It isn't just a list thing, although those Mojo or Rolling Stone lists seem to be part of the idea.
Anyway, it is really all about albums that are capital letter "I" important, the ones that have an influence that not only lasts but that we can hear lasting in our own collections.
I have a few in my mind here, ones I think that a lot of people probably own.
Here is one though that I (along with nearly everyone else, let it be said) really believe is a massive milestone. Without this, you wouldn't have most of punk, no art rock, no Goth and no JAMC (to be specific).

On its release, the album was a massive failure; hardly anyone bought it and the critical reception, where there was one, was mainly negative.
The album lost money too. It had an expensive cover (the banana peeled off and the cover was made by a special process) and sales were poor. It didn't get much airplay because of the subject matter of most of the tracks and the music itself wasn't exactly radio-friendly in the Summer of Love.
It is one of those albums that has become a classic in hindsight.
Sunday Morning
Waiting For The Man
Femme Fatale
Venus In Furs
Run Run Run
All Tomorrow's Parties
Heroin
There She Goes Again
I'll Be Your Mirror
Death Song
European Son
So, that is one of my seminal albums. How about some noms from other 'Spillers?