It was January 18, 2009, and 500,000 people huddled in the cold to watch a concert on the steps of the Lincoln Memorial two days before the inauguration of Barack Obama. They were treated to the words of some of our great actors and musical artists, people such as Tom Hanks, Denzel Washington, Beyoncé, and Bono. They were even treated to words from the president-elect himself. As the event came to a close, Pete Seeger and Bruce Springsteen led the crowd in a rendition of Woody Guthrie’s “This Land Is Your Land,” a song most of us think we know,...