Fourth World, Vol. 1: Possible Musics is an album by Jon Hassell and Brian Eno. It was recorded at Celestial Sounds in New York City and released in 1980 by Editions EG, an imprint label of E.G. Records. "Fourth world music" is a musical aesthetic described by Hassell as "a unified primitive/futuristic sound combining features of world ethnic styles with advanced electronic techniques." The album received praise from many critics.

Dream Theory in Malaya: Fourth World Volume Two is an album by Jon Hassell, released in 1981. It is the sequel to his collaboration with Brian Eno, Fourth World Vol. 1: Possible Musics, which was released the previous year. The recording draws influence from the culture of the Senoi people of Malaya.