DAMN COUNTRY MU(DLX)There's an edge, a defiance to the title of Damn Country Music that may not surface in the music, yet it still taps into the essence of Tim McGraw's appeal: he doesn't bother with crossover, he stays true to country and doesn't care who knows it. Thing is, McGraw's definition of country music is quite flexible, something Damn Country Music makes plain. Other singers who pledge allegiance to country music are often rooted in some kind of hardcore twang