A year later, I can separate my albums a bit more.
Classic Rock:
1. The Dark Side of the Moon, Pink Floyd (number two overall)
2. The Wall, Pink Floyd (number three overall)
3. Disintegration, The Cure (number four overall)
4. Led Zeppelin IV, Led Zeppelin
5. Sergeant Pepper’s Lonely Hearts Club Band, The Beatles
6. Houses of the Holy, Led Zeppelin
7. The Rise and Fall of Ziggy Stardust and the Spiders from Mars, David Bowie
8. Breakfast in America, Supertramp
9. Magical Mystery Tour, The Beatles
10. A Night at the Opera, Queen
11. Hysteria, Def Leppard
12. Rumours, Fleetwood Mac
13. Don’t Look Back, Boston
Indie Rock(-ish)
1. The Suburbs, Arcade Fire (number one overall)
2. In the Mountain In the Cloud, Portugal The Man
3. Good News for People Who Like Bad News, Modest Mouse
4. Channel Orange, Frank Ocean (hence the "-ish"; I think it fits here better than with Hip-Hop/Rap)
5. Funeral, Arcade Fire
6. Origin of Symmetry, Muse
7. The Bends, Radiohead
8. Manners, Passion Pit
9. AM, Arctic Monkeys
10. High Violet, The National
Hip-Hop/Rap
1. My Beautiful Dark Twisted Fantasy, Kanye West (number five overall)
2. All Eyez on Me, 2Pac
3. Life After Death, The Notorious B.I.G.
4. The Eminem Show, Eminem
5. Section 80, Kendrick Lamar
6. Charity Starts at Home, Phonte
7. Overly Dedicated, Kendrick Lamar
8. Aquemini, Outkast
9. Reasonable Doubt, Jay-Z
10. Me Against the World, 2Pac
11. ATLiens, Outkast
12. Undun, The Roots
13. Below the Heavens, Blu & Exile
14. good kid m.a.a.d. city, Kendrick Lamar
15. Illmatic, Nas (top five rap album, but I look more for pure sound than lyricism, hence the rather uncommon Outkast, Lamar, and Eminem album rankings)