Guitarist and singer-songwriter David Gilmour refused to perform a final encore and sat at the soundboard, leaving the band, with backup guitarist Snowy White, to improvise a slow, sad 12-bar blues, which Waters announced to the audience as "some music to go home to". That night, Waters spoke with producer Bob Ezrin and Ezrin's psychiatrist friend about the alienation and despair he was experiencing, and he articulated his desire to isolate himself by constructing a wall across the stage between the performers—himself, along with the rest of the band—and the audience.