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

Example Input: If you are not in really good shape this is a great product to get ready for P90X. It does get kind of boring because you are doing the same workouts every other day, but they do work. It is only about 30 mins but it is amazing how well it works.
Example Output: Positive

Example Input: London-born violinist and conductor John Georgiadis is in charge here, exhuming and enlivening long-forgotten dance music from the pen of Josef Strauss. After he was bulldozed into joining the family dance-music business, engineer-trained Josef (1827-1870) proved to be the most industrious of all the Strauss family during the remainder of his short life. I reckon, having collected and listened to all the volumes so far issued in this Marco Polo Josef Strauss Edition, that inspiration and innovation did not always keep up with his gruelling work schedule. Reliance on the family formula seems evident in most of the items on this CD, where you'll find a spanking little march, three waltzes, a quadrille and a variety of polkas, heard best at concert hall volume so that subtle lifts in rhythm and phrase and the skilful orchestration are heard to best advantage.
Example Output: Positive

Example Input: I purchase a Protect-A-Bed mattress cover at a mattress store, salesman said to wash it twice prior to use. He did not say to dry it with towels and sheets. Its supposed to be waterproof, one of our cats proved its not, contacted company, they asked if dried on medium with towels and other bedding, I said no, no one told me and not anywhere on package does it state needs to be protected in the dryer. Company sent another cover,this time on low setting which is mostly air fluff with towels and other sheets and it was scorched in 3 places. Both were scorched on medium and low heat, dryer is electric which is not as hot as gas. I'm getting my $90 back that I was charged at a mattress company. Not worth the money if you can't dry it because it has cheap plastic backing.
Example Output:
Negative