Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
One example: I've read this book with much expectation, it was very boring all through out the book
Solution is here: Negative
Explanation: Review writer does not like the book because it was boring, therefore it is a negative review.

Now, solve this: The Pitchshifter sound that has been forged over their last 5 or so releases, culminating wonderfully with "www.pitchshifter.com" has here been stripped to a watered-down sound that could have come from any of 1,000 other bands who are wasting our time (and money) these days. The Pitchshifter formula of brutal guitars mixed with programed drums and other industrial and electronic affects was unlike anything else on the musical scene. That sound is completely gone on this CD--reducing their punishing onslaught to something that MTV would have little problem broadcasting. A very disappointing CD.
Solution:
Negative