Sean Nicholas Savage has worn many costumes throughout his career. The Montreal-based vocalist, songwriter, and producer made albums of nicely tailored indie smoothness that took cues from ’80s R&B and soft rock radio hits before eventually moving his focus to penning and putting on multiple presentations of musical theater in the early 2020s. His solo output has reflected this refinement, with 2020’s Life Is Crazy and 2022’s Mac Demarco-produced Shine both choosing gentler, sophisticated arrangements that forewent drums in favor of either aching arrangements of piano and strings or stripped-down songs led by acoustic guitar. With The Knowing, Savage continues down the path he’s been on for the last few albums before it, but occasionally…