After two decades of marriage and duets, country music’s power couple make their first joint album. With sugarcoated lullabies (“Sleeping in the Stars”) and tender tributes to long-haul love (“Damn Good at Holding On,” “The Rest of Our Life”), it’s a best-of-times portrait of a blissful marriage that seems fit for a black-and-white Hollywood flick. You’ve got to hand it to them: their wistful harmonies and impassioned hooks feel burning and sincere. In the Hill-McGraw household, maybe dancing in wheat fields under a half-moon is just another Friday night.