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 16 generations the expression "X" became this: step(((((((shuffle((X+transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) ) +transpose((((((((((X+transpose(X,12) ) +transpose((X|X) ,7) ) +echo(echo(X,4,6) ,4,6) ) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(arpeggio((step(X,12) |transpose((X+transpose(X,12) ) ,-7) ) ) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose(((X+transpose(X,12) ) +echo(X,4,6) ) ,7) ) ,4) ) +transpose(((X+transpose(echo(X,4,6) ,7) ) +transpose((X+X) ,7) ) ,7) ) +transpose(arpeggio(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) +transpose(step(((step((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ,12) ) ,12) ) +shuffle(echo(shuffle(((step(X,12) +transpose(echo(X,4,6) ,4) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ) ,4,6) ) ) +transpose(echo((((((((step(transpose(X,4) ,12) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) |(step(((X+transpose(X,7) ) +transpose((X|X) ,7) ) ,12) |echo((X+transpose(X,12) ) ,4,6) ) ) +transpose(shuffle(echo((arpeggio(arpeggio((X+transpose(X,7) ) ) ) |step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ) ,4) ) +transpose(echo(((((echo(X,4,6) +transpose(arpeggio(X) ,12) ) +transpose(step(shuffle(transpose(X,-5) ) ,12) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) +arpeggio(transpose(step((X+transpose(X,12) ) ,12) ,4) ) ) ,4,6) ,7) ) +transpose((((echo(echo((step(shuffle(X) ,12) +transpose(echo(X,4,6) ,12) ) ,4,6) ,4,6) |arpeggio((arpeggio(arpeggio((X+transpose(X,7) ) ) ) |shuffle((X+transpose((X+transpose(X,7) ) ,12) ) ) ) ) ) +transpose(arpeggio(step((transpose(X,-5) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,12) ) ,12) ) +transpose(((step((shuffle(X) +(X|X) ) ,12) |transpose(step(step(X,12) ,12) ,4) ) +(echo(((X|X) +transpose(arpeggio(X) ,7) ) ,4,6) +transpose(transpose(shuffle(step(X,12) ) ,-7) ,12) ) ) ,7) ) ,4) ) +transpose(step((step(((X+transpose((X+X) ,12) ) +transpose((echo(shuffle(X) ,4,6) +X) ,7) ) ,12) +transpose(((arpeggio(step(shuffle(X) ,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,12) ) ) +transpose((arpeggio(transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ,12) ) ,12) ) +transpose(transpose(arpeggio((transpose(shuffle(X) ,-7) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ) ,-5) ,7) ) ,7) ) ,12) ,7) ) ,4,6) ,4) ) +transpose((((transpose(arpeggio((((X+transpose(transpose(X,-5) ,12) ) +(echo((X+transpose(X,12) ) ,4,6) +transpose(arpeggio(step(X,12) ) ,7) ) ) +transpose((step((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) +((X+transpose(arpeggio((X+transpose(X,7) ) ) ,4) ) +transpose((X+X) ,7) ) ) ,12) +transpose(arpeggio(transpose(((X+X) +transpose(((X+transpose(X,12) ) +transpose((X|X) ,7) ) ,12) ) ,-5) ) ,12) ) ,7) ) ) ,-7) |arpeggio(shuffle(step((X+step(X,12) ) ,12) ) ) ) +transpose((transpose((((transpose(X,4) |((X+transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +arpeggio(X) ) +transpose(((transpose((X+transpose(X,12) ) ,-5) +transpose(X,4) ) +transpose(echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) ,7) ) ,7) ) ,4) +transpose(((transpose(((step((X+transpose(X,12) ) ,12) +transpose(((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,-5) +transpose((((X+transpose(X,12) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose((transpose((((X+transpose(X,12) ) |arpeggio(X) ) +transpose((X+X) ,12) ) ,-7) +transpose(step((X+X) ,12) ,-5) ) ,7) ) ,7) ) ,4) ) +transpose((arpeggio(transpose((((step(step(X,12) ,12) +transpose(echo(X,4,6) ,7) ) +transpose(((X+transpose(X,12) ) +((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) +transpose(shuffle(arpeggio(arpeggio(X) ) ) ,7) ) ,-5) ) +transpose((step(X,12) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ,12) ) ,7) ) ,7) ) +transpose(step(transpose(arpeggio(X) ,4) ,12) ,7) ) |(arpeggio(shuffle(step(step(((step(transpose(shuffle(shuffle(X) ) ,4) ,12) +transpose(step(((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose((echo(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) ,-7) ,4,6) +transpose(((transpose(X,-7) +X) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ,7) ) ,7) ) ,12) ,12) ) ) |transpose(echo(((((shuffle(((((echo(arpeggio(X) ,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((((shuffle(X) +transpose(((X|X) +transpose((X+X) ,7) ) ,7) ) +transpose(step((X|(X+transpose(X,12) ) ) ,12) ,4) ) +transpose((transpose((X+transpose(X,7) ) ,-5) +transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,7) ) ,7) ) +transpose(arpeggio(((X+transpose(transpose(X,4) ,7) ) +transpose(transpose(X,-7) ,12) ) ) ,4) ) +transpose((((echo(X,4,6) |X) +transpose((transpose(transpose(X,-7) ,-5) +transpose(((X+X) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,7) ) ,4) ) +transpose(((transpose(X,-7) +transpose(arpeggio((X|X) ) ,4) ) +transpose((X|X) ,7) ) ,7) ) ,7) ) ) +transpose((transpose(transpose(transpose(step(shuffle(shuffle(X) ) ,12) ,-5) ,4) ,4) +transpose((echo((X+transpose(X,12) ) ,4,6) +transpose(step(arpeggio(arpeggio(X) ) ,12) ,-7) ) ,7) ) ,12) ) +transpose(echo(step(((transpose(X,4) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,12) ,4,6) ,4) ) +transpose((((transpose(arpeggio(echo(transpose(X,-7) ,4,6) ) ,-7) +transpose(((((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) +transpose((arpeggio(X) +transpose((X+X) ,7) ) ,7) ) ,4) ) +transpose(echo(transpose(((transpose(X,-5) +transpose(X,4) ) +transpose((X+X) ,7) ) ,4) ,4,6) ,7) ) +transpose((((shuffle(shuffle(echo(echo(X,4,6) ,4,6) ) ) +transpose((echo((((X+X) +transpose((X+transpose(X,7) ) ,7) ) |(transpose(X,-5) +transpose(step(X,12) ,12) ) ) ,4,6) +transpose(step((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) ,12) ,7) ) ,4) ) +transpose(arpeggio(shuffle(((X+transpose(X,12) ) +transpose(X,12) ) ) ) ,7) ) +transpose(transpose(arpeggio(transpose((((X+transpose(arpeggio(X) ,7) ) +transpose(X,4) ) +transpose((X|(X+transpose(X,7) ) ) ,7) ) ,-7) ) ,4) ,7) ) ,12) ) ,7) ) +transpose(arpeggio(shuffle(((shuffle(transpose(echo((X+X) ,4,6) ,-5) ) +(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) +transpose(X,-7) ) ) |((((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) |arpeggio(X) ) |transpose((transpose(X,4) |X) ,4) ) +transpose(((((transpose(X,4) +transpose(X,12) ) |(X+transpose(transpose(transpose(X,-5) ,4) ,7) ) ) +transpose(echo((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,4) ) +transpose(step(transpose(transpose(X,4) ,-7) ,12) ,7) ) ,4) ) +transpose(shuffle(shuffle(echo(arpeggio(X) ,4,6) ) ) ,7) ) ) ) ) ,12) ) ,4,6) ,-7) ) ) ,12) random seed used was 9 NOTE: Generated phrase was too large ( 12592 ) , it has been truncated at 5000 notes. EXPR = shuffle(transpose((arpeggio((((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) +transpose((((echo(transpose(X,4) ,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose(((transpose(X,-5) |arpeggio(X) ) +transpose(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-5) ,12) ) ,7) ) +transpose(transpose((((X+transpose(X,7) ) |transpose(X,4) ) +(X|X) ) ,4) ,12) ) ,4) ) +transpose((((((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) |(transpose(X,-5) +transpose(X,7) ) ) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,12) ) |(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(X,12) ) ) ,7) ) ) |transpose(step(arpeggio(echo((transpose((transpose(X,4) +transpose(echo(X,4,6) ,12) ) ,-5) +transpose(shuffle(((X+transpose(X,12) ) +transpose(X,7) ) ) ,7) ) ,4,6) ) ,12) ,4) ) ,-7) ) random seed used was 0

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