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 20 generations the expression "X" became this: transpose(transpose(echo(((step(echo(shuffle((((X|X) +(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) |transpose(transpose(echo(X,4,6) ,-5) ,4) ) ) ,4,6) ,12) +transpose((((step(step(((transpose(arpeggio((transpose(transpose((X+X) ,4) ,4) +transpose(transpose(X,-7) ,12) ) ) ,-5) +(arpeggio(arpeggio(arpeggio(X) ) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ,7) ) ) +transpose((arpeggio(echo(step(transpose(arpeggio(X) ,4) ,12) ,4,6) ) +transpose((((((X|X) +transpose(echo((X+X) ,4,6) ,7) ) |shuffle((echo(X,4,6) +transpose(echo(X,4,6) ,7) ) ) ) +transpose(((transpose(shuffle((arpeggio(X) +transpose(X,12) ) ) ,-5) +transpose(shuffle(step(X,12) ) ,7) ) |transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) ,12) ) +transpose((((arpeggio(transpose(transpose(X,-7) ,-5) ) +transpose((transpose(arpeggio(X) ,4) +transpose(transpose(((X+X) |transpose(X,-7) ) ,-7) ,-7) ) ,4) ) +transpose((((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose(arpeggio((X|echo(X,4,6) ) ) ,7) ) ,7) ) +((X+transpose(transpose(X,-5) ,12) ) +transpose(shuffle(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) ,-5) ) ) ,7) ) ,12) ) ,12) ) ,12) ,12) +transpose(transpose(echo(transpose(transpose((transpose((((shuffle((transpose(X,-7) +transpose(X,7) ) ) +transpose((shuffle(X) +transpose((X+X) ,7) ) ,12) ) +transpose(arpeggio(step(step(((X|X) |(X+X) ) ,12) ,12) ) ,4) ) +transpose(transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-5) ,-7) ,7) ) ,-7) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,-5) ,-5) ,4,6) ,-7) ,12) ) +transpose(arpeggio(((shuffle(((((X+X) +((transpose(X,4) |X) |X) ) +transpose(transpose(X,4) ,4) ) +step(echo((transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ,4) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,4,6) ,12) ) ) +transpose((arpeggio(((X|transpose(X,4) ) +shuffle(transpose(X,4) ) ) ) +transpose((transpose(X,4) |((X+X) +transpose(X,12) ) ) ,12) ) ,-7) ) +transpose(((shuffle((echo((arpeggio((X+transpose(X,12) ) ) +transpose(X,12) ) ,4,6) |(arpeggio(X) +transpose(((X+transpose(transpose(X,4) ,7) ) +(arpeggio((X+transpose(X,12) ) ) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) ) ,7) ) ) ) +transpose(arpeggio((echo(((echo((arpeggio((X+X) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,12) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) |arpeggio(X) ) ,-5) ,7) ) ,4,6) +((((arpeggio(transpose(X,-5) ) +transpose(arpeggio((X|X) ) ,-5) ) +transpose(((transpose(X,4) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose(echo(echo(transpose(X,4) ,4,6) ,4,6) ,7) ) ,4) ) +transpose((((X+((X+transpose(X,4) ) +transpose(X,7) ) ) |step(step(X,12) ,12) ) +transpose(echo(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ,4,6) ,12) ) ,7) ) +(transpose((transpose(X,-5) |X) ,4) |step((step(X,12) |transpose(X,-7) ) ,12) ) ) ) ) ,12) ) +transpose(((transpose((echo(arpeggio(transpose(X,4) ) ,4,6) +(X+X) ) ,4) +transpose((((((transpose(transpose(X,-5) ,4) |transpose(X,4) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) +transpose(((X+transpose(X,12) ) |(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) +((X|X) +(X+(X+transpose(X,7) ) ) ) ) ) ,4) ) +transpose(transpose((X+transpose(transpose(X,-7) ,12) ) ,-7) ,7) ) ,7) ) +transpose(shuffle((arpeggio(X) +transpose(((transpose(transpose((X|X) ,-7) ,4) |transpose((X|X) ,-5) ) +transpose(step(X,12) ,-5) ) ,12) ) ) ,12) ) ,12) ) ,12) ) ) ,4) ) +transpose(((((transpose((transpose(transpose(transpose(transpose(transpose(transpose(X,4) ,-7) ,4) ,-5) ,-7) ,-7) |transpose(echo(echo(X,4,6) ,4,6) ,4) ) ,-5) |step((transpose(((((step(transpose(X,4) ,12) +transpose((X|X) ,4) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,7) ) |shuffle(transpose(echo(shuffle(X) ,4,6) ,-7) ) ) +shuffle(transpose(transpose((X|X) ,-5) ,-5) ) ) ,-5) +shuffle(transpose(X,4) ) ) ,12) ) |step(transpose(transpose((((X+X) +transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) +transpose(((((transpose(X,-5) +transpose(echo(X,4,6) ,4) ) +transpose((transpose(X,4) +arpeggio(X) ) ,7) ) +transpose((arpeggio(shuffle(X) ) +((X+transpose(X,12) ) +(X+transpose(X,12) ) ) ) ,4) ) +transpose(X,7) ) ,7) ) ,-7) ,-5) ,12) ) +transpose(step(transpose(transpose(echo(((((X+X) +transpose((X|X) ,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((arpeggio(X) |transpose(shuffle((X+X) ) ,4) ) ,12) ) ,4,6) ,-5) ,4) ,12) ,7) ) +((arpeggio(echo(step((transpose((shuffle(echo(X,4,6) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) ,-7) ) ,-7) |arpeggio((echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((transpose((X+transpose(X,12) ) ,4) +X) ,7) ) ,4,6) +transpose(echo((transpose(arpeggio(X) ,4) +transpose(X,12) ) ,4,6) ,7) ) ) ) ,12) ,4,6) ) +arpeggio((((((((X+X) +(X+transpose(X,12) ) ) +X) +(transpose(X,4) +transpose(X,12) ) ) +transpose(arpeggio(transpose((arpeggio(step(X,12) ) +transpose((X|X) ,12) ) ,-7) ) ,12) ) +transpose((((arpeggio(transpose(transpose(X,-7) ,-5) ) |transpose(((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ) +transpose(((transpose(transpose(transpose(X,-7) ,-7) ,-5) +transpose((transpose(transpose((X+transpose(X,7) ) ,4) ,-7) +(transpose((X+transpose(X,12) ) ,-5) +transpose((transpose(X,4) +(X+X) ) ,7) ) ) ,4) ) +transpose((echo(shuffle((X+transpose((X+transpose(X,12) ) ,12) ) ) ,4,6) +transpose(arpeggio((X+X) ) ,12) ) ,7) ) ,4) ) +transpose(transpose(transpose(transpose((X|X) ,4) ,4) ,-7) ,7) ) ,4) ) +transpose(transpose((transpose((step(transpose((X+X) ,4) ,12) +transpose(step(((X|X) +transpose(transpose(X,-7) ,7) ) ,12) ,7) ) ,-7) +transpose((transpose(X,-5) +transpose((X+X) ,4) ) ,4) ) ,-5) ,7) ) ) ) +(transpose((arpeggio(((((X+transpose((X+X) ,12) ) +transpose((X+X) ,7) ) +transpose((X+X) ,12) ) +transpose((X+(transpose((X+transpose(X,7) ) ,-5) +transpose(((X|X) +step(X,12) ) ,12) ) ) ,7) ) ) |step(((echo(transpose(X,-5) ,4,6) +X) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ,12) ) ,-7) +(transpose(shuffle(((transpose(echo(X,4,6) ,-7) +(X|transpose(X,-7) ) ) +transpose(transpose(transpose(X,4) ,-7) ,4) ) ) ,-5) |(shuffle(shuffle(transpose(step((X+transpose(X,7) ) ,12) ,-7) ) ) |transpose(arpeggio(step((((X+X) |step(X,12) ) +transpose(shuffle(X) ,12) ) ,12) ) ,-5) ) ) ) ) ) ,7) ) ,4) ) +transpose(transpose((transpose(shuffle(transpose(((X+transpose(((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) +transpose((X+step(X,12) ) ,12) ) ,4) ) ,-7) |(((arpeggio(transpose((transpose(transpose(X,-5) ,4) +(transpose(X,-7) +transpose(step(X,12) ,7) ) ) ,-7) ) +(transpose((X|((transpose(X,4) +transpose(X,-5) ) |((X+transpose(X,12) ) +transpose(X,-5) ) ) ) ,4) +transpose(((echo((X|(X+transpose(X,12) ) ) ,4,6) +transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio(((step((X+transpose(X,12) ) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ,7) ) ,12) ) ) +transpose(arpeggio((transpose(echo(step(transpose(X,-5) ,12) ,4,6) ,-7) +transpose(transpose((X+X) ,-7) ,12) ) ) ,7) ) +echo(transpose(((arpeggio((transpose((X+X) ,-5) +((X+(X+X) ) |X) ) ) +transpose(((transpose(shuffle((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) +shuffle((X+X) ) ) ) ,-5) +transpose(transpose(echo(((X+transpose(transpose(X,-5) ,7) ) +X) ,4,6) ,-7) ,7) ) |(X+transpose(arpeggio(X) ,7) ) ) ,4) ) +transpose(((transpose(transpose((((X+X) +X) |(X+transpose(transpose(X,-7) ,12) ) ) ,-7) ,-5) +transpose(((step(transpose(step(X,12) ,-7) ,12) +transpose((((transpose(X,4) +transpose(X,-5) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,-5) ) +transpose(transpose(transpose(step((X+X) ,12) ,-7) ,4) ,-7) ) ,4) ) +transpose((transpose(arpeggio((transpose(X,4) |(X+(X+X) ) ) ) ,-5) |transpose(X,4) ) ,7) ) ,7) ) ,4) ,4,6) ) ) ,-5) ,7) ) ,4,6) ,4) ,-5) random seed used was 88 NOTE: Generated phrase was too large ( 24880 ) , it has been truncated at 5000 notes. EXPR = ((((transpose(shuffle(transpose(arpeggio(transpose(transpose(transpose(X,-7) ,-5) ,-5) ) ,-5) ) ,-5) +((transpose((((arpeggio(((X+transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose(((X+transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose(((echo(transpose(X,4) ,4,6) +transpose(((X+X) +(X+transpose(X,12) ) ) ,-7) ) +transpose(echo((((X+X) +transpose(X,12) ) +echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,4,6) ,12) ) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) |transpose(transpose(X,-5) ,-7) ) ,7) ) ,4) |((echo(transpose(X,-5) ,4,6) +transpose(arpeggio(shuffle(X) ) ,4) ) |transpose(X,-7) ) ) +transpose((transpose(transpose(X,4) ,-5) +transpose(((transpose(((X+X) +(transpose(X,-5) +transpose((((X|X) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ) ,4) +transpose((echo(transpose(arpeggio(X) ,4) ,4,6) +transpose((shuffle(step(X,12) ) |shuffle(echo(transpose(X,4) ,4,6) ) ) ,12) ) ,4) ) +transpose(transpose(((((X+transpose(X,7) ) |(X|X) ) |transpose((X|X) ,4) ) +transpose(X,7) ) ,-5) ,7) ) ,12) ) ,12) ) ) +transpose(transpose((transpose(arpeggio(transpose(transpose(echo(arpeggio(X) ,4,6) ,-7) ,-5) ) ,4) |((shuffle(X) +transpose(X,4) ) +(((transpose((transpose(echo(X,4,6) ,-5) |X) ,4) +transpose(((transpose(arpeggio(X) ,-5) +transpose(((X|X) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,4) ) +transpose(((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) +transpose((X+X) ,12) ) ,7) ) +(((X+X) +transpose(X,-7) ) +(step(arpeggio(X) ,12) +transpose(step(X,12) ,7) ) ) ) ) ) ,4) ,7) ) +transpose(shuffle(transpose(transpose(transpose(echo(X,4,6) ,-5) ,4) ,-5) ) ,7) ) |(((shuffle((transpose(transpose(echo(step(X,12) ,4,6) ,-5) ,4) |(((X+X) +transpose((transpose(X,-5) +(X|X) ) ,7) ) +((transpose(transpose(X,4) ,-7) +transpose(step(transpose(X,-7) ,12) ,12) ) +(((arpeggio(X) +X) |(step(X,12) +transpose((X|X) ,7) ) ) |step((X+X) ,12) ) ) ) ) ) +transpose(arpeggio(echo((((((X+X) +X) +transpose(X,7) ) |transpose((X|X) ,-5) ) |(transpose((X+transpose(X,7) ) ,-7) +transpose((step(X,12) +transpose(X,-7) ) ,7) ) ) ,4,6) ) ,12) ) +transpose(transpose((step(((X+transpose(((((X|X) +(X|X) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) +transpose(X,-7) ) ,4) ) +transpose(((transpose(transpose(X,4) ,4) +transpose(step(arpeggio(X) ,12) ,4) ) +transpose(((X+transpose(X,7) ) |transpose(step(X,12) ,-5) ) ,7) ) ,7) ) ,12) |(transpose(transpose(step(transpose(X,4) ,12) ,-7) ,4) |arpeggio(echo(((X+transpose(((X+X) |transpose(X,4) ) ,-5) ) +((X+transpose((arpeggio(X) |X) ,12) ) +transpose(transpose((X|X) ,-5) ,7) ) ) ,4,6) ) ) ) ,-5) ,4) ) +transpose(arpeggio(transpose((transpose((transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,-7) +transpose(((((X+transpose(X,12) ) +step(X,12) ) +(transpose(X,-7) +transpose(X,4) ) ) +echo(step(X,12) ,4,6) ) ,7) ) ,-5) +echo((((transpose((X+transpose(X,12) ) ,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose((echo(X,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,4) ,12) ) ,4,6) ) ,4) ) ,7) ) ) random seed used was 0

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