Cecilia Bartoli made it a habit as the artistic director of the Whitsun Festival of Salzburg: for every new edition since 2012, the mezzo-soprano incarnates a female role so that each year is the opportunity to present “a new facet of femininity”. And in order for the 2016 edition to match the 400th anniversary commemoration of William Shakespeare, Cecilia Bartoli chose  Romeo and Juliet for this lyrical event.    The author’s piece had obviously...