Benjamin Britten's War Requiem, written in response to the devastation of both World Wars, premiered in 1962. Getty Images hide caption

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The love of a woman strains the friendship between two fishermen in Bizet's lesser-known opera. Wikimedia Commons hide caption

itoggle caption Wikimedia Commons

Tenor Placido Domingo switches to the baritone register to sing the title role in Verdi’s Simon Boccanegra last month at the BBC Proms Concerts. Chris Christodoulou/BBC hide caption

itoggle caption Chris Christodoulou/BBC