Linda Ronstadt (1977)
In 1977, Linda Ronstadt sang the Willie Nelson ballad "Crazy" at Jimmy Carter's inaugural concert. (If it seems like an odd choice for such an occasion, consider the fact that 15 years later, Ross Perot would adopt the Patsy Cline version as his campaign theme song.) Ronstadt, who performed on the campaign trail for Carter's one-time primary rival (and her sometime-boyfriend) California Governor Jerry Brown, later told Time magazine it was a tense assignment: "I was so nervous. My God, I was awful!"