Jon Hassell (born March 22, 1937) is an American trumpeter, composer, and sound artist known for his innovative work in the realms of ambient, electronic, and world music. He is a pivotal figure in the development of "Fourth World" music, a term he coined to describe a fusion of traditional and contemporary sounds that transcends cultural boundaries. Hassell’s notable works include the albums "Vernal Equinox" (1977) and "Dream Theory in Malaya" (1981), where he blends elements of Indian classical music, minimalism, and avant-garde jazz, often using electronic processing to manipulate his trumpet sound. His collaboration with Brian Eno on the album "Fourth World, Vol. 1: Possible Musics" (1980) further cemented his influence, marrying ambient textures with global musical traditions. Hassell's impact extends beyond his recordings; he has influenced a wide range of artists across genres, including pop, jazz, and electronic music. His pioneering approach to sound and structure has left a lasting legacy, inspiring musicians to explore the intersection of technology and cultural expression.