[Led Zeppelin IV]

Issued in a tri-fold cover. The printed inner sleeve of the original release is added here as an insert. On sticker: Deluxe 2-LP set on 180g vinyl LP 1: Original Album LP 2: Unreleased Studio Outtakes On transparent foil sticker: This reissue ℗ & © 2014 Atlantic Recording Corporation Printed in the EU On center label disc 1: ℗ & © 1971 Atlantic Recording Corporation. Manufactured in Germany. On center label disc 2: ℗ & © 2014 Atlantic Recording Corporation. Manufactured in Germany. On insert: Sandy Denny appears by courtesy of Island Records The material on the companion disc presents a portal to the time of the recording of Led Zeppelin. It is a selection of work in progress with rough mixes, backing tracks, alternate versions and new material recorded at the time Runouts are entirely etched and where Optimal Media GmbH's "faintly inscribed "geometric" marks" appear, these are mirrored: Variant 2: Side A '-=1', Side B '△+1', Side C '==1', Side D 'T=1' Variant 3: Side A '1=-', Side B '▽+V', Side C '⟘+V', Side D '11△' Variant 4: Side A '++', Side B 'V/\/\', Side C 'II/\', Side D 'V++' Due to the nature of the hand etching, it can sometimes appear that there is a space between the letters and numbers of the Optimal Media GmbH identifiers. However, as per the Optimal Media GmbH label page, their runout scheme "is in fact always without spaces."