content: I am a vocal method aficionado, and Jeffrey Allen has put forth an impressive effort. He groups each of the exercises into a section dealing with a different part of vocal technique, along with visualizations. The visualizations are probably the most interesting part of his program, and they actually work. This is a big book, that actually applies to all styles of music from rock to musical theatre. The idea behind this book is that it gives you a solid foundation of technique to tackle any vocal challenge. The appendices that go into detail on the different aspects of the voice are invaluable and explain how the singing voice works in a detailed way. Buy It!