John Erskine (born February 21, 1889 – died December 2, 1951) was an American composer, pianist, and conductor, primarily known for his contributions to classical and popular music. He was also an influential educator and writer, significantly impacting music theory and pedagogy. Erskine studied at the Juilliard School and later became a faculty member, where he helped shape the curriculum for future musicians. He is best known for his works such as the orchestral piece "Symphony in E minor" and the piano composition "The Four Seasons," which blend classical techniques with contemporary idioms. Beyond his compositions, Erskine was a prominent figure in the early 20th-century American music scene, contributing to the popularization of classical music. He wrote extensively on music, including essays that explored the relationship between music and culture. His work helped bridge the gap between classical traditions and modern American musical forms, influencing subsequent generations of musicians and composers. Erskine's legacy endures through his compositions, writings, and his role in elevating American classical music during a transformative era in the arts.