Among arrivals at Comedy Central's 'Night Of Too Many Stars: America Comes Together For Autism Programs' event were popstar Carly Rae Jepsen, Rage Against the Machine guitarist Tom Morello, talk show host Jon Stewart and comedian Seth Rogen with his wife Lauren.
The live album is set for released in November.
The movie begins filming in the UK.
The 'Sherlock' and 'Doctor Strange' star joined Gilmour onstage at the Royal Albert Hall for a rendition of the Pink Floyd classic.
Time to learn what Kathy Bates' character has to do with all of this.