Previously unreleased and unmixed tapes from Led Zeppelin’s 1975 album Physical Graffiti are going up for auction at the Amherst, N.H. auction house RR Auctions. The tapes, which feature various instruments and vocals, were used in the mixing of the album. 

The tapes are part of acclaimed producer Ron Nevinson’s collection. Other items on the block from Nevinson’s collection include early mixes of Bad Company’s debut album, songs from Eric Clapton’s 1973 album Eric Clapton’s Rainbow Concert and tracks from the Who and Ozzy Osbourne.

Physical Graffiti was recorded at Ronnie Lane’s Mobile Studio, which Nevinson converted from an Airstream trailer. 

Also up for auction will be a signed first-edition pressing of the Beatles’ Twist and Shout, a pair of John Lennon’s glasses and the cape Elvis wore during the 1973 TV special Aloha from Hawaii.

The auction will be held from March 13 to March 20. 

Two samples from the auction, including the opening rift of “Kashmir” can be heard here: