Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The CD's alone are worth the cost of this book!

I've owned this book for several years now. I take weekly vocal lessons, but whenever I start daily practice with the CD's everyone notices a tremendous improvement in my sing ability. The exercises are great! Regular practice helps strengthens your diaphragm muscles, the foundation of good singing, as well as increasing your range. I don't know that I would make use of everything in the book, but I would buy the book for the CD's. As one singer once said: "If I skip a day of practicing I know it. Two days, the critics know it. Three days, the audience can tell." These CD's are great for daily practicing, even if you do it in the car.