The thing so far seems to be everyone thinks that the "If You Die, We All Move Up In Rank" trope holds true here, but the Rolling Stones are getting discussed too little. The Rolling Stones were the other giant group of this era, so a situation where the Beatles broke up in 1966 really requires discussion on what this does for and concerning the Rolling Stones. I just don't know enough about the Stones to say much.
If The Beatles break up in '66 and
Sgt. Pepper is never made, I can tell you this, and this will make a HUGE difference for The Stones moving forward: The Stones wouldn't follow
Between The Buttons with that pile of garbage known as
Their Satanic Majesty's Request.
This is a big deal because, without feeling like they've got to 'Follow The Beatles', they probably move into what I like to call their 'Golden Age', only they do so in mid to late '67, rather than winter/spring '68.
TSMR, with the exception of 2 songs (
She's a Rainbow and
2000 Light Years from Home) is just plain terrible.
No
Sgt. Pepper, The Stones move on to some of their finest work:
Beggar's Banquet.
I tend to like the idea of
Beggar's Banquet opening with
Jumping Jack Flash and ending with
Sympathy For The Devil, with all the good stuff from
Beggar's in-between. (Especially the terribly under-rated deep cut
Jigsaw Puzzle...love that song.)
Only thing is, if The Stones DON'T go through the learning experience of
TSMR...do they ever evolve into the band that made
Beggar's Banquet?
I like to think they do, I'm almost sure they would, but
TSMR was one of those lessons of "Hey! You can't just put any shit you write on an album and expect it to sell just because 'You're The Stones'!".
Perhaps they come to their
Beggar's/
Let it Bleed/
Sticky Fingers/
Exile on Main Street period just out of wondering 'What now?' when The Beatles break up. The talent's still there. The chemistry's still there. It just needs the proper spark to set it off.
They'll still release
Between The Buttons in spring of '67, as that was the follow up to
Aftermath and their answer to
Revolver, but I don't know if The Stones in summer/fall '67 can make
Beggar's Banquet yet.
Any possible POD's that could accelerate The Stones evolution to the point where they can transition straight from
Between The Buttons to
Beggar's Banquet?
The Stones sound like a totally different band on
Beggar's than they were a year earlier on
BTB.
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Now, as to The Beach Boys, also mentioned in this thread, I think without the pressure to match/surpass The Beatles, Brian Wilson doesn't lose it altogether and fry himself while working on
Smile!.
In fact, with the pressure to match/surpass The Beatles gone, I think Brian Wilson doesn't push himself so hard during the creative and production process of
Smile!, and takes a more relaxed approach to crafting the album, and with far less personal anxiety, thus, he actually ends up making the album he
wanted to make, rather than the confused, rambling, 'Where the HELL is this thing going?!' mess that
Smile! ended up being IOTL.
Just my two cents.