Hardest ever.
I'll do it by genre.
Punk - X-Ray Spex "Germ-Free Adolescents"

Folk, Punk - Andrew Jackson Jihad "Can't Maintain"

Folk - Iron and Wine "Our Endless Numbered Days"

Hip hop - Wu-Tang Clan "Enter the Wu-Tang (36 Chambers)"

Electronic - The Knife "Deep Cuts"

Classic - Pink Floyd "Wish You Were Here"

If I had to choose one album out of these I absolutely couldn't do without, it would be Can't Maintain or Deep Cuts.