The dramatic intensity at the heart of Romeo and Juliet’s theme is such that not only can it travel in the Western culture from Shakespeare to Bernstein being reborn in each generation, but it also survives, almost intact, the heavy bel canto rhetoric.  Build upon Felice Romani’s inflamed verses up to a cliché, which at no point come from the Shakespearian referent (we only wish they did), I Capuleti e i Montecchi is still an imperfect Bellini that, although...