Perhaps not the technically correct use of the word, but hopefully it caught your attention!
I was having a conversation with Steve, and we were talking about Adele's latest album '21'. We both agreed that it was one of those comparatively rare albums that is both hugely popular and very good. So question 1 for blog comments and/or responses on the facebook feed is what other albums fit that description. I'll put Sergeant Pepper's Lonely Hearts Club Band up for 1967's candidate.
Then we got talking about the albums that seemed to be in everyone's record collections whenever you went round to their house/student room. Bridge Over Troubled Water and The Beach Boys 20 Golden Greats seemed to be nearly everywhere at Uni (even though it was the 80s!) Dark Side of the Moon, Making Movies and later Thriller feature on the list.
Any other suggestions?