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:
iTunes has this exact album available for download on mp3 -- which means you don't have to wait for a CD and you can purchase individual selections. Sad to say that because I sooooo much prefer Amazon. They've been doing a great job in getting our oldies available to us... but need to do more... keep at it! I hope you think so as well.
Answer:
Negative