Assertion: italian libretto | /r/CreatedBy | salvadore cammarano
Facets:
value: largely
type: DEGREE
Source sentences:
text: Il trovatore ('The Troubadour') is an opera in four acts by Giuseppe Verdi to an Italian libretto largely written by Salvadore Cammarano, based on the play El trovador (1836) by Antonio García Gutiérrez.