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(arpeggio(transpose(step(((transpose((echo(transpose(X,-7) ,4,6) +transpose(transpose((echo(X,4,6) |step((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,-5) ,12) ) ,-7) |(transpose((transpose(transpose(X,-5) ,-7) +transpose(((transpose((X+transpose(X,7) ) ,4) +transpose((shuffle(X) |X) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ,-7) +transpose(step(transpose(transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,-7) ,12) ,12) ) ) +transpose(((((X+X) +transpose(arpeggio(arpeggio((transpose(X,-7) +arpeggio(transpose(X,-7) ) ) ) ) ,12) ) +transpose(((echo((X+transpose(X,12) ) ,4,6) |step(X,12) ) +arpeggio(((X|X) +transpose((X+transpose(X,12) ) ,4) ) ) ) ,4) ) +transpose((((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) +transpose(step(transpose(X,-5) ,12) ,7) ) +transpose(echo(arpeggio(step(X,12) ) ,4,6) ,7) ) ,7) ) ,12) ) ,12) ,-7) ) ,4) +transpose(transpose(transpose(shuffle(shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ) ,-7) ,-7) ,7) ) +transpose(transpose(transpose(arpeggio(step(arpeggio(transpose(((transpose(((arpeggio(shuffle(echo(transpose(X,-7) ,4,6) ) ) +transpose(shuffle(transpose(transpose(shuffle(X) ,-5) ,-7) ) ,4) ) +transpose((transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |X) ,-7) +transpose(shuffle(step(X,12) ) ,12) ) ,7) ) ,4) +step(transpose(shuffle(step(X,12) ) ,4) ,12) ) +transpose(((transpose(transpose((((X+transpose(X,7) ) |echo(X,4,6) ) +transpose(((echo(X,4,6) +transpose((X+X) ,4) ) +transpose(X,7) ) ,7) ) ,-7) ,-5) +transpose(transpose(echo(shuffle((X+X) ) ,4,6) ,-5) ,4) ) +transpose(transpose(step(((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,12) ,-7) ,7) ) ,12) ) ,-7) ) ,12) ) ,-7) ,-7) ,12) ) ,-5) +transpose(transpose(((((echo(((arpeggio(((step(transpose(step(echo(X,4,6) ,12) ,4) ,12) +transpose((transpose(arpeggio(transpose(transpose(X,4) ,-5) ) ,-7) +((((((transpose(X,-7) +transpose(X,-7) ) +(X+transpose(X,7) ) ) +transpose(((transpose((X+transpose(X,12) ) ,4) +transpose(echo(arpeggio(echo(X,4,6) ) ,4,6) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ,7) ) ,7) ) +transpose(step(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(((X+transpose(X,12) ) +shuffle(X) ) ,7) ) +transpose(((X+X) +transpose((X+transpose(X,12) ) ,-7) ) ,12) ) ,12) ,7) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(((step(transpose(X,4) ,12) +transpose(echo((X+transpose(X,7) ) ,4,6) ,12) ) |(arpeggio(shuffle(X) ) +transpose((step(X,12) |echo(X,4,6) ) ,7) ) ) ,12) ) ,4) ) +transpose((X+X) ,7) ) ) ,4) ) +transpose(transpose(((transpose(arpeggio(transpose(step(X,12) ,4) ) ,-5) +transpose(transpose((transpose(X,-7) +transpose(X,7) ) ,-7) ,7) ) +transpose((transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,-5) +transpose(shuffle(echo(transpose(shuffle(X) ,-7) ,4,6) ) ,7) ) ,12) ) ,-7) ,7) ) ) +transpose(transpose((transpose(transpose(shuffle(transpose(echo(arpeggio(step(X,12) ) ,4,6) ,4) ) ,-5) ,-5) +transpose((arpeggio(transpose(step(X,12) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,7) ) ,-7) ,7) ) +transpose(transpose(arpeggio(transpose(step(((step(step(X,12) ,12) +transpose(step(transpose(transpose(((arpeggio(X) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,4) ,-7) ,12) ,4) ) +transpose(((arpeggio(X) +transpose(((X+transpose(X,12) ) |X) ,12) ) +transpose(arpeggio(arpeggio(transpose(shuffle(X) ,-5) ) ) ,12) ) ,7) ) ,12) ,-7) ) ,4) ,7) ) ,4,6) |(transpose((step(transpose(transpose((((X+transpose(step(X,12) ,4) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ,-5) ,12) +transpose((((((transpose((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) |(((X+transpose(arpeggio(X) ,4) ) +transpose((X+(X+transpose(X,7) ) ) ,7) ) +shuffle(step(transpose(X,-5) ,12) ) ) ) ,-5) +transpose((((transpose(X,-7) +(X+transpose(X,12) ) ) +shuffle((X+transpose(X,12) ) ) ) +transpose(((transpose(step(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) ,12) ,-7) +transpose(arpeggio((((X|X) +transpose((echo(X,4,6) +transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,12) ) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ,7) ) ,4) ) +transpose((((((echo((((X+transpose((X|X) ,12) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) +transpose(shuffle(transpose((step(X,12) +(X+transpose(X,12) ) ) ,4) ) ,12) ) +transpose(step((X|X) ,12) ,7) ) +transpose((shuffle((transpose((X+transpose(X,7) ) ,-7) +transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ) +transpose(echo((step(echo(X,4,6) ,12) +transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) ,7) ) ,4,6) ,12) ) ,4) ) +transpose(arpeggio(echo(((arpeggio(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ) ,7) ) +transpose((shuffle(echo((X+transpose(X,12) ) ,4,6) ) +transpose(transpose(X,-5) ,12) ) ,12) ) ,7) ) |((arpeggio(X) +echo((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,4,6) ) +transpose(step(transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ,12) ,12) ) ) +transpose((step((transpose(((shuffle(X) |(transpose(X,-7) +transpose(echo(X,4,6) ,7) ) ) +((transpose(X,-7) +transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose(X,7) ) ) ,-7) +transpose((((step(X,12) +transpose((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,4) ) +transpose(transpose(echo(step(echo(X,4,6) ,12) ,4,6) ,-7) ,7) ) +arpeggio((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) ) ,7) ) ,12) |shuffle(transpose((((((shuffle(X) +transpose(step(X,12) ,12) ) +transpose(X,12) ) +transpose(arpeggio(X) ,7) ) +transpose(arpeggio(((X+transpose(X,7) ) +transpose(((X+transpose(X,12) ) +X) ,7) ) ) ,4) ) +transpose(echo(((shuffle((X+transpose(X,12) ) ) +transpose(transpose(X,-5) ,-7) ) +transpose(((arpeggio(step(X,12) ) +transpose(echo(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,12) ) ,4,6) ,7) ) ,-7) ) ) ,4) ) +transpose((transpose(((echo(X,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose((X|X) ,7) ) ,-5) +transpose((((transpose((echo(X,4,6) +transpose(transpose(X,4) ,12) ) ,-5) +transpose(arpeggio(transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) ,4) ) +transpose(echo(((((X+transpose(X,7) ) |((X|X) +transpose(transpose(X,-7) ,12) ) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose((X+X) ,12) ) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,4,6) ,7) ) +transpose(step(arpeggio(shuffle(((echo(X,4,6) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ) ,12) ,7) ) ,12) ) ,7) ) ,7) ) ,-7) |(((transpose(step((transpose((X+transpose((X+X) ,12) ) ,4) +transpose(((step(X,12) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,12) ,-7) +transpose((transpose(((X+transpose(transpose(X,-7) ,7) ) +(transpose(transpose(X,4) ,-5) +transpose(step(echo(X,4,6) ,12) ,-7) ) ) ,-7) +transpose(step(shuffle(echo(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ,4,6) ) ,12) ,12) ) ,4) ) +transpose(transpose(shuffle(transpose((X+transpose(transpose(X,4) ,12) ) ,-5) ) ,-5) ,7) ) +transpose(transpose((transpose((arpeggio(echo(((shuffle(X) +X) +transpose(transpose(step(X,12) ,-7) ,7) ) ,4,6) ) +arpeggio(shuffle(X) ) ) ,-5) +(step(transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) ,12) |((shuffle(X) +(X|X) ) |(transpose(shuffle(echo(X,4,6) ) ,-5) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) ) ) ,4) ,12) ) ) ) +(arpeggio(shuffle((transpose(transpose(transpose(transpose(step(transpose(shuffle(X) ,-5) ,12) ,-7) ,-7) ,-7) ,-7) +((arpeggio(echo(((transpose(X,-7) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ) +transpose(((transpose(X,-7) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose(X,7) ) ,7) ) +transpose(step((((X+transpose(X,12) ) +(X|(X+transpose(X,12) ) ) ) +transpose(((shuffle(X) |step(transpose(X,-7) ,12) ) |(echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,12) ) ,12) ,7) ) ) ) ) +transpose((((((((transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) |arpeggio(((transpose(step(X,12) ,-7) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(arpeggio(X) ,7) ) ) ) +transpose((echo((echo(echo(X,4,6) ,4,6) |step((transpose(X,-7) +transpose(arpeggio(X) ,12) ) ,12) ) ,4,6) +transpose(transpose(((step(X,12) +transpose(X,4) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,-5) ,7) ) ,7) ) +transpose(transpose(transpose(shuffle((X+transpose(echo(transpose(transpose(X,4) ,-5) ,4,6) ,12) ) ) ,-7) ,4) ,-7) ) +(((transpose((((echo(X,4,6) |(transpose(X,-7) +X) ) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) +transpose(shuffle((((((X+transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(X,-7) ) +transpose((((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose(((step(X,12) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) ,4) ) +transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,-7) ,-7) ,7) ) +transpose(transpose(step(transpose(transpose(X,-5) ,-7) ,12) ,4) ,12) ) ) +transpose(((transpose(transpose(((X+transpose(((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(X,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ,7) ) ,7) ) ,-7) ,4) +transpose((arpeggio(shuffle(step(shuffle(transpose(X,4) ) ,12) ) ) +transpose(transpose(arpeggio(step(transpose(echo(X,4,6) ,-7) ,12) ) ,-5) ,12) ) ,4) ) +transpose(((((((transpose(arpeggio(X) ,-7) +transpose((arpeggio((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) +transpose(((X+X) +(X+X) ) ,7) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) +transpose(((X+transpose(echo(transpose(X,-7) ,4,6) ,-5) ) +transpose(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,12) ) ,12) ) +transpose(arpeggio(echo((X+transpose(X,7) ) ,4,6) ) ,4) ) +transpose((shuffle(shuffle(X) ) +transpose(transpose(transpose(arpeggio(X) ,-7) ,-7) ,7) ) ,7) ) +transpose(echo(echo((arpeggio((X+transpose(X,12) ) ) +transpose(X,-7) ) ,4,6) ,4,6) ,7) ) ,7) ) ,4) ) +transpose(arpeggio(transpose(arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,-7) ) ,7) ) |echo((transpose(transpose(((step(X,12) |echo(X,4,6) ) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ,-7) ,4) +transpose(((((transpose(X,-7) +X) +echo((X+transpose(X,12) ) ,4,6) ) |echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,12) ) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ,4,6) ) +(transpose(step(X,12) ,-5) |((step(arpeggio(X) ,12) +transpose((((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(step(X,12) ,4) ) +transpose((X+step(X,12) ) ,7) ) ,4) ) +transpose(echo((transpose(X,4) +transpose(arpeggio(X) ,12) ) ,4,6) ,7) ) ) ) ,7) ) ,4,6) ) ,7) ) ) +transpose((step(echo(transpose(transpose(transpose(transpose(transpose(((shuffle(X) |(X+X) ) +transpose((transpose((X+transpose(X,7) ) ,-7) |(arpeggio(X) +transpose(X,12) ) ) ,12) ) ,-7) ,-5) ,-7) ,-7) ,-7) ,4,6) ,12) +transpose(shuffle((shuffle((step((((arpeggio(X) +transpose(step(X,12) ,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,12) +transpose((echo(X,4,6) +X) ,7) ) ) +transpose(arpeggio((((echo(arpeggio((X+transpose(shuffle(shuffle((X+transpose(X,12) ) ) ) ,7) ) ) ,4,6) +transpose((transpose(echo(((X+transpose(X,7) ) +transpose(X,12) ) ,4,6) ,-7) +((shuffle(transpose(echo(echo(X,4,6) ,4,6) ,-7) ) +transpose(step(arpeggio(step(X,12) ) ,12) ,4) ) +transpose(((((((X|echo(X,4,6) ) +transpose(transpose(X,-7) ,12) ) +transpose((X|transpose(X,-7) ) ,4) ) +transpose(shuffle((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) +transpose(echo(((((X+transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,4) ) +transpose(((X+transpose(transpose(X,4) ,12) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,7) ) ,7) ) ) ,4) ) +transpose((((echo(X,4,6) |shuffle(X) ) +transpose((transpose(transpose((transpose(X,4) +transpose(X,12) ) ,4) ,4) +transpose(echo((step(X,12) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |step(X,12) ) ,7) ) ,4,6) ,12) ) ,4) ) +transpose(shuffle((((echo(X,4,6) +transpose(X,12) ) +transpose(X,7) ) +transpose(echo(transpose(echo(X,4,6) ,-5) ,4,6) ,12) ) ) ,7) ) ,7) ) +transpose(shuffle(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,12) ) ) ,7) ) ) ,-7) ) ,4) ) +transpose(transpose(shuffle(transpose(echo((echo(transpose(transpose(echo((transpose(X,-7) |shuffle(X) ) ,4,6) ,-5) ,-7) ,4,6) +echo(shuffle(((((echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) +transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose((echo(X,4,6) |X) ,7) ) +transpose(echo((arpeggio(X) +transpose(X,7) ) ,4,6) ,12) ) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,12) ) ) ,4,6) ) ,4,6) ,-5) ) ,-7) ,7) ) ,-5) ,12) ) random seed used was 177436689 NOTE: Generated phrase was too large ( 13840 ) , it has been truncated at 5000 notes.

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