Giuseppe Verdi (1813-1901) was the Shakespeare of opera, the composer of Rigoletto, Il Trovatore, La Traviata, Aida and Otello. The chorus of Hebrew slaves from Nabucco (1842) is regarded in Italy as virtually an alternative national anthem, and the great tragedian rounded off his career 50 years later with a rousing comedy, Falstaff. When Verdi was born, much of northern Italy was under Napoleonic...