If indie-rock artist Julien Baker’s conversational, earnest debut was a whispered sleepover confessional, this year’s Little Oblivions feels like growing up and graduating to screaming your feelings across a crowded club. The layers of bass, synth and pounding drums on Oblivions are a sonic revolution for Baker, who’s always seemed most comfortable with nothing more than her voice and a guitar — but she’s entirely at home here. The emotional intensity she’s brought since Day 1 has found its aural equal.