Section 43

Section 43 was first recorded in 1966 and filled the second side of the band's June 1966 EP. It was recorded again for the first album on 6 February 1967 and runs 7:23. Rather than hold one groove, it moves between distinct sections. Melton said the manager, ED Denson, wanted to borrow the compositional structure of John Fahey, who wrote in discrete movements, and apply it to electric music. McDonald, an admirer of Fahey, said Fahey probably influenced the piece. Melton credited himself more than anyone with its raga flavor, citing Hamza El Din and Sandy Bull.

The album version was edited from three sections titled A, B and ragtime, which Charters faded out to complete silence. Melton said the two recordings share their structure and differ in the solos. Richie Unterberger wrote that the EP version, with its Asiatic guitar and tribal maracas, rivaled the Paul Butterfield Blues Band's East-West as the finest psychedelic instrumental ever. Uncut called the album version a psychedelic masterpiece assembled in movements. The band played it at the Monterey International Pop Festival on 17 June 1967, and a version was filmed for the concert movie.