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 19 generations the expression "X" became this: (transpose(((transpose(arpeggio(transpose(transpose((((((arpeggio((X+transpose(X,12) ) ) +transpose(echo(transpose(arpeggio(X) ,-5) ,4,6) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) +transpose(((((step((X+transpose(X,7) ) ,12) +transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ,7) ) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose((((transpose(X,-5) +transpose(transpose(shuffle(X) ,-7) ,7) ) +transpose((((X+transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,12) ) +transpose(step(shuffle(X) ,12) ,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) |((((X+transpose(X,12) ) +X) +transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) ,7) ) +transpose(echo(X,4,6) ,7) ) ) ,4) ,-7) ) ,-5) +transpose(echo(((transpose(transpose(transpose(((transpose(X,4) +echo(transpose(echo(X,4,6) ,4) ,4,6) ) +transpose(((X+transpose(X,12) ) +(X|echo(X,4,6) ) ) ,7) ) ,-7) ,-7) ,-5) +transpose(echo(transpose(arpeggio(transpose(transpose(transpose(((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) +transpose(transpose(arpeggio(echo(X,4,6) ) ,-5) ,7) ) +transpose(echo(X,4,6) ,12) ) ,-5) ,-5) ,4) ) ,-7) ,4,6) ,4) ) +transpose((((transpose(echo(echo(X,4,6) ,4,6) ,-5) +step(((X+transpose(transpose(X,-5) ,7) ) +shuffle(transpose(X,-7) ) ) ,12) ) +arpeggio(transpose((((arpeggio(transpose(X,-7) ) +(echo(transpose(X,-7) ,4,6) +transpose(transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ,12) ) ) +transpose(shuffle((shuffle((X+transpose(X,12) ) ) +transpose(arpeggio(X) ,-5) ) ) ,4) ) +transpose(transpose((shuffle((X+transpose(X,12) ) ) +step(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) ,12) ) ,-5) ,7) ) ,-7) ) ) +transpose(transpose((arpeggio(transpose(shuffle(transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,-7) ,-5) ) ,4) ) |transpose((shuffle(arpeggio(transpose((X|transpose(X,-7) ) ,-5) ) ) +transpose(echo(arpeggio((((((X|X) +transpose(transpose(X,-7) ,12) ) +transpose(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ,4) ) +transpose(shuffle(X) ,7) ) +transpose((arpeggio(X) +transpose((transpose(X,-5) +transpose(X,12) ) ,12) ) ,12) ) ) ,4,6) ,7) ) ,4) ) ,-5) ,7) ) ,7) ) ,4,6) ,12) ) +(arpeggio(step((shuffle(transpose(((((echo(echo(X,4,6) ,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) +transpose(arpeggio(echo(X,4,6) ) ,4) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,7) ) ,-7) ) +transpose(transpose((transpose(shuffle(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) +transpose((arpeggio(transpose((X|X) ,-5) ) +transpose(transpose(((X|X) |(X|X) ) ,-5) ,12) ) ,12) ) ,-7) ,7) ) ,12) ) +transpose(step((arpeggio((arpeggio((transpose(X,-5) +(X+transpose(X,7) ) ) ) +transpose(((((arpeggio(shuffle(X) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) |((step(X,12) +transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ) +transpose(((((X+transpose(transpose(X,-7) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ,12) ) +transpose(echo(transpose(step(X,12) ,-7) ,4,6) ,7) ) ,12) ) +transpose(step((transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) +transpose((transpose(shuffle(X) ,4) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-5) ,12) ) ,7) ) ,12) ,12) ) ,7) ) ) +transpose(((shuffle(echo((((transpose(transpose((transpose(X,-5) +transpose(X,7) ) ,-7) ,-5) +transpose(transpose((X|X) ,4) ,4) ) +transpose(transpose(transpose(((transpose(X,-7) +transpose((X|X) ,7) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,7) ) ,-7) ,-7) ,7) ) +transpose(transpose(((arpeggio((X+transpose(X,7) ) ) +transpose((X|arpeggio(shuffle(X) ) ) ,12) ) |step(X,12) ) ,-7) ,12) ) ,4,6) ) +transpose((transpose((transpose(transpose(transpose(X,-7) ,-7) ,-5) +transpose(echo(transpose(transpose(arpeggio(X) ,4) ,-7) ,4,6) ,12) ) ,-5) |((transpose(transpose(step(shuffle(X) ,12) ,4) ,-7) +transpose(step(step(X,12) ,12) ,4) ) +transpose(shuffle(step(transpose((X+transpose(X,12) ) ,-7) ,12) ) ,7) ) ) ,4) ) +transpose(((step(((shuffle(X) +transpose(arpeggio(X) ,7) ) |arpeggio(X) ) ,12) +transpose((transpose(echo(transpose(X,4) ,4,6) ,-5) +transpose(transpose(((echo(shuffle(X) ,4,6) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(X,-7) ,12) ) ,4) ,12) ) ,7) ) +transpose(transpose(step(echo(((step(((step(X,12) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ,12) ,-5) ,-5) ) ,7) ) ,12) ) ,12) ,12) ) ) ,-7) +transpose((((((transpose(step(step((transpose((((X+transpose(X,12) ) +transpose(X,7) ) +step(X,12) ) ,-5) |echo(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ,4,6) ) ,12) ,12) ,-5) +transpose(shuffle(transpose(echo((transpose(transpose(((transpose(X,-5) |transpose(X,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,-5) ,-7) +transpose((transpose(transpose(((X+transpose(transpose(X,-5) ,7) ) +((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ,-7) ,4) +transpose(transpose(transpose(((transpose(transpose(X,-7) ,-5) +transpose(transpose(X,4) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,-7) ,-5) ,12) ) ,-7) ) ,4,6) ,-5) ) ,7) ) +transpose(step(transpose((echo((((((((echo(X,4,6) +transpose(step(X,12) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) +transpose(((transpose(transpose(X,-7) ,4) +transpose(echo(transpose(transpose(X,-7) ,4) ,4,6) ,4) ) +transpose((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,4) ) +transpose(transpose(step(arpeggio(transpose(transpose(X,-7) ,-7) ) ,12) ,-5) ,7) ) +transpose(step(arpeggio(transpose(step(X,12) ,-5) ) ,12) ,4) ) +transpose((transpose(echo(X,4,6) ,-5) +transpose(((arpeggio(((step(X,12) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ) +transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,7) ) +transpose(step(((transpose(((transpose(X,-5) +transpose(((shuffle(X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,-7) +transpose(step((X+transpose(transpose(X,-7) ,7) ) ,12) ,7) ) +transpose(transpose(arpeggio(transpose(X,-5) ) ,4) ,12) ) ,12) ,7) ) ,4,6) +transpose(transpose(step(transpose(transpose(transpose(step(((echo(X,4,6) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,12) ,-7) ,-5) ,-5) ,12) ,-5) ,7) ) ,-5) ,12) ,7) ) +transpose((((shuffle(transpose(arpeggio((transpose(transpose(X,-7) ,-7) +transpose((((((((transpose(step(X,12) ,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(transpose((X+transpose(X,7) ) ,-7) ) ,4) ) +transpose((arpeggio((X+X) ) +transpose((echo(X,4,6) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,7) ) +transpose((step(shuffle(transpose(X,-5) ) ,12) +transpose((((transpose(X,-5) |transpose(X,4) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose((transpose(X,-5) +transpose((X|X) ,12) ) ,-7) ,4) ) +transpose((shuffle(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ) +transpose((transpose((X+X) ,-7) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,7) ) ,7) ) ,7) ) ,12) ) ) ,-7) ) +transpose(shuffle(transpose(((((transpose(X,-5) +transpose(X,12) ) +transpose((X|X) ,-5) ) +transpose(shuffle(transpose(transpose(X,-7) ,4) ) ,-7) ) +transpose((((X+transpose(shuffle(((X+transpose(X,7) ) +transpose(step(X,12) ,12) ) ) ,7) ) +transpose(((transpose(arpeggio(X) ,-5) +transpose((X|shuffle(X) ) ,4) ) +transpose(echo(((X+transpose(X,12) ) +X) ,4,6) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) ,-5) ) ,7) ) +transpose(transpose(transpose((((echo(echo((X+transpose(X,12) ) ,4,6) ,4,6) +transpose(((((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose(X,4) ,12) ) +transpose(((transpose(X,4) +transpose(transpose(X,-5) ,7) ) +shuffle((X|X) ) ) ,4) ) +transpose(shuffle((shuffle(X) +transpose((X|X) ,7) ) ) ,7) ) ,7) ) +transpose((shuffle(transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +echo(X,4,6) ) ,4,6) ,4) ) +transpose(echo(transpose(transpose(X,4) ,-5) ,4,6) ,12) ) ,4) ) +transpose(step(shuffle(((transpose(X,-7) |transpose(transpose(X,4) ,-7) ) |transpose(X,-5) ) ) ,12) ,7) ) ,-5) ,-7) ,4) ) +transpose(transpose(transpose((((arpeggio(X) +transpose(step((X+transpose(X,12) ) ,12) ,12) ) +transpose((transpose(transpose(shuffle(X) ,-5) ,-5) |transpose((X+transpose(X,7) ) ,-5) ) ,12) ) +transpose(shuffle(shuffle(transpose((arpeggio(X) |(echo(echo(X,4,6) ,4,6) |X) ) ,4) ) ) ,7) ) ,-7) ,4) ,7) ) ,12) ) +transpose(step(echo(echo(echo(transpose((transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ,-5) ,4,6) ,4,6) ,4,6) ,12) ,12) ) |shuffle(shuffle((echo(shuffle(((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ,4,6) +transpose(transpose(((echo(((X+transpose((X+transpose(X,7) ) ,7) ) +transpose((X+transpose((X+X) ,12) ) ,12) ) ,4,6) +transpose((((X+transpose((X+transpose(X,12) ) ,12) ) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose((X+transpose(echo(X,4,6) ,7) ) ,7) ) ,12) ) +transpose((((transpose(transpose(X,-7) ,-5) |transpose(arpeggio(X) ,-5) ) +transpose((((transpose(step(((X|X) +transpose(X,7) ) ,12) ,-5) +transpose(step(shuffle(X) ,12) ,12) ) +transpose(((shuffle(transpose((X+transpose(X,7) ) ,-7) ) +transpose(((X+X) |((step(X,12) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,12) ) +transpose(transpose(shuffle((((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ) ,4) ,7) ) ,4) ) +transpose((transpose((transpose(step(X,12) ,-7) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) ,-5) +transpose(((transpose(shuffle(X) ,4) +transpose(shuffle(X) ,7) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,7) ) ,7) ) ,7) ) ,12) ) ,-5) ,7) ) ) ) ) ,12) ) random seed used was 70810885

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