Conversation so far:
what was the concept?
only about success, not even attempting to get acquainted with the actual persons of whom the band was comprised .
who was it comprised ?
Pink Floyd.
Are there any other interesting aspects about this article?
In the mid-1970s, as Pink Floyd gained mainstream fame, Waters began feeling increasingly alienated from their audiences.
what happened after this/?
When a band or a person becomes an idol, it can have to do with the success that that person manifests, not the quality of work he produces.
what was the biggest show?
CANNOTANSWER.

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