April 17, 1970 was a big day for the United States—President Richard Nixon even described it as the “proudest day of [his] life and in the life of the country.” That afternoon, the ill-fated Apollo 13 crew splashed down in the Pacific Ocean and made it to safety. The nation breathed a collective sigh of relief.
But the day wasn’t over yet. That evening, President Nixon would sit in the East Room of the White House for another cultural milestone: a legendary performance by country music star Johnny Cash.