Back in the 60s the average person like myself had no clue about the Wrecking Crew or Funk Brothers.
Which is exactly how the record companies want it. The whole “star maker machinery behind the popular song” was built on maintaining the illusion. The unfortunate side-effect was that the real musicians behind the groups we saw went unappreciated for too long. Fortunately the documentaries have given them their long-overdue credit, sadly not all were still around to know it.