The Song:"The Jungle Line" is a song by Joni Mitchell of her 1975 album,
The Hissing of Summer Lawns.
Beck covered it at the MusiCares Tribute to Joni Mitchell concert in 2022. A lot of other artists sang at the show, including Brandi Carlile, Cyndi Lauper, John Legend, St. Vincent, and even Joni Mitchell herself. Most news reports mentioned that Beck picked an odd choice of songs (it's not one of her more famous ones), but it seems well-received.
Beck is a big Mitchell fan. He did a cover of "California" for reasons unknown, but has only shared a snippet of it on an Instagram reel once. Also in 2021 at a show, during a little medley of covers, he sang a line or two from "All I Want."