Nicholas Maw’s new opera Sophie’s Choice has a star cast: “Sir Trevor Nunn to direct. Sir Simon Rattle to conduct. The dazzling Austrian mezzo Angelika Kirchschlager making her long-awaited London opera debut in the title role. Oh, and tickets so massively subsidised that the best seats in the house cost only £50.” Still, no one expected Sophie to be a hit, so it’s only playing five nights. And it’s become one of the season’s hottest tickets.