Cardillo's richly scored and still popular 1911 romance Core 'ngrato (Ungrateful Heart) — also known by its lyric Catarì, Catarì, pecchè me dici sti parole amare — was written in America to a text in Neapolitan dialect by Alessandro Sisca; it is in fact the only famous Neapolitan song by an Italian-American immigrant.
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Franco Corelli, Luciano Pavarotti, Plácido Domingo, José Carreras and, more recently, Roberto Alagna and Jonas Kaufmann are among the tenors to have included Core 'ngrato in their repertories.
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