Definition: Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Input: I can not say enough about Nightwish, masterpeice in all meanings of the word. If I had to chose one CD to be stranded with on a desert island, this is it! All Nighwish is good but this is there greatest, and most epic. Tarja has the most amazing voice, and makes this metal in a catagory all it's own. You have just got to hear it, I can explain the way this album can make you feel. The classical of the future!
Output:
Positive