Knoxville Opera is set to present “Opera’s Greatest Hits: A Tribute to Robert Lyall”on Sept. 22, 2024. The event will be conducted by Francis Graffo and will feature such vocalists as Michael Chioldi, Hannah Ludwig, Murrella Parton, John Pickle, Scott Purcell, Renée Tatum, David Weigel, Cody Boling, Jacqueline Brecheen, Joel Brown, Lauren Boozer, Staley Clark, Tori Franklin, and John Overholt {…}