Last year, New Zealand singer Lorde opened her third studio album, Solar Power, by outrightly rejecting the role that many fans have assigned to her on the internet as an omniscient guru/Messiah for millennials and Gen-Zers. “Well, if you’re looking for a savior, that’s not me,” she announced on “The Path.” No shade to the brilliant 26-year-old—the Lorde Hive is borderline cultish—but it’s SZA, a slightly older yet newer female voice in mainstream...