Procol's Ninth is the eighth studio album (ninth including Live) by Procol Harum, that was released in September 1975. Produced by songwriters Jerry Leiber and Mike Stoller, "Procol's Ninth" featured a slightly different direction from the previous release with a much more stark sound compared to Chris Thomas' more elaborate productions. According to an interview with guitarist Mick Grabham conducted by Roland Clare for the 2009 reissue Leiber and Stoller focused less on the production sound and more on "the structure of the songs". The band appeared on the cover of the album in a straight forward unassuming photograph mirroring the sound of the album itself. The cover featured simulations of each band member's signature.
"Procol's Ninth" was the first release from the band to feature nonoriginal songs: a remake of The Beatles' "Eight Days a Week" and Leiber & Stoller's own "I Keep Forgetting". "Eight Days a Week" was put on the album by the producers initially against the band's wishes. The album also featured a track that had been composed by Brooker and Reid early in the band's career--"Pandora's Box". The version included on the album differed substantially from the more psychedelic unfinished track of the song that was ultimately released as a bonus track on the band's first album in 2009.
In 2009 Salvo reissued the Procol Harum discography remastered by Nick Robbins with bonus tracks selected by Gary Brooker and Keith Reid. For "Procol's Ninth" included three bonus tracks that featured little to no overdubs for each track.