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

Example Input: why am I being asked to review a product I didn't purchase. Need to fix the system or allow me to delete the request.
Example Output: Negative

Example Input: Phil Collins singing "Take Me Home" and Mark Knopfler performing "Brothers in Arms" and "Money for Nothing" are fantastic; heck, Elton, McCartney, Sting, Eric Clapton, Sting, Jimmy Buffett, Carl Perkins and Arrow are all great. This is a wonderful concert; I just wish I could have heard it in person.This DVD looks fantastic and sounds terrific--especially on a DTS capable system like mind. I buy music DVD's only if I can see that they have DTS encoding on the disk (Amazon please take note). However, in a few places--just a couple--the sound quality of "Music for Monserrat" falls down a wee bit compared to other music DVD's I have; otherwise, I would have rated it 5 stars.That said, this is a great DVD for those like me who love these artists.
Example Output: Positive

Example Input: Sure, this thing is definitely more cost-effective than an iPod. But with a low price, comes lower quality. Our special friends at Creative gave this thing good sound quality, great features, long battery life, and an unbeatable price. The catch is it's built like a piece of crap. It lasted about 1 1/2 weeks. I didn't abuse it, I charged it every day, but the headphone jack just sort of fizzled out. I tried re-setting it, I tried just about every pair of headphones in my house (10 pairs), and nothing worked. So I contacted customer service at Creative, but they said, "If the product seems broken, we cannot help," or something to that effect. Wow. Don't get me wrong, the thing was like heaven for about a week. If you want a quality mp3 player, splurge on an ipod. If you really need to save, buy this thing on Amazon, they eventually gave me a full refund. I bought myself an RCA mp3-cd player, and I'm happy with that until a cheap, worthwhile mp3 player coomes out.
Example Output:
Negative