author
1866–1950
A longtime music theorist and teacher at the Oberlin Conservatory of Music, he wrote clear, practical textbooks that helped students learn harmony, counterpoint, and musical form. His books were designed for the classroom, but they still offer a direct window into how music theory was taught in the early 20th century.

by Friedrich J. (Friedrich Johann) Lehmann
Friedrich J. Lehmann, also listed as Friedrich Johann Lehmann, was a music teacher and author born in 1866 and died in 1950. Contemporary library and book records connect him with the Oberlin Conservatory of Music, where he served as an instructor or professor of theory.
He is best known for instructional works such as A Treatise on Simple Counterpoint in Forty Lessons and Harmonic Analysis. These books were written as practical teaching texts, with a step-by-step approach aimed at students building solid technique in harmony and counterpoint.
Although not widely remembered as a public figure today, Lehmann’s writing has lasted through library collections and public-domain editions. His work reflects a careful, methodical style of music education and remains of interest to readers exploring the history of theory teaching in American conservatories.