NASHVILLE, Tenn. (AP) — The backstage of the Grand Ole Opry, a radio staple since 1925, is a place where you might run into your favorite country star, drop a letter in a singer's mailbox or take a peek inside a dressing room where an impromptu jam session is happening.

Every year, 1 million people come to the Opry House in Nashville, Tennessee, to see a performance, or event, or take one of the backstage tours that allow fans to see behind the red curtain on the "show that made country music famous."

And a new feature this year on those tours is an immersive film that explains the history of...