Ok, time for another music what-if.. this time what if the Beach Boys don't complete & release Pet Sounds?
Perhaps the POD is that Brian Wilson has a bigger breakdown in 1964 & quits music then, or a different POD where he buckles under the pressure & shelves Pet Sounds part-way through the sessions (ala 'Smile').. but somehow, someway it never appears in stores.
Given that it was a huge landmark album in "progressive pop" & lush psychedelia, and a big influence on Sgt Pepper, how would pop and rock unfold over the next few years without that album?