Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Serious Error of Facts

This book contains the statement that Andrea Bocelli was laughed off the stage in Werther at Detroit's Michigan Opera Theater. I was there and I know that comment is not true. In fact, the performances of Werther were sold out. Opera News, published by the Metropolitan Opera Guild, gave Mr. Bocelli an excellent review. When a writer makes a statement which I know from personal knowledge to be untrue, I wonder if there are other errors in his book. I prefer to buy books which are more thoroughly researched.