Many of them are the Wrecking Crew, yes, so that's a credit and a huge clue. Mamas and the Papas, First Edition, Beach Boys, Righteous Brothers, Jan & Dean, The Monkees, Nancy Sinatra and The Association are definitely The Crew. You are zeroing in pal. Which session man was on all of these recordings?
Daddy Frank (The Guitar Man)
~ Merle Haggard ~