In this Opera Cheat Sheet, Houston Public Media’s Arts & Culture Director St.John Flynn and Eric Skelly of the River Oaks Chamber Orchestra discuss Vincenzo Bellini’s 1831 “lyric tragedy” Norma. Set in Gaul in the first century B.C., Norma tells a story of love, religion, fidelity and concealment as the Druids strive to fight off the invading Romans.