Nikolay Andreyevich Roslavets (1881-1944) was a Russian composer, music theorist, and teacher, known for his innovative approach to harmony and orchestration. He is often associated with the avant-garde movement in early 20th-century Russian music, blending elements of Russian folk music with modernist trends. Roslavets' genre encompasses classical music, with a focus on chamber and orchestral works. Notable compositions include his "String Quartet No. 2," "Sonata for Piano," and "Symphonic Poem," which showcase his unique use of dissonance and complex structures. His "Twelve-Tone Technique" predates and parallels the more well-known developments of the Second Viennese School. Despite facing challenges during the Soviet regime, which often stifled artistic expression, Roslavets' work influenced subsequent generations of composers in Russia and beyond. His emphasis on individual expression and innovative harmonic language contributed to the evolution of 20th-century music, earning him recognition as a precursor to later modernist trends. Today, Roslavets is celebrated for his contributions to music theory and his role in shaping the landscape of Russian avant-garde music.