There was a really nice piece by Lindsay Zoladz in the NY Times on Joni's appearance at Newport, celebrating the bravery of an aging woman who recently suffered an aneurism and had to re-learn how to walk re-interpreting her music with a voice a couple of octaves below the voice that made her famous.

Oh, that last line that Joni sang out in the video- "Oh you're a mean old daddy but you're outa sight"....  so wonderful to see that, it made me cry. 

I agree, Dusty, Brandi did an amazing job of singing Carey. She sounded just like Joni!

Thanks, @dusty-turtle.  I saw the clips you saw, it seems.  Pretty cool.

I don't think so, Robin.  I remember "A Case of You" and "Both Sides Now" and some instrumental Joni played on an electric guitar.  I don't think there was a dulcimer in any of that.

@dusty-turtle Was there more mountain dulcimer visible in the video you saw (versus the one I posted below)? 

I saw another video of this set a day or two ago.  Brandi Carlisle does an amazing job singing Joni's songs.  I hope Joni understands the profound love so many of us have for her music.

You'll hear mountain dulcimer long before you'll see it and, no, Joni Mitchell isn't playing it (though she was the big surprise guest at Newport).  

One of the Hanseroth twins (Brandi Carlisle group) opens Carey with mountain dulcimer and you see a quick look at him on dulcimer later in the video.