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

[Q]: My 2 year old son is huge Thomas fan. This DVD has long introductions to each story in which children and adults are interviewed - my son couldn't care less. He just wants to see trains! We have a portable DVD player, and it is a big pain to try to fast forward past these introductions, and he (and I) just ends up frustrated. My advice - pick another DVD.
[A]: Negative


[Q]: If I could give this half of a star I would. I am a big fan of Nirvana, but this was a total disappointment to me. The tracks sounded awful. I felt like I was ripped off in every sense of the way. I took it to a buy-trade-sell place and not even they would offer me anything for it, which shows you the poor quality of this album. A word of advice; DO NOT BUY THIS!!!!!
[A]: Negative


[Q]: This is one of the best video concerts ever. The sound, visuals and performances are top notch. It is a real joy. I have owned it a week and watched it 3 times already. Every performance is good. There are no dead spots during this concert and you get quite a number of them. A keeper. Memorable.
[A]:
Positive