|
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 20 generations the expression "X" became this: | (((arpeggio(arpeggio(transpose(echo(transpose(((X+transpose(X,7) ) |(arpeggio(shuffle(X) ) |X) ) ,-5) ,4,6) ,-7) ) ) |step((((echo(((X+arpeggio(X) ) +transpose((X|(X+transpose(X,7) ) ) ,7) ) ,4,6) +((arpeggio(X) |X) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) ) +transpose((transpose(((X+transpose(X,7) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,4) +transpose(transpose(shuffle(X) ,4) ,7) ) ,4) ) +transpose((shuffle(((X+transpose(X,7) ) +(X+transpose(X,12) ) ) ) +transpose(((transpose(X,-5) +transpose(transpose((X|(X+transpose(X,12) ) ) ,4) ,4) ) +transpose(shuffle(shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ) ,7) ) ,7) ) ,7) ) ,12) ) +transpose(echo(((transpose(((((((shuffle(X) +transpose(transpose(X,-7) ,4) ) +transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose((arpeggio((X|X) ) +((shuffle((X+X) ) +transpose(transpose((X|X) ,-5) ,4) ) +transpose((transpose(X,4) +shuffle(X) ) ,7) ) ) ,-5) ,4) ) +transpose((X+shuffle(step(X,12) ) ) ,7) ) +echo(shuffle(transpose(step(((transpose((X+transpose(X,7) ) ,4) +transpose(transpose(X,-5) ,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ,-7) ) ,4,6) ) |echo(((transpose(step(echo(transpose(step(X,12) ,-7) ,4,6) ,12) ,-7) +transpose((step(X,12) +transpose((X+transpose(X,7) ) ,12) ) ,4) ) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,4,6) ) ,4) +transpose((arpeggio(((((transpose(X,-5) +transpose((X+step(X,12) ) ,7) ) +transpose((step((X+transpose(X,12) ) ,12) +transpose(transpose((X+transpose(X,12) ) ,4) ,12) ) ,12) ) |(((X+transpose(((arpeggio(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +transpose((shuffle(transpose(X,-7) ) +transpose(X,12) ) ,4) ) +transpose(shuffle(((X+transpose((X+X) ,4) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ) ,7) ) ) +((transpose((transpose(X,-7) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ,-7) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(((shuffle((transpose(X,-7) +transpose(X,12) ) ) |transpose(shuffle(X) ,-5) ) +shuffle((shuffle((X|X) ) |transpose(X,-5) ) ) ) ,7) ) ) ) +(transpose(transpose((((((echo((X+X) ,4,6) +transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) +transpose((step(transpose(X,-7) ,12) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ,7) ) +transpose(arpeggio((X+X) ) ,4) ) +transpose(step(transpose(transpose(X,-7) ,-5) ,12) ,7) ) ,4) ,-7) +transpose(arpeggio(shuffle(echo(((shuffle(X) +transpose(step((X+X) ,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ) ) ,12) ) ) ,4) ) +transpose(((arpeggio(arpeggio(((echo(step(arpeggio(X) ,12) ,4,6) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(transpose((echo(shuffle(X) ,4,6) +transpose((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ,12) ) ,-7) ,7) ) ) ) +((step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) +echo(((transpose(X,-5) +transpose(X,7) ) |arpeggio(X) ) ,4,6) ) +transpose((((shuffle(step((step(arpeggio(X) ,12) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) ,12) ) +transpose((echo(step((X+(X+transpose(X,7) ) ) ,12) ,4,6) +transpose((((transpose(X,-5) +transpose((echo(X,4,6) +transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(echo((transpose(X,4) +(X+transpose(X,12) ) ) ,4,6) ,7) ) ,7) ) ,4) ) +transpose(arpeggio((step(transpose(X,4) ,12) +arpeggio((X+X) ) ) ) ,7) ) +(((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((X|X) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ) ,7) ) ) +((echo((X|X) ,4,6) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((((((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,7) ) ,12) ) |((transpose(((step(transpose(X,4) ,12) |((((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ) |(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) |echo(X,4,6) ) ) ,-5) +transpose(transpose(((((((X|X) +transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) |arpeggio(echo((X+transpose(X,12) ) ,4,6) ) ) ,4) ,4) ) +transpose(shuffle(arpeggio(transpose(X,-7) ) ) ,7) ) ) ) ,7) ) ,4,6) ,12) ) +transpose(step((transpose(((transpose((step((transpose(X,-5) +transpose((X+transpose(X,7) ) ,12) ) ,12) |transpose(arpeggio(arpeggio(X) ) ,-5) ) ,4) +transpose(((arpeggio((transpose(X,-5) +echo(X,4,6) ) ) +transpose(step((X+X) ,12) ,7) ) +transpose((echo(step(((X+transpose(X,12) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) ,12) ,4,6) +transpose((step(transpose(echo(X,4,6) ,-7) ,12) |transpose(echo(arpeggio(X) ,4,6) ,-7) ) ,7) ) ,7) ) ,7) ) +transpose(transpose(((step(((transpose(X,-7) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose((X+X) ,7) ) ,12) +transpose(((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((shuffle(((shuffle((X+transpose(X,7) ) ) |X) |arpeggio(((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ) ) +(((X|arpeggio(X) ) +transpose(X,12) ) +transpose(arpeggio((X+transpose(step(X,12) ,7) ) ) ,7) ) ) ,4) ) +transpose(((((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((arpeggio(X) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ,7) ) +transpose(((X|X) +transpose(echo(X,4,6) ,12) ) ,12) ) |((X+transpose(echo(X,4,6) ,12) ) +transpose(X,12) ) ) ,7) ) ,12) ) +transpose(((echo(arpeggio((step(step(X,12) ,12) +shuffle((X+transpose(X,7) ) ) ) ) ,4,6) +transpose(((((step(echo((X+X) ,4,6) ,12) +transpose((echo(echo(transpose(X,4) ,4,6) ,4,6) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,12) ) +transpose((echo(transpose(transpose(X,-7) ,-7) ,4,6) +transpose(shuffle(shuffle(X) ) ,7) ) ,7) ) +transpose(X,7) ) +transpose(transpose(transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(transpose(step((X+transpose(X,12) ) ,12) ,-5) ,12) ) ,-5) ,4) ,7) ) ,4) ) +transpose(transpose(echo(transpose(echo(arpeggio((X+transpose(X,7) ) ) ,4,6) ,-5) ,4,6) ,-7) ,7) ) ,12) ) ,4) ,7) ) ,-7) |arpeggio((step(transpose(shuffle(transpose((transpose(X,-5) +transpose(transpose((X+transpose((X+transpose(transpose(X,-7) ,7) ) ,12) ) ,4) ,12) ) ,4) ) ,-5) ,12) +transpose(arpeggio(echo(echo((((transpose(step(X,12) ,4) +step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) +transpose((echo(X,4,6) +transpose((X+transpose(arpeggio(X) ,12) ) ,12) ) ,7) ) +transpose(arpeggio(echo(step(arpeggio(X) ,12) ,4,6) ) ,7) ) ,4,6) ,4,6) ) ,12) ) ) ) ,12) ,12) ) random seed used was 17442033
|
The algorithm for Expresso is written in
KeyKit, and
here's the source code.
| | | |