I have been a Dixie Chicks fan since the early noughties, when I realized that there was more to country music than the country-pop crossover hits by Shania Twain, Faith Hill and LeAnn Rimes. Back then, the American band, composed of Natalie Maines, Emily Robison (now called Strayer) and Martie Maguire, was on the top of the US country music charts, and their albums were selling millions of copies. Then, in 2003, the US invaded Iraq, and the Chicks (as they’re currently called) embarked on their Top of the World Tour, came to London, and the rest is history. Fast forward 17 years later, the trio has just released ‘Gaslighter’,…