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(((transpose(step(transpose(((((transpose((transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ) ,-7) +transpose((transpose(((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(((step(X,12) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,4) +transpose(echo(step((echo(transpose(X,4) ,4,6) +(transpose(transpose(X,-7) ,-5) +transpose(shuffle(arpeggio(X) ) ,7) ) ) ,12) ,4,6) ,7) ) ,12) ) ,-5) +transpose((((echo(shuffle(step(shuffle(echo(transpose(transpose(X,-5) ,4) ,4,6) ) ,12) ) ,4,6) +transpose((((transpose((((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) +transpose(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,-5) +transpose(((X|X) +transpose(X,4) ) ,-7) ) |transpose(arpeggio(shuffle((step(X,12) +transpose(transpose(X,4) ,12) ) ) ) ,-5) ) +transpose(echo(echo(step(transpose(step((X+transpose(X,7) ) ,12) ,-5) ,12) ,4,6) ,4,6) ,7) ) ,4) ) +transpose(transpose((transpose(((transpose(X,4) |transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) ) +transpose((transpose((X|X) ,4) +transpose((step(X,12) +transpose(X,-5) ) ,7) ) ,12) ) ,-5) +transpose(echo(transpose(arpeggio(X) ,-5) ,4,6) ,7) ) ,-5) ,7) ) +transpose(echo(echo(transpose(arpeggio(echo(transpose(arpeggio(X) ,4) ,4,6) ) ,4) ,4,6) ,4,6) ,7) ) ,4) ) +transpose((((((step(X,12) +transpose((transpose((X+X) ,4) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) |transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,-7) ) +transpose((((transpose((X|(X+transpose(X,12) ) ) ,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((transpose(X,-5) +transpose(echo(X,4,6) ,4) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ,7) ) +transpose((transpose(X,-5) +(X+transpose(transpose(X,4) ,7) ) ) ,-7) ) ,7) ) +transpose(echo(step(shuffle(transpose(step(transpose((X+X) ,4) ,12) ,4) ) ,12) ,4,6) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose(echo(arpeggio((transpose(transpose(X,-7) ,-7) +transpose((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) ,7) ) ) ,4,6) ,12) ) ,7) ) ,7) ) +transpose(transpose(step(((transpose(step((transpose(transpose(((((X+X) +transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,12) ) ,4) ,4) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ,12) ,4) +transpose(((transpose((shuffle(transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose((transpose(arpeggio(step(X,12) ) ,4) +shuffle(transpose(transpose(X,-7) ,-5) ) ) ,7) ) ,-5) +transpose(transpose(transpose((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,-7) ,4) ) +transpose(shuffle((step((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) |transpose((echo(X,4,6) +transpose(echo(X,4,6) ,12) ) ,4) ) ) ,7) ) ,4) ) +transpose(transpose(echo(step(X,12) ,4,6) ,4) ,7) ) ,12) ,4) ,7) ) +transpose(arpeggio((((shuffle((((X+transpose((echo(X,4,6) |arpeggio(X) ) ,4) ) +transpose(X,7) ) +transpose(((X+transpose(transpose(X,-5) ,7) ) |transpose((X+X) ,4) ) ,12) ) ) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose((step(transpose(transpose(step(X,12) ,4) ,-5) ,12) +transpose((((X+transpose(X,12) ) +transpose(step(X,12) ,7) ) +transpose(transpose(((X+transpose(X,12) ) +X) ,-7) ,12) ) ,12) ) ,7) ) +transpose(((transpose((transpose(((X+transpose(X,12) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,-5) +transpose(step(transpose(X,-7) ,12) ,12) ) ,-7) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(echo((step(transpose(X,4) ,12) |shuffle(transpose(transpose(X,-7) ,4) ) ) ,4,6) ,7) ) ,7) ) ) ,7) ) ,-5) ,12) ,-7) +transpose(shuffle(step(transpose(((arpeggio((((echo(transpose((transpose(transpose(arpeggio(X) ,-7) ,-5) +transpose(((X+transpose(echo(X,4,6) ,7) ) +transpose((transpose(X,-7) +X) ,7) ) ,7) ) ,-5) ,4,6) +transpose((((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) +shuffle((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose((((X+transpose(X,12) ) |X) +transpose((step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,12) ) ,4) ,12) ) ,7) ) +transpose(arpeggio(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step((X|X) ,12) ,7) ) ,-7) ,4) ) ,4) ) +transpose((((((transpose(((transpose(transpose(X,4) ,-7) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) +(transpose(X,-5) +transpose(transpose(X,-7) ,7) ) ) +transpose(transpose(step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,4) ,4) ) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,12) ) ,-7) +(transpose((X+step(X,12) ) ,-5) +transpose(transpose(echo(echo(X,4,6) ,4,6) ,4) ,7) ) ) ,7) ) +transpose(echo((transpose(arpeggio((X+transpose(X,12) ) ) ,-5) +transpose((arpeggio(transpose(X,-5) ) +transpose(shuffle(arpeggio((X|X) ) ) ,12) ) ,12) ) ,4,6) ,4) ) +transpose(transpose(((transpose((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) ,4) +transpose(transpose(((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,4) ) +transpose(transpose(transpose(transpose(arpeggio(X) ,-5) ,4) ,4) ,7) ) ,4) ,7) ) ,7) ) ) +transpose((step(((((transpose(echo(echo(transpose(X,-5) ,4,6) ,4,6) ,-5) +transpose(X,-7) ) |transpose(echo((transpose(X,-5) +transpose(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,-5) ) +transpose(transpose(transpose(transpose(arpeggio(transpose((X+transpose(X,12) ) ,-5) ) ,4) ,4) ,-5) ,4) ) +transpose(transpose(((transpose(((step(X,12) +transpose(shuffle(X) ,7) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,12) ) ,-5) +transpose((transpose(arpeggio(X) ,4) +transpose(step(step(transpose(X,-5) ,12) ,12) ,12) ) ,4) ) +transpose(shuffle(step((X+transpose(X,12) ) ,12) ) ,7) ) ,4) ,7) ) ,12) +transpose(step(transpose(transpose(shuffle(transpose((X+transpose(transpose(X,-7) ,7) ) ,-5) ) ,4) ,4) ,12) ,12) ) ,12) ) +transpose(transpose(transpose(arpeggio(shuffle((((((shuffle((((transpose(transpose(X,-5) ,-5) +transpose(((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(X,7) ) ) +transpose(echo((((step(X,12) |X) +transpose(arpeggio(echo((X+transpose(X,7) ) ,4,6) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) +arpeggio(transpose((transpose(X,-5) +transpose(echo(X,4,6) ,7) ) ,-7) ) ) +transpose(echo(transpose(echo(transpose(X,-7) ,4,6) ,-5) ,4,6) ,4) ) +transpose((transpose(transpose(step(echo(step(X,12) ,4,6) ,12) ,4) ,-7) +transpose(arpeggio(transpose(transpose(transpose(X,-5) ,-7) ,-7) ) ,7) ) ,7) ) ) ) ,4) ,-7) ,12) ) ,-5) ,12) ) ,4) ) +transpose(shuffle((transpose(arpeggio(step(((transpose(shuffle((arpeggio(X) |(shuffle(X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,7) ) +X) ,7) ) ) ) ,-5) +transpose((arpeggio(((echo((echo(X,4,6) +X) ,4,6) +((step(transpose(echo(X,4,6) ,4) ,12) +transpose(shuffle(shuffle(X) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) +(((transpose(transpose(X,4) ,4) +transpose(X,4) ) +transpose((step(X,12) +transpose(step(X,12) ,7) ) ,7) ) +arpeggio(step(X,12) ) ) ) ) +transpose(transpose(transpose(transpose(transpose((transpose(transpose((X+transpose(X,12) ) ,4) ,-7) +transpose(arpeggio(step((X|X) ,12) ) ,12) ) ,-7) ,-7) ,4) ,-5) ,7) ) ,4) ) +transpose(echo(transpose((echo(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,-7) ,4,6) +step((echo(X,4,6) |echo(X,4,6) ) ,12) ) ,-7) ,4,6) ,7) ) ,12) ) ,-5) +transpose(shuffle(echo(step(transpose(transpose((transpose((((((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(shuffle(X) ,12) ) +transpose(((shuffle(X) +transpose((echo(X,4,6) +transpose(arpeggio(X) ,12) ) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,7) ) +transpose(transpose(arpeggio(transpose(X,-5) ) ,4) ,7) ) ,-7) +transpose(transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,12) ) ,-5) ,-7) ,12) ,4,6) ) ,12) ) ) ,7) ) ,-7)
random seed used was 231341508

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