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: (transpose(arpeggio(((transpose(transpose(((transpose((X|X) ,-7) +transpose((((shuffle(transpose(X,4) ) +transpose(((X+X) +transpose(arpeggio(X) ,12) ) ,7) ) |arpeggio(step(transpose(X,-7) ,12) ) ) |transpose((X|X) ,4) ) ,4) ) +transpose(transpose(transpose(transpose((step(X,12) +(X+transpose(X,12) ) ) ,-5) ,-5) ,-7) ,7) ) ,4) ,-7) +transpose(echo((((transpose(X,-7) +step(arpeggio((((X+X) +transpose((X|X) ,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) ) ,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) |(((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((step(X,12) +transpose((X+X) ,7) ) ,7) ) +transpose((X+transpose(X,7) ) ,12) ) ) ,7) ) |transpose(transpose(shuffle((((X+X) +transpose(transpose(X,4) ,12) ) +shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ) ,4) ,-5) ) ,4,6) ,12) ) +transpose((((((transpose(transpose(arpeggio(transpose(X,4) ) ,4) ,4) +transpose(transpose(transpose(((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |X) ,4) ,4) ,7) ) +transpose((transpose(echo(((((arpeggio((X+transpose(X,7) ) ) +transpose(transpose(X,-5) ,-7) ) +(((X|X) |echo(X,4,6) ) +transpose(((((X+X) +transpose(X,7) ) +transpose(((X|X) +X) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ) +transpose((((X+transpose(X,7) ) +transpose((transpose(X,-5) +transpose((X+X) ,7) ) ,7) ) +arpeggio(echo(X,4,6) ) ) ,4) ) +transpose(step(echo((X+transpose(X,12) ) ,4,6) ,12) ,7) ) ,4,6) ,4) |shuffle(((transpose(((X|(X+transpose(X,7) ) ) |shuffle(shuffle(X) ) ) ,4) +transpose((X+transpose(X,12) ) ,-5) ) |transpose((transpose((X+transpose(X,7) ) ,-7) +transpose(arpeggio(X) ,7) ) ,-7) ) ) ) ,12) ) +transpose((transpose(((transpose(X,-5) +transpose(X,7) ) |echo(step(X,12) ,4,6) ) ,-7) |transpose(((step((X|X) ,12) |transpose(transpose(X,-5) ,-7) ) +step(X,12) ) ,4) ) ,-7) ) +transpose(((transpose(transpose((((((echo(X,4,6) +transpose(X,12) ) +transpose(((X|X) +transpose(transpose(shuffle(X) ,4) ,7) ) ,4) ) +transpose((arpeggio(X) +transpose((transpose((X+X) ,4) +transpose((echo(X,4,6) +(X+X) ) ,12) ) ,12) ) ,7) ) |((transpose(transpose((X+X) ,-5) ,-7) |(transpose((X|X) ,4) +transpose(transpose((X+X) ,4) ,12) ) ) +shuffle(((X|X) +transpose((X|(X|X) ) ,12) ) ) ) ) |((X+transpose(shuffle(X) ,7) ) +transpose(transpose((transpose(X,-7) |(X|X) ) ,4) ,7) ) ) ,-5) ,-7) +transpose(arpeggio(((echo(shuffle((X+(X+transpose(X,7) ) ) ) ,4,6) +((transpose(X,-7) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) ,-7) ,4) ) +transpose((((X+transpose((X|X) ,4) ) +transpose((transpose(X,-7) +X) ,7) ) |(X|(X+X) ) ) ,7) ) ) +transpose(transpose(arpeggio(transpose((transpose(X,4) +(X+X) ) ,4) ) ,-5) ,7) ) ) ,4) ) +transpose((echo((step(transpose(X,4) ,12) +transpose(transpose(step(X,12) ,-5) ,-7) ) ,4,6) +transpose(echo(shuffle((X+X) ) ,4,6) ,12) ) ,7) ) ,4) ) +transpose((transpose((((X+(shuffle((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ) +(transpose(X,-5) +(X+X) ) ) ) +transpose(transpose(transpose(shuffle((X+transpose(X,12) ) ) ,4) ,4) ,12) ) |shuffle(transpose(step(X,12) ,4) ) ) ,-7) +shuffle(shuffle(arpeggio(transpose(echo((X+X) ,4,6) ,-5) ) ) ) ) ,7) ) ,7) ) ) ,4) +echo((arpeggio(step(transpose((transpose(echo(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) |((X+((X+transpose(X,4) ) +transpose(X,7) ) ) |transpose(X,4) ) ) ,-5) ,4,6) ,4) +transpose(arpeggio(arpeggio((((transpose(transpose(X,-7) ,-7) +transpose(X,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) +transpose((transpose(X,4) |X) ,7) ) ) ) ,4) ) ,-5) ,12) ) +(((transpose(((((step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) +transpose(((X|X) +(transpose(transpose(X,4) ,-5) |step(X,12) ) ) ,-7) ) +((transpose(echo((transpose((X+step(X,12) ) ,4) |(((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,7) ) ) ) ,4,6) ,4) +transpose(shuffle(transpose(((X|X) |(X+X) ) ,-5) ) ,4) ) +transpose(transpose(transpose(transpose(((transpose(X,-7) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,4) ,4) ,-7) ,7) ) ) |(transpose(echo(((transpose(X,4) +X) +transpose(transpose(X,-5) ,-7) ) ,4,6) ,-5) +transpose((transpose(shuffle(arpeggio(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,4) +transpose((((((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) +((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) |((arpeggio(X) +transpose(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,7) ) +transpose((transpose(X,-7) |transpose(X,-5) ) ,12) ) ,4) ) +transpose((((X+X) +(X+transpose(X,12) ) ) |transpose((X+transpose(X,12) ) ,-5) ) ,7) ) ) ,12) ) ,12) ) ) +(shuffle((((shuffle(X) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose((X+X) ,7) ) |transpose(transpose(X,-7) ,-5) ) ) +transpose(((step(((X+transpose(X,12) ) +transpose((X|X) ,12) ) ,12) +transpose(transpose((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,4) ,7) ) |(transpose((X+transpose(X,12) ) ,4) +transpose((X|X) ,4) ) ) ,4) ) ) ,-7) |(((transpose(echo(((((X|X) +transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) |(((X|X) +transpose((X+X) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +(step(X,12) +transpose(transpose(step(X,12) ,4) ,12) ) ) ,4,6) ,-7) +transpose(echo(shuffle((transpose(transpose(X,4) ,-5) +transpose((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +X) ,-5) ) ) ,4,6) ,4) ) +transpose((transpose(transpose((((X|X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,12) ) |(transpose(X,-5) +transpose(step((X|X) ,12) ,7) ) ) ,-5) ,-7) |(shuffle((transpose(arpeggio(X) ,-7) +transpose((((X|X) +(X+transpose(X,12) ) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,7) ) ) +((((transpose((transpose(X,-7) +(X|X) ) ,4) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) +transpose(((transpose(((X+X) +transpose((X+X) ,12) ) ,-7) +(arpeggio(X) |transpose(X,-5) ) ) +transpose(((((transpose((X+transpose(X,7) ) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose((arpeggio(X) +transpose(X,-7) ) ,7) ) ,7) ) ,4) ) +transpose((transpose(transpose(X,-5) ,-5) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,7) ) ) ) ,7) ) +step(transpose(echo(transpose((arpeggio((transpose(X,-7) |shuffle(X) ) ) +transpose(echo(X,4,6) ,-5) ) ,-5) ,4,6) ,-7) ,12) ) ) +transpose(transpose(step(((transpose(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,4) +transpose(step(step(((X+X) +transpose(echo(X,4,6) ,12) ) ,12) ,12) ,4) ) +transpose(arpeggio((((transpose(X,-7) +transpose(transpose(transpose(transpose(X,4) ,-7) ,-7) ,4) ) +transpose((transpose(X,-7) |((X+transpose(X,12) ) |transpose(X,-7) ) ) ,7) ) +transpose((transpose((X+transpose(shuffle((X+X) ) ,12) ) ,-7) +transpose(transpose(transpose((X+X) ,4) ,-7) ,12) ) ,12) ) ) ,7) ) ,12) ,4) ,4) ) +transpose(((((((echo(X,4,6) |(X|X) ) +transpose(shuffle(step(X,12) ) ,12) ) +transpose(transpose((transpose((((transpose(X,-5) +transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |X) ,4) +transpose((shuffle(((X|X) |shuffle(X) ) ) +transpose(((X|X) |X) ,12) ) ,7) ) ,4) ,7) ) +transpose(transpose(transpose(arpeggio((X+transpose(arpeggio(X) ,7) ) ) ,-5) ,-7) ,4) ) +transpose((step((step((((X+X) |(X|X) ) |transpose(X,-7) ) ,12) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose((transpose(X,-5) +X) ,7) ) ,4) ) +transpose(arpeggio(shuffle(arpeggio(X) ) ) ,7) ) +transpose((((X|X) |(X|X) ) +transpose((X|X) ,-7) ) ,-5) ) ,12) ) ,12) +shuffle((arpeggio(arpeggio(X) ) +transpose((X|X) ,12) ) ) ) ,7) ) +transpose(transpose(arpeggio((((((transpose((X|X) ,-7) +arpeggio(transpose(X,-7) ) ) +transpose(((X+transpose(X,7) ) |(transpose(X,-5) +transpose(step(X,12) ,7) ) ) ,12) ) +transpose(transpose(X,-5) ,7) ) |(echo((X+X) ,4,6) |transpose((X+transpose(X,12) ) ,4) ) ) |(transpose((transpose(X,-7) |shuffle((X+transpose(X,7) ) ) ) ,4) +transpose((echo(X,4,6) +transpose(transpose(X,-7) ,7) ) ,12) ) ) ) ,4) ,12) ) ,7) ) ) ,4,6) ) random seed used was 36533249 NOTE: Generated phrase was too large ( 11052 ) , it has been truncated at 5000 notes. EXPR = echo(((transpose((transpose((((transpose(shuffle(transpose(transpose(X,-7) ,-5) ) ,4) +transpose(step(transpose(shuffle((X+transpose(X,12) ) ) ,-7) ,12) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose((X|X) ,-7) ,7) ) ,7) ) +(transpose(X,-7) |(X+transpose(X,4) ) ) ) ,4) +(echo((transpose(((step(X,12) +transpose(step(X,12) ,7) ) +transpose(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose((X|X) ,7) ) ,7) ) ,-7) +transpose(((transpose(echo(transpose(transpose(X,-5) ,-7) ,4,6) ,-7) |transpose(shuffle((X+transpose(X,12) ) ) ,-5) ) +(((transpose((X+transpose(X,12) ) ,4) +transpose(step(echo(X,4,6) ,12) ,7) ) |(X|X) ) +transpose(((transpose(transpose((X+transpose(X,7) ) ,-7) ,4) +transpose((((X|X) +transpose(X,-5) ) +X) ,4) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,-7) ) ,7) ) ,12) ) ) ,7) ) ,4,6) +transpose((arpeggio((shuffle(shuffle(X) ) |shuffle(shuffle((X+X) ) ) ) ) +((echo(shuffle((X+transpose(X,12) ) ) ,4,6) +transpose(transpose((transpose(transpose(X,4) ,-5) +X) ,-7) ,7) ) +transpose(transpose((transpose(arpeggio(X) ,-5) +transpose(transpose(X,4) ,12) ) ,-7) ,12) ) ) ,-7) ) ) ,4) |transpose(arpeggio(transpose(transpose(echo(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,4,6) ,4) ,4) ) ,4) ) +((arpeggio(transpose(((transpose(X,-7) |(echo(X,4,6) +(X+X) ) ) +transpose(transpose(X,-7) ,-5) ) ,-5) ) +transpose(transpose((transpose(echo(((arpeggio((step(X,12) |((echo(X,4,6) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ) ) +transpose(((shuffle(transpose((X+transpose(X,7) ) ,-5) ) +transpose((((arpeggio(arpeggio(X) ) +transpose((X|X) ,12) ) +X) +transpose((((X+(X+transpose(X,12) ) ) +transpose((echo(X,4,6) |X) ,4) ) +transpose(((X+X) +transpose(X,12) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(transpose((X|X) ,4) ,-7) ,7) ) ,4) ) +transpose((((X|X) +transpose((X+X) ,12) ) |(transpose((X+X) ,-7) +((shuffle(X) +transpose(step(X,12) ,7) ) |echo(X,4,6) ) ) ) ,7) ) ,4,6) ,4) +(((transpose(((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4) +transpose(step(transpose((transpose(transpose(X,-5) ,4) |X) ,4) ,12) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) |transpose(shuffle(transpose(shuffle(((echo(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,4,6) +transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose((X|(X|X) ) ,7) ) ) ,-7) ) ,-7) ) ) ,-7) ,4) ) +transpose(transpose(shuffle(transpose(transpose((shuffle(X) |transpose(transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) ,-7) ,-5) ) ,4) ,-5) ) ,4) ,7) ) ) ,4,6) random seed used was 0 NOTE: Generated phrase was too large ( 9240 ) , it has been truncated at 5000 notes.

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