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:
Phrase for X:
# of Tracks:
Randomize patches:
 

Results may not appear for a few seconds.
Be patient!
Do you like this result? Do you want to let other people listen to it?

Save this one in the
Tune Trove!


See what's already
in the Tune Trove!

After 20 generations the expression "X" became this:
(((transpose(((shuffle(((transpose(transpose((((((step(transpose(transpose(X,4) ,-7) ,12) +transpose(shuffle(((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +X) ) +transpose(shuffle(shuffle((X+transpose(X,12) ) ) ) ,4) ) +transpose(step(X,12) ,7) ) ) ,4) ) +transpose(X,7) ) +transpose(step(echo(X,4,6) ,12) ,4) ) +transpose(((step(X,12) +shuffle(X) ) +transpose(step(arpeggio((X|X) ) ,12) ,7) ) ,7) ) +transpose(arpeggio(arpeggio(transpose(arpeggio(shuffle(X) ) ,4) ) ) ,12) ) ,-7) ,4) |transpose(step(((step(transpose(step(arpeggio((X+(X+X) ) ) ,12) ,4) ,12) +transpose((((((((((X|X) +transpose(transpose(X,4) ,12) ) +transpose(X,4) ) +transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) +transpose(transpose((shuffle(transpose(echo(X,4,6) ,4) ) +(X+transpose(X,12) ) ) ,4) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) +transpose(shuffle(((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) +transpose(X,4) ) +transpose((arpeggio((X+transpose(X,12) ) ) +transpose(step(X,12) ,12) ) ,7) ) ) ,12) ) +transpose(transpose((transpose(X,-7) |((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) ) ,-7) ,7) ) ,4) ) +transpose(transpose(transpose(transpose(shuffle(X) ,-7) ,-7) ,-7) ,7) ) ,12) ,4) ) +transpose(echo((((step((transpose(echo((((X+transpose(X,12) ) +transpose((transpose(transpose(X,4) ,-7) +transpose((transpose(X,-7) +transpose((X+X) ,12) ) ,12) ) ,4) ) +transpose((echo((X+transpose(X,7) ) ,4,6) |X) ,7) ) ,4,6) ,-7) |transpose(echo((((X+transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(X,-7) ,-7) ) ,4,6) ,-7) ) ,12) +transpose(step((echo(transpose(transpose(transpose(X,-5) ,-7) ,-7) ,4,6) +transpose(echo(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X+(arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,7) ) ,4,6) ,12) ) ,12) ,4) ) +transpose(echo(((((X+shuffle(X) ) +transpose(X,7) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose(transpose((X+X) ,4) ,7) ) ,12) ) +transpose(transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ,12) ) ,4,6) ,7) ) +transpose(((echo(step((X|X) ,12) ,4,6) +transpose(arpeggio(transpose((X|X) ,4) ) ,12) ) +transpose(transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(step((X|X) ,12) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,4) ,-7) ) ,-7) ) ,4,6) ,12) ) ) +transpose(shuffle(transpose(transpose(((((((shuffle((X+transpose(transpose(X,-7) ,12) ) ) +transpose(((transpose(X,4) +transpose(step(X,12) ,12) ) +transpose((echo(X,4,6) |(X+transpose(X,7) ) ) ,12) ) ,12) ) +transpose((transpose(((arpeggio((X+transpose(X,12) ) ) +transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) +transpose(transpose((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) ,-5) ,7) ) ,-7) +transpose(echo((echo(transpose((X+transpose(X,7) ) ,4) ,4,6) +transpose(shuffle(echo(X,4,6) ) ,12) ) ,4,6) ,7) ) ,12) ) +transpose((transpose(transpose(((transpose(X,4) +transpose(((transpose(transpose(X,-7) ,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ,4) ) +transpose((X|X) ,7) ) ,-7) ,-7) +transpose(transpose(transpose(((X+X) +(X+transpose(X,12) ) ) ,-5) ,-5) ,7) ) ,12) ) +transpose((step(echo((X+transpose(transpose(X,-5) ,7) ) ,4,6) ,12) +transpose((((shuffle(step((X+transpose(X,12) ) ,12) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) +transpose(transpose(transpose(transpose(transpose(X,4) ,4) ,-7) ,4) ,4) ) +transpose(arpeggio(echo((((X+transpose((X|X) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(X,7) ) ,4,6) ) ,7) ) ,7) ) ,12) ) +transpose((step((((transpose(echo(X,4,6) ,4) +transpose(echo(echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) ,4,6) ,4) ) +transpose(shuffle(((X+transpose(X,7) ) |step(X,12) ) ) ,7) ) +transpose(step((step(X,12) +transpose(arpeggio((X+X) ) ,12) ) ,12) ,12) ) ,12) +transpose((((transpose(arpeggio(((X+transpose(X,12) ) +transpose(step(X,12) ,12) ) ) ,-7) +transpose(transpose(transpose(arpeggio(X) ,4) ,-5) ,4) ) +transpose(echo(transpose(step((X+transpose(X,7) ) ,12) ,4) ,4,6) ,7) ) +((transpose(step((((echo(X,4,6) |transpose(X,-7) ) +transpose(shuffle(arpeggio(X) ) ,7) ) |step(shuffle(X) ,12) ) ,12) ,-7) +transpose(transpose((transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) +transpose(echo((transpose(X,-7) +transpose((X|X) ,7) ) ,4,6) ,12) ) ,-5) ,4) ) +transpose(((((arpeggio(shuffle(arpeggio(X) ) ) +transpose(transpose(((X+X) +transpose(echo(X,4,6) ,7) ) ,4) ,4) ) +transpose(step(step(transpose(X,-5) ,12) ,12) ,7) ) +transpose(step((((X+transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(X,4) ) ,12) ,4) ) +transpose((transpose((X|X) ,-7) +transpose(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) +transpose(((X+X) +transpose(transpose(X,4) ,12) ) ,7) ) ,7) ) ,7) ) ,7) ) ) ,12) ) ,4) ) +transpose(((transpose((X+transpose(X,7) ) ,-5) +transpose(transpose((step(X,12) |(X+transpose((X+X) ,12) ) ) ,-7) ,4) ) +transpose((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) ,7) ) ,7) ) ,-7) ,-7) ) ,4) ) +transpose(step(step(((transpose(((((step(((echo(echo(X,4,6) ,4,6) +transpose(echo(X,4,6) ,12) ) +transpose(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,12) +transpose(transpose(arpeggio(step(X,12) ) ,-7) ,4) ) +transpose(step(transpose((X|X) ,-7) ,12) ,7) ) +transpose(transpose(shuffle(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,4) ,12) ) +transpose(step(((step(((step(X,12) +X) +transpose(X,7) ) ,12) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(arpeggio(X) ,7) ) ) +(echo(shuffle((X+transpose(X,7) ) ) ,4,6) |transpose(X,-7) ) ) ,12) ,7) ) ,4) +echo(((echo(echo(((echo(X,4,6) +transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,4,6) +transpose(transpose(((echo(transpose(X,4) ,4,6) +(X+transpose(X,12) ) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,-5) ,7) ) +transpose(((step(((X+transpose(step(X,12) ,7) ) +transpose((transpose(X,4) +transpose((X+X) ,7) ) ,7) ) ,12) +transpose(transpose((transpose(X,-7) +step((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,4) ,4) ) +transpose(echo(((((X+transpose(X,12) ) +transpose(X,-7) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) ,4,6) ,7) ) ,12) ) ,4,6) ) +transpose(echo((transpose(((X+transpose((X|X) ,12) ) +transpose((transpose(step((X+transpose(X,7) ) ,12) ,-7) +transpose(arpeggio(((((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ) ,12) ) ,7) ) ,-7) +transpose(transpose(arpeggio((transpose(X,-7) |transpose(X,4) ) ) ,4) ,-7) ) ,4,6) ,12) ) ,12) ,12) ,7) ) ,-7) +transpose(arpeggio(shuffle(echo((shuffle(arpeggio(step((step(arpeggio((X+transpose(arpeggio(arpeggio(X) ) ,7) ) ) ,12) +transpose(((transpose(X,-7) +transpose(arpeggio(X) ,7) ) +transpose(transpose((arpeggio(X) +transpose(echo(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,12) ) ,-7) ,12) ) ,7) ) ,12) ) ) +transpose(transpose(arpeggio(arpeggio(((transpose(arpeggio(X) ,-7) +transpose(((echo(X,4,6) +transpose(echo((transpose(X,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,4) ) +transpose((arpeggio(X) +transpose(((X+transpose(X,12) ) |echo(X,4,6) ) ,12) ) ,7) ) ,12) ) |(step(transpose(echo(X,4,6) ,-7) ,12) +transpose(transpose((X|X) ,-5) ,-5) ) ) ) ) ,-7) ,7) ) ,4,6) ) ) ,4) ) +transpose(transpose(echo(arpeggio(transpose((transpose((transpose((X+X) ,-5) +transpose(transpose(step(X,12) ,-7) ,7) ) ,-7) +transpose(echo(((arpeggio(transpose((echo((X+transpose(X,7) ) ,4,6) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,-5) ) |(arpeggio(transpose(transpose((X+transpose(X,7) ) ,4) ,-7) ) +(step(X,12) +transpose(transpose(transpose(X,-5) ,4) ,12) ) ) ) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ,4,6) ,7) ) ,4) ) ,4,6) ,-7) ,7) ) +transpose((arpeggio(transpose(echo(echo(echo(((echo(echo(shuffle(X) ,4,6) ,4,6) +transpose((((step(X,12) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) +transpose(shuffle(transpose(echo(transpose(X,-7) ,4,6) ,-7) ) ,12) ) ,4) ) +transpose(((step(((shuffle(arpeggio(X) ) +transpose((X+(step(X,12) |X) ) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,12) +transpose((X+shuffle(X) ) ,12) ) |transpose(step((X+transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ,12) ,4) ) ,7) ) ,4,6) ,4,6) ,4,6) ,-7) ) +transpose(((transpose(((((arpeggio((transpose(((((arpeggio(X) +transpose(arpeggio(X) ,7) ) +transpose((transpose(X,-7) +transpose((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose((transpose(X,4) +transpose(X,7) ) ,7) ) +transpose(echo(shuffle((shuffle(shuffle((X+transpose(X,12) ) ) ) +transpose((step(shuffle(X) ,12) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) ,12) ) ,7) ) ) ,4,6) ,7) ) ,-7) +transpose((step(((((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(shuffle(transpose(X,-7) ) ,12) ) +transpose(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-7) ,4) ) +transpose(shuffle(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(transpose(X,-5) ,12) ) ,-7) ) ,7) ) ,12) +transpose(arpeggio(((shuffle(shuffle(transpose(((X+transpose(X,12) ) +X) ,-5) ) ) +transpose(((X+transpose(((X+X) +transpose(X,12) ) ,12) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,12) ) ,4) ) +transpose(transpose(transpose(((X+transpose(X,12) ) +transpose(step(X,12) ,12) ) ,4) ,-7) ,7) ) ) ,12) ) ,7) ) ) +transpose(transpose(transpose(transpose(((transpose(step(shuffle(echo(X,4,6) ) ,12) ,-7) +transpose(step(arpeggio(((step(X,12) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) ) ,12) ,12) ) +transpose(transpose((transpose(arpeggio(transpose(X,-7) ) ,-7) +transpose(transpose(X,-7) ,12) ) ,-7) ,7) ) ,-7) ,4) ,-7) ,4) ) +transpose(step((echo((echo((step(X,12) +transpose(X,7) ) ,4,6) |((((((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(X,12) ) |arpeggio(X) ) +transpose((step((X+transpose(X,7) ) ,12) +transpose(X,-7) ) ,4) ) +transpose(transpose((X+arpeggio(X) ) ,4) ,7) ) ) ,4,6) +transpose(((transpose(echo(transpose(X,4) ,4,6) ,-5) +transpose(arpeggio(transpose(X,-7) ) ,7) ) +shuffle(((((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) +transpose(step(echo(step((X+transpose(X,7) ) ,12) ,4,6) ,12) ,12) ) ) ) ,7) ) ,12) ,7) ) +transpose(((transpose(shuffle(((transpose(echo(X,4,6) ,-5) +transpose(echo(((echo(((X+transpose(X,7) ) +transpose(X,12) ) ,4,6) +transpose(X,4) ) +transpose(transpose(arpeggio(arpeggio(X) ) ,4) ,7) ) ,4,6) ,4) ) +transpose((echo((X+(X+transpose(X,12) ) ) ,4,6) +transpose((transpose(step(X,12) ,-7) +transpose(arpeggio(X) ,12) ) ,12) ) ,7) ) ) ,-7) +transpose(arpeggio(((((transpose(arpeggio(step(shuffle(X) ,12) ) ,-7) |((transpose(echo(echo(X,4,6) ,4,6) ,-7) +transpose((X|step(step(X,12) ,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ) +transpose((shuffle(shuffle(X) ) +transpose((echo(echo(X,4,6) ,4,6) +transpose(echo((X+X) ,4,6) ,12) ) ,12) ) ,12) ) +transpose(transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,-5) ,4) ,4) ) +transpose(arpeggio(((transpose(X,4) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(arpeggio(X) ,12) ) ,12) ) +transpose(transpose((X+transpose(transpose(X,-7) ,12) ) ,-7) ,7) ) ) ,7) ) ) ,4) ) +transpose(arpeggio((transpose(transpose(echo(transpose(X,-7) ,4,6) ,-7) ,4) +((transpose(((step(X,12) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,-7) +transpose(transpose(step((echo(X,4,6) +transpose(X,7) ) ,12) ,-7) ,4) ) +transpose((transpose(X,-7) |step((X+X) ,12) ) ,7) ) ) ) ,7) ) ,4) ) +transpose(echo(transpose(transpose(((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(transpose(((((X+X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) +(X|echo(X,4,6) ) ) ,-5) ,4) ,4) ) +transpose(((echo(arpeggio(X) ,4,6) |step((shuffle(X) +echo(X,4,6) ) ,12) ) |(((transpose(X,4) +transpose(echo(X,4,6) ,7) ) +transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose(transpose(arpeggio(transpose(echo(X,4,6) ,-7) ) ,4) ,7) ) ) ,7) ) ,-7) ,-7) ,4,6) ,7) ) ,-7) +transpose(echo(shuffle(arpeggio(transpose((((step(step((X+transpose(X,12) ) ,12) ,12) +transpose((transpose(echo(X,4,6) ,-7) +(shuffle((X+transpose(X,7) ) ) +transpose((step(X,12) +shuffle(X) ) ,12) ) ) ,7) ) +transpose(transpose(shuffle(transpose(echo(echo(X,4,6) ,4,6) ,-7) ) ,-5) ,4) ) +transpose(((((arpeggio(arpeggio(X) ) |echo(((arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,4,6) ) +transpose(arpeggio(step(((X+transpose(X,7) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(arpeggio(shuffle((X+transpose(X,7) ) ) ) ,7) ) +transpose((shuffle((((transpose(X,-7) +transpose(arpeggio(X) ,4) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) +transpose(echo(step(shuffle((X+transpose(X,12) ) ) ,12) ,4,6) ,12) ) ) +transpose(((arpeggio((X+X) ) |transpose((X+transpose(transpose(X,-7) ,12) ) ,-7) ) |transpose(arpeggio(step(((X+X) +(X|X) ) ,12) ) ,-7) ) ,12) ) ,12) ) ,7) ) ,4) ) ) ,4,6) ,12) ) +transpose(shuffle(transpose((shuffle((echo((X|X) ,4,6) |((((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) +transpose(step((X+transpose(X,7) ) ,12) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) ) +transpose(transpose(((echo(transpose(shuffle(echo((X+transpose((X+transpose(X,7) ) ,12) ) ,4,6) ) ,-7) ,4,6) +transpose(step(transpose(X,-7) ,12) ,4) ) +transpose(transpose(transpose((transpose(X,-5) +transpose(X,7) ) ,4) ,-7) ,7) ) ,-7) ,12) ) ,-7) ) ,7) ) ,12) ) ,4) )
random seed used was 62942926

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