Next Ashley James Slideshow: Celebrities attend Comedy Central's FriendsFest - launch party - London United Kingdom - Tuesday 15th September 2015
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.