Pre-pandemic, Judd Apatow hosted a semi-regular night at Largo in Los Angeles, where he'd have a different roster of comedians and musicians. Beck has appeared at a number of them, but usually he was announced beforehand as one of the guests.
This one, the first post-pandemic Judd show, was different, in that the line-up (including Beck) was kept unannounced. Largo posted some photos and a clip of Beck singing "Loser" after the show, though.
[people and bands
Drum Machine: Beck Hansen
Guitar: Beck Hansen
Host: Judd Apatow
Other Guest: Blake Mills, Guz Khan, Margaret Cho, Zach Galifianakis
Vocals: Beck Hansen