As a follow-up to our story of August 19th, we now bring you a new interview with Roger Waters about his involvement with the West Bank Wall, and the documentary itself - Walled Horizons - which is presented in two parts below.

In an interesting interview undertaken on Friday (August 28th), on the BBC's World Service radio station, Roger talks about why he writes the songs he does ("gloomy songs" included), explaining what motivates him. He talks about his involvement with the movement against the current wall, and how it related to the original concept for the 1979 album.

You can listen to the interview via the BBC.co.uk/WorldService website.