Count Horn (bass Michael Callas) and Count Ribbing (bass David Cushing of Monument Beach, MA) in "Un ballo in maschera" ("The Masked Ball"). Opera Colorado's production of Verdi's "Masked Ball" opens at the Ellie Caulkins Opera House. The storyline origin
Jeffrey Dunn, Count Horn (bass Michael Callas) and Count Ribbing (bass David Cushing of Monument Beach, MA) in "Un ballo in maschera" ("The Masked Ball"). Opera Colorado's production of Verdi's "Masked Ball" opens at the Ellie Caulkins Opera House. The storyline origin, [434810957] . Denver Public Library Digital Collections, accessed 25/01/2026, https://digital.denverlibrary.org/nodes/view/869938