COMPUTER-GENERATED VOICE: (As Pink Floyd, singing) All in all, it was just a brick in the wall. LEVITIN: Now, these are early days, but they captured enough of it that the song is recognizable by ...

It's been 30 years since the big-screen version of Pink Floyd's classic album The Wall hit cinemas - and now previously unseen photos from behind the scenes of the production have been put on show ...