What defines country music? The answer isn’t an easy one. Dolly Parton is undoubtedly singing a country-and-western song when she reminisces about “My Tennessee Mountain Home,” but how about when she’s warbling “Here You Come Again” by the Brill Building team of Barry Mann and Cynthia Weil? Are Shania Twain, Carrie Underwood and Taylor Swift country artists as pop stars, or pop stars as country artists? Billboard recently described none other than Bruce Springsteen as “a symbolic fencepost