Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Negative surprise after opening CD

I was inspired to purchase Cantata 78 (included in this product) from an exceptional performance on a Public Radio station. Because I was driving I could not copy the recording information. From the information provided by Amazon, I could not tell prior to purchase that the selections were performed on original instruments which I do not prefer, and that a countertenor was substituted for the contralto. The noticeable difference in voice quality is unacceptable. The performance is generally thin and the choir appeared to be reduced in size. I will buy no more products from Amazon unless I have heard the specific recording. But I have spent $17 and am unable to return the product which I will now seldom listen to.