Cross Canadian Ragweed, Kathy Mattea and Tim O’Brien have been announced as performers at the Americana Music Festival and Conference on Sept. 17-20 in Nashville. Marcia Ball, Band of Heathens, Folk Uke and Langhorne Slim have also been added to the lineup. Previously announced performers include James McMurtry, Jason & the Scorchers, the Belleville Outfit, Jim White, Paul Thorn, the SteelDrivers and the Snake the Cross and the Crown.