Highly recommended for serious students as well as professionals. The book is packed with information, from repertoire (catagorized by instruments and/or accompanying ensemble) to information about equipment or biographies of well known players and instructors. Looking for a concerto other than the Vaughn-Williams? Then, this book is for you. It is also helpful with writing program notes. There is also a listing of disertation subjects. The book is well written (including a short history of the tuba by Bevan) and I consider it indispensible. My only criticism: there are no illustrations or plates. This, in my opinion, would be particularly helpful in the equipment/accessories section.