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: (shuffle(echo((((arpeggio((transpose(((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) +transpose((X+transpose(X,4) ) ,7) ) ,-5) +transpose(((step(X,12) +transpose(transpose(X,-5) ,12) ) +shuffle((shuffle(X) +transpose(arpeggio(X) ,7) ) ) ) ,12) ) ) +transpose(echo(step(((X+transpose((X+step(X,12) ) ,4) ) +transpose((X|X) ,7) ) ,12) ,4,6) ,4) ) +transpose(transpose(transpose((transpose(((transpose((transpose(X,4) +(X|X) ) ,-7) +transpose(arpeggio(X) ,7) ) +transpose(transpose((X|transpose(X,-7) ) ,-5) ,12) ) ,-7) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +echo(X,4,6) ) +((X+transpose((X+transpose(X,7) ) ,7) ) |transpose(arpeggio(X) ,4) ) ) ,-7) ,12) ) ,-7) ,-7) ,7) ) +transpose((((step((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(transpose(X,-7) +transpose(X,7) ) ) ,4) +transpose(transpose(((transpose((X+transpose(X,12) ) ,4) +arpeggio(transpose(X,4) ) ) +transpose(shuffle(X) ,12) ) ,4) ,7) ) ,12) +((((transpose((arpeggio((X+transpose(X,7) ) ) |arpeggio(X) ) ,-5) +transpose(echo(transpose(arpeggio(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ) ,-5) ,4,6) ,12) ) +transpose(transpose(transpose(((X+transpose(X,7) ) +transpose(((X+X) +transpose(X,4) ) ,7) ) ,-5) ,-7) ,4) ) +transpose(transpose((transpose(X,4) +transpose((transpose(transpose(X,-7) ,4) +transpose(((X|X) |transpose((X|X) ,-7) ) ,7) ) ,12) ) ,-7) ,7) ) +(transpose(((((X+X) |X) +transpose(arpeggio(X) ,12) ) +transpose(echo((transpose(X,-5) +(X|X) ) ,4,6) ,12) ) ,-5) |transpose((transpose(transpose(X,-7) ,-7) +transpose(arpeggio(X) ,-7) ) ,-5) ) ) ) +transpose(transpose(transpose(arpeggio(transpose(X,-5) ) ,4) ,4) ,-5) ) |arpeggio(transpose((transpose(transpose(transpose(X,-5) ,4) ,4) |transpose(shuffle(transpose(X,-5) ) ,-7) ) ,-7) ) ) ,12) ) ,4,6) ) |((transpose((((transpose(step(((X|X) |(transpose(X,-5) |X) ) ,12) ,-5) |(arpeggio((echo(X,4,6) |(X+X) ) ) +transpose(transpose((X|X) ,-5) ,7) ) ) |step(transpose(transpose(((X+X) +X) ,4) ,-7) ,12) ) +((transpose(step((((transpose(transpose(X,4) ,-7) +transpose(step(X,12) ,7) ) |transpose(echo((X|X) ,4,6) ,-7) ) +(transpose(step(X,12) ,4) |((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) ) ,12) ,-7) +transpose((shuffle(transpose(X,-5) ) +transpose(step((transpose((X+X) ,-7) |(X+transpose(arpeggio(X) ,7) ) ) ,12) ,-7) ) ,7) ) |(echo(((((transpose(transpose(X,-5) ,-5) +transpose((step((X|X) ,12) |transpose(X,-7) ) ,4) ) +transpose(arpeggio((X+X) ) ,7) ) +transpose(echo((((X|X) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ,4) ) +transpose(step((arpeggio(X) |(X+X) ) ,12) ,7) ) ,4,6) +transpose(((echo(((transpose(transpose(X,-5) ,-5) +transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose((shuffle(X) +transpose((X+X) ,12) ) ,7) ) ,4,6) +transpose(((X+transpose((X+transpose(X,7) ) ,12) ) |X) ,12) ) |transpose(((X|transpose((X|X) ,4) ) +(transpose(X,-7) +step(shuffle(X) ,12) ) ) ,-5) ) ,7) ) ) ) ,4) +transpose((((transpose(step(transpose((step((transpose(transpose(((X|X) +echo((X|X) ,4,6) ) ,-5) ,-7) +transpose((shuffle(step(transpose(X,4) ,12) ) +transpose((transpose(((X+X) +transpose(X,12) ) ,4) |(X+X) ) ,12) ) ,12) ) ,12) +transpose(((shuffle(transpose((X+transpose(X,12) ) ,-5) ) +transpose(echo(transpose(transpose((transpose(X,-7) +transpose((X+X) ,-5) ) ,4) ,4) ,4,6) ,12) ) |((X+(X+X) ) +transpose((transpose(shuffle(X) ,-7) +transpose(X,12) ) ,12) ) ) ,7) ) ,-7) ,12) ,-5) +transpose(transpose((transpose((step(transpose(X,-7) ,12) +(arpeggio((X+transpose(X,-5) ) ) +((arpeggio((X+transpose(X,7) ) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) ) ,-5) +transpose((transpose(X,-5) +transpose(step(X,12) ,12) ) ,12) ) ,-5) ,4) ) +transpose((transpose((transpose((transpose(transpose(((X+transpose(((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ,-5) +transpose(transpose(transpose((transpose((X|X) ,4) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) ) ,-7) ,4) ,12) ) ,-7) +transpose(((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(X,7) ) ,-5) |transpose(echo(transpose(X,4) ,4,6) ,-7) ) |(((((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) +transpose(transpose(step(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ,-5) ,12) ,-7) ,7) ) ) ,4) ) ,-5) +((((((((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) +(X+X) ) |step((transpose(X,4) +transpose(transpose(X,4) ,7) ) ,12) ) +transpose((transpose(X,4) +transpose(X,12) ) ,-5) ) +((((X|X) +transpose(((X+X) +(X+transpose(X,12) ) ) ,12) ) +transpose(((shuffle(transpose(X,-5) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) +(arpeggio(shuffle(shuffle(X) ) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ) ) +transpose(transpose(transpose((transpose((X+transpose(X,12) ) ,4) +transpose(shuffle(((transpose(X,-7) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ,-7) ,-7) ,4) ) +transpose((transpose(((((X|X) |transpose(X,4) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |step((X|X) ,12) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,-5) +((echo(X,4,6) |X) +transpose(X,7) ) ) ,7) ) +transpose((((shuffle(transpose(transpose(X,-5) ,-7) ) +transpose(transpose(transpose(step(transpose((X+transpose(X,7) ) ,-7) ,12) ,-5) ,4) ,4) ) +transpose(arpeggio((transpose((X+X) ,4) |step(shuffle(X) ,12) ) ) ,7) ) |transpose(transpose(((transpose(X,4) +transpose(X,4) ) |X) ,4) ,4) ) ,4) ) +transpose(step((((transpose(((shuffle(X) +arpeggio(X) ) +transpose(transpose((X|X) ,-5) ,7) ) ,4) +transpose(((shuffle((transpose(X,-7) +transpose(X,7) ) ) +transpose(X,4) ) +transpose((transpose(X,4) +transpose(step(transpose(X,-5) ,12) ,12) ) ,7) ) ,4) ) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) |(((transpose(transpose(transpose(X,4) ,-5) ,4) |((transpose(X,4) +X) +(((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +(transpose(X,-5) +(X+X) ) ) ) ) +echo(((X|(X|X) ) +transpose(((shuffle(X) |transpose(X,-5) ) +(X+transpose(X,7) ) ) ,12) ) ,4,6) ) +transpose(transpose(((((((X+transpose(X,12) ) +step(X,12) ) |transpose(X,4) ) +transpose((transpose(X,4) +X) ,4) ) +transpose((step(X,12) +transpose((X+X) ,7) ) ,7) ) +transpose(arpeggio((transpose(X,-5) +echo(X,4,6) ) ) ,7) ) ,-7) ,12) ) ) ,12) ,7) ) ) ,7) ) |transpose(transpose(transpose(step((((X+transpose((X+X) ,12) ) +transpose(transpose(X,-7) ,7) ) +transpose((X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ,12) ) ,12) ,-5) ,-5) ,4) ) ,4) ) +transpose(transpose((((((shuffle((((transpose(X,4) +(shuffle(transpose(X,-7) ) |echo(X,4,6) ) ) +transpose(transpose((X+X) ,4) ,7) ) +transpose(((transpose(transpose(X,4) ,-5) +transpose(X,4) ) +transpose((X+transpose(transpose(X,4) ,7) ) ,7) ) ,7) ) ) +transpose(transpose((X+X) ,4) ,4) ) +transpose((transpose((echo(transpose(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) +transpose((transpose((X+transpose(X,7) ) ,4) +transpose(((X+transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,7) ) ,4) ,4,6) +transpose((((((X+transpose(X,7) ) |shuffle(X) ) +transpose((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(((X|X) +shuffle(X) ) ,7) ) |transpose(echo(X,4,6) ,4) ) ,12) ) ,-7) +transpose((((((X|(X|X) ) +transpose(X,7) ) +(X+transpose(((X|X) +transpose(X,12) ) ,7) ) ) +(((X|(X+transpose(X,12) ) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) |((X|(X+transpose(X,12) ) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) +shuffle(echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) ) ) ,7) ) ,4) ) +transpose((((transpose(((X+transpose(X,12) ) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ,7) ) ,7) ) ,-7) +transpose((transpose((X|X) ,-5) |shuffle(transpose(transpose((X+X) ,4) ,-5) ) ) ,12) ) +transpose(arpeggio(transpose(((((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +arpeggio(arpeggio(shuffle(X) ) ) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((echo(X,4,6) +transpose(X,-7) ) ,7) ) ,-5) ) ,4) ) +transpose(transpose(shuffle((step(transpose(X,4) ,12) |((echo(X,4,6) +transpose(((X|transpose(X,-5) ) |transpose(X,4) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ) ,-7) ,7) ) ,7) ) |transpose(((transpose((X|arpeggio((X+X) ) ) ,-5) +transpose((X+transpose(((transpose(transpose(X,4) ,4) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,7) ) |(transpose((((X+transpose(X,12) ) +step(X,12) ) +transpose((echo(X,4,6) +transpose(transpose(X,4) ,12) ) ,12) ) ,4) +transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ,7) ) ) ,-5) ) +transpose((shuffle(step((echo((step(shuffle(X) ,12) |transpose(X,4) ) ,4,6) +(arpeggio((step(X,12) +echo(X,4,6) ) ) +transpose((transpose(X,4) +transpose(transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,-5) ,12) ) ,12) ) ) ,12) ) +transpose(arpeggio(((transpose((transpose(transpose(X,-7) ,-7) +(X+transpose(X,12) ) ) ,-7) +transpose((X+transpose((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ,12) ) +(transpose((((X+X) +transpose(X,4) ) +transpose((arpeggio(X) +X) ,7) ) ,-5) |transpose((transpose(X,-5) |transpose(shuffle(step(X,12) ) ,-7) ) ,4) ) ) ) ,7) ) ,12) ) ,-5) ,7) ) ) random seed used was 120394586

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