Johann Friedrich Gottlieb Beckmann (1737–1811) was a German composer and music theorist, primarily associated with the transition from the Baroque to the Classical period. His work reflects the stylistic shifts of the time, blending elements of the late Baroque with early Classical forms. Beckmann is known for his contributions to instrumental music, particularly chamber works and symphonies. Notable compositions include his string quartets and symphonies, which showcase clarity of structure and melodic invention, typical of the emerging Classical style. His treatise on music theory, "Versuch einer Anleitung zur Composition" (A Guide to Composition), further emphasizes his impact on music education and theory during his era. While not as widely recognized as contemporaries like Haydn or Mozart, Beckmann's work contributed to the development of musical form and composition, influencing future generations of composers. His writings and compositions played a role in the evolution of music theory, making him a significant figure in the context of 18th-century music.