“Casta Diva” (Chaste Goddess) is the most famous aria of Vincenzo Bellini’s “Norma” (1831). It is sung by the title character, a Druidess or priestess of the Gauls, in the first act. The opera takes place in Gaul between 100 and 50 BC when the Romans were occupiers. The Gauls want Norma to declare war […]