Instruct: Classify a given review into positive or negative sentiment.
Query: a classic

One of the finest music films I have ever seen. Berlinger and Sinofsky have struck gold with this intimate look at men in crisis. Who would have ever thought a band like Metallica would open themselves up in such a painful way. I couldn't believe what I was seeing. A mixture of humor and high drama makes this one of the most amazing film experiences I have ever had. A must buy.