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:
(((shuffle(arpeggio(transpose(transpose(echo(transpose(transpose((echo((echo(X,4,6) +(X|step(X,12) ) ) ,4,6) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) ,-7) ,-5) ,4,6) ,4) ,-5) ) ) |(((echo(((transpose(((((X+X) +transpose(X,12) ) |transpose((X+X) ,4) ) |(arpeggio(transpose(X,4) ) +transpose((X+X) ,4) ) ) ,4) +echo(transpose(transpose((X+transpose(((transpose(X,-7) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,-5) ,4) ,4,6) ) +(step((X+(X+transpose(X,7) ) ) ,12) +transpose(step((echo(shuffle(X) ,4,6) |transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ) ,12) ,7) ) ) ,4,6) +transpose((shuffle(((transpose((((transpose(step((X+X) ,12) ,4) +(transpose((X|X) ,-5) +transpose(transpose(X,4) ,-7) ) ) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose((X+transpose(X,4) ) ,7) ) ,-7) +transpose(((X|X) |X) ,4) ) +transpose(echo(step((X+transpose(X,7) ) ,12) ,4,6) ,7) ) ) +(transpose(arpeggio(step(transpose((step(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,12) +((X+transpose(((X+transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) ,7) ) +transpose((step(X,12) +X) ,-7) ) ) ,4) ,12) ) ,-5) +transpose(((echo(transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(((X|X) +(X|X) ) ,7) ) ,-5) ,4,6) +transpose(transpose((((X|X) +transpose((X+X) ,7) ) +transpose(X,-5) ) ,-5) ,12) ) +transpose((transpose((transpose(transpose((X+transpose(X,7) ) ,4) ,-7) +transpose((transpose(step(X,12) ,-5) +transpose((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,-5) +transpose(transpose(transpose(transpose(X,4) ,-7) ,-7) ,12) ) ,4) ) ,12) ) ) ,4) ) +transpose(transpose(arpeggio(echo(transpose(transpose(echo(transpose(X,-7) ,4,6) ,4) ,-7) ,4,6) ) ,-7) ,7) ) +transpose(((((transpose((((X+X) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) +echo(echo(arpeggio(X) ,4,6) ,4,6) ) ,-5) +transpose((transpose(((transpose(X,-5) |X) +transpose(X,7) ) ,-7) |(transpose(transpose(X,-5) ,4) +(transpose(X,-7) |X) ) ) ,7) ) +transpose(((transpose((step(X,12) |step((X+X) ,12) ) ,4) +transpose((arpeggio(transpose(X,4) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,-7) ) +transpose((shuffle(echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) ) +transpose(transpose(((X|((X+transpose(shuffle(X) ,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose((transpose(X,-7) +transpose(X,-5) ) ,7) ) ,4) ,7) ) ,12) ) ,-5) ) +transpose(((transpose((step((transpose((shuffle(X) +transpose(X,7) ) ,-5) +transpose(transpose((X+X) ,4) ,7) ) ,12) |step(transpose(arpeggio(X) ,4) ,12) ) ,4) +transpose(transpose((((step(X,12) +transpose(X,7) ) +transpose(arpeggio(X) ,7) ) |((transpose(X,-7) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) ,-5) ,4) ) +transpose((((((X+(X|X) ) |(step(X,12) |echo(X,4,6) ) ) |transpose((transpose(X,4) +transpose(echo(X,4,6) ,7) ) ,-7) ) |(((X+X) +transpose(X,4) ) +transpose(X,7) ) ) +(shuffle((X+transpose(echo(X,4,6) ,7) ) ) +transpose(transpose(transpose((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ) ,4) ,-5) ,7) ) ) ,7) ) ,4) ) +transpose((((transpose((((X|X) |(X+X) ) +(echo(echo(X,4,6) ,4,6) |(((arpeggio(X) +transpose((X|X) ,7) ) +transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) ,4) ) +transpose(((transpose(X,-7) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,7) ) ) ) ,-7) +transpose(transpose(transpose(transpose(shuffle(X) ,4) ,-5) ,-5) ,4) ) +transpose((transpose(transpose(transpose(transpose(transpose(X,-7) ,-7) ,-7) ,-5) ,4) +step((X+X) ,12) ) ,7) ) +(transpose(shuffle(shuffle(transpose(transpose(X,-7) ,-7) ) ) ,-5) +(((((echo(X,4,6) |X) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(((X+transpose(X,7) ) +transpose((X|X) ,12) ) ,7) ) +transpose((transpose(arpeggio(X) ,4) +((X+X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) |transpose(((X+((transpose(X,-5) +transpose(X,12) ) |((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) ) +transpose(((X+X) +transpose((X+transpose(X,7) ) ,12) ) ,4) ) ,4) ) ) ) ,7) ) ,12) ) ) +transpose(((transpose(((transpose((((transpose(X,-7) |(X+X) ) +transpose(transpose(transpose(X,4) ,-7) ,12) ) |step((step((step(X,12) |step(X,12) ) ,12) +transpose(((X+transpose(X,7) ) |(X+X) ) ,7) ) ,12) ) ,4) +transpose((transpose((transpose(echo(X,4,6) ,-7) +echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ) ,-5) +((transpose(transpose(step((step(X,12) +(X|X) ) ,12) ,4) ,-7) +transpose((((((step(X,12) +transpose(transpose(X,-5) ,7) ) |transpose(transpose(X,4) ,-5) ) +(X|X) ) +transpose(step(shuffle(step(X,12) ) ,12) ,-5) ) |((X|((X+X) +transpose(X,12) ) ) +transpose((X+transpose(X,4) ) ,7) ) ) ,4) ) +transpose(transpose(transpose(transpose(((X|X) +transpose(X,12) ) ,-5) ,-7) ,-5) ,7) ) ) ,7) ) +transpose(transpose((arpeggio(step(arpeggio(transpose(shuffle(arpeggio((X+transpose((echo(X,4,6) +transpose(X,7) ) ,7) ) ) ) ,4) ) ,12) ) +transpose(echo(shuffle(transpose(((echo((((X+X) +transpose((X|X) ,4) ) +transpose(X,7) ) ,4,6) |arpeggio(transpose(arpeggio(echo(X,4,6) ) ,-7) ) ) +((transpose(X,-7) +(X+transpose(X,7) ) ) |(X+transpose(X,7) ) ) ) ,4) ) ,4,6) ,12) ) ,4) ,12) ) ,-7) |transpose(transpose(transpose(echo((transpose((transpose((transpose((X+transpose(X,12) ) ,-7) +transpose((X|X) ,7) ) ,-7) +(transpose(X,-5) +transpose((((X|X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,7) ) ) ,4) +echo(((echo(shuffle(arpeggio(X) ) ,4,6) +((transpose(X,-7) |X) +(arpeggio(X) |X) ) ) +transpose((transpose(transpose(X,-5) ,-7) |transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) ,-5) ) ,12) ) ,4,6) ) ,4,6) ,-7) ,-7) ,-7) ) +(transpose((((step(((transpose(((X|X) +transpose(shuffle(X) ,7) ) ,4) +transpose(step(arpeggio((echo(X,4,6) +transpose((X+transpose(transpose(X,-7) ,12) ) ,7) ) ) ,12) ,7) ) |transpose(echo(((X+X) +transpose((transpose(transpose(X,-5) ,-5) +transpose((transpose(X,-5) +(X+transpose(X,12) ) ) ,7) ) ,7) ) ,4,6) ,-5) ) ,12) +(((transpose(echo(X,4,6) ,-5) |((transpose(X,4) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(((X|X) +transpose((shuffle(X) +transpose(echo(X,4,6) ,7) ) ,7) ) ,7) ) ) |(transpose(X,-5) +transpose(step(X,12) ,12) ) ) +transpose(transpose(((((X|X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +arpeggio((step(X,12) |X) ) ) ,-5) ,12) ) ) +transpose(step(transpose((transpose((transpose(transpose(transpose(step(X,12) ,-5) ,4) ,-5) +((transpose(X,4) |(X+transpose(X,12) ) ) +transpose(X,7) ) ) ,-7) |(((echo(step(transpose(X,-5) ,12) ,4,6) |X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |X) +(echo(X,4,6) +arpeggio(arpeggio(X) ) ) ) ,4) ) +transpose(((X+transpose(X,7) ) +echo(X,4,6) ) ,7) ) ) ,-7) ,12) ,4) ) +transpose(((step(((((((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,7) ) |(echo(transpose((X+X) ,4) ,4,6) +transpose((X+X) ,4) ) ) |arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) ) ) ) +transpose(transpose(((((shuffle(X) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +(((X+transpose(X,4) ) +transpose(X,7) ) |transpose(transpose(X,4) ,4) ) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ,4) ) |transpose(transpose(((((transpose(step(X,12) ,-5) +transpose((transpose((X+transpose(X,12) ) ,4) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) +(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,-7) +shuffle((X|X) ) ) ) +transpose(((arpeggio(transpose((X|X) ,-7) ) +transpose(shuffle((X+X) ) ,4) ) +transpose((X|X) ,7) ) ,12) ) ,4) ,-7) ) ,12) +transpose(transpose(step(shuffle(step(X,12) ) ,12) ,4) ,4) ) +transpose(((transpose(transpose((((transpose(((X+X) +X) ,-5) +transpose(shuffle(X) ,7) ) +X) +transpose(shuffle(transpose(transpose(X,4) ,-7) ) ,12) ) ,-5) ,4) +shuffle(transpose(echo(transpose((step((X+X) ,12) +transpose(((X|X) +transpose((step(X,12) +X) ,7) ) ,12) ) ,-7) ,4,6) ,4) ) ) +transpose(arpeggio(transpose(((echo((((X+X) +(((X+X) +transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) |(transpose(step(X,12) ,-7) +transpose((X+X) ,4) ) ) ,4,6) +transpose(((transpose(step(X,12) ,4) +transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(step(((transpose(X,4) +transpose((X+X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,7) ) ,4) ) ,12) ) ,7) ) ,7) ) ,-5) +echo((transpose(transpose(arpeggio(transpose((transpose((transpose(shuffle(((X|X) +step(X,12) ) ) ,-5) +transpose(transpose(echo(((X+transpose(X,12) ) |(X+X) ) ,4,6) ,-5) ,7) ) ,-7) |((shuffle((shuffle(X) +transpose((X+transpose(X,7) ) ,7) ) ) |arpeggio(echo(X,4,6) ) ) +transpose(transpose((X|X) ,4) ,-7) ) ) ,4) ) ,-7) ,4) +transpose(step((step(transpose(transpose(echo(((((X|echo(X,4,6) ) +transpose(transpose(X,-7) ,4) ) +transpose(((X|(X+X) ) +transpose(transpose(X,4) ,7) ) ,7) ) |(arpeggio(echo(X,4,6) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ) ,4,6) ,4) ,-7) ,12) +((((transpose((arpeggio(step((echo(X,4,6) +arpeggio(X) ) ,12) ) +(((shuffle(arpeggio(X) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((transpose(X,4) |arpeggio(X) ) |echo(X,4,6) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(arpeggio(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) ,-5) ,7) ) |transpose(transpose(transpose((step(X,12) +step(X,12) ) ,-5) ,4) ,4) ) |(((((arpeggio(X) +transpose((X+X) ,-5) ) +((X|X) +transpose((X+X) ,7) ) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio((shuffle(X) +(X+X) ) ) ,7) ) +((arpeggio(step(X,12) ) +transpose(X,7) ) +(transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-7) ,4) +transpose((transpose(X,4) |((transpose(X,4) +transpose(X,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ) ,12) ) ) ) ) ) ,12) ,12) ) ,4,6) ) ) ,-5) ) +transpose(shuffle((((transpose((shuffle(shuffle(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) ) |(((((transpose((transpose(X,4) |X) ,-7) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) |(arpeggio(((shuffle(X) +transpose((X+X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +X) ) +(step(transpose((arpeggio(echo(arpeggio(X) ,4,6) ) +transpose(X,7) ) ,-7) ,12) +(((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) +X) ) ) +transpose(transpose(shuffle(shuffle(transpose(transpose(arpeggio(X) ,4) ,4) ) ) ,-5) ,4) ) +transpose(echo(transpose(transpose(step((echo(X,4,6) |X) ,12) ,4) ,-7) ,4,6) ,7) ) ) ,4) +transpose(((arpeggio((transpose(transpose(transpose(transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,-7) ,-7) ,-5) +transpose(((X+X) +transpose((X+transpose(shuffle(X) ,7) ) ,12) ) ,-5) ) ) +(echo((((step(transpose((X|X) ,-5) ,12) +transpose(((X|X) +transpose(X,-5) ) ,-5) ) |(step(X,12) |(((arpeggio(X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(transpose((X|X) ,-7) ,12) ) ) ) |(arpeggio(transpose((X+X) ,-5) ) +transpose(transpose(shuffle(transpose((X|X) ,-7) ) ,-5) ,7) ) ) ,4,6) +transpose(step((transpose(((arpeggio(X) +transpose(X,7) ) |transpose((X+X) ,-7) ) ,4) |echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4,6) ) ,12) ,-7) ) ) |transpose((((((step(X,12) +transpose(((arpeggio(transpose(X,-7) ) +transpose(echo(X,4,6) ,4) ) +transpose(step((X|X) ,12) ,7) ) ,7) ) |(((X+transpose(X,12) ) +transpose(echo(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ,4,6) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +((X|X) +(X|X) ) ) ,12) ) +step(transpose(shuffle(echo((X+transpose(X,7) ) ,4,6) ) ,-5) ,12) ) +transpose(transpose(transpose(transpose((X+X) ,-5) ,-5) ,4) ,7) ) ,4) ) ,7) ) +(((((transpose((X|((X+transpose(X,12) ) +transpose(((X|X) +transpose(X,7) ) ,7) ) ) ,-7) +transpose((arpeggio((X+X) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose((((transpose(transpose(X,-7) ,-7) +step(echo(X,4,6) ,12) ) +step((transpose((X|arpeggio(X) ) ,-5) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-5) ,12) ) ,12) ) +((((transpose(X,4) +transpose((X+X) ,7) ) +echo((X+transpose(X,12) ) ,4,6) ) +transpose((transpose(X,-5) |(transpose(X,-7) +X) ) ,12) ) +transpose(transpose(((transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) +transpose(transpose(arpeggio((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ) ,4) ,4) ) +transpose((transpose(X,-7) |(X+transpose(X,12) ) ) ,7) ) ,-5) ,7) ) ) ,7) ) +transpose(transpose(transpose(transpose(transpose(step((X+transpose((X+X) ,12) ) ,12) ,4) ,-5) ,4) ,-5) ,4) ) +transpose(transpose(shuffle(transpose(X,-7) ) ,-7) ,7) ) |arpeggio((((transpose((((((transpose((transpose(transpose(X,-7) ,4) +transpose(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ,12) ) ,4) +transpose(transpose(transpose(((X+transpose(X,12) ) +X) ,-5) ,-7) ,4) ) +transpose(transpose(step(transpose(X,-7) ,12) ,4) ,7) ) +transpose(echo(((transpose(X,-7) |transpose((X+transpose((X|X) ,12) ) ,4) ) +transpose(step((transpose(arpeggio(X) ,4) +transpose(X,12) ) ,12) ,12) ) ,4,6) ,4) ) +transpose(transpose((step(transpose(X,-7) ,12) |(X+transpose(X,4) ) ) ,4) ,7) ) +transpose((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) ) ,4) +transpose(echo(echo((arpeggio(X) +(X+shuffle(X) ) ) ,4,6) ,4,6) ,4) ) +transpose((transpose(X,4) +transpose(arpeggio(transpose(transpose(arpeggio(X) ,-7) ,-5) ) ,7) ) ,7) ) |(echo((((shuffle(X) |echo(X,4,6) ) |echo((X+transpose(X,12) ) ,4,6) ) +transpose((arpeggio(((transpose(X,-7) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ) +((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) ) ,12) ) ,4,6) +transpose(transpose((step((X+transpose(X,7) ) ,12) +step(X,12) ) ,-5) ,12) ) ) ) ) ) +transpose(shuffle((transpose(echo((X+transpose(X,7) ) ,4,6) ,4) +shuffle(transpose(X,-7) ) ) ) ,12) ) ) ,7) )
random seed used was 230842740

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