Given the task definition and input, reply with output. Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

If you buy concerts on DVD because of the great sound, skip this one. I was amazed that George Martin and all those experienced players allowed such an amateurish recording to happen. Some of the performances were disappointing: Mark Knoffler seemed to be drunk and/or on autopilot, Paul McCartney made my throat sore hearing him attempt to hit high notes that he can't quite manage anymore.
Negative