I took this book in order to learn more about controlling my voices. It did a great job on teaching me the basics and putting a name to certain effects which I couldn’t put a finger on or phrase previously. It is recommended to use the book with a teacher and I can see why, however I, as an absolute beginner found myself motivated to do more research and start improving my voice. The effect would be much bigger with a guided approach. In any case, I recommend it further. Four stars, because sometimes I found it hard to follow the structure.