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(((echo(((transpose(shuffle(step(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose((X|X) ,-5) ,12) ) ) ,12) ) ,-5) +transpose((shuffle(transpose(transpose((shuffle(arpeggio(transpose(X,-5) ) ) |echo(echo(X,4,6) ,4,6) ) ,4) ,-5) ) |(step((step(shuffle(transpose(transpose(X,4) ,-5) ) ,12) +transpose((transpose(((X+X) +transpose(transpose(X,4) ,7) ) ,-5) +transpose(X,-7) ) ,12) ) ,12) +shuffle(((arpeggio(shuffle(echo(transpose(X,4) ,4,6) ) ) +transpose(step(transpose((((transpose(X,4) |X) +step(X,12) ) +arpeggio(X) ) ,4) ,12) ,4) ) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,7) ) ) ) ) ,4) ) +transpose(arpeggio(((transpose(echo((X+X) ,4,6) ,-7) +transpose(shuffle((X+X) ) ,7) ) +(shuffle(echo(transpose(step(X,12) ,-5) ,4,6) ) +transpose((transpose(shuffle(shuffle(X) ) ,-7) |arpeggio(X) ) ,12) ) ) ) ,7) ) ,4,6) +transpose(transpose((((shuffle(transpose(shuffle(step(transpose(transpose(X,-7) ,-5) ,12) ) ,-5) ) +transpose((((transpose(transpose(X,-7) ,-7) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) +transpose(X,-5) ) +transpose((shuffle(echo(X,4,6) ) +transpose(echo(X,4,6) ,4) ) ,4) ) ,7) ) |(shuffle(transpose((X+transpose(((transpose(X,-7) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ,7) ) ,-7) ) |(shuffle(transpose((((X+X) |shuffle(X) ) |(X|(X+X) ) ) ,4) ) +transpose(shuffle((transpose((shuffle(X) +transpose((transpose(X,-7) +transpose(X,4) ) ,12) ) ,-7) +transpose((transpose(X,-5) +((((X|X) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X|X) ,12) ) ) ,7) ) ) ,12) ) ) ) +transpose(transpose(((shuffle(transpose((transpose((transpose(X,-5) +transpose((X|X) ,7) ) ,-7) |step(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4) ,12) ) ,-7) ) +transpose(((step(echo(transpose(transpose((X+X) ,-7) ,-5) ,4,6) ,12) +shuffle(((X+transpose(shuffle(arpeggio((X+X) ) ) ,12) ) +transpose((((step(X,12) +arpeggio(X) ) |step(X,12) ) +(X|echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ) ,7) ) ) ) +transpose((transpose(X,4) |echo((X+transpose((X+X) ,7) ) ,4,6) ) ,-7) ) ,4) ) +transpose(((X+transpose(shuffle((X|X) ) ,12) ) +transpose(shuffle(step(shuffle(X) ,12) ) ,12) ) ,7) ) ,-7) ,12) ) ,4) ,4) ) +transpose(transpose(((transpose(transpose(transpose(arpeggio((transpose((X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,-5) |X) ) ,-7) ,-5) ,-5) +arpeggio(transpose(((((shuffle(X) |(X+X) ) |arpeggio(X) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X|shuffle(X) ) ,7) ) ,4) ) ) +transpose(((transpose(transpose(X,-5) ,-7) |shuffle((shuffle((X+transpose(X,12) ) ) +transpose(shuffle(shuffle(X) ) ,12) ) ) ) |transpose(transpose(transpose(shuffle((X|X) ) ,-7) ,-5) ,4) ) ,-5) ) ,-5) ,7) ) ,-5) |(step((transpose(echo(((((shuffle(X) +transpose(X,-5) ) +transpose(arpeggio(X) ,4) ) +transpose(shuffle(transpose((X+transpose(X,12) ) ,-7) ) ,7) ) +transpose(transpose((X+X) ,-7) ,12) ) ,4,6) ,-7) |transpose((((transpose(shuffle(shuffle(transpose(step((X+transpose(((transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) +transpose((transpose(shuffle(X) ,-5) |((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,12) ,-7) ) ) ,-5) +transpose(step((((((shuffle(X) +transpose(X,7) ) +transpose(transpose(shuffle(X) ,4) ,12) ) |(X+shuffle(X) ) ) +transpose(shuffle(((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +step(transpose(X,-7) ,12) ) +transpose(((X+transpose(X,12) ) +shuffle(X) ) ,12) ) ) ,12) ) +transpose((((transpose(X,4) +transpose(((X|X) |(X+X) ) ,12) ) +transpose((X+transpose(X,-5) ) ,12) ) +transpose(transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,12) ) ,7) ) ,12) ,4) ) +transpose(transpose(((echo(shuffle((step(X,12) +transpose(transpose((X+X) ,4) ,7) ) ) ,4,6) +transpose((arpeggio(transpose(X,-7) ) |(echo(transpose(X,-7) ,4,6) |arpeggio(X) ) ) ,4) ) +transpose(((transpose(transpose(transpose(transpose(X,-7) ,4) ,-7) ,4) +transpose(shuffle(shuffle((X|X) ) ) ,4) ) +transpose(transpose((transpose(step((transpose(X,-7) |X) ,12) ,-7) +transpose(transpose((arpeggio(X) |echo(((X+transpose(shuffle(X) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ) ,-5) ,12) ) ,4) ,7) ) ,7) ) ,4) ,7) ) +((step((transpose(shuffle(transpose(X,-5) ) ,-7) +transpose(transpose((step(transpose((X+transpose(X,7) ) ,-5) ,12) +echo((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ) ,-5) ,7) ) ,12) |shuffle(transpose((transpose(transpose(X,-5) ,4) +transpose((transpose(X,-5) +transpose((X+transpose(((X+X) +transpose(shuffle(X) ,7) ) ,12) ) ,12) ) ,12) ) ,4) ) ) |((echo((step((transpose(X,-7) +(((X+X) |X) +(X+transpose(X,-7) ) ) ) ,12) +step(((transpose(transpose((X|X) ,-7) ,-5) +transpose((((transpose(X,-5) +X) +transpose(step(X,12) ,7) ) +transpose((((transpose(X,4) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) +transpose(transpose(X,-5) ,12) ) ,7) ) ,4) ) +transpose(((transpose(X,-5) +X) +(echo((X|X) ,4,6) +(X+X) ) ) ,7) ) ,12) ) ,4,6) +transpose((transpose(transpose(shuffle(X) ,-7) ,-7) |((transpose(transpose(step(X,12) ,4) ,-5) +transpose(shuffle(echo(X,4,6) ) ,7) ) +transpose((transpose(((X+transpose(transpose(X,-7) ,12) ) +transpose(step(shuffle(X) ,12) ,7) ) ,4) |(shuffle(echo(((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,4,6) ) +arpeggio(X) ) ) ,12) ) ) ,4) ) +transpose((((((((shuffle(X) +shuffle(transpose(X,4) ) ) +transpose((((((X+transpose(X,12) ) |transpose(X,4) ) +shuffle((X|X) ) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) ,4) ) +transpose(((arpeggio(arpeggio(X) ) +transpose(X,-7) ) +transpose(((X+transpose(X,7) ) +step(X,12) ) ,7) ) ,7) ) +transpose(step(transpose(echo(transpose(shuffle(X) ,-7) ,4,6) ,4) ,12) ,7) ) +transpose(((shuffle((shuffle(transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose((((X|X) +(X+transpose((X+transpose(X,12) ) ,7) ) ) |transpose(transpose(X,-5) ,-5) ) ,4) ) +transpose(transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,7) ) ,4) ) +transpose(((transpose(shuffle(transpose((X+X) ,-7) ) ,4) +transpose(transpose(transpose(arpeggio(X) ,-7) ,-7) ,4) ) +transpose(shuffle((X+X) ) ,7) ) ,7) ) |step(transpose(step((X+transpose(X,7) ) ,12) ,4) ,12) ) ,7) ) ) ) ,4) ) ,12) |arpeggio((transpose(step(arpeggio((transpose(transpose((arpeggio(((transpose(step(X,12) ,-5) +transpose((arpeggio(transpose(X,4) ) +shuffle(echo(X,4,6) ) ) ,12) ) +echo(transpose(step(transpose(X,4) ,12) ,-5) ,4,6) ) ) +transpose((X|X) ,12) ) ,4) ,4) |(transpose((shuffle(shuffle(transpose(X,-5) ) ) |transpose(echo(shuffle(X) ,4,6) ,-5) ) ,4) +transpose(((shuffle(((shuffle(transpose(X,-5) ) +transpose(arpeggio(((X+transpose(X,7) ) |step(X,12) ) ) ,7) ) +transpose(transpose(transpose(X,4) ,-7) ,12) ) ) +transpose(((transpose(transpose(shuffle((X|shuffle(X) ) ) ,-5) ,4) +transpose(((transpose(((X+(X+transpose(X,7) ) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,4) |echo((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(step(X,12) ,4) ) ,4,6) ) |step(transpose(X,-7) ,12) ) ,4) ) +transpose(((shuffle((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ) +transpose(((step(shuffle(X) ,12) +transpose(arpeggio(transpose(X,-7) ) ,4) ) +transpose(step(shuffle(X) ,12) ,7) ) ,12) ) +((((X|shuffle(X) ) +(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) |transpose(((X|X) |(X+transpose(X,7) ) ) ,-7) ) +((shuffle(shuffle(X) ) |(X|transpose(X,-5) ) ) +arpeggio(X) ) ) ) ,7) ) ,12) ) |(((((((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) +echo((X+transpose(X,7) ) ,4,6) ) +transpose((transpose(shuffle(X) ,4) |X) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) +(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ,-5) +transpose(((((X+transpose(X,7) ) |X) |step(X,12) ) +transpose(transpose(shuffle(transpose(X,4) ) ,4) ,12) ) ,12) ) ) ) ,12) ) ) ) ,12) ,4) |shuffle(transpose(step(shuffle((shuffle(shuffle((shuffle(transpose((shuffle(step(X,12) ) |((X|X) |X) ) ,-5) ) +transpose(((shuffle(X) +transpose(((step(X,12) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose((X|shuffle(X) ) ,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ) ) ) +shuffle(echo((transpose((step(arpeggio(((shuffle(X) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,12) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,-7) +((((echo((((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) +(X|X) ) ,4,6) +transpose(transpose(((transpose((X+transpose(X,12) ) ,-7) +transpose(((X+transpose(X,12) ) |(X|X) ) ,4) ) +transpose((transpose(X,4) +transpose(transpose(X,-5) ,12) ) ,7) ) ,-5) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) +transpose((((transpose((X|X) ,-5) |transpose(transpose(X,4) ,-5) ) |transpose(X,4) ) +transpose((echo(transpose((transpose(X,-7) +transpose(transpose(X,-7) ,7) ) ,4) ,4,6) +transpose(transpose(X,4) ,-5) ) ,12) ) ,4) ) +transpose(step(transpose(arpeggio(((echo(X,4,6) +shuffle(X) ) +(X+X) ) ) ,4) ,12) ,7) ) ) ,4,6) ) ) ) ,12) ,4) ) ) ) ) ) ,-5) random seed used was 224589907

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