Rousseau, Jean Jacques. (1712 - 1778) Dictionnaire de Musique8vo. (20. 5 x 13 cm). Vignette title page, XII, 547 pp., 13 foldout plates (A N; plate J was cancelled prior to printing). Contemporary full brown calf, heavily worn. Page edges marbled, joints rather weak, internally clean and otherwise fine. The Dictionnaire de Musique is seen as Rousseaus most significant work, and remains a valuable reference work today. Its primary focus was "to deal with terms relating to knowledge and technique, not only