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(X,-7) |X) ,4) |arpeggio(transpose(transpose(shuffle(X) ,4) ,-5) ) ) ,-7) +(echo(transpose(step(shuffle(X) ,12) ,-5) ,4,6) |echo(((transpose(transpose(echo(X,4,6) ,-5) ,-7) +transpose((X+transpose(X,7) ) ,7) ) +transpose(step(shuffle((X+transpose(X,12) ) ) ,12) ,12) ) ,4,6) ) ) ,4) |echo((transpose(transpose(step((transpose(transpose(X,-5) ,-5) +transpose(transpose(X,-7) ,12) ) ,12) ,4) ,4) |(((shuffle(((((X+transpose(X,12) ) |(X|X) ) +transpose((X|transpose(X,4) ) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) ) |shuffle(transpose(shuffle(X) ,4) ) ) +transpose((transpose(echo((((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(X,-7) ) ,4,6) ,-5) |arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ,12) ) +((((echo(((transpose(transpose(X,-5) ,4) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((transpose(X,-7) +X) ,7) ) ,4,6) +transpose(X,-5) ) |transpose((shuffle((X+X) ) +transpose((transpose(X,-7) +X) ,7) ) ,-7) ) +transpose(echo(((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) |(X+transpose((((X+transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ) ,4,6) ,4) ) +transpose(transpose(echo(((((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) +echo((X+transpose(X,4) ) ,4,6) ) +transpose(step(((X+X) +transpose(X,7) ) ,12) ,7) ) ,4,6) ,-5) ,7) ) ) ) ,4,6) ) +transpose(transpose((((((((step(transpose(X,-7) ,12) |(transpose(X,-7) |(X|X) ) ) +transpose(((shuffle((X+X) ) +transpose(transpose(X,4) ,7) ) |transpose(X,-7) ) ,12) ) +(transpose(transpose(X,-5) ,-7) +step(arpeggio((X+transpose(X,12) ) ) ,12) ) ) +transpose(shuffle(((shuffle(transpose(X,4) ) +transpose(((X|(X+X) ) +echo(((X+transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ) ,12) ) +((transpose((X+(X+transpose(X,7) ) ) ,4) +transpose(shuffle((step(X,12) +arpeggio(X) ) ) ,7) ) |((X+transpose(transpose(X,-5) ,7) ) +arpeggio((X+transpose(X,12) ) ) ) ) ) ) ,12) ) +transpose(echo(((transpose(echo(X,4,6) ,4) +transpose(step((step(shuffle(X) ,12) +transpose(echo(step(X,12) ,4,6) ,7) ) ,12) ,12) ) +transpose(transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((echo((X+X) ,4,6) |transpose((X+transpose(X,7) ) ,-7) ) ,4) ) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,-7) ,7) ) ,4) ,7) ) ,4,6) ,7) ) +transpose((transpose(transpose(step(transpose(transpose(arpeggio(((X+X) +transpose((X|X) ,12) ) ) ,-5) ,-7) ,12) ,-5) ,-7) +transpose(((((transpose((transpose(transpose(X,4) ,-5) |arpeggio(X) ) ,4) +transpose(transpose(arpeggio(transpose((X|X) ,-5) ) ,-5) ,7) ) +transpose(echo(transpose(arpeggio((X+X) ) ,-5) ,4,6) ,7) ) +transpose(arpeggio(arpeggio((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,7) ) |echo(transpose(transpose(((arpeggio(transpose(X,-7) ) +shuffle(shuffle(X) ) ) |(((X+transpose(X,12) ) +transpose(shuffle((X|X) ) ,4) ) +transpose(X,7) ) ) ,4) ,-5) ,4,6) ) ,12) ) ,4) ) +transpose(transpose(step(((transpose(transpose(((X+X) +transpose(transpose((X|X) ,4) ,12) ) ,-7) ,4) +transpose(echo(((X+transpose(shuffle(X) ,12) ) |transpose(transpose(X,-5) ,-7) ) ,4,6) ,12) ) +transpose(((((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +transpose((X+X) ,12) ) ,7) ) +transpose(transpose((transpose(X,4) |transpose(X,-7) ) ,4) ,4) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) |(step(transpose(X,-5) ,12) +transpose((((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) |((X|X) +transpose(X,7) ) ) ,12) ) ) ,12) ) ,12) ,-7) ,7) ) ,4) ,-5) ) +((transpose(transpose(echo(transpose((shuffle(((step(((((transpose(X,-7) +X) +transpose(transpose((X+X) ,4) ,4) ) +transpose((transpose(X,4) +transpose(echo(X,4,6) ,12) ) ,7) ) |echo(arpeggio(transpose(X,-5) ) ,4,6) ) ,12) |((step(shuffle(X) ,12) +transpose(((arpeggio(X) +(X+transpose(X,7) ) ) +transpose(transpose(shuffle(X) ,-7) ,12) ) ,7) ) |step((((X+X) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,12) ) ) |((transpose(((X+transpose(X,12) ) +transpose(step(X,12) ,7) ) ,-5) +transpose((((X+transpose((X|X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |((X|X) +(X+X) ) ) ,7) ) +(((transpose((X+transpose(X,12) ) ,-7) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,7) ) |(X+X) ) ) ) ) +(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) +step(transpose((X|X) ,4) ,12) ) +transpose(transpose((arpeggio(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) +echo((arpeggio(((transpose(X,-5) +transpose((transpose(X,4) +transpose(step(X,12) ,12) ) ,12) ) |((shuffle(X) +transpose(X,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ) ) |((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(transpose(((X|echo(X,4,6) ) +transpose(echo(X,4,6) ,-5) ) ,4) ,4) ) +transpose((((X|X) |(X|X) ) +transpose(transpose(X,-7) ,-5) ) ,7) ) ) ,4,6) ) ) ,-5) ,4,6) ,4) ,-7) +transpose(transpose(transpose(shuffle((arpeggio((transpose(((transpose((transpose(X,-5) +transpose(X,7) ) ,-5) +transpose((shuffle((echo(X,4,6) +X) ) |transpose((((echo(X,4,6) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +transpose((shuffle(X) +transpose(transpose(X,4) ,7) ) ,12) ) ,4) ) ,4) ) +transpose(echo((echo((X+transpose((X+transpose(X,7) ) ,12) ) ,4,6) |((X|X) +transpose(X,12) ) ) ,4,6) ,7) ) ,4) +transpose((step(X,12) +(((arpeggio(X) |(((X+transpose(X,7) ) |arpeggio(X) ) +transpose(((((X+X) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) |shuffle(X) ) ,7) ) ) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(transpose(step((transpose(X,4) +transpose((X|X) ,7) ) ,12) ,-7) ,7) ) ) ,7) ) ) +shuffle(arpeggio(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) +transpose((transpose(X,4) +transpose(echo(X,4,6) ,12) ) ,12) ) ,4,6) ) ) ) ) ,4) ,4) ,4) ) +transpose((transpose(transpose(echo((step(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) +transpose((transpose(X,4) +(transpose((X+transpose(X,7) ) ,-7) |X) ) ,12) ) ,12) |transpose(transpose((((X+transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose((X+X) ,7) ) |(((X+transpose(X,12) ) +transpose(step(X,12) ,7) ) +transpose(X,4) ) ) ,-7) ,-5) ) ,4,6) ,-5) ,4) +transpose((transpose(transpose((echo(((transpose(X,-5) +transpose(step(transpose((X+X) ,4) ,12) ,4) ) +transpose((arpeggio((X+transpose(X,12) ) ) +transpose(step((transpose(X,4) |(X+transpose(X,7) ) ) ,12) ,7) ) ,7) ) ,4,6) |arpeggio(((((((X+transpose(X,12) ) |X) +transpose(((transpose(X,-5) +((X|transpose(X,-5) ) |transpose(step(X,12) ,-5) ) ) |((X+X) +transpose(transpose(transpose(X,4) ,4) ,7) ) ) ,12) ) |transpose(((X+transpose(X,12) ) |transpose(X,-7) ) ,-5) ) +transpose(transpose(transpose(transpose(arpeggio(transpose(X,-7) ) ,4) ,-7) ,-7) ,4) ) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose((echo(X,4,6) +arpeggio(X) ) ,7) ) +transpose((transpose(X,4) +arpeggio(X) ) ,-5) ) +((transpose(transpose(X,4) ,-7) +transpose(step(echo(X,4,6) ,12) ,4) ) +transpose((transpose(transpose(X,-5) ,4) +X) ,7) ) ) ,7) ) ) ) ,4) ,-5) +(shuffle((transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(X,12) ) ,4) ,-7) +transpose((transpose(arpeggio(transpose(shuffle((X+X) ) ,-5) ) ,4) |((transpose(((X+X) +X) ,-7) +shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) +transpose(arpeggio((transpose(transpose(X,-7) ,4) +transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) ) ,12) ) ) ,-7) ) ) +transpose(step(transpose(arpeggio(transpose(shuffle((step(transpose(X,-7) ,12) +transpose(shuffle((X+transpose(X,7) ) ) ,12) ) ) ,4) ) ,-7) ,12) ,7) ) ) ,7) ) ,7) ) ) ,-5) random seed used was 238504668

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