John Ockeghem (c. 1410–1497) was a prominent composer of the late Middle Ages, primarily recognized for his contributions to the genre of polyphonic choral music. He is often associated with the Franco-Flemish school and is regarded as one of the most significant figures in the development of the Renaissance style. Ockeghem's notable works include his masses, such as the "Missa prolationum" and "Missa caput," which are celebrated for their intricate counterpoint and innovative use of musical form. He also composed numerous motets and chansons, showcasing his versatility in vocal composition. Ockeghem's music had a profound impact on subsequent generations of composers, influencing the likes of Josquin des Prez and the broader evolution of polyphony. His techniques in rhythm and harmony laid the groundwork for the complex structures that would characterize later Renaissance music. Ockeghem's legacy endures as a pivotal figure in the transition from medieval to Renaissance music, marking him as a key architect in the development of Western art music.