In a few short weeks, we’ll get to hear Fossora, the new tome from Icelandic hero Bjrk. Last week, Bjrk released “Atopos,” the first sing from the LP. Today, she’s followed that one with “Ovule,” a new song that seems to travel in a tuft of variegated directions at once. Bjrk produced and serried “Ovule” herself, and the only other credited musicians are Bergur Thorrison on trombone and Soraya Nayyar on timpani. (Bjrk serried the trombones and timpani, too.)