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: arpeggio(arpeggio((((echo((((transpose(X,4) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,-7) ) +transpose(transpose(transpose(transpose(X,-5) ,4) ,4) ,7) ) |transpose((((shuffle(X) +echo(X,4,6) ) |shuffle((X+X) ) ) +echo((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |X) ) +(X+transpose(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ,7) ) ) ,4,6) ) ,-7) ) ,4,6) +transpose(shuffle(((((step(transpose(((X+shuffle(shuffle((X+transpose(X,7) ) ) ) ) +transpose(X,4) ) ,-5) ,12) +transpose((transpose((((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) |(X|X) ) ,-7) +(((echo(X,4,6) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose((transpose(X,4) +transpose(X,7) ) ,7) ) +arpeggio((step(X,12) +transpose(arpeggio(X) ,7) ) ) ) ) ,4) ) +transpose((((transpose((transpose(X,-7) +(X+transpose(X,7) ) ) ,-5) +transpose(shuffle(arpeggio((X+transpose(X,12) ) ) ) ,7) ) +transpose((shuffle((X+transpose(X,7) ) ) +transpose((X+transpose(arpeggio(X) ,12) ) ,7) ) ,12) ) +transpose(transpose(((transpose(((transpose(X,4) +transpose(arpeggio((X|X) ) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,-5) +transpose((arpeggio(X) |(X+arpeggio(X) ) ) ,4) ) +transpose((transpose((arpeggio(X) +transpose(echo(X,4,6) ,12) ) ,-5) |echo(arpeggio(step(X,12) ) ,4,6) ) ,7) ) ,-7) ,7) ) ,7) ) +transpose(echo((echo((X+transpose(X,7) ) ,4,6) +shuffle(shuffle(echo(X,4,6) ) ) ) ,4,6) ,12) ) +(((transpose((((X+X) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) +transpose(step(arpeggio(X) ,12) ,4) ) +transpose((echo(transpose(transpose(X,-5) ,-7) ,4,6) |transpose(((transpose(X,-7) +transpose(step(X,12) ,7) ) +transpose(X,12) ) ,4) ) ,7) ) +((arpeggio(echo(echo(X,4,6) ,4,6) ) +transpose(((step(X,12) +transpose(X,-7) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,4) ) +transpose(shuffle(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ) ,7) ) ) ) ) ,7) ) +transpose(transpose(transpose(((shuffle(arpeggio(X) ) +transpose((((transpose(X,-5) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |step(X,12) ) ,4) ) +transpose(((((X+X) |X) +((((X+transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose((step(transpose(X,-5) ,12) +X) ,7) ) ) +(((echo(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4,6) +transpose(step((X+transpose(transpose(X,4) ,12) ) ,12) ,7) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose(((echo(X,4,6) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,4) ) +transpose((arpeggio(shuffle(X) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ,7) ) ,4) ,4) ,7) ) +transpose((arpeggio((echo(echo(X,4,6) ,4,6) +transpose((transpose(transpose(X,4) ,-5) +transpose((shuffle(X) |X) ,7) ) ,12) ) ) +transpose(((((echo((shuffle(arpeggio(shuffle(X) ) ) +transpose(arpeggio(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(echo(echo(X,4,6) ,4,6) ,4) ) +transpose(shuffle(shuffle((X+X) ) ) ,7) ) ) ,12) ) ,4,6) |transpose(shuffle(echo(transpose(((shuffle(step(X,12) ) +transpose(transpose(X,4) ,12) ) |shuffle(arpeggio(echo(X,4,6) ) ) ) ,4) ,4,6) ) ,4) ) +transpose(((((shuffle(X) +transpose(((((X+transpose(((X+transpose(X,7) ) |X) ,4) ) +transpose(shuffle(X) ,7) ) +transpose((shuffle(step(X,12) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) ,4) ) +transpose(((X+transpose(step((X+transpose(X,12) ) ,12) ,7) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,7) ) +transpose(transpose(step((arpeggio(X) +transpose((X+X) ,7) ) ,12) ,-7) ,4) ) +transpose(shuffle((((arpeggio(X) +transpose(arpeggio(X) ,7) ) +transpose(step(((X|X) |step(X,12) ) ,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ,4) ) +transpose(echo(echo(step((transpose((X+transpose(X,7) ) ,-7) |shuffle(((X+X) +X) ) ) ,12) ,4,6) ,4,6) ,4) ) +transpose(echo(transpose((step(((X+X) |(X|X) ) ,12) +transpose(echo(X,4,6) ,12) ) ,-7) ,4,6) ,7) ) ,12) ) ,12) ) ) ) random seed used was 64 EXPR = transpose(transpose(((transpose(transpose((transpose(transpose(transpose(X,-7) ,-5) ,4) +transpose((((transpose((shuffle(X) +transpose(X,12) ) ,-7) +transpose(((echo(X,4,6) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose(shuffle(shuffle(X) ) ,7) ) +transpose(((transpose((X+transpose(echo(X,4,6) ,7) ) ,-5) +transpose(transpose((X|X) ,-5) ,4) ) +transpose((X|((X+transpose(X,7) ) +transpose(X,7) ) ) ,7) ) ,7) ) ,7) ) ,-7) ,-7) |(arpeggio(arpeggio(((shuffle(shuffle(X) ) +transpose((X+X) ,4) ) +transpose(step(transpose((X|X) ,-5) ,12) ,7) ) ) ) +transpose((((step(transpose(step(X,12) ,-7) ,12) +transpose(echo(step((step(echo(X,4,6) ,12) |(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ,12) ,4,6) ,4) ) +transpose(transpose(echo((arpeggio(X) |step(X,12) ) ,4,6) ,4) ,7) ) |transpose(echo(echo((echo(X,4,6) +transpose((X|X) ,7) ) ,4,6) ,4,6) ,-7) ) ,12) ) ) +transpose(transpose((transpose((echo(arpeggio((transpose(X,4) +transpose(X,7) ) ) ,4,6) |((X+transpose(echo(X,4,6) ,7) ) +arpeggio(X) ) ) ,-7) +transpose(arpeggio(echo(transpose(echo(arpeggio((((X+transpose(transpose(X,-5) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) |transpose(step(transpose(X,-5) ,12) ,4) ) ) ,4,6) ,-5) ,4,6) ) ,7) ) ,4) ,7) ) ,4) ,4) random seed used was 0 EXPR = (echo(transpose(transpose(((transpose(step(echo(step(X,12) ,4,6) ,12) ,-7) +transpose((transpose(echo(X,4,6) ,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) +arpeggio(echo(transpose(transpose(step(X,12) ,-5) ,4) ,4,6) ) ) ,-5) ,-5) ,4,6) +step(transpose(((arpeggio(transpose((transpose(((step(transpose(X,4) ,12) +transpose((transpose(echo(step(X,12) ,4,6) ,4) +transpose(step((X+transpose((X+transpose(X,7) ) ,7) ) ,12) ,12) ) ,4) ) +transpose(transpose(transpose((arpeggio(X) +X) ,-5) ,4) ,7) ) ,4) +transpose((transpose(step(transpose(X,-7) ,12) ,-5) +transpose((((transpose(X,-7) +transpose(X,7) ) +transpose((X+transpose(X,-5) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,7) ) ,-5) ) +transpose(arpeggio((shuffle(((step(((echo(X,4,6) +transpose(arpeggio(X) ,7) ) +transpose((transpose(transpose(transpose(X,-7) ,4) ,-7) +transpose(transpose(arpeggio(X) ,-7) ,-5) ) ,7) ) ,12) +transpose(shuffle((((step(X,12) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +shuffle(X) ) ) ,7) ) +transpose(step(((((echo(X,4,6) +transpose(X,7) ) +transpose(shuffle(X) ,12) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,7) ) ,12) ,7) ) ) +transpose(transpose(shuffle(shuffle(((X+transpose(X,7) ) +transpose(((X+transpose(X,7) ) +echo(X,4,6) ) ,7) ) ) ) ,4) ,7) ) ) ,4) ) +transpose(transpose((((transpose(shuffle((transpose(transpose((X+transpose(X,7) ) ,4) ,-5) +transpose((echo(arpeggio((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ) ,4,6) |arpeggio(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) ,7) ) ) ,4) +transpose((echo(echo((((((transpose(X,-7) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) +transpose(((X+transpose((X+transpose(X,7) ) ,7) ) +X) ,7) ) |step(X,12) ) ,4,6) ,4,6) |(((X+transpose(X,12) ) +transpose(step((transpose(X,-7) |X) ,12) ,7) ) +transpose(((shuffle(X) +transpose(X,4) ) +transpose((transpose(X,-7) +transpose(arpeggio(X) ,7) ) ,7) ) ,7) ) ) ,4) ) +transpose(transpose(((step(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +echo((X+transpose(X,12) ) ,4,6) ) +transpose(transpose((X+transpose(step(arpeggio(X) ,12) ,12) ) ,4) ,12) ) ,12) +transpose(arpeggio((step((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) |(X+X) ) ) ,4) ) +transpose(transpose(((((X|X) +transpose(X,4) ) +transpose(X,7) ) +X) ,4) ,7) ) ,4) ,7) ) |(arpeggio(transpose((step((X+transpose(X,7) ) ,12) +transpose(((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) +step((X|X) ,12) ) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ,7) ) ,4) ) |(arpeggio(shuffle(transpose(((((transpose(X,-5) +transpose(X,12) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((X|shuffle(X) ) ,7) ) ,-7) ) ) |step(step(shuffle(X) ,12) ,12) ) ) ) ,4) ,7) ) ,4) ,12) ) random seed used was 0 EXPR = (step(arpeggio(transpose(shuffle(((transpose(((((transpose(X,4) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) +transpose(echo(shuffle(transpose((echo(X,4,6) |(X+transpose((X+transpose(X,7) ) ,12) ) ) ,-7) ) ,4,6) ,4) ) +transpose(transpose(transpose((arpeggio(shuffle(X) ) |((X+transpose(X,7) ) +transpose(X,7) ) ) ,-7) ,-5) ,7) ) ,4) +transpose(arpeggio(step(transpose(step(shuffle(X) ,12) ,-5) ,12) ) ,4) ) +transpose(((shuffle(step(transpose(X,-7) ,12) ) +transpose(transpose(step(echo(X,4,6) ,12) ,-7) ,7) ) +transpose((shuffle((transpose(transpose((X+transpose(X,7) ) ,4) ,-5) |transpose((((X+X) +transpose(echo(X,4,6) ,4) ) +transpose(((X+X) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4) ) ) +transpose(step(transpose((((transpose(X,-5) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) |((X+transpose(X,7) ) |(X+transpose(X,7) ) ) ) ,4) ,12) ,7) ) ,7) ) ,7) ) ) ,-7) ) ,12) +((echo(transpose(((echo((((X+transpose(X,12) ) +transpose(arpeggio(X) ,7) ) |(((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(shuffle((X|X) ) ,7) ) ) ,4,6) +transpose((arpeggio(((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ) +transpose((step((X+transpose(shuffle(X) ,12) ) ,12) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4) ) +transpose(step((arpeggio(X) +transpose((((arpeggio(echo(X,4,6) ) +transpose(X,-7) ) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,12) ,7) ) ,-5) ,4,6) +transpose(echo((transpose(transpose(transpose(arpeggio(((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) ,-5) ,-7) +transpose((((transpose(((((transpose(X,-7) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(X,7) ) |shuffle(transpose(step(X,12) ,4) ) ) +transpose((step((arpeggio((X+transpose(X,7) ) ) +transpose(step(X,12) ,7) ) ,12) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,7) ) ,4) +transpose(((((X+transpose(step(X,12) ,7) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) +arpeggio(echo((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,4,6) ) ) +transpose(transpose(shuffle(step(X,12) ) ,-5) ,12) ) ,4) ) +transpose(transpose((step(X,12) |(arpeggio(X) |step(X,12) ) ) ,-5) ,7) ) +(transpose(shuffle(echo(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,-5) ,4,6) ) ,-5) +arpeggio(((echo(((((shuffle(X) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(((X+X) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4,6) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) +transpose(((arpeggio((X+transpose(X,7) ) ) +transpose((transpose(((shuffle(X) +transpose(arpeggio(X) ,4) ) +transpose((X+X) ,7) ) ,-7) |(X+shuffle(X) ) ) ,4) ) +transpose(shuffle((X|((X+X) +transpose(X,-7) ) ) ) ,7) ) ,7) ) ) ) ) ,7) ) ,4,6) ,4) ) +transpose((((((echo(shuffle(arpeggio(X) ) ,4,6) +transpose(transpose(((transpose(transpose(X,-5) ,-7) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,4) ) +transpose(transpose(arpeggio(((transpose(X,4) +transpose(X,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ) ,-7) ,7) ) |arpeggio((transpose(transpose((((X+X) |X) |step(X,12) ) ,-5) ,-7) +transpose(((echo(((X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,4,6) |step(step(transpose(X,-5) ,12) ,12) ) +((((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) +transpose(arpeggio((X+transpose((X+transpose(X,12) ) ,12) ) ) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) ) ,7) ) ) ) +transpose((step((((step(arpeggio(X) ,12) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) +transpose((X+shuffle(X) ) ,7) ) ,12) +transpose(transpose(X,-5) ,4) ) ,4) ) +transpose(arpeggio((transpose(((transpose((X|arpeggio(X) ) ,-7) +transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(echo((((step(X,12) |(step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((X|echo(step(X,12) ,4,6) ) ,4) ) +transpose(X,7) ) ,4,6) ,4) ) ) ,7) ) ,7) ) ) random seed used was 0 NOTE: Generated phrase was too large ( 5520 ) , it has been truncated at 5000 notes.

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