Cristina Sass, Adam Clough, and Autumn O'Ryan in Oklahoma!I'm tempted to say that the high point of the Circa '21 Dinner Playhouse's Oklahoma! comes in the show's first minute, when Adam Clough's Curly enters singing "Oh, What a Beautiful Mornin'" in a thrillingly rich, powerful baritone. Such a statement, however, might indicate that the rest of the actor's performance is somehow less of a thrill. Put simply - and with no disrespect meant to director Jay Berkow or the show's other participants - this Oklahoma! works because of Clough.