Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Author needs to lighten up.

First and foremost, I am a huge Metallica fan as the author states he is. With that said, I enjoy all of Metallica's music from every album with the exception of a couple of songs. Unlike the author however, I understand that musical styles change with time. The whole book is about the author complaining about Metallica's recent music and how it's not as heavy as the first three albums. Not worth the time to read.