Hi, does anyone know any famous country singers like Tim McGraw, Toby Keith, Kenny Chesney, Garth Brooks etc?

I'd like to try and interview them briefly for a book I'm writing about the influence of Mexico and its culture on country music. I have done 42 interviews with well-known country artists, including: Ray Price, Bobby Bare, David Ball, Eddy Raven, George Ducas, Jessi Colter, Holly Dunn, Kevin Fowler, Robert Earl Keen, Dale Watson, Cory Morrow, Gene Watson, Guy Clark, Johnny Bush etc, but a real superstar known outside of country music circles still eludes me. I have tried contacting managers, publicists, record company people etc, but have had no luck. I would REALLY appreciate some help...I know it's a long shot, but I'm running out of ideas! Thanks.