Hermann L. F. Helmholtz, “On the Sensations of Tone (As a Physiological Basis for the Theory of Music)”, Alexander J. Ellis (trans.), 1863 was a nonfiction, science book on “Musicology” (music theory). Musicology focus is on the psychological, acoustical, and neurological aspects of music. The grouping of Linguistics, Psychology, Musicology, and Anthropology is often referred to as simply “Human Sciences”. Hermann Helmholtz, “On the Sensations of Tone”, 1863 is famous in the history of science, because the treatment is “hard” sciences (mathematics, physics, and physiology). Music students around the world cite this text often as a reference work.