|
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.
| |
|
After 14 generations the expression "X" became this: | echo(shuffle(((transpose(((shuffle(transpose(arpeggio(shuffle(X) ) ,-5) ) +transpose(shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) +transpose(step(X,12) ,-7) ) ) ,4) ) +transpose(transpose(transpose(transpose(transpose(X,-7) ,4) ,4) ,-7) ,7) ) ,-5) |transpose(transpose((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) +echo(((X|X) |(X+X) ) ,4,6) ) ,-7) ,4) ) +transpose((echo(((arpeggio(transpose(X,4) ) +transpose(shuffle(((shuffle(X) +transpose(X,7) ) +transpose(arpeggio(X) ,-5) ) ) ,7) ) |(step(transpose(X,-5) ,12) |transpose(X,-5) ) ) ,4,6) +transpose(((transpose((((arpeggio((X+X) ) +transpose((X|(X+X) ) ,4) ) +transpose((((X+X) +X) +echo((X+transpose(X,7) ) ,4,6) ) ,7) ) +transpose((((transpose(X,4) +transpose((X+X) ,7) ) |((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(echo(X,4,6) ,12) ) ,7) ) ,4) +transpose(transpose(X,-5) ,4) ) +transpose((transpose(transpose((arpeggio(X) +transpose((X|X) ,12) ) ,-7) ,-5) |((((X+transpose((X+X) ,7) ) +transpose((transpose((X|X) ,-7) +transpose(echo((X|X) ,4,6) ,7) ) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) |step(shuffle(X) ,12) ) ) ,7) ) ,12) ) ,12) ) ) ,4,6) random seed used was 209387834
EXPR = (((transpose((transpose(shuffle(shuffle(((transpose(X,4) +transpose(transpose(echo(transpose(X,-7) ,4,6) ,4) ,7) ) |step(((echo(X,4,6) +transpose(echo(X,4,6) ,12) ) |(X|X) ) ,12) ) ) ) ,-7) +transpose(shuffle(step(((transpose((transpose(X,-5) +transpose((X+X) ,-5) ) ,-7) +transpose(transpose(((X|X) +transpose(X,-5) ) ,-5) ,4) ) +transpose((arpeggio(transpose(X,-5) ) +transpose(shuffle(transpose(echo(X,4,6) ,-5) ) ,7) ) ,7) ) ,12) ) ,7) ) ,-5) +((shuffle(shuffle((((transpose(X,4) +((X+transpose(echo(X,4,6) ,12) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) ) ) +transpose(shuffle(echo(transpose(echo(X,4,6) ,-7) ,4,6) ) ,4) ) +transpose(echo(transpose(echo(transpose(X,-5) ,4,6) ,-5) ,4,6) ,7) ) ) ) +transpose(shuffle(echo(shuffle((shuffle(X) +echo(X,4,6) ) ) ,4,6) ) ,7) ) +transpose(step(transpose(((echo((shuffle(X) +(transpose(echo(X,4,6) ,4) +transpose(X,7) ) ) ,4,6) +transpose(step((shuffle(echo(X,4,6) ) |transpose(shuffle(X) ,4) ) ,12) ,7) ) +((((X|X) +transpose((transpose(echo((X+transpose(X,7) ) ,4,6) ,4) +transpose(transpose(echo(X,4,6) ,4) ,-7) ) ,12) ) +transpose(echo((transpose(echo(shuffle(X) ,4,6) ,-5) +transpose(X,4) ) ,4,6) ,4) ) +transpose(echo(echo(echo(transpose((X|X) ,-7) ,4,6) ,4,6) ,4,6) ,7) ) ) ,4) ,12) ,7) ) ) +transpose((shuffle(((((transpose(step(echo((step(X,12) +transpose((X+X) ,7) ) ,4,6) ,12) ,4) +transpose(shuffle(echo((X+transpose(X,12) ) ,4,6) ) ,4) ) |(transpose(echo(X,4,6) ,-7) +(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4) +echo(echo(X,4,6) ,4,6) ) ) ) +transpose((step(shuffle(transpose(((transpose(X,-7) +transpose((X+X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) ,12) +transpose(echo(arpeggio(shuffle(((X+transpose(X,7) ) +shuffle(X) ) ) ) ,4,6) ,7) ) ,7) ) +(transpose(transpose(((X+X) +X) ,-5) ,4) +transpose(shuffle((transpose((X+transpose(X,12) ) ,-5) +transpose(shuffle(transpose((X|shuffle(transpose(X,4) ) ) ,-7) ) ,7) ) ) ,12) ) ) ) +(((((arpeggio(shuffle(shuffle(X) ) ) |transpose((shuffle(X) +X) ,4) ) +(shuffle(shuffle(X) ) |shuffle(echo(X,4,6) ) ) ) +transpose(((transpose(((X+transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,7) ) ,4) |transpose((shuffle((X+shuffle(X) ) ) +transpose(shuffle(X) ,7) ) ,-7) ) |(((shuffle(echo((X|X) ,4,6) ) |transpose(step(arpeggio(X) ,12) ,-7) ) +transpose(((echo(transpose(transpose(X,4) ,-5) ,4,6) +transpose(transpose(((arpeggio(shuffle(X) ) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4) ,4) ) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +shuffle(X) ) |shuffle((X|X) ) ) ,7) ) ,4) ) +transpose((((X|X) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose(arpeggio((transpose((X+X) ,4) +transpose(shuffle((X+X) ) ,12) ) ) ,7) ) ,7) ) ) ,7) ) +transpose((shuffle(shuffle(((((shuffle(X) |shuffle((X+X) ) ) |((X+transpose(X,12) ) +(X+(X+transpose(X,7) ) ) ) ) +transpose((transpose(transpose(shuffle(X) ,-7) ,4) |transpose(transpose(X,-7) ,-5) ) ,4) ) +transpose((((X+transpose(arpeggio(X) ,12) ) +(X+transpose(X,12) ) ) +transpose((transpose(transpose(X,-5) ,-7) +transpose((shuffle(X) |(X+transpose(X,12) ) ) ,7) ) ,7) ) ,7) ) ) ) +transpose((echo(transpose(transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(((X+X) +transpose(X,12) ) ,7) ) ,4) ,-7) ,4,6) +transpose(echo(shuffle(((step(X,12) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(transpose(transpose(step(X,12) ,4) ,-5) ,7) ) ) ,4,6) ,12) ) ,7) ) ,12) ) +transpose(echo((transpose(transpose(((transpose(X,-5) +transpose(step((X|X) ,12) ,4) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,-5) ,4) +transpose(transpose((shuffle(X) |arpeggio((X+transpose(transpose(X,-7) ,7) ) ) ) ,-5) ,7) ) ,4,6) ,12) ) ) ,4) ) +transpose(transpose(transpose((arpeggio(((((transpose(X,-5) +transpose(transpose(X,4) ,7) ) +transpose(shuffle(transpose(transpose((X+X) ,-7) ,-7) ) ,4) ) +transpose(((X|(X+transpose(X,7) ) ) +(((X|X) +transpose(transpose(X,-5) ,12) ) +transpose((X|shuffle(X) ) ,7) ) ) ,7) ) +arpeggio(transpose((X+(X|X) ) ,-7) ) ) ) |transpose((shuffle(shuffle(shuffle(X) ) ) +transpose(shuffle(X) ,7) ) ,4) ) ,-5) ,4) ,7) ) random seed used was 0
EXPR = arpeggio((shuffle(shuffle((echo(transpose((((X|X) +transpose(X,-7) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ,-7) ,4,6) +transpose((echo(((X+transpose(transpose(X,-7) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,4,6) +transpose((X+transpose(((X|transpose(X,4) ) +transpose(transpose(X,-5) ,-5) ) ,12) ) ,7) ) ,7) ) ) ) |((transpose(((shuffle((transpose(transpose(X,-5) ,-7) +(((((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(step(transpose(X,-7) ,12) ,7) ) +transpose((X|X) ,4) ) +transpose(transpose(((X|X) +transpose(transpose(X,-5) ,12) ) ,-5) ,7) ) ) ) +transpose(((transpose(X,-5) +transpose(arpeggio(step(transpose((X+X) ,4) ,12) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ,12) ) +step((transpose(((shuffle(X) |step(X,12) ) +transpose((transpose(X,-5) +X) ,12) ) ,-5) +transpose(shuffle((((X|X) |(X+arpeggio(X) ) ) +transpose(shuffle(X) ,12) ) ) ,7) ) ,12) ) ,4) +transpose(transpose(shuffle(transpose(echo(transpose(shuffle(X) ,-5) ,4,6) ,-7) ) ,4) ,12) ) |transpose(transpose(transpose(((shuffle(X) |transpose(X,-7) ) +(X+transpose(X,-7) ) ) ,-5) ,-7) ,4) ) ) ) random seed used was 0
EXPR = shuffle(transpose(((shuffle(shuffle(X) ) +(arpeggio(shuffle(transpose((X+X) ,4) ) ) +transpose((step(shuffle(X) ,12) |shuffle(X) ) ,12) ) ) +transpose(transpose(arpeggio(step(transpose(transpose(shuffle(X) ,4) ,-5) ,12) ) ,4) ,7) ) ,-5) ) random seed used was 0
|
The algorithm for Expresso is written in
KeyKit, and
here's the source code.
| | | |