At the opening night for the Circa '21 Dinner Playhouse's Ring of Fire, the show began with its eight-person cast, one by one, declaring, “I am Johnny Cash.” Throughout the performance, they all at some point embodied the spirit of “The Man in Black.” And while the production boasts a 34-song set list covering much of Cash’s long songwriting career, I use the phrase “set list” intentionally, because the production does feel more like a concert than a traditional musical.