How do you arrange the order of your records?

My partner and I used to have over 1,000 DVDs and BluRays. She was in charge of filing them… she had them broken down into a dozen categories then alphabetical across six big wall storage units. I could never find a thing. She would say, “It is in Action.? Where is that? She would reply under Fantasy. I would say, where is that? The whole over classified mess was incomprehensible to me. 

I have categories: rock, jazz, classical, blues, and female vocalist (female vocalist itsis vestigial). I need to disperse this into the main categories). Then alphabetic. I usually know what I feel like hearing, then go to find it. So this system works for me.