Beck made a surprise special guest appearance at Judd Apatow's benefit concert at the Largo in Los Angeles. (He also appeared at one of Judd's shows in 2015, though that was not unannounced.) Also on tonight's bill were comedians Pete Holmes and Tig Notaro. It was a benefit for Let America Vote.
According to Judd's instagram clip, Beck asked him for requests and he said "Lost Cause."
Roger Joseph Manning Jr. accompanied Beck on piano, but it was just the two of them together.