transpose(echo((X+transpose(X,-7) ) ,4,6) ,12) ) +transpose((shuffle(transpose(X,-7) ) |(X+transpose(X,7) ) ) ,-5) ) ) +transpose(transpose(arpeggio(echo(X,4,6) ) ,4) ,4) ) +transpose(transpose(((echo(transpose(X,-5) ,4,6) +transpose(((X+X) |transpose(X,-7) ) ,4) ) +transpose((echo(transpose((X|X) ,-5) ,4,6) +transpose(step(step(transpose(X,4) ,12) ,12) ,7) ) ,7) ) ,-7) ,7) ) +transpose((transpose(transpose((transpose((X+transpose(X,7) ) ,-5) |(X+transpose(X,7) ) ) ,4) ,4) |transpose(((arpeggio(X) +(arpeggio(X) +transpose((X+X) ,12) ) ) +transpose(step((X|(X+X) ) ,12) ,12) ) ,4) ) ,7) ) ,-7) ) ,12) ) +(transpose((echo(((step(transpose(step(echo((X|(X+X) ) ,4,6) ,12) ,-5) ,12) +transpose((((((X|X) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) +transpose(echo((shuffle(X) +transpose(X,12) ) ,4,6) ,4) ) +transpose(((X+transpose(X,-5) ) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose((X+X) ,7) ) ,7) ) ,7) ) |transpose(transpose(echo(transpose((X+X) ,-7) ,4,6) ,4) ,-7) ) ,12) ) +transpose(transpose(transpose(((echo(step(X,12) ,4,6) +transpose((((step((X+transpose(X,12) ) ,12) +transpose(((X|X) |(X+transpose(X,7) ) ) ,4) ) +transpose((step(X,12) +transpose(step(X,12) ,7) ) ,7) ) |transpose(echo(transpose(X,-5) ,4,6) ,-7) ) ,4) ) +transpose((step((X|X) ,12) +((X+X) +arpeggio(X) ) ) ,7) ) ,-5) ,-7) ,7) ) ,4,6) +shuffle(echo(shuffle(((transpose(X,-7) +transpose((transpose(echo(X,4,6) ,-7) +transpose(shuffle((X|X) ) ,7) ) ,4) ) +transpose(transpose(step(transpose(X,-5) ,12) ,4) ,7) ) ) ,4,6) ) ) ,-7) |(((transpose(transpose(transpose(X,-7) ,-7) ,-7) +transpose(shuffle(step(((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,4) ) +transpose(shuffle((transpose(shuffle(((step(X,12) +transpose(transpose(X,4) ,7) ) +transpose(X,-5) ) ) ,4) +transpose(transpose((transpose((X+transpose(transpose(X,-5) ,12) ) ,-5) +transpose(step(X,12) ,-5) ) ,-7) ,7) ) ) ,7) ) +transpose(((((transpose((transpose(shuffle(X) ,4) |(X+transpose(X,7) ) ) ,-7) +transpose(shuffle(step(echo((echo(transpose(X,4) ,4,6) +transpose((transpose((X|X) ,4) +step((X+transpose(X,12) ) ,12) ) ,12) ) ,4,6) ,12) ) ,4) ) +transpose(transpose(((arpeggio(transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) |transpose((step(X,12) +transpose(X,12) ) ,-5) ) |transpose(((transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4) +transpose(transpose((shuffle((X|X) ) |transpose(transpose(X,-7) ,4) ) ,4) ,4) ) +transpose(transpose(step(echo(arpeggio(X) ,4,6) ,12) ,4) ,7) ) ,-5) ) ,-5) ,7) ) +transpose((transpose((((transpose((echo(X,4,6) +X) ,-7) +transpose((transpose((X+X) ,-5) |transpose(echo(X,4,6) ,-7) ) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) +transpose((X+transpose(X,12) ) ,-5) ) ,4) +transpose(transpose(((((step(transpose(X,-5) ,12) |(echo((X+transpose(X,7) ) ,4,6) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) |transpose((((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) |((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) +transpose((((transpose(echo(X,4,6) ,-5) |((X+transpose(X,7) ) +(arpeggio(X) +transpose(X,-7) ) ) ) +(X|(transpose(X,-5) +transpose(X,-7) ) ) ) +transpose(((transpose(X,4) +((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) ) |shuffle((transpose(X,-5) +transpose(echo(X,4,6) ,12) ) ) ) ,7) ) ,4) ) +transpose((transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) +transpose((((((X+X) +X) +(X|X) ) +shuffle(transpose(X,4) ) ) +transpose(transpose((arpeggio(X) +transpose(transpose(X,-5) ,12) ) ,4) ,12) ) ,7) ) ,7) ) ,4) ,7) ) ,4) ) +transpose(transpose(step(((((transpose((X|X) ,4) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) +transpose(arpeggio(transpose(X,-5) ) ,12) ) +transpose((arpeggio(X) |echo(echo((transpose(X,4) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,4,6) ) ,4) ) +transpose((echo(transpose(X,-5) ,4,6) +transpose(transpose((X+transpose(echo(X,4,6) ,7) ) ,-5) ,12) ) ,7) ) ,12) ,4) ,7) ) ,7) ) ) ) ,-7) ,4) ) random seed used was 236137173

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