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(((echo(echo((step((transpose((arpeggio(transpose(step((arpeggio(((X+transpose(X,12) ) |(X|X) ) ) +((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ) ,12) ,-5) ) +(transpose((shuffle((transpose(X,4) +transpose(transpose(X,-5) ,-7) ) ) +transpose(shuffle(transpose(arpeggio(X) ,-5) ) ,7) ) ,4) +((transpose((transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,-7) +transpose(X,-5) ) ,-5) +transpose(arpeggio((transpose(X,-7) |((((X+X) +X) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose((transpose((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) |shuffle(X) ) ,-5) +transpose(arpeggio((transpose((X+X) ,-7) |step(X,12) ) ) ,12) ) ,7) ) ) ) ,-7) +transpose(arpeggio(transpose(((((((transpose(transpose((((shuffle(X) +transpose(X,4) ) +transpose((X|X) ,7) ) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ,-7) ,-5) +transpose(transpose(transpose(step(X,12) ,-5) ,-7) ,4) ) +transpose(transpose(step(transpose(X,4) ,12) ,-7) ,7) ) |((transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) +((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose((((X+transpose((X|transpose(X,4) ) ,4) ) +transpose(transpose(X,4) ,7) ) |transpose(echo(X,4,6) ,-7) ) ,7) ) ) +transpose(((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4) |(transpose(transpose((echo(X,4,6) |step(X,12) ) ,4) ,-7) |transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) +transpose(transpose((arpeggio(X) +transpose((X|transpose(X,-7) ) ,12) ) ,-5) ,12) ) ,7) ) |transpose(arpeggio(step(step(transpose(X,-7) ,12) ,12) ) ,-7) ) +((echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) +transpose(arpeggio(echo(X,4,6) ) ,7) ) |transpose(echo(transpose(step((X|X) ,12) ,-7) ,4,6) ,4) ) ) ,4) ) ,12) ) ,12) +transpose((echo(transpose(transpose(transpose(((step(transpose(X,4) ,12) +(arpeggio(X) +transpose(((X|X) +transpose(X,12) ) ,12) ) ) +transpose(echo((transpose((X+transpose(X,7) ) ,-7) |((X+transpose(X,7) ) +X) ) ,4,6) ,12) ) ,-5) ,-7) ,-7) ,4,6) |(((((((((transpose(arpeggio(shuffle(X) ) ,-7) +transpose((transpose((X+X) ,-7) +transpose(shuffle(((X+transpose(X,12) ) +(X|X) ) ) ,12) ) ,4) ) +transpose(arpeggio(transpose((X+transpose(X,7) ) ,-7) ) ,7) ) +transpose((arpeggio(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ) +transpose(transpose((transpose(shuffle(X) ,-7) +(X|(X+transpose(X,7) ) ) ) ,4) ,7) ) ,4) ) +transpose((((echo(X,4,6) |(X|X) ) +(echo(X,4,6) |(transpose(X,4) +transpose(transpose(X,-7) ,12) ) ) ) +step(transpose(X,-5) ,12) ) ,7) ) +transpose(transpose(((X+X) +transpose(transpose(((X|X) |X) ,-5) ,7) ) ,-5) ,4) ) +transpose((echo(((shuffle(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) |step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) +transpose((shuffle(X) +echo(X,4,6) ) ,4) ) +transpose((transpose(transpose(X,4) ,-5) +arpeggio(X) ) ,7) ) ,4,6) +transpose(echo(transpose((transpose(X,4) |transpose(X,4) ) ,-5) ,4,6) ,12) ) ,7) ) +transpose(((transpose(transpose((transpose(echo(X,4,6) ,-7) |arpeggio(X) ) ,-5) ,-5) +transpose(((transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose((X+X) ,7) ) +((X+X) |transpose(transpose(X,-5) ,-5) ) ) ,-5) +transpose((transpose(arpeggio(echo(X,4,6) ) ,-5) +X) ,4) ) +transpose((shuffle((transpose(X,-7) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) ,12) ) ) +transpose(shuffle(transpose((X+transpose(X,7) ) ,-5) ) ,-7) ) ,7) ) ,4) ) +transpose(shuffle(shuffle(transpose(X,4) ) ) ,7) ) ,4) ) +transpose((((transpose(step(echo(X,4,6) ,12) ,-7) |step(shuffle((transpose(X,-7) +transpose(X,12) ) ) ,12) ) +transpose(step(transpose(transpose(echo(X,4,6) ,-7) ,4) ,12) ,-5) ) +transpose(((transpose(transpose(step(X,12) ,-5) ,-5) +transpose(shuffle(transpose((((arpeggio(X) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((X|transpose(X,4) ) ,7) ) ,4) ) ,4) ) +transpose((((X+X) +transpose(transpose(X,-7) ,12) ) +echo(transpose(X,-7) ,4,6) ) ,7) ) ,12) ) ,7) ) +arpeggio(echo(transpose((X|X) ,-7) ,4,6) ) ) ) ,7) ) ,4,6) ,4,6) +transpose(transpose(transpose(transpose(((transpose(((shuffle((X+transpose(X,-5) ) ) +arpeggio(transpose(transpose(((X+transpose(X,4) ) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,7) ) ,4) ,-5) ) ) +transpose(step(((shuffle(((X+transpose(X,12) ) +(X|X) ) ) +transpose((((X|X) +transpose((X+X) ,7) ) |step(transpose(X,-5) ,12) ) ,12) ) +transpose(transpose((X|X) ,4) ,7) ) ,12) ,-7) ) ,-7) |(shuffle((((transpose(X,-5) |X) |(transpose(X,-7) +transpose(X,7) ) ) +transpose(transpose(transpose(transpose(X,-5) ,4) ,-7) ,7) ) ) |(step(shuffle(((X+X) +transpose(X,12) ) ) ,12) +transpose(echo(echo(transpose(transpose((transpose(shuffle(transpose(X,-5) ) ,-5) +transpose(((X+X) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) ,-5) ,4,6) ,4,6) ,7) ) ) ) +transpose(transpose(transpose((((echo(arpeggio(transpose(X,-7) ) ,4,6) |(transpose(transpose(X,-7) ,-5) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ) +arpeggio((transpose(X,4) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,7) ) ) ) +transpose(transpose(echo(echo((X+X) ,4,6) ,4,6) ,-7) ,7) ) ,4) ,4) ,7) ) ,4) ,4) ,-7) ,4) ) +transpose(echo(((echo((step(step(shuffle(transpose(shuffle(X) ,4) ) ,12) ,12) |(transpose((transpose(((transpose(X,4) +transpose((X+X) ,7) ) +transpose((X+X) ,7) ) ,4) +(((transpose(X,-5) +transpose((X+X) ,12) ) |arpeggio(X) ) +transpose((transpose(X,4) +((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,7) ) ) ,-7) +transpose(transpose((transpose(X,-5) |shuffle(transpose((X+transpose(X,7) ) ,-7) ) ) ,4) ,7) ) ) ,4,6) |(((transpose(transpose(transpose(X,-7) ,4) ,-7) +((arpeggio(transpose(arpeggio(X) ,4) ) +transpose(transpose((transpose(X,-5) +transpose((echo(shuffle((transpose(X,-5) +(X|X) ) ) ,4,6) +transpose(step((transpose(X,-5) +transpose(((X|X) +X) ,7) ) ,12) ,7) ) ,7) ) ,-5) ,4) ) +transpose((echo((shuffle(X) +transpose(arpeggio(arpeggio(X) ) ,12) ) ,4,6) +((transpose((X+transpose(X,12) ) ,-7) |(X|transpose(X,-5) ) ) |(X|X) ) ) ,7) ) ) |step((((step((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) +arpeggio(echo(transpose(X,-5) ,4,6) ) ) +transpose((((transpose(X,-7) +transpose(arpeggio(((X+transpose(X,7) ) +X) ) ,4) ) +transpose((X|(X+X) ) ,7) ) |((X+X) |((echo(X,4,6) +transpose(transpose(X,-5) ,12) ) +transpose(X,12) ) ) ) ,4) ) +transpose((((transpose((X+transpose(X,12) ) ,4) +transpose(((transpose(X,-7) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose(transpose((X+transpose(shuffle(X) ,12) ) ,-7) ,4) ) +transpose((((((X+X) |X) +transpose(((X+transpose(X,12) ) +transpose((X+X) ,12) ) ,4) ) +transpose((X|X) ,7) ) +transpose((step(X,12) +transpose((X|shuffle(X) ) ,7) ) ,12) ) ,7) ) ,7) ) ,12) ) |((((arpeggio((transpose((X+X) ,-7) +arpeggio((X|X) ) ) ) +arpeggio((echo(arpeggio(shuffle(X) ) ,4,6) +transpose(transpose(X,-7) ,12) ) ) ) +transpose(arpeggio(shuffle(transpose((transpose((X+X) ,-7) |step(X,12) ) ,-7) ) ) ,12) ) |(arpeggio((transpose(transpose(transpose(X,-5) ,4) ,-5) +step(transpose(arpeggio(shuffle((X+X) ) ) ,4) ,12) ) ) +transpose(((shuffle(transpose(X,4) ) |transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,4) ) +step(X,12) ) ,-7) ) +transpose((arpeggio(((X+transpose(((X|X) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) +transpose(transpose(X,-7) ,-5) ) ,12) ) ,4) ) ) +transpose((transpose((step((transpose(X,4) +transpose(transpose((transpose(X,-5) +(X+X) ) ,-7) ,12) ) ,12) +transpose((step(transpose((X+transpose(X,12) ) ,-5) ,12) +transpose(step(transpose((transpose(transpose(X,4) ,-7) |(X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) ,12) ,12) ) ,12) ) ,-5) |(arpeggio(transpose(arpeggio(X) ,-7) ) +step((shuffle(transpose(transpose(X,-7) ,-7) ) +transpose(arpeggio(X) ,12) ) ,12) ) ) ,12) ) ) ) +transpose((((((((echo((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) +transpose((X+transpose(X,-5) ) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) |(arpeggio((X+X) ) |transpose(X,4) ) ) +transpose((transpose((shuffle(X) |X) ,-5) +transpose((transpose(X,-5) +echo(X,4,6) ) ,-5) ) ,-5) ) +transpose(echo(transpose(((((transpose(X,-7) +(transpose(X,-7) +transpose(echo(X,4,6) ,7) ) ) +transpose(((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |(X+transpose(X,7) ) ) ,4) ) +transpose((transpose(X,4) +shuffle(X) ) ,7) ) +transpose(((((arpeggio(transpose(X,-7) ) +transpose(((X|X) |transpose(X,-5) ) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(((step(X,12) +transpose(step(X,12) ,7) ) |transpose(echo(X,4,6) ,4) ) ,-5) ,7) ) ,4) ) ,4) ,4,6) ,12) ) +arpeggio((step((arpeggio(((arpeggio(transpose(X,-5) ) +transpose(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) +transpose((X+arpeggio(echo(X,4,6) ) ) ,-7) ) ,12) |(transpose(((step(shuffle(X) ,12) +transpose(transpose(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ,4) ,4) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(shuffle(X) ,12) ) |step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,-5) |echo(arpeggio(transpose(X,-7) ) ,4,6) ) ) ) ) |transpose((transpose(step((transpose(step((X+transpose(X,12) ) ,12) ,4) |((shuffle(X) +transpose((transpose(X,4) +X) ,4) ) +transpose((X|X) ,7) ) ) ,12) ,4) +arpeggio(transpose((step(arpeggio((arpeggio(step(transpose(X,-7) ,12) ) |((arpeggio(X) +(X|X) ) +transpose(step(transpose(X,-5) ,12) ,12) ) ) ) ,12) +(shuffle((transpose(X,4) |(transpose(X,-7) |X) ) ) +transpose((transpose(((X+transpose(X,7) ) +(((X+X) |shuffle(X) ) |(X+echo(X,4,6) ) ) ) ,4) +transpose(echo(step((X|(X|X) ) ,12) ,4,6) ,12) ) ,7) ) ) ,4) ) ) ,-7) ) ,12) ) ,4,6) ,7) ) ,-5) random seed used was 235327826

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