Rock Age

During the inaugural year of 1971, Warner Bros.-Pioneer Corporation released their very first albums, and among these was a group of titles that were promoted as part of the "Rock Age" campaign.
Die-cut Obi with Rock Age logo was attached on the albums issued in May.1971 - Aug.1971. As an exception, some second pressings have the Die-cut Obi, Led Zeppelin - I, II, III, Rolling Stones - Sticky Fingers, Emerson Lake and Palmer -1st ...

Another similar campaign from 1971 was the "Sound Rock Age 7" series started Sep.1971 after "Rock Age" campaign. The "7" means following 7 artists. Crosby Stills Nash & Young, Led Zeppelin, The Rolling Stones, James Taylor, Deep Purple, King Crimson, Emerson Lake and Palmer.

Promotional issues of some can be found with Rock Age obi & blue promotional labels.
Blue promotional labels were used for more than just the Rock Age series, so don't conflate one with the other absent photographic confirmation.

At least 40 different releases have been positively identified.

At least 12 other releases are suspected to have been part of the original campaign:
P-8009R Arlo Guthrie Washington County
P-8010R Fleetwood Mac Kiln House
P-8014A Yes Time And A Word
P-8015A Allman Brothers Idlewild
P-8016A Cold Blood Sisyphus
P-8021A Van Morrison Street Choir
P-8023A Blues Image Red White & Blues
P-8029W Curved Air Air Conditioning
P-8034A McDonald & Giles McDonald & Giles
P-8037A Phil Woods And His European Rhythm Machine
P-8041A Led Zeppelin IV
P-8078A Delaney And Bonnie And Friends Never Ending Story Of Love