On Thursday, March 16 at 7:30 pm, American Masters airs a documentary about Patsy Cline. During an unfortunately brief career, she became one of country's biggest stars. Hit songs like "Walkin After Midnight," "I Fall to Pieces," and "Crazy" amassed crossover success, appearing on both country and pop charts. She was also a trailblazer for female country performers, broke gender norms, and was an important mentor to younger stars. How well do you know the inimitable singer?