It's surprisingly simple. I have a green screen curtain in my studio room, and a few umbrella lights, since I've found that multiple sources of diffused light is key to hiding the ripples in the green screen curtain. Filming is on a Zoon Q2n-4K, which has a really wide field of vision, so it's usable in a small space like this. I recorded a midi drum track to keep time, and then just played & sang each part in turn in front of the camera. Occasionally, you can see the earpiece in my ear. I'd take the previous recording and play it back on my phone through an earbud, so I was always playing the same part at the same time on each instrument. While filming, I'm also recording the instrument and vocal to tracks on Cakewalk, so I can mix the whole track easily, as well as having the audio from the camera to make it easy to sync the videos with the sound. Whipped up a quick background using AI (I know, I'm going straight to hell for that one), and overlaid all the elements in Wondershare Filmora, where I removed the audio from the video tracks and inserted the mixed recording in their place. Easy Peasy, but there is a fair amount of time involved, which is why I don't do it every week. Overall, this video took about 10-12 hours, I think, not counting time spent planning the video.

I feel like I may have learned that technique from someone, somewhere...

Crow this is your cousin? Man your whole family is very talented. Mouse got my sub!