There were some good things after 1966--Rod Stewart, Linda Ronstadt, --(what can I say, I love her voice--and some of her material), Joni Mitchell, Eagles.

And 1968 did have Those Were the Days--I sang that forever--and it sounded like it had been around forever.

But I'll stack the quality of 1966 up against 1968--or any other year in the rock era after 1966. Even Simon and Garfunkel were better before 1967--and I believe the album Parsley Sage Rosemary and Thyme came out in 1966.