Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A masterpiece.

The Tchaikovsky Trio is a masterpiece -- one of the most beautiful pieces of chamber music ever written. Tchaikovsky wrote this work in memory of his mentor and friend Nicholas Rubinstein and -- perhaps for this highly-emotional reason -- he pored all of his considerable genius into it. If you are not familiar with this beautiful work please give it a try. You may find that you love it as much as I do. The Arensky Trio is less inspired and accounts for the four-star rating. The performances by the Rembrandt Trio are quite good -- especially in the case of the Tchaikovsky Trio.