Desperately in need of a detailed edit. The information is useful overall, but the history and physiology sections in section one suffers from excursions into pseudoscience (chapter 2) and the author seemingly being out of her depth in the mathematics of resonance and vocal acoustics (chapter 5).
Many interesting things in section 2, especially chapters 8 through 10 on vocal health and lifespan.
I wish there were more of the practical advice for instructors that appears in the concluding chapters.
The references and additional reading suggestions in each section are probably the best part, though sadly I will have to return my copy and have no desire to reproduce the lists.
(To do: actually get scoped to see if I am developing nodules, buy a TC Helicon or similar for my home live stream music studio, implement random varied exercises as part of home and lesson practice)