All it took was the slightest hint of a backlash against ‘Led Zeppelin III’ to instigate a resounding musical response from Led Zeppelin, and they didn’t even have to name their historic fourth LP to get their point across.

After all, ‘Led Zeppelin IV’ (a.k.a. ‘Four Symbols,’ ‘ZOSO,’ ‘Untitled,’ etc.) may well be the definitive hard rock album of all time, never mind Zeppelin’s, with timeless, universal songs like the circuitous ‘Black Dog,’ the exuberant ‘Rock & Roll’ and the multi-faceted piece de resistance, ‘Stairway to Heaven,’ obviously speaking for themselves.

But the classics just kept on coming…taking shape as Tolkien-inspired fantasy one minute (‘The Battle of Evermore,’ ‘Misty Mountain Hop’), wistful folky laments (‘Going to California’) and percussive orgies the next (‘Four Sticks’), before culminating in another reinvented blues standard, ‘When the Levee Breaks,’ boasting the heaviest drum sound ever conjured.

So what else is there to say about this career-crowning achievement that has not already been said before, in triplicate? Exactly…