Love is in the air, and there’s no time to waste planning this year's Valentine’s Day celebration. Handwritten card? Check. Cute Instagram post complete with a V-Day quote? Done. Dinner reservations?

“Hit Me Hard and Soft,” her third album, is both concise and far-reaching. By Jon Pareles “Twenty-one took a lifetime,” Billie Eilish, 22, sings in “Skinny,” the song that opens her third album, “Hit ...