The nine tracks featured on "Led Zeppelin III"'s companion audio continue to offer a window into the band's recording process, with seven studio outtakes of songs from the album as well as three previously unheard compositions: "Jennings Farm Blues" (an instrumental forerunner of "Bron-Yr-Aur Stomp"), "Bathroom Sound" (an instrumental version of "Out On The Tiles"), and their take on the blues classics "Keys To The Highway/Trouble In Mind."

Due June 2 (June 3 in North America), the band are also releasing reissues of "Led Zeppelin I" and "Led Zeppelin II" the same day. Deluxe editions of the group's first three albums are the first projects announced as part of an extensive reissue program that will see all nine of the band's studio albums reissued in chronological order, each remastered by Jimmy Page.