“L’Ange de Nisida (The Angel of Nisida) – composed in the late 1830s after [Donizetti] moved to work in Paris – never saw the light of day. It was written for the city’s Théâtre de la Renaissance, but the company went bankrupt before it was premiered. The opera was thought to have been lost until musicologist Dr Candida Mantica … painstakingly located and deciphered the score’s fragments over eight years. … The work will be premiered on 18 July at Covent Garden by London-based Opera Rara.”