Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dr. Gray is like gold...

...you can listen to one set of tapes over and over again and they never lose their luster...you just learn more. This collection provides a great deal of insight on the views of both men and women in life, love, romance and sex. Dr. Gray is very direct and yet funny, but never overlooks the importance of explaining the true mechanics of the male and female mind, therefore helping us understand why we relate to one another in the ways we do. And better yet, with respect to both sexes, he explores compromise as one might normally overlook. Without a doubt, this cassette collection will be of irrelevant expense, with the everlasting impact on ALL of your relationships, friends, foe, and lovers.