Pink Floyd: Behind the Wall (2011)

This documentary looks at the conception, design and live shows of The Wall performed by Pink Floyd in 1980 and 1981. It features in-depth 1980s era interviews with Roger Waters, David Gilmour, Richard Wright and Nick Mason and shows footage of The Wall performed at Earl's Court in 1980. It also features archival footage of the Syd Barrett era Pink Floyd and discusses how David Gilmour was brought into the band to initially augment their live shows when Syd became unreliable due to his drug problem and how Gilmour ultimately replaced him.

Source: TMDb