Don't be frightened, reader, at what you see on the title-page of this book, or at the head which I have given to my first chapter. Don't let the idea creep into your head, that I am going to give you a dull and sleepy essay on music. It is not the crotchets which you find in the singing-book, that I intend to talk about; I leave them to those who know more about them than I do.