Ones that you've had for years and you never get bored of.
We've all got albums that we know we like but we maybe will probably never physically put in the cd player again (Is This It springs to mind).
Which are the albums that you always HAVE to listen to whenever you remember they exist?
Me: 69 Love Songs
Richard D James Album
Brighten The Corners
In the Aeroplane Over the Sea
Remain In Light
Anything by Autechre but mainly LP5
Lifted or the story is in the etc etc
Heaven or Las Vegas
and there are more...