Adam Sweeting assesses how the Dixie Chicks have weathered a political storm Will it be the salmon teriyaki with organic greens, or asparagus tempura and tuna sashimi? As the waiter hovers with pencil poised, the Dixie Chicks debate the menu with the practised air of professional restaurant critics. The Chicks have traditionally been branded a country band, but clearly it's some time since their diet consisted of ribs, tacos and pancakes. Sisters Emily Robison and Martie Maguire project a polished Fifth Avenue elegance, and vocalist Natalie Maines is a vision of sculpted cheekbones and smoky eye-shadow. With their origins as...