Psychedelic music is a term referring to different music styles and genres, such as psychedelic rock, psychedelic folk, psychedelic pop, psychedelic soul, psychedelic ambient, psychedelic trance, psychedelic techno, and others. Often people use the words acid rock to refer to the more intense and loud forms of psychedelic rock, particularly many of the jam bands and heavy rock groups of the late 1960s. Psychedelic music can apply to almost any kind of music, even classical.