Formed in 1989 as a Western-themed bluegrass band, the Dixie Chicks eventually became one of the most popular acts in contemporary country music, as well as the highest-selling female group in America. Beginning with 1998's Wide Open Spaces, they struck a balance between the commercial, radio-ready aesthetic of country-pop and the rootsy sound of neo-traditionalist country, a combination that helped distinguish the trio from such concurrent stars as Shania Twain. The Dixie Chicks further distanced themselves from country's conservative boundaries as their career progressed, al...