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 16 generations the expression "X" became this: ((((step(step(((step((echo(X,4,6) +transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,12) +transpose(((step(shuffle((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ) ,12) +transpose(transpose(step(step(arpeggio(X) ,12) ,12) ,4) ,7) ) +transpose((arpeggio(transpose((X|X) ,-5) ) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ,12) ) ,7) ) |(((X+transpose(echo(X,4,6) ,7) ) +(arpeggio(X) +transpose(X,12) ) ) +transpose(((echo((shuffle(transpose(X,-7) ) +(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(shuffle(X) ,12) ) ) ,4,6) +transpose((arpeggio(transpose((X+transpose(X,12) ) ,-7) ) +transpose(transpose(step(X,12) ,-7) ,12) ) ,12) ) |(((echo(X,4,6) +transpose(X,7) ) +transpose((step(X,12) +transpose((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) ) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,12) ) ) ,7) ) ) ,12) ) ) ,12) ,12) +transpose(step(arpeggio(((arpeggio((arpeggio(transpose((arpeggio(X) +transpose(shuffle(transpose(X,-7) ) ,12) ) ,4) ) +transpose(step(shuffle(((echo(X,4,6) +transpose(arpeggio(X) ,7) ) |transpose(echo(X,4,6) ,-7) ) ) ,12) ,7) ) ) +transpose(((transpose(((X+transpose((X|X) ,7) ) |(transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(X,-7) ,12) ) ) ,-5) +transpose(shuffle((((X|X) +transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose(((X+X) |step(X,12) ) ,7) ) ,12) ) |(shuffle(arpeggio((transpose(X,-5) +(((X+transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(X,7) ) ) ) ) +transpose((transpose(transpose(shuffle(transpose(X,-7) ) ,-7) ,-5) |echo((arpeggio((transpose(X,4) +transpose(X,12) ) ) |shuffle((X+transpose(X,7) ) ) ) ,4,6) ) ,12) ) ) ) ,12) ,4) ) +transpose((((((((((step(((shuffle(X) +transpose((X+X) ,7) ) |((echo(X,4,6) +transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,12) +transpose(arpeggio(transpose((step(X,12) +transpose(step(X,12) ,12) ) ,-7) ) ,4) ) +transpose((shuffle(transpose(step(X,12) ,-7) ) +transpose(transpose(arpeggio((X+transpose((X+transpose(X,7) ) ,12) ) ) ,-7) ,7) ) ,7) ) +transpose((echo(transpose(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,-7) ,4,6) +transpose((shuffle(transpose((X+transpose(X,4) ) ,-7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,12) ) ,12) ) ,4) ) +transpose(step(arpeggio((step(((X+transpose(X,7) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,12) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ,4) ) ) ,12) ,7) ) |((shuffle(((transpose(transpose(transpose(X,-7) ,4) ,4) +transpose(((((((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) +step(transpose(X,-7) ,12) ) +transpose(arpeggio(X) ,7) ) +transpose(((X+X) +transpose(X,12) ) ,4) ) +transpose(transpose((echo(X,4,6) +transpose(echo(X,4,6) ,7) ) ,-5) ,7) ) ,4) ) +transpose(echo(transpose(shuffle(X) ,-7) ,4,6) ,7) ) ) +((((echo(X,4,6) +transpose((((X|X) +transpose((X|X) ,7) ) +transpose((transpose(X,-5) +transpose(shuffle(X) ,7) ) ,12) ) ,4) ) +transpose((((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) +transpose((X+transpose(step(arpeggio(X) ,12) ,12) ) ,12) ) ,7) ) +transpose(step(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(step(X,12) ,7) ) ,4) ,12) ,4) ) +transpose(step(transpose(shuffle((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,-7) ,12) ,7) ) ) +transpose((transpose(shuffle(transpose(step(X,12) ,-5) ) ,4) +((step(arpeggio(transpose(step(transpose(X,-7) ,12) ,-5) ) ,12) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) ,12) ) |shuffle((arpeggio(step(X,12) ) |transpose(X,4) ) ) ) ) +transpose(arpeggio((transpose((X|transpose(X,-5) ) ,-7) |shuffle(echo((X+transpose(X,7) ) ,4,6) ) ) ) ,12) ) ) ,12) ) ) +transpose(transpose((transpose(step(((transpose(X,4) +transpose(X,7) ) +transpose(((shuffle(X) +transpose((X+X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,12) ,-7) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +X) +transpose(echo((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,12) ) ,7) ) ,-7) ,4) ) +transpose(echo((transpose((step((((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) |X) ,4) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) ,12) +transpose(transpose(((((transpose(X,-7) +transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,7) ) ,4) ,7) ) ,-7) +(((echo(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,-7) ,4,6) +transpose((transpose(X,4) +transpose(transpose((arpeggio((X+transpose(X,12) ) ) +((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ) ,-7) ,7) ) ,12) ) +transpose(transpose((transpose(transpose(X,-5) ,-7) +transpose((transpose(X,-5) +transpose((echo(X,4,6) +step((X+transpose(X,7) ) ,12) ) ,12) ) ,7) ) ,-7) ,4) ) +transpose(transpose(echo(transpose(transpose(shuffle(arpeggio(X) ) ,4) ,-7) ,4,6) ,-5) ,7) ) ) ,4,6) ,7) ) +transpose(echo(transpose(((step(transpose((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) +transpose((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +echo(X,4,6) ) ,12) ) ,-5) ,12) +transpose((transpose((((shuffle((shuffle(X) |X) ) |(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ) +transpose(step(step(X,12) ,12) ,4) ) +transpose((arpeggio(X) +transpose(transpose((X|X) ,4) ,7) ) ,7) ) ,-7) +transpose(((arpeggio(X) +transpose((step((transpose(X,4) |(shuffle(X) +transpose(X,12) ) ) ,12) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,12) ) ,4) ) +transpose(((transpose(X,-7) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,7) ) ,7) ) ,12) ) +transpose(echo(((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose((shuffle(transpose(X,-7) ) +transpose(X,-5) ) ,7) ) +transpose((((((step(X,12) +transpose(X,7) ) +transpose(transpose(step(X,12) ,-5) ,4) ) +transpose((X+X) ,7) ) +transpose((step((X+transpose(X,7) ) ,12) +transpose((X+transpose(X,12) ) ,4) ) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,4) ,7) ) ,7) ) ,4,6) ,7) ) ,-5) ,4,6) ,12) ) +(echo(transpose(transpose((transpose((X+X) ,-5) +echo(transpose(X,-5) ,4,6) ) ,-7) ,-7) ,4,6) +transpose(((echo(echo(((transpose((((((arpeggio((X+transpose(X,7) ) ) +transpose(shuffle(step(X,12) ) ,4) ) +transpose(X,7) ) +transpose(transpose((X|X) ,-7) ,12) ) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(echo(X,4,6) ,7) ) ,7) ) ,4) ) +transpose(transpose(arpeggio(echo(X,4,6) ) ,-7) ,7) ) ,-7) +transpose(((transpose(shuffle(X) ,-5) +transpose(((X+transpose(X,7) ) +transpose((((X+transpose(X,12) ) +transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,12) ) +transpose(transpose(shuffle(echo(step(X,12) ,4,6) ) ,-5) ,12) ) ,4) ) +transpose(transpose((transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ,-7) ,7) ) ,4,6) ,4,6) +transpose(transpose(echo(transpose(echo((((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose(X,-7) ,12) ) ,4,6) ,-5) ,4,6) ,4) ,7) ) +transpose(transpose(arpeggio(transpose((X+transpose(X,7) ) ,-7) ) ,-7) ,12) ) ,7) ) ) ,7) ) +transpose((step(shuffle(((step(transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) ,-7) ,12) +(transpose(transpose(step(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,12) ,-7) ,4) +transpose((step(transpose(X,-7) ,12) |(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose((echo(X,4,6) +transpose(step(X,12) ,7) ) ,12) ) ) ,7) ) ) |(transpose(echo(echo((step(X,12) |step(X,12) ) ,4,6) ,4,6) ,4) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) ) ) ,12) +transpose(step(transpose((transpose(transpose(transpose(X,-7) ,-7) ,4) |transpose(shuffle(X) ,-7) ) ,4) ,12) ,7) ) ,4) ) +transpose((transpose(transpose(arpeggio(arpeggio((((echo(arpeggio(X) ,4,6) +transpose(transpose(echo(X,4,6) ,-5) ,12) ) +transpose(arpeggio((transpose(arpeggio(X) ,4) +transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ) ,4) ) +transpose((step(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,12) |step(X,12) ) ,7) ) ) ) ,-7) ,-5) |step(shuffle(((shuffle(((arpeggio(X) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ) +transpose(transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,7) ) +transpose(transpose(((X+transpose(arpeggio(X) ,12) ) +transpose(step((X|X) ,12) ,12) ) ,-7) ,7) ) ) ,12) ) ,7) ) random seed used was 171792583

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