Part 4 of the Intermezzo by Pergolesi, with Anna Moffo (Serpina), Paolo Montarsolo (Uberto), Giancarlo Cobelli (Vespone). English subtitles added. Recitative and Aria, "A Serpina penserete." The aria begins at 3:50. This is the beginning of Intermezzo II (or the second act).
Watch videos with other singers performing A Serpina penserete: