Rare unedited Led Zeppelin mixes recorded for their 1975 Physical Graffiti album are going to be auctioned off next month. These studio recordings and others are from a collection owned by Ron Nevison, famed producer & engineer. Some of the recordings include an unreleased version of "Kashmir" called "Driving to Kashmir," along with mixes of "Trampled Underfoot," "Custard Pie,"Ten Years Gone" and more. They were recorded in February of 1974 at the mobile studio of Faces bassist Ronni Lane at Headley Grange in East Hampshire, England. Other recordings include rough mixes from Bad Company, The Who, Ozzy, Eric Clapton and others. They're all up for bid as part of RR Auction's Marvels of Modern Music sale, March 13th-20th.

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