This is the clearest explanation I have ever read of the basic mechanics and physiology of singing. The authors avoid any medical or scientific jargon, yet what they say checks out when read by someone who also knows that jargon. They put their extensive clinical experience at the service of the reader without ever claiming too much certainty and with constant respect for the variability of voices and circumstances. All the while, they don't try to make the book a substitute for a doctor or a voice teacher, a temptation not avoided by everyone who writes about these topics. Dr. Jahn and Dr. Cho are experts both musically and medically, and have the additional gift of writing in straightforward English, with a good sense of narrative and crystal-clear organization. Every singer should read what they have to say.