Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great video!

"What a great video! This one is a lot of fun. I enjoy learning the waltz and all the other dances. With this video, you gain flexibility that can be very useful for other sports. Also, the lovely music, the calm and peaceful voice of the teacher make you forget about work, stress and exams. A special thank you to all the persons who create this video and the 3 other ones."