“With Led Zeppelin, there was no break-in period, no ‘early phase’ where they figured out what kind of band they wanted to be,” (Pitchfork). “They were fully formed from the first repetition of the ‘Good Times Bad Times’ riff, and they powered along through their first half-dozen albums crushing everything in their path. Zep never had their Sgt. Pepper’s, their Exile, their Who’s Next, because every album was more or less that good — for a while, anyway.
This was a band that knew the music it wanted to make and executed it with ruthless precision … Physical Graffiti … found the band inhabiting what Neil Tennant once described (and Tom Ewing fleshed out) as their ‘imperial phase’ … everything they tried during these years somehow worked. Physical Graffiti … (is) Led Zeppelin’s White Album, the one they made when they were at their creative peak and had a million ideas, but were also under a tremendous amount of strain and saw the end starting to come into focus.”
After barreling along in G minor through the first verse, the Physical Graffiti track “The Wanton Song” (1975) next features a multi-key interlude (0:58 – 1:23) before returning to G minor. The surprisingly contrasting interlude is back at 2:03, but this time we land in an F major instrumental section at 2:28. At 3:03, we’re back on the express train of the G minor verse — with a quintessential Zeppelin guitar riff at its heart.