Worker: Which opera original produces in 1831 by Vincenzo Bellini?
Vincenzo Negrini: Vincenzo Negrini (born Vincenzo Bartolomeo Trentanove) (24 August 1804 – 16 August 1840) was an Italian bass-baritone opera singer. Vincenzo Negrini:  Born in Cesena, he sang leading bass and baritone roles in Italy's major opera houses and created several roles in early 19th-century operas, most notably Oroveso in Bellini's "Norma" and Folco in Donizetti's "Ugo, conte di Parigi". Norma (opera): Norma (] ) is a "tragedia lirica" or opera in two acts by Vincenzo Bellini with libretto by Felice Romani after "Norma, ou L'infanticide" ("Norma, or The Infanticide") by Alexandre Soumet.
i don't know