Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The La Scala Encyclopedia of Opera

This is a comprehensive volume, giving descriptions of all western operas, composers and major performers. It is not as detailed as Leslie Orrey's Encyclopedia of Opera, but more friendly for the TV age user (and our shorter attention spans). Each page contains 1-2 photos or prints of people, places and sets along with text. Overall a great volume to have if you are new to opera and want a quick reference for story lines and stars.