I remember hearing that the Beatles were not originally interested in “Yellow Submarine” – they were disillusioned with cartoon projects due to the less-than-ideal quality of those crappy Beatles cartoons produced at the height of Beatlemania.
When they saw the quality of the nearly-finished version of “YS”, they wanted to take part, but it was too late to redo the voices.
Not sure about the other two questions.
FU Shakespeare
My Sweet Lord was released on All Things Must Pass, which was re-released as a Millenial Edition with extensive sleeve notes (where GH gives credit to Eric Clapton (and others) for the first time – apparently when it was originally recorded it was not the done practice to credit artists signed to other labels, though friends would often guest without credit on each others work). Anyway I do not recall seeing JL’s name in these notes, I’ll check again next time they’re to-hand.
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John sang backup on Elton John’s cover of ‘Lucy in the Sky’. (He was returning the favor for Elton singing backup on ‘Whatever Gets You Through The Night’.
John also sang backup on Bowies ‘Fame’.
If you really want to hear the difference in John’s voice vis-a-vis tape speeds, compare the Let It Be version of ‘Across The Universe’ (mixed by Phil Specter) to the original, unreleased until the Beatles’ Rarities. (Currently available on Past Masters.)
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There’s an amazing version of the fast version of “SFF” going around (mostly on bootlegs)- the version that they chopped in half and slowed down to make the second half of the finished single. It starts with a horn and strings intro and John’s voice sounds frantically young and energetic. Once you’ve heard it, the actual released single will always sound wrong after that- “Slow John” stretching out “no one i think is in my tree” sounds like a 45 rpm record played at 33.
One of the major disappointments of the Anthology for me was that a clean version of this was left off.