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 15 generations the expression "X" became this: echo(arpeggio((arpeggio(echo(step(step(step(transpose((X+transpose(X,7) ) ,-5) ,12) ,12) ,12) ,4,6) ) +step(echo((echo(echo(shuffle(((transpose(X,4) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ) ,4,6) ,4,6) +arpeggio(((echo(X,4,6) +transpose(shuffle(X) ,7) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ) ) ,4,6) ,12) ) ) ,4,6) random seed used was 11 NOTE: Generated phrase was too large ( 6300 ) , it has been truncated at 5000 notes. EXPR = echo(((((shuffle(transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,4) ) +transpose(transpose(arpeggio((((transpose(shuffle(((shuffle(X) +transpose(X,12) ) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,12) ) ) ,-7) +transpose((step(X,12) +transpose(step(X,12) ,12) ) ,4) ) +transpose(echo(transpose(shuffle(X) ,-5) ,4,6) ,7) ) +transpose(((((step(((arpeggio(X) +transpose(transpose(X,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) +shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose(transpose(((X|X) +transpose(echo(X,4,6) ,7) ) ,4) ,7) ) +transpose(step(transpose((X|transpose(X,-5) ) ,-7) ,12) ,12) ) ,7) ) ) ,4) ,4) ) +transpose(((transpose(((echo(((X+transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,4) ) +transpose(((X|X) +echo(X,4,6) ) ,7) ) ,4,6) +transpose(echo(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |echo((X+transpose(X,7) ) ,4,6) ) ) ,4,6) ,4) ) +transpose(step((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+X) ,7) ) +transpose(transpose(transpose(X,4) ,-7) ,12) ) +transpose((shuffle(X) +transpose(shuffle(transpose(X,4) ) ,7) ) ,12) ) +echo(arpeggio(((X+X) |X) ) ,4,6) ) ,12) ,7) ) ,-5) +(echo((((echo((transpose(X,-7) +transpose(X,-7) ) ,4,6) +transpose(transpose(((shuffle((X+transpose(X,7) ) ) +transpose(transpose(X,-5) ,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) ,4) ,-7) ) +((transpose((arpeggio(X) +transpose(X,7) ) ,-7) +(shuffle((arpeggio(X) +transpose(transpose(X,4) ,7) ) ) +transpose((X+X) ,-5) ) ) |((echo(X,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) |arpeggio((X|X) ) ) ) ) +transpose(transpose(((echo(arpeggio(X) ,4,6) +transpose(echo(echo(shuffle(transpose(X,-7) ) ,4,6) ,4,6) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,-5) ,7) ) ,4,6) +shuffle(step(((arpeggio(X) +X) +transpose(arpeggio(shuffle(X) ) ,7) ) ,12) ) ) ) +transpose((((transpose(transpose(step(echo(X,4,6) ,12) ,-5) ,4) +((((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) |step(step(shuffle(X) ,12) ,12) ) +transpose((arpeggio(X) +(X+transpose(X,-7) ) ) ,7) ) ) +transpose(((transpose(transpose(X,-5) ,-7) +transpose(transpose(((((echo(X,4,6) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,-7) ,4) ) +transpose(((step(step(transpose((X+transpose(X,12) ) ,4) ,12) ,12) +transpose(arpeggio((X|X) ) ,4) ) +transpose(((shuffle(X) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,7) ) ,12) ) |echo((((transpose(transpose(X,4) ,-7) +(transpose((X+X) ,4) +((X+transpose((X+X) ,4) ) +transpose(X,7) ) ) ) +transpose(echo(((shuffle(X) +transpose(X,4) ) +transpose(step(shuffle(X) ,12) ,7) ) ,4,6) ,4) ) +transpose(shuffle((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) +transpose(((X+transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) +transpose(shuffle(shuffle(((X+transpose(X,7) ) +(X|X) ) ) ) ,4) ) +transpose(step((echo(X,4,6) +step(transpose(X,-5) ,12) ) ,12) ,7) ) +transpose(transpose((shuffle(X) +step(X,12) ) ,-7) ,-7) ) ) ,7) ) ,4,6) ) ,7) ) ,7) ) +transpose(((echo(echo(((step(arpeggio(echo((transpose(X,-5) |X) ,4,6) ) ,12) +transpose(((arpeggio(echo(X,4,6) ) +transpose(echo(X,4,6) ,-7) ) |((echo(X,4,6) +echo(X,4,6) ) +transpose(transpose((step(transpose(shuffle(X) ,-5) ,12) +transpose((step(X,12) +transpose((X|(X+X) ) ,7) ) ,12) ) ,4) ,12) ) ) ,4) ) +transpose(shuffle(((echo(shuffle(arpeggio(step(X,12) ) ) ,4,6) +transpose(((((transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,-7) +transpose(transpose((echo(X,4,6) |(X+X) ) ,-7) ,4) ) +transpose(transpose((X+shuffle(X) ) ,4) ,7) ) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose((((transpose((X|X) ,-5) +transpose(transpose(X,-7) ,4) ) +transpose(((X|X) +transpose(X,12) ) ,7) ) |X) ,7) ) ,4) ) +transpose(echo(transpose(shuffle(X) ,-7) ,4,6) ,7) ) ) ,7) ) ,4,6) ,4,6) +transpose(((shuffle((echo(transpose(shuffle(transpose(transpose(X,-5) ,-7) ) ,-5) ,4,6) +transpose((((echo(step((X|X) ,12) ,4,6) +transpose(transpose(arpeggio(X) ,-5) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) +(X|arpeggio((X+transpose(X,7) ) ) ) ) ,7) ) ) +transpose(transpose(echo(arpeggio((step(shuffle(X) ,12) +((X|X) +transpose(X,7) ) ) ) ,4,6) ,-5) ,4) ) +transpose(step((arpeggio(((echo((transpose(X,4) +transpose(X,7) ) ,4,6) +transpose(arpeggio(transpose((X|X) ,4) ) ,4) ) +transpose(echo(arpeggio(shuffle(X) ) ,4,6) ,7) ) ) +(arpeggio(step(arpeggio(X) ,12) ) +((((echo(X,4,6) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(X,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ) ) ) ,12) ,7) ) ,4) ) +transpose(arpeggio(shuffle(((shuffle(shuffle(((X+X) +X) ) ) +transpose(transpose(transpose(shuffle((X+transpose(step(X,12) ,7) ) ) ,-5) ,-7) ,4) ) +transpose((step(step((transpose(X,-5) +transpose(arpeggio(X) ,7) ) ,12) ,12) |(((transpose(shuffle(X) ,4) |(echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose((X+(shuffle(X) +transpose(X,7) ) ) ,4) ) +transpose(((shuffle(X) +transpose(X,12) ) +(X+transpose(X,12) ) ) ,7) ) ) ,7) ) ) ) ,7) ) ,4) ) +transpose(shuffle((echo(echo((transpose((((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((X|X) ,12) ) ,-5) +(X+X) ) ,4,6) ,4,6) |echo(step((transpose(arpeggio((X+transpose(X,7) ) ) ,4) +((((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) +transpose(((transpose(X,-7) +transpose(((X+transpose(X,12) ) |X) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) ) ,12) ,4,6) ) ) ,7) ) ,4,6) random seed used was 0 NOTE: Generated phrase was too large ( 41430 ) , it has been truncated at 5000 notes. EXPR = ((step(transpose(transpose(transpose((step(((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +X) ,12) +transpose((shuffle((echo((X+X) ,4,6) +X) ) +transpose(echo(X,4,6) ,-7) ) ,-5) ) ,4) ,-5) ,4) ,12) +transpose((shuffle(shuffle(echo(echo((shuffle(X) +transpose(X,12) ) ,4,6) ,4,6) ) ) +((arpeggio(transpose(step((shuffle(X) |echo(arpeggio(X) ,4,6) ) ,12) ,4) ) +transpose(shuffle((transpose(echo(echo(echo(transpose(shuffle(X) ,4) ,4,6) ,4,6) ,4,6) ,-5) +transpose(echo(((transpose(((((X|X) +transpose((X|X) ,12) ) |arpeggio((X+transpose(X,12) ) ) ) +transpose(shuffle(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) ,-7) +transpose(arpeggio(step(arpeggio(X) ,12) ) ,4) ) +transpose((transpose(((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) +echo(transpose(shuffle(X) ,-5) ,4,6) ) ,7) ) ,4,6) ,-7) ) ) ,4) ) +transpose(transpose((arpeggio((shuffle(step(X,12) ) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,-7) +transpose(step(transpose(X,4) ,12) ,7) ) ,4) ) ) +transpose(((((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |(X|X) ) ) +transpose((step(echo((X+X) ,4,6) ,12) +(((transpose((X+X) ,4) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) +transpose(shuffle(step(X,12) ) ,12) ) ) ,4) ) +transpose(step(step((transpose(X,4) |X) ,12) ,12) ,7) ) +transpose(echo((transpose((X|X) ,-7) +arpeggio(X) ) ,4,6) ,4) ) +transpose(((step(X,12) +transpose(((arpeggio(step(X,12) ) +transpose(shuffle(step(X,12) ) ,7) ) +transpose(transpose(step((X+X) ,12) ,4) ,12) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((transpose(X,4) |step(X,12) ) ,7) ) ,7) ) ,7) ) ,-7) ) ,-7) ,7) ) ) ,4) ) +transpose(shuffle((transpose(arpeggio(echo(step(((shuffle(transpose((transpose(X,-7) +shuffle(X) ) ,-5) ) +transpose(shuffle(step(arpeggio(X) ,12) ) ,4) ) +transpose(((((transpose(step(X,12) ,4) |arpeggio(echo(X,4,6) ) ) +transpose((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose(arpeggio(transpose((transpose(X,4) |(X|X) ) ,-7) ) ,4) ) +transpose(((transpose(echo((X+X) ,4,6) ,4) +transpose((X+(shuffle(X) +transpose(transpose(X,-5) ,12) ) ) ,7) ) +((echo(X,4,6) |arpeggio(X) ) +transpose(echo(X,4,6) ,4) ) ) ,7) ) ,7) ) ,12) ,4,6) ) ,-5) +((arpeggio(arpeggio(arpeggio(shuffle(echo(transpose((echo(echo(echo(X,4,6) ,4,6) ,4,6) +transpose(transpose(X,-5) ,-5) ) ,-7) ,4,6) ) ) ) ) +transpose((((echo(((echo((step(transpose(X,-5) ,12) +(X|X) ) ,4,6) +transpose(arpeggio((X|X) ) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4,6) +transpose(echo(transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) +transpose(arpeggio(X) ,4) ) +transpose((transpose(arpeggio(X) ,-7) |(X|X) ) ,7) ) ,-7) ,4,6) ,4) ) +transpose(echo(transpose(((step(((X+transpose(X,4) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,12) +transpose(step((((X+transpose(X,7) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,-7) ,4) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,12) ,4) ) +transpose(transpose((transpose((X+X) ,4) +shuffle((X+X) ) ) ,-5) ,7) ) ,-7) ,4,6) ,7) ) |(((((((arpeggio((transpose(arpeggio(X) ,4) +X) ) |((arpeggio(X) +transpose(X,-5) ) +transpose(arpeggio(echo(step(X,12) ,4,6) ) ,12) ) ) +transpose(((((shuffle(transpose((X|X) ,-5) ) |X) +transpose(transpose(transpose(((X+X) |shuffle(X) ) ,-5) ,-7) ,4) ) +transpose(shuffle(step(echo((X|X) ,4,6) ,12) ) ,7) ) |((((X|X) +step(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose((echo(X,4,6) +shuffle(X) ) ,4) ,7) ) ) ,4) ) +transpose((shuffle(transpose(step((X+X) ,12) ,-5) ) +transpose(arpeggio((echo(X,4,6) +transpose(X,-7) ) ) ,-7) ) ,7) ) +transpose((((shuffle(step(step(X,12) ,12) ) +transpose(((transpose(transpose(X,-7) ,-5) +transpose((shuffle(arpeggio(X) ) +step((X|X) ,12) ) ,4) ) +transpose(shuffle((transpose(X,4) +transpose(X,4) ) ) ,7) ) ,7) ) +transpose(((step(X,12) +transpose(((((step(X,12) +transpose(transpose(X,4) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(echo(step(arpeggio(X) ,12) ,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) |(arpeggio(((arpeggio(X) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ) |arpeggio(transpose(shuffle(X) ,-7) ) ) ) ,4) ) +transpose((X+transpose(transpose(arpeggio(X) ,-5) ,7) ) ,7) ) ,4) ) +transpose(transpose((((arpeggio(((transpose(X,-7) +transpose((X|arpeggio(X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +transpose((X+transpose(echo(transpose(X,4) ,4,6) ,7) ) ,7) ) +transpose(transpose(echo(shuffle(shuffle(transpose(X,-5) ) ) ,4,6) ,4) ,4) ) +transpose(shuffle(shuffle((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ) ) ,7) ) ,-5) ,7) ) +transpose(transpose(((((step(step(transpose(X,-7) ,12) ,12) +transpose((transpose(X,-5) +transpose(X,7) ) ,4) ) +transpose(step((X+transpose(transpose(X,4) ,7) ) ,12) ,7) ) +(transpose(X,-5) |X) ) |step(((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) +transpose(echo(X,4,6) ,12) ) ,12) ) ,-7) ,4) ) +transpose(((((arpeggio(X) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(shuffle(X) ,7) ) ,7) ) +transpose((arpeggio(shuffle(X) ) |echo(echo(X,4,6) ,4,6) ) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,7) ) ) ,4) ) +transpose(arpeggio((transpose((((((X+transpose(step(X,12) ,12) ) +(shuffle(X) +(X+X) ) ) |transpose(shuffle(transpose(X,-5) ) ,-7) ) +transpose(transpose(shuffle(shuffle(X) ) ,4) ,4) ) +transpose((((echo(X,4,6) |transpose(X,-7) ) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,-5) +transpose(transpose(shuffle(arpeggio((X+transpose(transpose(X,-5) ,7) ) ) ) ,-7) ,7) ) ) ,7) ) ) ) ,7) ) random seed used was 0 EXPR = (((step(transpose(arpeggio(transpose((((step(arpeggio(X) ,12) +transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) +transpose(echo(arpeggio(((X+X) +X) ) ,4,6) ,12) ) ,-5) ) ,-7) ,12) +transpose(echo((echo(shuffle(transpose(((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) ,7) ) ,4) ) ,4,6) +transpose(step(arpeggio(step(transpose(((echo(X,4,6) +transpose(((X|X) +transpose(echo(X,4,6) ,7) ) ,7) ) |arpeggio(X) ) ,4) ,12) ) ,12) ,12) ) ,4,6) ,4) ) +transpose(echo(((echo(step(echo((shuffle(arpeggio((X|X) ) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,12) ,4,6) +transpose(transpose(((echo(X,4,6) +transpose(arpeggio((X+X) ) ,4) ) +transpose(step(X,12) ,7) ) ,4) ,4) ) +transpose(transpose(transpose((X|X) ,4) ,4) ,7) ) ,4,6) ,7) ) |transpose((shuffle((transpose(arpeggio(step((echo(transpose(X,-7) ,4,6) +echo(transpose((X|X) ,-5) ,4,6) ) ,12) ) ,4) +step((step(arpeggio(arpeggio(arpeggio(echo(X,4,6) ) ) ) ,12) |arpeggio(arpeggio(transpose(((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,-5) ) ) ) ,12) ) ) +(transpose((echo((((step(transpose(X,4) ,12) |arpeggio(((X+X) +transpose(shuffle(X) ,12) ) ) ) +transpose(shuffle(((transpose(X,-5) +transpose(transpose(X,4) ,12) ) +transpose(step(X,12) ,-5) ) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,4,6) +transpose(transpose(transpose(X,4) ,-5) ,4) ) ,-5) +transpose((((transpose(echo(step(((arpeggio(shuffle(X) ) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,12) ,4,6) ,4) |(transpose(arpeggio((shuffle(arpeggio(arpeggio(X) ) ) |(arpeggio(X) |(X+X) ) ) ) ,-5) +transpose(echo(transpose(((X+transpose(X,7) ) |arpeggio(X) ) ,4) ,4,6) ,7) ) ) +transpose(arpeggio(shuffle(step(X,12) ) ) ,4) ) +transpose(transpose((transpose(transpose(step((X|X) ,12) ,4) ,4) +step(echo(echo((echo((X+X) ,4,6) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,4,6) ,4,6) ,12) ) ,-7) ,7) ) ,7) ) ) ,-5) ) random seed used was 0

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