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 13 generations the expression "X" became this: ((arpeggio(((((((step(step((shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) +transpose((transpose(X,-5) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,12) ) ,12) ,12) +transpose((((shuffle((X+transpose(X,12) ) ) +transpose(((arpeggio(X) |(X+transpose(X,12) ) ) |shuffle(X) ) ,4) ) +transpose((arpeggio(X) +transpose(shuffle(transpose(X,-7) ) ,12) ) ,7) ) +transpose(transpose((echo(X,4,6) +(X+transpose(X,12) ) ) ,-5) ,12) ) ,4) ) +transpose((shuffle(shuffle(X) ) +transpose(transpose(shuffle(echo((X|X) ,4,6) ) ,-7) ,12) ) ,7) ) +transpose((((transpose(transpose(X,4) ,-7) +transpose(X,-5) ) +transpose(transpose(shuffle(arpeggio(((X+transpose(X,12) ) +transpose(X,12) ) ) ) ,-7) ,4) ) +transpose((arpeggio(step(((X|X) +X) ,12) ) +transpose(arpeggio(step(arpeggio(X) ,12) ) ,12) ) ,7) ) ,4) ) +transpose((((arpeggio(arpeggio(((X+transpose(X,12) ) +transpose(X,12) ) ) ) +transpose(transpose(arpeggio(arpeggio(X) ) ,-7) ,4) ) +transpose(shuffle((arpeggio(X) +transpose((step(X,12) +transpose(X,12) ) ,7) ) ) ,7) ) +step((shuffle(X) +(echo(X,4,6) +X) ) ,12) ) ,7) ) +transpose(((arpeggio(step(arpeggio(echo(X,4,6) ) ,12) ) +transpose((((X|X) +transpose(transpose(step(X,12) ,-5) ,12) ) +transpose((echo(shuffle(X) ,4,6) +transpose(arpeggio(arpeggio(X) ) ,12) ) ,7) ) ,4) ) +transpose(transpose(step((X+X) ,12) ,-5) ,7) ) ,7) ) +transpose(echo(((echo(arpeggio(X) ,4,6) +transpose(((transpose(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ,-5) +transpose(step(arpeggio(transpose(X,-7) ) ,12) ,12) ) +transpose(echo(shuffle(arpeggio(arpeggio((X+transpose(X,7) ) ) ) ) ,4,6) ,12) ) ,12) ) +(arpeggio(((((X+transpose(transpose(X,4) ,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) +transpose((((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,12) ) ) +transpose((echo((X+transpose(X,12) ) ,4,6) +transpose(arpeggio((X+transpose(echo(arpeggio(X) ,4,6) ,7) ) ) ,12) ) ,12) ) ) ,4,6) ,7) ) ) +transpose(((echo(((((transpose(X,-5) +transpose(arpeggio(arpeggio(X) ) ,4) ) +transpose((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) +transpose(((((transpose(X,4) +transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(((shuffle((X+transpose((X+X) ,12) ) ) +(((transpose(X,-5) +transpose(echo(X,4,6) ,7) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ) +transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) |(transpose(X,-5) +transpose((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ) ,12) ) ,7) ) ,4) ) +transpose((((((X+X) +transpose(transpose(X,-7) ,4) ) +transpose(((X+X) +transpose(arpeggio(X) ,12) ) ,7) ) |(echo((step(X,12) +transpose(transpose(X,4) ,7) ) ,4,6) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) +transpose(step((arpeggio(X) +transpose(shuffle(shuffle(X) ) ,7) ) ,12) ,7) ) ,7) ) ,4,6) +transpose((shuffle((step(X,12) +transpose(transpose(X,-5) ,7) ) ) +transpose((echo(X,4,6) |shuffle(X) ) ,7) ) ,-7) ) +transpose((((shuffle(((transpose((echo((X|X) ,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ,-7) +transpose((transpose(arpeggio(arpeggio(X) ) ,4) +transpose(((transpose(transpose(X,-7) ,4) +transpose(X,12) ) +transpose(((transpose(X,-5) +transpose((X|X) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,4) ) +transpose(transpose(echo((X+transpose(echo(X,4,6) ,12) ) ,4,6) ,-5) ,7) ) ) +transpose((arpeggio((shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) +arpeggio(transpose(X,-7) ) ) ) +transpose(X,-7) ) ) |((((((((step(X,12) +transpose(transpose(X,-5) ,12) ) |(arpeggio(X) +arpeggio(X) ) ) +echo(shuffle(X) ,4,6) ) +transpose(((((X+transpose(X,12) ) +transpose(arpeggio(X) ,12) ) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose(X,7) ) ,4) ) +transpose(((X|echo(X,4,6) ) +transpose((X+transpose(shuffle(X) ,7) ) ,12) ) ,7) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) +transpose(transpose((transpose(X,-7) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,4) ,4) ) +transpose((transpose(X,-7) +transpose(((shuffle((X+transpose(X,12) ) ) +transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,4) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ,12) ) ,7) ) ) ,4) ) +transpose(echo(((((shuffle(arpeggio((X|X) ) ) +transpose(transpose(((X+X) +transpose(transpose(transpose(X,4) ,-7) ,12) ) ,4) ,4) ) +transpose(((shuffle(X) +(X+transpose(X,12) ) ) +transpose(arpeggio(X) ,4) ) ,7) ) +transpose(transpose(echo(shuffle(shuffle(X) ) ,4,6) ,-5) ,4) ) +transpose(transpose(transpose(shuffle((((X+transpose(X,12) ) +transpose((X|X) ,12) ) |((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ) ) ,-7) ,4) ,7) ) ,4,6) ,7) ) +transpose((((arpeggio(((transpose((transpose(X,4) +transpose(step(X,12) ,12) ) ,-5) |(transpose(transpose(X,-7) ,-5) +transpose(shuffle(shuffle(X) ) ,7) ) ) +transpose((((arpeggio((X+transpose(X,7) ) ) +transpose((step(X,12) +transpose(X,7) ) ,7) ) +transpose(shuffle(((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,4) ) +transpose((X+transpose((X+X) ,7) ) ,7) ) ,7) ) ) +transpose((step((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ) +transpose((arpeggio((X+transpose(X,12) ) ) +transpose(X,7) ) ,12) ) ,12) |((X+transpose((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) |echo((transpose(X,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ) ) ,12) ) +transpose(((transpose(((arpeggio(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ) |(transpose((X+transpose(X,12) ) ,4) +step(X,12) ) ) +transpose(echo((echo(echo(X,4,6) ,4,6) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ,4,6) ,12) ) ,4) +transpose(((step((X|((step(X,12) +transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose(X,-5) ,12) ) ) ,12) +transpose(transpose(shuffle(echo(transpose(X,-5) ,4,6) ) ,-7) ,4) ) +transpose(echo(arpeggio((X+X) ) ,4,6) ,7) ) ,4) ) +transpose((step(transpose(step(X,12) ,-7) ,12) +transpose((((shuffle(X) +transpose(((X+transpose(X,7) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(step(X,12) ,7) ) ,12) ) ,7) ) ,4) ) +transpose(((((arpeggio((transpose(echo((X+transpose(X,12) ) ,4,6) ,4) +transpose(transpose(X,4) ,-7) ) ) +transpose(arpeggio(transpose((shuffle(X) |X) ,-5) ) ,4) ) +transpose(((transpose(transpose(X,-7) ,4) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose(transpose(transpose(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ,-5) ,12) ) ,7) ) +step((arpeggio(echo(X,4,6) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ,12) ) +transpose(step(echo((arpeggio(X) +transpose(X,7) ) ,4,6) ,12) ,12) ) ,7) ) ,12) ) ,12) ) ,4) ) +transpose((arpeggio(shuffle(arpeggio(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,12) ) +transpose(shuffle(X) ,12) ) ,7) ) +transpose(((X|X) |(transpose(X,-5) +transpose(step(X,12) ,7) ) ) ,12) ) ,-5) ) ) ) +transpose(shuffle(shuffle(transpose(transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ,-5) ,-7) ) ) ,12) ) ,7) ) random seed used was 64094567

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