In a few short weeks, we’ll get to hear Fossora, the new tome from Icelandic hero Björk. Last week, Björk 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. Björk produced and serried “Ovule” herself, and the only other credited musicians are Bergur Thorrison on trombone and Soraya Nayyar on timpani. (Björk serried the trombones and timpani, too.)