Day 19: The Clash - London Calling
It may seem like heresy, but I've never really 'gotten' The Clash. That said, a relistening did really help me appreciate them, with plenty of songs I hadn't noticed before ('Clampdown', 'Revolution Rock') sticking out. And, of course, there's the absolute masterpieces on here - fuck the title track, I'm all about 'Lost in the Supermarket'.
(although that may be childhood nostalgia from a cover in the movie Over the Hedge)