On 2009’s scene-defining Dark Was The Night compilation, the National’s Aaron Dessner and Bon Iver’s Justin Vernon teamed up on a song called “Big Red Machine.” Years later, when the two musicians began creating together again — while building out an extended universe of projects like the Eaux Claires and 37d03d festivals — they called the band Big Red Machine, too. These efforts culminated in a fantastic self-titled album three summers ago. Today, they’re announcing a second LP.