Plot: While acts such as Shania Twain or the Dixie Chicks sell millions, it's easy to forget that women's dominance in country has been an uphill struggle. ""Sweethearts of the Rodeo"" tells the story from the original cowgirl, Patsy Montana, to the outspoken big-haired icons of the '60s and '70s and today's stars including Gillian Welch