Stevie kneeling with tambourine during The Chain live...

Sorry, this is a rather obscure question but one I've wanted to know for years...

We all know that the Tusk documentary shows Stevie kneeling down and hitting the tambourine on the stage during the bass solo. The Largo 79 video, I believe, has a shot where I believe you can see Stevie in the background start to drop to this position right after the chorus ends...

There's also the Japan 77 footage that shows Mama La doing the same thing just when the band starts in after the bass solo...

So, for any "old-timers" out there...was this standard for Stevie back then? Did she always do it? When did it end? The film of the St Louis 79 show is a classic clip...

You know, I just thought of something else...Stevie used to end Rhiannon in this crouched position back until 1982 (clearly evident in all of the old videos/films). Kinda strange but ethereal....When did that start? It's pretty safe to assume it hasn't happened since 82.

David, need your help!