Led Zeppelin's Led Zeppelin IVMP3 CD, 24 January 2017

In this wickedly entertaining and thoroughly informed homage to one of rock music's towering pinnacles, Erik Davis investigates the magic - black or otherwise - that surrounds this album.

Carefully peeling the layers from each song, Davis reveals their dark and often mystical roots - and leaves the listener to decide whether this release is some form of occult induction or just an inspired, brilliantly played rock album.