I can think of at least fifty, but I'm trying to limit myself to the ones that I've played over and over again for decades and decades. There is a lot of good stuff that has a high burn out level, but some other things, well they just stick with you, they follow you in and out the years. They always have something to say to you. It's always OK to put them on.
I feel that way about AC/DC, and the Beach Boys too. Its never a bad time to roll down the windows, drive down the coast highway and listen to the Beach Boys or Dick Dale. It just always fits. Its always OK to crank AC/DC or Zep.
I agree with Sketches of Spain, it is a masterpiece.
Also on my list - in a bit of an odder vein, is Dusty Springfield's Dusty in Memphis which I've been listening to without it ever getting old since it came out in 1970 or so. Every song on it is as good as the hit 'Son of a Preacherman' - sort of sank when it came out, but its survived well.
Also, I'd love to toss in another, perhaps the only record I owned in high school that I still listen to at least once a month, other than Led Zep and Pink Floyd, the first Tower of Power disc, East Bay Grease. Its a funk as funk was being born, and it sure was a pretty baby.