Conversation so far:
Where did the idea for the film Pink Floyd - The Wall come from?
Even before the original Pink Floyd album was recorded, a film was intended to be made from it.
What was the film Pink Floyd - The Wall going to be about?
The concept of the film was intended to be live footage from the album's tour, with Scarfe's animation and extra scenes
Are there any other interesting aspects about this article, besides where the idea came from and what the film was going to be about?
The film was going to star Roger Waters himself

Question: What was his role going to be?
Self-contained rewrite: What was Roger Waters' role going to be in the film Pink Floyd - The Wall?