This is not a fair question. I couldn't even begin to limit to just one band never mind one album. I'll have to give it some thought between:
Tool
Led Zep
Black Sabbath
...MetallicA "Master of Puppets" Then followed to a second Ozzy Osbourne "The Ultimate Sin" 3rd, AC/DC, "Highway to Hell".....
BUT the "metal" goes on and on AS LONG as its Speed metal, or Heavy Metal, or Hard Rock, none of that damned "Death metal stuff, I like to understand what they're saying/singing, NOT screaming!