Instruct: Classify Amazon reviews into positive or negative sentiment
Query: J K Rowling is a genius.

Harry is growing up in this book. He has to deal with more than ever, and the tale is both beautiful and tragic. I have read the other four books in the series to my 4 and 5 year old children, but as the subjects in this book are rather over their heads at this time they will have to wait a few years before they read Order of the Phoenix. I highly recomend this book for anyone that has read the other 4 books in the series. It is truly a brilliant book!