Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A good production of a less known Opera

This is a very enjoyable production of Verdi's Stiffelio. It is well sung and well acted, especially by Carreras. Very well conducted by Edward Downes. The sets are good, not brilliant. The music is what it is, one of Verdi's less-known Operas, which any real enthusiast of his music will like. The image quality is on the poor side for that period but the sound is fine.