The product is a vintage 1961 hardcover textbook titled "Twentieth-Century Harmony: Creative Aspects and Practice" by author Vincent Persichetti. Published by Norton & Company, Incorporated, the book falls under the subject area of music, specifically focusing on instruction and study of music theory. It is 288 pages long and written in English, making it suitable for adult and further education levels, with beginner to intermediate levels of music proficiency. The book also includes a dust jacket and is a valuable resource for those interested in the history and practice of 20th-century music harmony.