On Friday, Dmitri Hvorostovsky’s Facebook account had a play list called Viva Verdi. Works for me. Verdi was a baritone. His best roles were for baritones. He almost specialized in the emotional relationships between fathers and their children. There’s a good reason. Early in life, he lost his wife and his daughters. It nearly destroyed him. He turned his sorrow in to music. His greatest role, as we all know, is Rigoletto. Always, the greatest Verdi Baritone of Them All is the greatest of them all.