This book makes some good points, but the author is quite opinionated (for example, his view is the "correct" view of what a good recording is) so that his advice is misleading. He also does an obsessional counting of words in the TRANSLATION of the Ring, which is not very useful since the original is in German and different translators render Wagner's words differently. I read the book through once and never returned to it, which says something about its usefulness. In contrast, for example, the books by Bryan Magee, I return to again and again for fresh insights into the Ring. Overall, this book is a disappointment and probably not worth buying. It will just take up space on your bookshelf.