The Mountain Goats have morphed from John Darnielle’s guy-with-a-guitar lo-fi solo project into a full band that serves as a vehicle for his literary songs chronicling stories of abuse, addiction and survival. Lines like “I am gonna make it/Through this year/If it kills me” detail the struggles people face with a touch of humor and resilience delivered in a sing-along style, signatures of Darnielle’s poetics. As the decades have passed and the Mountain Goats have had bigger budgets and larger recording studios to work with, their sound has broadened. It’s also grown weirder. The band’s most recent album, Goths, offers a host of songs that defy genre norms and the musical expectations of die-hard fans, proving that Darnielle hasn’t stopped pushing creative boundaries decades into his career — even if it’s disconcerting to those who wish he’d stick to his voice, his guitar and a buzzing tape recorder. While his musical style has shifted in unexpected directions, the generous spirit that he brings to live performances remains consistent, and his shows are bound to draw out more than a few tears.