The purpose of this book is to act as a kind of guide to these songs. When we look around, say, a city, we often do so guide book in hand; its function to point out the places of interest, to tell us something about them and to put them in a context. In short, guide books help us to enjoy our visit. This is how I intend this book to be used. I hope that by reading what I've written about particular songs or albums the listener will hear details that he or she had perhaps not notices before, or come to understand better the connection between the details.