Trackmania gameplay. It's an arcade racing game, purely skill based, no story to follow. Players will play the same track multiple times until they get a good time, that way you don't miss anything important if you look away for a while. Probably not gonna work for you if you're not into the game though.
trackmania has that in common with basically all speedrunning streams/content. super nice to have in the background since it can be repetitive and you can pay attention if they get a good run going :)
and there are people who speedrun probably every game you've ever enjoyed, so there is plenty of options!
Anything from the Simon Whistlerverse, today I found out, brain blaze, casual criminalist, they're all good to have playing in the background, especially when Simon starts ranting.
I currently have a Baldur's Gate 3 stream running in the background and she's just doing inventory management. My brain can't handle anything more complicated.
I'm currently going to through the BBC classics ultimate story collection. I also liked the BBC radio 4 rendition of Dorian grey. The radio ones tend to have multiple voices and some special effects. I also loved the blade trilogy by Joe Abercrombie.
If you like sci-fi, I can recommend the children of time and deepness in the sky. Vernor vinge also has a novella in audio format called fast times at Ridgemont high.
Do you like silly stuff? I usually put on the YouTube channel Drawfee. A group of artists take ridiculous prompts and draw them on the fly, and the idea usually mutates mid-drawing based on their conversations.
Might not be great as you have to be able to look up from what you're doing to see the drawings. I'm more of a multitasker so it works for me.
Lately I've been going through my favorite artists and listening to their music in chronological order.
I hate the "pick something to listen to" phase of music listening, full albums let's me control what im listening to while not needing me to maintain it.