The one apparent “drawback,” if one can call it that, to this doc is the “authorized” nature of this doc of a band not without its share of “lore” and controversy.

Morgan Neville (“Piece by Piece,” “20 Feet from Stardom,” etc.) didn’t make this Led Zep film. So don’t expect notoriety of a “Cocksucker’s Blues” variety from it.

Early reviews have been mixed, which suggests that maybe that missing candor from a truly “independent” filmmaker perspective hurts the finished product.

Considering the subject, though, the sound (IMAX release) and images are sure to have that chunky bottom we’ve come to expect from the heaviest of the heavy.

Feb. 7.