존 필드 (John Field) was an Irish composer and pianist, born in 1782 and known for his contributions to the Romantic music era. He is particularly recognized for developing the nocturne genre, which features expressive melodies and rich harmonies. Field's works often reflect a lyrical and emotional style, influencing later composers like Frédéric Chopin. Field spent much of his life in Russia, where he gained popularity as a performer and teacher. His compositions, including numerous piano pieces, showcase his innovative approach to melody and form. He passed away in 1837, leaving a lasting legacy in classical music.