Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Metallica's Best Album Ever!

This album was a extreme change in Metallica's musical style. It combined the heavy metal of the early years with the unique sound of the classical guitar. End result? A beautiful sound with a dark theme. Songs like "Enter Sandman", "The Unforgiven", and especially "Nothing Else Matters" really send chills down my spine. "The Black Album" should have been their last album because it would have been a great way to end their illustrious career. At any rate, this album is a must for anyone who likes heavy metal, Metallica, or even classical music!