I think maybe the album / DVD to which you're referring here is called "Shadows & Light...." ??@Clix Pix : There's a DVD of this concert, in LA, where she's backed by the best Jazz musicians of the time; Metheny, Jaco, Michael Brecker, so many others, and I have the disc but right now I can't remember the title (it's past my bedtime). Hopefully someone else can identify the video concert.
This wasn't a "smattering" of jazz; she played mostly her own tunes, and her backup band just blew it out of the water, and she held her own beautifully.
I've been a huge fan of Joni my entire adult life, and greuled thru the Grammies a couple nights ago just to see her perform. She's in her 80's now, and because of polio and an aneurism, has needed to teach herself to walk, talk, play, and sing THREE times now, more than I could do. What a wonderful artist.
Further research suggests that indeed it is!

Shadows and Light (Joni Mitchell album) - Wikipedia
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