Note that in Ricordi vocal scores (both the standard one that has been around for decades and the new Critical Edition published in association with University of Chicago Press) there is a mistake in printing the names of Marullo and Ceprano next to the wrong lines of music for the few pages between the two verses of the Duca's cabaletta (Act 2). It's obvious what's wrong and I've corrected it in this recording. The Schirmer vocal score is correct here, as is the full orchestral score.