I can't help but add my two cents for books I would have liked to have seen included. I've focused on adding books from authors that appear to have been snubbed vs. listing a preferred book from an author who was mentioned. Here's a short list of books I would suggest adding.
Classics: Anything from Shakespeare, Murders in the Rue Morgue, The Great Gatsby, Ivanhoe, Count of Monte
Modern Classics: Night, In Cold Blood, Cujo, The Godfather, Pillars of the Earth, The Bourne Identity
Gay: Tales of the City, The Men from the Boys, Giovanni's Room, Call Me By Your Name
I'm curious, what books you would have suggested adding to this list?