Beethoven branded Don Giovanni as frivolous, but as Wolfgang Amadeus Mozart wrote in a letter to his father in 1781: ‘For do you really suppose that I should write an opera-comique the same way as an opera-seria?’ For Mozart, Don Giovanni was an opera-buffa, though the much darker tones that underlie the comedic shenanigans make this an oddly complex psychological opera. This Northern Ireland Opera production wholeheartedly embraces the playfulness of Lorenzo da Ponte’s libretto. And, with a Titanic-esque luxury liner providing the setting for the unfolding action, complete with icebergs in the distance, it’s hard not to imagine that…