Based on Victor Hugo’s play Le roi s’amuse, Giuseppe Verdi’s Rigoletto was a triumph when it premiered at La Fenice in Venice in 1851, and has remained one of the composer’s most frequently performed operas ever since. Its popularity is thoroughly deserved but might still be deemed interesting, given that it is a contender for the cruellest opera in the mainstream repertoire. While many works see the innocent suffer and die, there is usually a sense in which...