Conversation so far:
What was the concept of the film Pink Floyd - The Wall?
The Wall is a rock opera that explores abandonment and isolation, symbolized by a wall.
Who was the film Pink Floyd - The Walls  comprised of?
The film creates an approximate storyline of events in the life of the protagonist, Pink, a character based on Syd Barrett as well as Roger Waters
Are there any other interesting aspects about this article, besides the concept of the film and who it was comprised of?
Pink's father also dies in a war, which is where Pink starts to build a metaphorical wall around himself

Question: what was the biggest accomplishment?
Self-contained rewrite: What was Pink Floyd's biggest accomplishment?