The Holy Modal Rounders was an American folk music group, originally the duo of Peter Stampfel and Steve Weber, who formed in 1963 on the Lower East Side of New York City. Although the band was not initially successful, they quickly earned a dedicated cult following and have been retrospectively praised for their pioneering innovation in several genres related to folk music. They also proved to be influential, both during their initial run and to a new generation of musicians like Yo La Tengo and Espers.

Psychedelic folk is a loosely defined form of psychedelia that originated in the 1960s. It retains the largely acoustic instrumentation of folk, but adds musical elements common to psychedelic music.