Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Let me give you an example: I've read this book with much expectation, it was very boring all through out the book
The answer to this example can be: Negative
Here is why: Review writer does not like the book because it was boring, therefore it is a negative review.

OK. solve this:
Wow, I just bought this CD and I was surprised to see how poorly reviewed it was. Actually, that is the primary reason for my participation in this review... to offer a positive and encouraging reason to purchase this compact disc. I found the music to be refreshing and beautiful and, despite what other reviews have said, found the musicians to be quite talented. It's a good CD to relax to, have a dinner party to, et cetera. It's not REM, don't expect to hear REM. It is, however, a string quartet who brings a refreshing twist to most of REM's popular songs.
Answer:
Positive