Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bad sound quality

I love to listen to Andres Segovia and John Williams and have listen to many recordings from their catalogue. However, this CD was a real disappointment: soundwise. Especially the last tracks with Andres Segovia. It seems that the mastering engineer has used a bad tape machine where speed is fluctuating up and down. Also, the volume goes up and down on segovia's tracks. When it comes to the first tracks with John Williams there is no ambience at all. It sounds that John Williams is playing in a bed room. I really wonder if John Williamns has approved this CD? This CD is a disappointment for me: soundwise. It doesn't have the standard of a good quality classical production with two of the most well-known classical guitarists of all the time.