Walter Gates was a prominent figure in the classical music world, best known for his work as a conductor and arranger. He had a significant influence on orchestral music, with a style that seamlessly blended traditional and contemporary elements. Gates was notably associated with the Philadelphia Orchestra, where he served as a conductor for many years. One of his most influential works was his arrangement of Gershwin's "Rhapsody in Blue," which showcased his innovative approach to orchestration.