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:
((shuffle(transpose(((transpose(((transpose((transpose(transpose(X,-5) ,-5) |arpeggio(X) ) ,-7) +transpose(arpeggio(transpose(step(transpose(X,-5) ,12) ,4) ) ,4) ) +transpose(arpeggio((step(X,12) +transpose((X+transpose(X,12) ) ,7) ) ) ,7) ) ,4) +transpose((transpose(step((X|X) ,12) ,4) +echo(((transpose(((((((step(transpose(X,-5) ,12) +transpose(transpose((X+X) ,-5) ,4) ) +transpose((transpose(X,-5) |X) ,7) ) +transpose(step((X|X) ,12) ,4) ) +transpose((transpose(transpose(X,-7) ,-7) +transpose((X+transpose(transpose(X,-7) ,7) ) ,7) ) ,7) ) +transpose(echo(transpose(transpose(transpose(X,-7) ,-7) ,-7) ,4,6) ,7) ) +transpose(step(transpose(shuffle(X) ,-5) ,12) ,7) ) ,4) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-5) ,4) ) +transpose(transpose(step(shuffle(echo((transpose(X,4) +transpose(transpose(X,-5) ,-7) ) ,4,6) ) ,12) ,-5) ,7) ) ,4,6) ) ,12) ) +transpose(transpose(transpose(arpeggio(echo(transpose(step(transpose(X,4) ,12) ,4) ,4,6) ) ,-5) ,-5) ,-7) ) ,4) ) +transpose((((arpeggio(transpose(echo(((transpose(transpose(X,-5) ,-7) +transpose((transpose(((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,4,6) ,-5) ) +transpose(step((transpose((echo((X+transpose(X,12) ) ,4,6) +arpeggio((echo(transpose(echo(X,4,6) ,-5) ,4,6) +transpose(((((X|X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +((X|X) +transpose(transpose(X,-5) ,7) ) ) ,12) ) ) ) ,-5) +transpose(transpose(transpose((transpose(X,-7) +transpose(((X+transpose(transpose(transpose(transpose(X,-5) ,-7) ,4) ,4) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,7) ) ,12) ) ,-7) ,-5) ,12) ) ,12) ,12) ) +transpose(transpose(transpose(transpose(step(shuffle(shuffle((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ,-5) ,-5) ,-5) ,7) ) +transpose(transpose(transpose((((transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) |(shuffle((X+transpose((X+transpose(X,7) ) ,12) ) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ) ,-5) ,-5) +transpose(transpose(echo(transpose((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,-5) ,4,6) ,-7) ,4) ) +transpose(arpeggio(transpose((transpose(transpose(X,-5) ,4) +transpose(echo(X,4,6) ,12) ) ,-5) ) ,7) ) +transpose(transpose((X+X) ,-7) ,7) ) ,-7) ,4) ,7) ) ,4) ) +transpose(transpose(((transpose((shuffle(((echo(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(X,7) ) +transpose((transpose(X,4) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,7) ) ,4,6) +step(shuffle(step(X,12) ) ,12) ) |step(((((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) +transpose((arpeggio(X) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(transpose(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) ,-7) ,7) ) ,12) ) ) +transpose((shuffle((((step(transpose(X,4) ,12) +transpose(shuffle(transpose((X+transpose(X,12) ) ,4) ) ,4) ) +transpose(transpose(arpeggio((echo(X,4,6) |shuffle(X) ) ) ,4) ,7) ) +(((shuffle(X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,12) ) +transpose(step(transpose(X,4) ,12) ,12) ) ) ) |step(transpose((X+transpose(X,12) ) ,-5) ,12) ) ,7) ) ,-7) +transpose((transpose(transpose(transpose(step(transpose(((shuffle(X) +transpose(X,-7) ) |transpose(transpose(echo(X,4,6) ,-5) ,4) ) ,-5) ,12) ,4) ,4) ,-7) +transpose((echo(echo(((transpose(shuffle(X) ,-7) +transpose(arpeggio(transpose(transpose(transpose(X,-5) ,4) ,-7) ) ,4) ) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(step((transpose(X,-5) |X) ,12) ,7) ) ,7) ) ,4,6) ,4,6) |(arpeggio(((arpeggio(((transpose(transpose(shuffle(X) ,-5) ,4) +transpose((((X+transpose(X,7) ) +X) +echo(((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ) +transpose(((transpose(arpeggio(transpose((transpose(transpose(X,-7) ,-5) +transpose(transpose(X,-7) ,7) ) ,4) ) ,4) +transpose(shuffle(echo(step(arpeggio(X) ,12) ,4,6) ) ,4) ) +transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ,-5) ,7) ) ,4) ) +transpose(transpose(transpose(transpose(transpose(transpose((X+X) ,4) ,-5) ,4) ,-5) ,-7) ,7) ) ) |transpose(((transpose(X,4) +transpose((step(X,12) +transpose(step(step(X,12) ,12) ,12) ) ,4) ) +transpose((arpeggio(X) |transpose(X,-5) ) ,7) ) ,-5) ) ) ,7) ) ,4) ) +transpose(shuffle(transpose(step((shuffle((((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) ) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-5) ,12) ) ,12) ,-7) ) ,7) ) ,4) ,7) )
random seed used was 12 EXPR = transpose(transpose(shuffle(arpeggio(((((shuffle(transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ,4) ) +transpose(echo(step(transpose((X+transpose(step(X,12) ,12) ) ,-7) ,12) ,4,6) ,4) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) |echo((((X|((X+transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose((transpose(X,-7) +transpose(arpeggio(X) ,12) ) ,7) ) ) +transpose((transpose((transpose(X,-7) +transpose(X,12) ) ,-7) +transpose(echo(((X+transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,7) ) ,12) ) +transpose(transpose(arpeggio(X) ,-5) ,12) ) ,4,6) ) +transpose(transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(step(X,12) ,4) ,7) ) ,12) ,4) ,7) ) ) ) ,-5) ,4)
random seed used was 0 EXPR = shuffle(((transpose(echo(transpose(transpose(transpose(transpose(X,4) ,4) ,-5) ,-5) ,4,6) ,-5) +transpose((((step((echo(transpose(((X+transpose(transpose(X,-5) ,7) ) +transpose(transpose(X,4) ,12) ) ,-7) ,4,6) +transpose(shuffle((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) ) ,12) ) ,12) +transpose((transpose(arpeggio((X+X) ) ,-5) +transpose(transpose(transpose(echo(transpose((X|X) ,-5) ,4,6) ,-7) ,4) ,7) ) ,7) ) +((step((echo(transpose(X,-7) ,4,6) +transpose(transpose(((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) ,12) ) ,12) +transpose(step((transpose((X+transpose(transpose(X,-7) ,12) ) ,-7) +transpose(((transpose(transpose(X,-5) ,-5) +transpose(transpose(((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4) ,7) ) |transpose(X,-5) ) ,7) ) ,12) ,4) ) +transpose(((transpose(transpose(echo(transpose(X,-7) ,4,6) ,-7) ,-7) +transpose((((X|shuffle(X) ) +transpose(transpose(((X+transpose((X+transpose(X,12) ) ,12) ) +step(arpeggio(X) ,12) ) ,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(arpeggio(((shuffle(transpose((X|X) ,-5) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ,7) ) ) +transpose((transpose(((((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((transpose(echo(X,4,6) ,4) +((X+transpose(X,12) ) |step(X,12) ) ) ,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) +(transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(transpose(transpose(X,-7) ,-7) ,4) ,12) ) ) ,-7) +transpose(transpose(transpose(shuffle(transpose(transpose(X,4) ,-7) ) ,-7) ,4) ,12) ) ,7) ) ,4) ) +transpose(((transpose((step(transpose(echo(X,4,6) ,4) ,12) +transpose(transpose(X,4) ,7) ) ,-5) +transpose(transpose((echo(transpose(((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,4) ,4,6) +transpose((transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) +arpeggio(transpose(X,-7) ) ) ,7) ) ,4) ,4) ) +transpose(transpose(echo(transpose(arpeggio(((((X+transpose(X,12) ) +transpose(((X+transpose(X,7) ) +transpose(transpose(transpose(X,4) ,4) ,12) ) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) +step(step(echo(X,4,6) ,12) ,12) ) ) ,4) ,4,6) ,-5) ,7) ) ,7) ) )
random seed used was 0 EXPR = echo(((transpose(transpose(transpose(((shuffle(transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ) +transpose(transpose(transpose((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) ,4) ,-5) ,4) ) +transpose(echo((transpose(shuffle(X) ,4) +transpose((echo(X,4,6) +transpose(transpose(arpeggio(X) ,4) ,12) ) ,12) ) ,4,6) ,7) ) ,4) ,-5) ,-5) +transpose(step(((transpose(transpose(((transpose((transpose(transpose(X,4) ,-5) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,4) +transpose(step((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,12) ) |transpose(arpeggio((transpose((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) ,4) +transpose(step((transpose(X,-5) |transpose(X,4) ) ,12) ,12) ) ) ,-5) ) ,4) ,4) +transpose(transpose(arpeggio(transpose(shuffle(transpose(arpeggio((shuffle(X) +transpose((X+transpose(shuffle(X) ,7) ) ,12) ) ) ,4) ) ,-7) ) ,-5) ,4) ) +transpose((step((((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(step(step(transpose(X,4) ,12) ,12) ,4) ) +transpose(echo(((shuffle(step(transpose(X,4) ,12) ) +transpose(arpeggio(X) ,4) ) +transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,4,6) ,7) ) ,12) +((transpose(transpose((X+X) ,-5) ,4) +transpose((((X+transpose(X,-7) ) +arpeggio((X|X) ) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,7) ) |transpose(echo(transpose(arpeggio(X) ,-5) ,4,6) ,4) ) ) ,7) ) ,12) ,4) ) +transpose(transpose(((((((transpose(step(X,12) ,-7) +transpose(arpeggio(step(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,4) ) +transpose(step(((transpose(transpose(X,-5) ,4) +transpose(((transpose(X,-5) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(arpeggio((step(X,12) |step(X,12) ) ) ,7) ) ,12) ,7) ) +transpose((transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4) |((((echo(X,4,6) |X) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |shuffle(transpose(X,4) ) ) ) ,7) ) +((transpose((echo(transpose((X|X) ,4) ,4,6) +step((X+transpose(X,7) ) ,12) ) ,4) +transpose(transpose(shuffle(transpose(X,4) ) ,4) ,4) ) +transpose(transpose(transpose(echo(transpose(X,4) ,4,6) ,-7) ,4) ,7) ) ) +transpose(shuffle(transpose(step((step(X,12) +transpose((((transpose(transpose(X,-7) ,4) +transpose(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((arpeggio(transpose(X,4) ) +transpose(arpeggio(echo(shuffle(X) ,4,6) ) ,7) ) ,12) ) ,12) ) ,12) ,4) ) ,12) ) |arpeggio(transpose(transpose(shuffle(shuffle((transpose(transpose((X+transpose(step(X,12) ,12) ) ,-7) ,-5) +transpose(X,4) ) ) ) ,-5) ,-7) ) ) ,-5) ,7) ) ,4,6)
random seed used was 0

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