Instruct: Classify a given review into positive or negative sentiment.
Query: do NOT buy this!!!

This movie is simply bad. I looks like some stupid high school project! The picture quality is terrible, and so is the sound. The riffs were refered to as #1, #2, #3, etc. I don't think this movie would be helpful to either a beginner or advanced guitarist. Each riff was only played twice, the instructor did not explain how to do them (what, they think we're going to look at the screen for a total of 10 seconds for each riff and learn it???), the film shows that the instructor did not have much rehearsing, and it's extremely boring. I didn't find this movie helpful what so ever.