Eileen is amazing and this book is her first. Start with this book first and learn everything you can about energy then move onto her second book Electric Body, Electric Health. Eileen has spent years working with tuning forks on the body of her clients and has understood sound from trial and error. I am so grateful that she is willing to share this knowledge with us all.
Both books have a wealth of knowledge about tuning forks and how sound affects the body. I am still reading her books and learning new stuff all the time.
Once you have completed both books try Eileen's new course, Electric Body. To really understand how tuning forks work listen to Eileen, really listen and learn.