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In welcoming the erotic on stage, the waltz-based Viennese operettas liberated all forms of theater.

He was the composer half of Gilbert and Sullivan, the Lennon-McCartney of sprightly operettas, back when operettas were both the movies and the pop music of their day — the must-see shows, the must-sing songs.

Gilbert and Sullivan created 13 operettas that are still performed today, but the manuscript for Utopia Limited has been lost.

The production history of “Candide,” Leonard Bernstein’s operetta based on Voltaire’s novel, is as epic as the highs and lows of its title character’s journey in a volatile and menacing world.

Wilson recently conducted two performances of the Gilbert and Sullivan operetta “Princess Ida” on period instruments, with “tiny trombones and cornets and gut strings and everything.”