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 16 generations the expression "X" became this:
transpose(echo(transpose(shuffle(shuffle(transpose(transpose(transpose((shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) +(echo((X+transpose(transpose(X,-5) ,7) ) ,4,6) |step((transpose(X,4) +arpeggio(X) ) ,12) ) ) ,4) ,-7) ,-5) ) ) ,-5) ,4,6) ,-7)
random seed used was 12 EXPR = step((((arpeggio(X) +(step(step(X,12) ,12) +transpose(((transpose(X,-7) +transpose(shuffle(X) ,7) ) +transpose(X,7) ) ,7) ) ) +transpose((transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) +(X+X) ) ,12) ) |transpose((arpeggio(arpeggio((((((shuffle(((((X+X) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle((X+X) ) ,7) ) ) +(transpose((X+X) ,-7) +(X+X) ) ) +transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(X,-7) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose(((((X+X) |arpeggio((X+transpose(X,12) ) ) ) +transpose(((X+transpose(X,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) +step(transpose(transpose(X,4) ,-5) ,12) ) +transpose(transpose(echo((shuffle(echo(X,4,6) ) |(shuffle(transpose(X,-7) ) +transpose(transpose(X,-7) ,7) ) ) ,4,6) ,-5) ,12) ) ) ) |(((echo((X+transpose(((transpose(X,-5) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ) ,4,6) +echo(((transpose((X|X) ,4) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) +arpeggio((X+transpose(X,7) ) ) ) ,4,6) ) |transpose(shuffle(((transpose(X,-7) +transpose(X,4) ) |(X|X) ) ) ,-7) ) |shuffle(shuffle((((X+transpose(((echo(X,4,6) +transpose(shuffle(X) ,12) ) +transpose(X,4) ) ,4) ) +transpose((transpose((X+transpose(X,7) ) ,-7) +transpose(transpose((X+X) ,-7) ,12) ) ,7) ) +transpose(transpose(arpeggio(X) ,4) ,-7) ) ) ) ) ) ,4) ) ,12)
random seed used was 0 EXPR = ((((echo((transpose(((echo((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) ,4,6) |(X+transpose(transpose((X|X) ,-7) ,7) ) ) +transpose(((transpose((X|shuffle(X) ) ,4) |arpeggio(((step(X,12) +transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ) ) +(step(transpose(X,-5) ,12) +shuffle((X|X) ) ) ) ,12) ) ,-7) +transpose(((((step(transpose(transpose(X,-7) ,4) ,12) +transpose(((X+X) +(X+transpose((X+transpose(X,12) ) ,12) ) ) ,4) ) +transpose(echo(X,4,6) ,7) ) |transpose(arpeggio((X|transpose(X,-5) ) ) ,-7) ) +transpose(transpose((shuffle((transpose(transpose((X+X) ,4) ,-7) |echo(transpose((X+transpose(X,12) ) ,4) ,4,6) ) ) |shuffle(transpose(arpeggio(X) ,-7) ) ) ,-5) ,7) ) ,7) ) ,4,6) +(transpose(shuffle((shuffle(((transpose((X|X) ,4) |echo(X,4,6) ) +transpose(((shuffle(echo(X,4,6) ) |transpose(shuffle(X) ,4) ) |((X+X) +transpose((transpose(X,4) +transpose(X,7) ) ,12) ) ) ,12) ) ) +transpose((echo(shuffle(X) ,4,6) |transpose(transpose((transpose(X,4) +X) ,-7) ,4) ) ,12) ) ) ,-5) +transpose((echo(((transpose(arpeggio(shuffle(transpose(transpose(X,-5) ,-7) ) ) ,-7) +transpose((transpose(echo((((X|(X|X) ) +(X|transpose(X,-7) ) ) +((X+transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4,6) ,-7) +((echo((X|X) ,4,6) |(transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) |echo(((X+transpose(X,12) ) +transpose(X,12) ) ,4,6) ) ) ,4) ) +transpose((transpose(transpose((X|X) ,4) ,-7) +transpose(shuffle(((X+transpose((X+X) ,4) ) +transpose(shuffle(X) ,7) ) ) ,7) ) ,7) ) ,4,6) |echo(transpose(transpose(((transpose(X,-7) +((X+transpose(X,7) ) |echo(X,4,6) ) ) +step(step(X,12) ,12) ) ,4) ,-5) ,4,6) ) ,-7) ) ) +transpose(step(shuffle((step((arpeggio(transpose(((((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) |transpose(X,4) ) +shuffle(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) ) ,-7) ) +transpose(transpose(transpose(echo(shuffle(transpose(step(X,12) ,-7) ) ,4,6) ,-5) ,-7) ,12) ) ,12) +transpose((transpose(shuffle(transpose((X+transpose(step(X,12) ,7) ) ,4) ) ,4) |((((X+X) +transpose(shuffle(X) ,7) ) +transpose(((X+transpose(((X+transpose(X,7) ) +shuffle(X) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ) ,-5) ) ) ,12) ,4) ) +transpose((((transpose((arpeggio(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |transpose(X,4) ) +((transpose(X,4) +shuffle(X) ) +shuffle((X+transpose(X,7) ) ) ) ) ) |transpose((shuffle(X) +transpose(transpose(X,-5) ,12) ) ,4) ) ,-5) |(transpose(shuffle((transpose(step(arpeggio(shuffle((X+transpose(X,-5) ) ) ) ,12) ,4) +transpose(transpose(transpose((((X+transpose((X+X) ,7) ) +transpose(X,-5) ) +arpeggio(((X+X) +transpose((X|X) ,7) ) ) ) ,-7) ,-7) ,7) ) ) ,-5) +transpose(transpose(((transpose(X,4) +transpose(transpose(X,4) ,7) ) |X) ,-5) ,12) ) ) +transpose((step(echo(((((shuffle((transpose(X,-7) |X) ) +shuffle(X) ) +((X+transpose(X,-5) ) +echo(shuffle(transpose(X,4) ) ,4,6) ) ) +transpose(transpose(((X+transpose(X,7) ) |transpose(((shuffle(X) +transpose((X+X) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) ,4) ,7) ) |(((transpose(X,-5) +transpose(arpeggio(X) ,7) ) +(transpose(transpose(shuffle(X) ,-7) ,-7) +transpose(step(arpeggio(X) ,12) ,-7) ) ) +transpose(transpose(shuffle(((X|X) +transpose(X,12) ) ) ,-5) ,7) ) ) ,4,6) ,12) +transpose(((shuffle(transpose(((X|X) +transpose(shuffle(X) ,12) ) ,-5) ) +shuffle(echo(shuffle(X) ,4,6) ) ) |echo((arpeggio(((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+X) +transpose((X|X) ,12) ) ,12) ) ,4) +transpose(transpose(X,4) ,7) ) +transpose(transpose(transpose(X,4) ,-7) ,12) ) ) +transpose(((((shuffle(X) |X) +shuffle(X) ) +(transpose(shuffle(X) ,-5) +transpose((X|(X+X) ) ,7) ) ) +transpose((transpose(step(((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ,4) +transpose(transpose(transpose(step(X,12) ,4) ,-7) ,-7) ) ,7) ) ,7) ) ,4,6) ) ,7) ) ,4) ) +transpose((((echo(arpeggio(X) ,4,6) +transpose(shuffle(X) ,4) ) +transpose(shuffle(shuffle(transpose(X,4) ) ) ,7) ) |shuffle((((transpose(X,-7) |step(X,12) ) +transpose(transpose(((X|X) +(X+X) ) ,4) ,7) ) |transpose(arpeggio(((X|X) +transpose((X+X) ,12) ) ) ,-7) ) ) ) ,7) ) ,7) ) |transpose(shuffle(shuffle(step(shuffle(transpose(((transpose(echo(X,4,6) ,-5) +(X+(X|X) ) ) |(((transpose(X,4) +transpose((echo(X,4,6) |X) ,7) ) +transpose((arpeggio(transpose(X,4) ) |(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ,4) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ) ,-5) ) ,12) ) ) ,-5) )
random seed used was 0 EXPR = transpose((transpose((((((((X+(X|X) ) +(transpose(echo(X,4,6) ,4) +transpose(echo(((X+transpose(step(X,12) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,12) ) ) +transpose(shuffle(echo(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,4,6) ) ,12) ) +transpose((((((shuffle((X+X) ) +transpose(transpose((step((X+transpose(X,7) ) ,12) +transpose(shuffle(transpose(X,-7) ) ,7) ) ,4) ,4) ) +transpose(((X+transpose((X|X) ,4) ) +transpose((transpose(X,4) +transpose(arpeggio(X) ,7) ) ,7) ) ,7) ) |echo((shuffle(X) +transpose((transpose(X,-7) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,7) ) ,4,6) ) +shuffle((transpose(transpose(transpose(X,-5) ,-7) ,-7) +transpose((transpose(X,-7) +echo(shuffle(X) ,4,6) ) ,7) ) ) ) +transpose(arpeggio(arpeggio(shuffle(transpose((X+transpose(echo(X,4,6) ,12) ) ,-5) ) ) ) ,12) ) ,4) ) +transpose(transpose(arpeggio(transpose((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(shuffle(shuffle(X) ) ,12) ) ,-5) ) ,-7) ,7) ) |transpose(transpose(((transpose(X,-7) |X) +transpose(shuffle(X) ,7) ) ,-7) ,-5) ) |(shuffle(((transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) +transpose(shuffle(arpeggio(((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) ) ) ,7) ) ) +transpose(((step((echo(X,4,6) |X) ,12) +transpose((echo(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) +shuffle(transpose(shuffle(X) ,-5) ) ) ,4) ) +transpose(transpose(((transpose(shuffle(X) ,4) +transpose(shuffle(X) ,4) ) +transpose(transpose((transpose(X,-7) +transpose((X|X) ,12) ) ,-5) ,7) ) ,-7) ,7) ) ,7) ) ) ,4) +transpose((((transpose((shuffle(((shuffle((X+X) ) +(X+shuffle(X) ) ) +transpose(shuffle((echo(X,4,6) +X) ) ,7) ) ) +transpose((shuffle((echo(X,4,6) |transpose(X,-7) ) ) +transpose(transpose(X,-5) ,4) ) ,4) ) ,4) +transpose(transpose(((((shuffle((shuffle(X) +shuffle(X) ) ) |transpose(transpose(X,4) ,-7) ) +transpose(step(transpose(shuffle(transpose(X,-5) ) ,-5) ,12) ,4) ) +transpose(step(step(transpose(transpose(X,-5) ,-5) ,12) ,12) ,7) ) +shuffle(transpose(transpose(arpeggio(step(X,12) ) ,4) ,-7) ) ) ,-5) ,12) ) +transpose(shuffle(transpose(echo(arpeggio(step(arpeggio(X) ,12) ) ,4,6) ,-7) ) ,7) ) +transpose(transpose(transpose(shuffle(transpose(((X|X) +transpose(arpeggio(X) ,7) ) ,4) ) ,-5) ,4) ,7) ) ,12) ) ,-7)
random seed used was 0

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