How do you sort your LPs?

For my collection of about 3,000, I do what others have noted, sorted by genre, then alphabetical, and the genres within rock are arranged in a loosely narrative way.For example:
1 - before the Beatles 2 - surf and hot rod
3 - garage and mid-60’s verse-chorus-verse stuff
4 - late 60’s hippie stuff
5 - country rock
6 - Southern rock
7 - mid to late 70’s American pop/rock
8 - British Invasion
9 - British rock after the British Invasion
10 - American singers and songwriters
11 - 80’s rock
12 - soundtracks
13 - blues and guitarists
14 - 70’s hard rock
15 - heavy metal
16 - power pop and 70’s verse-chorus-verse stuff
17 - female singers
18 - R&B
19 - protopunk & 70’s punk
20 - 80’s punk
21 - 80’s garage rock revival, cowpunk, Paisley Underground-related, and other non-punk underground rock
22 - countryish singers and songwriters
23 - jazz
24 - pre-70’s country
25 - female country singers
26 - 70’s and 80’s country
27 - instrumental country
28 - bluegrass
29 - folk
30 - comedy
31 - classical
32 - miscellaneous
I do this to make sure I can find what I’m looking for and so that some records don’t get forgotten. For example, when I was filing a Beau Brummels record away, I did a little browsing and saw The Buckingham’s first album, Kind of a Drag, a great little garage rock record before the band got lame and added horns; I hadn’t looked at or thought of that record in a year or two. There are many great records, like that one, that might otherwise get lost if I did everything alphabetically.
Other times, I might say to myself, "I’d like to listen to some Chicago blues," and I can go browse the blues and guitarists section, and it is all there in one place; I don’t have to go to several different places.
There are all kinds of "does this go here or there?" questions, and I enjoy pondering those. For now, for example, Led Zeppelin goes in hard rock instead of British Rock after the British Invasion with Elton John and Dire Straits. Anyway, that’s what works for me.

Here's one I haven't heard yet:  due to the size of my record cabinets (IKEA makes some great ones, I have different configurations ranging from one cube to 2 x 3 cubes that can put placed either way), I separate rock by American artists/groups versus British artists/groups, then in alphabetical order.  I have so many Beatles (group and solo) records and Beach Boys (also group and solo) records, that they merit their own separate cabinets.  

LP's?  What are those?   <g>  Actually, when I first moved to AZ and needed money, I left my stereo but brought all my albums. I sold them at a swap meet in Tucson for $1200 lump sum. Boy was that a mistake. I'd always open the album, throw the paper liner away and replace it with a plastic lined liner, and the opening was always 90 degrees to the cardboad liner, and NEVER EVER touch the grooves. 

I have over 3500 LPs at this point. I occasionally find duplicates and forgotten music. A less random arrangement would likely be better. It is fun to rediscover music though. 

I really can't imagine any practice other than basic alphabetical filing. Yes, I have a separate section for classical, and also for greatest hits collections that include multiple artists. (I collect radio station greatest hits collections. Please don't ask why.)

My LP collection is large enough that it has to be spread over two floors. So for convenience, it is filed A through Z on each floor. And in my listening room, I have a small "hot box" in the rack to file new purchases as well as current favorites, so that they don't have to be constantly refiled.

Of course, whatever works for you is what's best!