The spirit of Charles V hovers over Don Carlo. The four-act version of Verdi’s opera (it has a complicated production history) opens at the Holy Roman Emperor’s tomb. ‘He wanted to rule the world,’ a monk sings, ‘but forgot who assigns the stars their path in the sky. His pride was great, his madness immeasurable.’ In the finale, Charles V rises from the tomb to drag his grandson, the Infante Don Carlos, off to death.