(It was Nigel Hook, whose set for "The Play That Goes Wrong" is a masterpiece).
The actors who come across best here are those whose set pieces more or less stand alone.
(Mr. Scherr, whose set preceded Ms. Dobson's, provided a literal example: his brother, Peter, was on bass).
There are a series of jokes about a Hurt Locker musical, a flop whose set lurks in the background.
Pharrell Williams is a slight, anonymous figure whose set is both undeniably funky and oddly prim and proper.
A Tribe Called Quest, whose set drew on its 1993 album, "Midnight Marauders," now underlines its jazzy, intricate raps with floppy-limbed choreography.
Nas, whose set split the Saturday night audience with Guns N' Roses, presented himself not as a bad guy but as a chronicler and preserver of hip-hop.
There was bluegrass virtuosity from the mandolist Sam Bush and from Punch Brothers, whose set included a string-band version of a Radiohead song.
Animal Collective, whose set was cut short by equipment failure — the band said it got no sound check — spun its songs into dizzying, overlapping, euphoric incantations.
Nearby, the team behind Justice, whose set earlier in the night had been cut short 15 minutes by the police because of the noise, chatted with Mr. Smith.
"She wanted to make sure I wasn't dead," said Osborne, whose set jaw and stoic manner can famously make him look somnambulant.
