Mavis Staples and the folk supergroup I’m With Her were validated as the class of the Americana field at the Grammy Awards on Sunday, while the prime time broadcast sidelined roots music just when Americans need it most. Interest in folk, hard country, and bluegrass seem on the rise in the marketplace, but you wouldn’t know it from the almost eight hours of ceremony split between an afternoon online segment and what’s now known to be CBS’s final network broadcast of the Recording Academy’s signature event.