Hey Raj,
I organize by genre. I place associated artists together (e.g., Rotary Connection is placed behind the Minnie Riperton LPs, same with Junie Morrision and the Ohio Players). I have the following scheme to organizing my records:
1. Jazz is organized by instrument. The sections are broken down as follows: Sax/other woodwinds, trumpet/trombone, piano traditional, piano progressive, organ, guitar, bass/strings, vibes, drums/percussion, jazz groups, jazz vocalists.
2. Soul and R&B are broken down as well:
-Male vocalists ('My favorites' like Ray Charles, Marvin Gaye, Al Green, etc.).
-Male vocalists ('Traditional soul' such as David Porter, Wilson Pickett, etc.).
-Male vocalists ('R&B' like Leroy Hutson, DJ Rogers, Clifford Coulter, etc.).
-Female vocalists/groups ('Traditional soul' such as Aretha Franklin, Betty Everett, Fontella Bass, Honey Cone, The Patterson Singers).
-Female vocalists/groups ('R&B' such as Evelyn 'Champagne' King, Deniece Williams, The Emotions).
-Male groups ('My Favorites' such as Parliament/Funkadelic, The Ohio Players, War, etc.)
-Male groups ('Traditional soul' like The Temptations, The Four Tops, The Originals, etc.).
-Male groups ('R&B' such as Pleasure, One Way, Zapp, etc.).
3. Disco LPs/12"s.
4. Dance/boogie LPs/12"s (e.g., Twilight 22, Derrick, etc.).
5. Ethnic music (Latin, reggae, Italian, Celtic, etc.).
6. Folk.
7. 60's classic rock (e.g., Beatles, Rolling Stones etc.)
8. Heavy metal (e.g., Jimi Hendrix, Deep Purple, Sabbath, Led Zeppelin, Colosseum, etc.).
9. Pop rock (e.g., Hall & Oates, Genesis, etc.)
10. Punk rock/nu wave (e.g., The Clash, Devo, The B-52s, and some pop-ish groups with nu wave elements like Style Council).
11. Progressive rock (e.g., Archie Whitewater, Nektar).
12. Psychedelic Rock (e.g., Little Boy Blues, Colours).
13. Breaks (including OGs and compilation joints).
14. Hip-hop/electro rap.
15. Soundtracks:
-Blaxploitation
-Drama/Thrillers
-Science Fiction/Adventure
-Musicals
-Comedies
-Imports
16. Blues (thanks for the cue, PCMR, forgot this category).
17. Children's records.
18. Classical.
19. Gospel.
20. Compilations.
21. 45's.
I do not have the LPs alphabetized as I am too lazy to do so.
Peace,
Big Stacks from Kakalak