The Led Zeppelin reissue campaign continues in 2015, turning the spotlight on the double album Physical Graffiti. The deluxe edition of the group’s sixth studio album will arrive 40 years to the day after the original debuted on February 24, 1975. As with the previous deluxe editions, Physical Graffiti has been newly remastered by guitarist and producer Jimmy Page and is accompanied by a disc of companion audio comprising previously unreleased music related to the original release.

Certified 16x platinum in the U.S., the commercial success of Physical Graffiti was equaled by its critical reception. Generally regarded as one of the greatest double albums of all time, the original 15 tracks represent a creative tour de force that explores the band’s dynamic musical range, from the driving rock of “Custard Pie” and an acoustic arrangement of “Bron-Yr-Aur” to the Eastern raga of “Kashmir” and funky groove of “Trampled Under Foot.”

The companion audio disc that accompanies the deluxe edition of Physical Graffiti has seven unreleased tracks, including rough mixes of “In My Time Of Dying” and “Houses Of The Holy,” as well as an early mix of “Trampled Under Foot” called “Brandy & Coke.” All the unreleased companion tracks offer fans a chance to hear well-known songs from a different perspective, including the Sunset Sound mix of “Boogie With Stu” and “Driving Through Kashmir,” a rough orchestra mix of the band’s eight minute opus “Kashmir.” Also featured is “Everybody Makes It Through,” a strikingly different early version of “In The Light” with alternate lyrics.

Physical Graffiti is available for pre-order at ledzeppelin.com