"Harmony Materials in Tonal Music: A Programmed Course Part 1 & 2 by Paul O. Harder is a comprehensive textbook series that delves into the subject area of music, specifically focusing on harmonic materials in tonal music. Published by Allyn & Bacon Computer Books in 1968, this trade paperback book spans 389 pages and covers advanced topics suitable for adult and further education levels. With the author's expertise and detailed explanations, this textbook serves as a valuable resource for those looking to deepen their understanding of music theory and improve their skills in tonal music."
