The song "Possession", which is on the flip-side, is the same as the version on the band's second single "Unconscious Power" as well as on the 1970 single release and is different from the version on the album Heavy. It is heavier in both its guitar and organ instrumentation than on the album version.
The song "Possession", featured on the flip-side, matches the version found on the band's second single "Unconscious Power" and the 1970 single release, differing from the one on the Heavy album. It boasts more intense guitar and organ playing compared to its album counterpart.