Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent book for the performer

I bought this book, because I love figure-skating, and I was interested in entering an amateur competition. This book was extremely helpful to me for the competition, and for my ice-skating hobby in general. However, the principles in this book apply to musical performance, too. I'm a flutist, and I teach at a State College, so I gave a lecture on the book and how useful its principles are to the entire music department. To my surprise, the whole basketball team and its coaches showed up to my lecture, too.