DAVID BIANCULLI, BYLINE: This is FRESH AIR. I'm David Bianculli, editor of the website TV Worth Watching, sitting in for Terry Gross. "The Carol Burnett Show," one of TV's classic variety shows, ran on CBS from 1967 to 1978. In terms of musical variety, it's a significant chapter in TV history. Carol admired the work of Sid Caesar on TV's first great sketch series, "Your Show Of Shows," at the start of the '50s.