Bassist Roger Waters conceived "The Wall" during Pink Floyd's 1977 In The Flesh tour, modelling the character of Pink after himself and former bandmate Syd Barrett. Recording spanned from December 1978 to November 1979. Producer Bob Ezrin helped to refine the concept and bridge tensions during recording, as the band were struggling with personal and financial issues at the time. "The Wall" is the last album to feature Pink Floyd as a quartet; keyboardist Richard Wright was fired by Waters during production, but stayed on as a salaried musician. Three singles were issued from the album: "Another Brick in the Wall, Part 2" (the band's only UK and US number-one single), "Run Like Hell", and "Comfortably Numb". From 1980 to 1981, Pink Floyd performed the full album on a tour that featured elaborate theatrical effects. In 1982, "The Wall" was adapted into a feature film, for which Waters wrote the screenplay.