The title A Little Night Music is only the first of the many inspired elements of Stephen Sondheim’s inspired 1973 musical version of Ingmar Bergman’s Smiles of a Summer Night (or, more correctly translated, I’m told, Smiles of the Summer Night—i.e., the night of the summer solstice). Of course it calls up both Bergman’s most subtle comedy as well as Mozart’s most famous serenade. And although Sondheim’s stream of waltzes and other triple-meter dances more directly evolves from Viennese operetta than Viennese opera, there’s a consistent Mozartian elegance and chiaroscuro to this work. The high water mark of Sondheim’s career was probably in the 1970s, the decade of Company (1970), Follies (1971), Pacific Overtures (1976), and Sweeney Todd (1979), all collaborations with director Hal Prince. Everything that followed was more problematic, although many admirers would add Into the Woods (1987) to this list, and I’d also include the moving Passion (1994). Sondheim himself regards his Pulitzer Prize-winning Sunday in the Park with George (1984) as his best work.