An American institution, Sun Records has a history with many chapters -- its Memphis origins with visionary Sam Phillips, the breakthrough recordings of Elvis Presley, and the studio's immense influence on the sound of popular music. But behind the company's chart toppers and legendary musicians there exists another story, told by Barbara Barnes Sims. In the male-dominated workforce of the 1950s, 24-year-old Sims found herself thriving in the demanding roles of publicist and sales promotion coordinator at Sun Records. Sims's job placed her in the studio with Johnny Cash, Roy Orbison, Jerry...