Instruct: Classify Amazon reviews into positive or negative sentiment
Query: War and Peace is a great masterpiece

War and Peace is a beautiful book written about Napoleon's invasion of Russia. Leo Tolstoy's mastery of language is shown as he ties the lives of five Russian families into the history of the war. This book is written in a way that allows the reader to be comfortable. With the details of people's lives and the action of war in the background this book is not a bore. War and Peace is a must have for the library of any avid reader.