With the release of the deluxe editions of Led Zeppelin, Led Zeppelin II, and Led Zeppelin III, the band has launched an extensive reissue program of all nine of its studio albums in chronological order, each remastered by Jimmy Page.
They include dozens of unheard studio and live recordings, with each album featuring a second disc of companion audio comprised entirely of unreleased music related to that album.
Led Zeppelin III's companion audio contains six studio outtakes as well as three previously unheard compositions: 'Jennings Farm Blues,' 'Bathroom Sound,' and their take on the blues classics 'Keys To The Highway/Trouble In Mind.'