None of those are in my top 5 dirty meg but they are great albums, though I have not heard Al Stewart - Past present and future.
just my opinion that any list of greatist albums should have any album newer than 5 years old banned, Albums should have to stand the test of time and fashion before being named a classic IMO.
Barcley James Harvest....live tapes
Joni mitchell .... Blue
Beatles.... White
Guns and roses ... appatite for destruction
Genisis .... seconds out
*note these are all true vynal albums not cd's or greatist hits collections and is subject to change at any moment as the mood strikes*