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

Example Input: Wow..thats basically all i can say. I bought the cd, then realized that they were playin live like 20 minutes from my house. They put on an amazing show! They closed it with do you call my name, then went backstage. The crowd started chanting, "ONE MORE SONG!!" The drummer came out and started playing again. Then all the rest came back out and played one last song. Ra is underrated and a great bunch of guys. I got my cd autographed by all 4 and i got a picture with them. Buy From One, Duality, and SEE THEM LIVE!! My ears are still ringing.
Example Output: Positive

Example Input: not bad but be warned you need to buy extra play-doh at local store before handing it to the kid's
Example Output: Positive

Example Input: I was upgrading from a Sandisk Sansa e280 4GB unit. This unit does a better job playing everything (audio and videos) and with a larger screen and longer battery life, I was sold. I think this unit is a great option if you want to avoid ipod and itunes.
Example Output:
Positive