"Sgt. Pepper" was highly influential on bands in the US acid rock (or psychedelic rock) scene. Lavezzoli views it as a key factor in 1967's standing as the ""annus mirabilis"" for Indian classical music's acceptance in the West, with the genre having been fully absorbed into psychedelic music. "Sgt. Pepper" is commonly recognised as having originated progressive rock, due to the album's self-conscious lyrics, its studio experimentation, and its efforts to expand the barriers of conventional three-minute tracks. In addition to influencing Pink Floyd records such as "Atom Heart Mother", it was a source of inspiration for Robert Fripp when he formed King Crimson. The band's 1969 debut "In the Court of the Crimson King" was intended as a homage to "Sgt. Pepper".