Unreleased studio mixes from the recording sessions for Led Zeppelin’s 1975 double-album, “Physical Graffiti”, are going up for sale next month, and RR Auction have provided an audio preview for interested buyers.

The auction house will sell the tapes – from the collection of audio engineer Ron Nevison in a  Mobile Studio that Nevison designed in an Airstream trailer – as part of its Marvels Of Modern Music auction, which runs March 13 – 20.

Led Zeppelin recorded the “Physical Graffiti” tracks.

Structurally, many tracks are not very far along – most of the guitars and vocals were redone later, and some lack the vocals entirely. Additional orchestration was also added, and many times only the drum tracks from the recordings were used in the final product.

Nevison recorded Bonham’s drums on a separate track, running the cymbals through a phaser as an experiment; the band liked the results and used it on the final song. In addition to the drums, the fully-instrumental “Driving To Kashmir” recording also features the instantly recognizable guitar riff.

“Nevison's Physical Graffiti tapes provide a window into the creative process behind one the greatest albums ever produced. An absolutely remarkable piece of modern music history.” 
says RR Auction VP Bobby Livingston.