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

[Q]: The title of this video mentions Argentine Tango. Unfortunately, what is being taught on this tape is not authentic Argentine Tango. Not even close. It's ballroom tango. There is a huge difference: in music, style, steps, posture, etc... Don't be fooled by ballroom instructors trying to teach Argentine Tango. The only authentic instruction available on the market comes from authentic Argentine instructors from Buenos Aires.
[A]: Negative


[Q]: If you need a grammar reference, this may well serve until you find a better one. It might be of greater utility if the tone wasn't vaguely condescending and pedantic, and it eschews the panoply of actual examples in favor of definitions. To wit: the 2nd person singular present perfect conjugation of "to love" results in "If you have been loved..." gives me one (singular) example but not the rationale of when to use this. The density of the text preceding the example conjugations will require your own self-study to master (if you must) the ability to spin off a subjunctive 3rd person plural present tense conjugation.The best recommendation I can offer for this is as a companion for language learners who need a quick reference for English analogs of other-language conjugations, such as when you try to conjugate "falar" and need to know which one to use.--#
[A]: Negative


[Q]: I you are new fan who doesn't know which one of the countless Motoralbums to purchase first then look no further... "Overkill" was the first album to get the public's attention. It features concert regular classics such as "Metropolis", "Stay Clean" and the overkilling title-track.This edition of "Overkill" includes an interesting batch of bonus tracks such as the Kinks cover "Louie Louie" which was Motorhead's first hit single.All the tracks on this album are headbanging gems and now it is 50% extended. Get it, it's a good choice.
[A]:
Positive