Beck performs at another charity gig in LA, this one for Better Together.
The other names on the bill include Dave Grohl, Santigold, and Greg Kurstin. It seems like they're all using the same house band: Grohl, Justin Meldal-Johnsen, Jason Falkner, Kurstin, and Susannah Melvoin. Singing back-up include Wendy & Lisa, and Maya Rudolph (so expect some Prince jams, I guess?).
The rehearsal clip that Susannah Melvoin posted was all of them figuring out "The New Pollution."
Some other clips I've seen that include Beck on stage were a heavy "E-Pro" (with Grohl absolutely smashing the drums), "The New Pollution," a few other Beck stand-bys (see below), the old funky favorite "Erotic City" (with Santigold duetting with Beck), a "Purple Rain" (sung by Maya Rudolph with Beck on backup), "Raspberry Beret" (sung by Melvoin with Beck on backup), "1999," and apparently a snippet of "Hot For Teacher" for some reason.
[people and bands
Bass: Justin Meldal-Johnsen
Drums: Dave Grohl
Guitar: Beck Hansen, Jason Falkner, Susannah Melvoin
keyboards: Greg Kurstin
Other Band: Dave Grohl, Greg Kurstin, Santigold, Wendy Melvoin
Vocals: Maya Rudolph, Santigold