 For most of its first fifty years, Cincinnati Opera's performances were held at the Cincinnati Zoo Pavilion.During that time, many prominent singers appeared in the company's productions including Plácido Domingo, Beverly Sills, Norman Treigle, Sherrill Milnes, Montserrat Caballé, Jan Peerce, Robert Merrill, Roberta Peters, Shirley Verrett, Lawrence Tibbett, Richard Tucker, Martina Arroyo, James Morris, Elinor Ross and Barbara Daniels.In 1972, Cincinnati Opera moved its performance base to Cincinnati Music Hall, a 3,417-seat theater listed as a National Historic Landmark by the U.S. Department of the Interior.