Instruct: Classify a given review as either positive or negative.
Query: This book wasted a lot of my time

After deciding to teach myself to sing, this was the first book I tried. Now, about 3 years and numerous other books later, I look back at the advice contained in this book and get very angry. Primarily this is because I now know that for me crucial parts of the advice contained is so seriously wrong, most notably the instruction on how to breath.Having finally managed to shake off the breathing habits learnt from Appell, I am starting to make good progress with other books which is why I feel qualified to advise you away from here.