I have seen many youtubers doing videos for this, and I saw the forum thread here for perfect bands. However I think that no band is perfect, as each album is always different from eachother. That said, I do think there are perfect albums, and we should talk about them in this thread to share with each other. These are albums that just surpass the rest, that are perfect in every note. They will keep you interested from start to finish. Here are mine

Agalloch - The Mantle
Wintersun - Wintersun
Summoning - Oath Bound (I know most people prefer the older stuff, but this one is definitely my favorite)


Also I apologize if there is another thread with the same purpose, I tried doing a search but could not find one.