Wow. Thanks for the link of Jr.Walker and the All Stars from Feb. 13, 1965. Listened with pleasure.
When I was going to Wayne State University back then I used to pass the Hitsville USA studios often. A friend of mine got a job doing some of the background harmony singing (mostly “ooooaaahh” or “oh, baby” lyrics but he worked with the top Motown stars behind the scenes.
Great days.