This track finds Foo Fighters leader Dave Grohl returning to his Nirvana-era roots with Nevermind
producer Butch Vig
at the helm and Nirvana bassist Krist Novoselic making a guest appearance. Grohl told Q
magazine that he has always stayed in touch with Novoselic and called him in when he felt the song would benefit from his former bandmate's bass and accordion skills. "One of the things about the expanded Nirvana family, it doesn't matter how much time has passed, when you see each other you're immediately connected by that, by the good and bad things," he explained. "When I see Krist, I hug him to celebrate our lives, but I also hug him to console him. There's a song called 'I Should Have Known' that I thought would sound great with his bass-playing and accordion-playing. It's probably the darkest song on the album."