Instruct: Classify an Amazon review into positive or negative sentiment.
Query: AN OPERA OPUS THAT'S A MUST!

Oh, such letter-perfect perfection! This marvel features a two-hour-plus showcase of well-known arias from "Cosi Fan Tuti," "Aida," "Carmen," "Madame Butterfly" and "The Barber of Seville." It also comes with a book --- 762 pages of remarkable facts, figures and illustrations.Encore!