this is a tough one. If we're talking about the records in my collection that have been played the most (ie since I first started playing them in the 70's), here's the top 3:
o Mike Oldfield - Ommadawn
o Genesis - Lamb Lies Down
o Boz Scaggs (his first, self titled)
These 3 probably don't have much of a lead over another 20 or so in my collection, and they aren't seeing the most play these days, but I still bring them out regularly, after 30 years.