Bon Iver mainman Justin Vernon sped up a You Tube sample
of Stevie Nicks singing "Wild Heart" and looped it over the opening of this song. He told Uncut
"It's from my favorite YouTube video of all time. It's Stevie Nicks warming up in 1981, while getting her hair done and singing 'Wild Heart.' Somebody offstage is singing harmony and it's the best piece of music."