Well Adamcomic - at least in the context of being a Beatles history buff it’s rather interesting. Regarding the Let it Be sessions, in reality George Martin wasn’t involved at all.
Glyn Johns was though. He was George Martin’s right hand man at EMI Studios and he was the guy who oversaw all of the recording equipment being sent from Abbey Road to the Ealing Film Studios. Anyway, one thing’s for sure… apart from the odd visit just to say hello, George Martin wasn’t present at all. The entire studio recordings were done under the tutelage of Glyn Johns. The rooftop recordings were live, but the version of Get Back which was released as a single was a true studio take. And that tune was mixed and sealed off by Glyn Johns and only Glyn Johns.
But here’s the rub - during that 5 - 6 week period, The Beatles did absolutely shitloads upon shitloads of jamming and cover versions just to get their tightness together. The tapes were running the entire time. Maybe not the film, but the recording desk and reels were. And amongst that were heaps of variations of early workouts of Get Back. Including a a version which was much more acidic in it’s lyrical content. It kinda sounded a bit like Proud Mary in style and temp too.
Originally the song was quite political. It was very bitter about the inherent racism amongst the English middle class who didn’t like all the Pakistani immigration. Those people used to say to the Pakis “Why don’t you get back to where you belong?” and THAT is what The Beatles were originally singing about.
But you see, a huge truckload of those sessions were stolen not long after filming but before the Phil Spector period. And those sessions are what have been leaking out all these years as lost bootlegs and stuff.
Nonetheless, there NEVER, categorically was NEVER a George Martin mix of Get Back. The single was mixed by Glyn Johns and he’s very proud of it. The live rooftop versions were engineered and mixed by Glyn Johns, and the other studio takes were mixed and tinkered with by Phil Spector.
Apparently The Beatles persevered with Let it Be (the song) for over a month before they got the take that mattered. And even then, two months later George went back and did a nastier but less tasteful lead break than the original. Other than that, the song stayed the same and Phil Spector didn’t touch it. The album version has the mellow lead break, and the 45 had the gnarly lead break.
It was all a bit of a muddle really as to who worked on what. But George Martin is quite adamant - he’s not responsible in any shape or manner. And indeed he was quite surprised when the boys approached him in May '69 to record Abbey Road. He was sure he was never going to hear from them again.