I used Ear-training and Sight-singing as a text book when I took high school Theory I and II thirty-five years ago. When I heard they were retiring the books, I pleaded for and received a tired, old copy which I cherish to this day. Of all of the sight-singing and ear training books I own, this is by far the most valuable. George A. Wedge is the "Earnest Hemingway" of musical authors. He presents the subject matter in plain, clear language without a wasted word. He simplifies the fairly abstract ideas and presents them to reader in very comprehensive terms. He begins with the most simple concepts, providing a solid foundation, then continually builds on those in a way that allows the reader to have continual epiphanies. To master this book is to master your craft.