OMG what a difficult question. Especially for a dinosaur like me! I can think of 10 albums that have really marked me, but I will put them in more or less chronological order rather than order of preference I think. OK - here goes:
The White Album - The Beatles
Tubular Bells - Mike Oldfield
In the Court of the Crimson King - King Crimson
Tarkus - Emerson Lake and Palmer
A Trick of the Tail - Genesis
The Song Remains the Same - Led Zeppelin
Animals - Pink Floyd
Regatta de Blanc - The Police
Gone to Earth - David Sylvian
and you see... I am running out of space already. So I will miss out most of the 80s and go straight to
STITI - UW
I told you this was difficult