Charles-Joseph-Balthazar Sohier (also known as Charles Sohier) was a French composer and music theorist born in 1780 and active during the early 19th century. Primarily known for his contributions to the genres of classical and chamber music, Sohier was particularly recognized for his compositions for wind instruments, which showcased his innovative approach to orchestration. Notable works include his "Sextuor" for wind instruments and various chamber pieces that highlight the capabilities of brass and woodwind ensembles. His compositions often blended lyrical melodies with intricate harmonies, reflecting the transitional style between the Classical and Romantic periods. Sohier's impact on music lies in his role in expanding the repertoire for wind instruments, which was relatively underdeveloped at the time. He contributed to the evolution of instrumental music and influenced subsequent composers in the realm of chamber music. His theoretical writings also provided insights into the practice and pedagogy of music, aiding in the education of future musicians. Though not widely known today, Sohier played a significant role in the development of 19th-century French music, particularly within the context of ensemble performance.