Pink Floyd -- The Wall
That album encompasses everything an album should be: Original Sound, thought provoking lyrics, identification, Amazing seamless presentation, and most importantly, pulls at EVERY single one of your emotions. Happy, Sad, Temptation, Pure Joy, Depression, Rebellion, and PRIDE.
While other Pink Floyd albums hold a special place in my heart, Dark Side of the Moon, The Final Cut, and Wish You Were Here; The Wall seems to have something extra. They all have this Opera or Ballet like presentation quality to them, but The Wall is like everything Pink Floyd was ever trying to say or do in one album. And what's more is that it's TIMELESS. I wasn't even ALIVE when The Wall came out. I didn't discover Pink Floyd until around 1999, and each message speaks just as true today as it did then. Truely a masterpiece.
Other great artists have produced similar production albums since, (Radiohead, Smashing Pumpkins, Tool, NiN, and it pains me to admit, but I can actually classify Green Day's latest into this Epic Opus production category) but I feel they all owe something to The Wall.