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.