Musician John Darnielle got his start by recording tunes on a boombox in the early 1990s. To his surprise, folks went crazy for his lo-fi sound and his band, The Mountain Goats, quickly formed a huge cult following that spans the globe. The band’s 7th album, “All Eternals Deck,” was recently released on Merge Records. For it, Darnielle abandoned the nostalgic vibe that initially earned him critical acclaim and turned to horror flicks from the 1970s for inspiration.