Nothing.
I can only focus on 1 thing at a time and there's already 20 of them at once at any time in my head.

But I can listen to music. Although it depends on what it is. But not to worry, I can just listen to a single song on loop for hours non-stop.

I like watching magicians do magic tricks while I drive, and trying to spot the technique.

I’m just kidding don’t do that

Might not be up your alley, but there's a dude called "Just Background Noise" who does various Morrowind challenge runs. It's neat stuff, but his name is quite accurate. Makes for some great background listening.

I always have Lofi Girl playing quietly in the background when I'm working.

I like the free Plex channels for Antiques Roadshow and BBC.

Northernlion/The Library of Letourneau, he plays videogames and just kinda does a stream of consciousness thing that often has nothing to do with the game itself. It's entertaining and he has a nice voice.

I like listening to a number of things, but watching things just slows me down.

My son loves the podcast Behind the Bastards. I like animal documentaries.

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.

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.

Star Trek. All of it.

MST3K, especially some of the episodes I'm most familiar with.

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.

Josh Strife Hays. Absolutely whelming 2nd monitor content.

LabPadre's 24/7 stream of SpaceX in Boca Chica. Sometimes watching concrete dry or debris removal is just what I need to take a step back.

Time Team on YouTube, but it’s an archeology show so you really have to like that topic.

Podcasts, currently listening to lets go to court.

i like listening to Lily Simpson videos when i'm doing chores and such. Her videos are often fairly long (meaning i don't need to stop what i am doing to pick another video), easy to take in without having to actually watch with my eyeballs the whole time, and of consistently high quality.

Therapy Gecko, Bad Friends, Podcast But Outside

Audio books are nice. I like short story collections where each story is maybe 20 to 40 minutes long.

STLN DRMS and Seven Beats Music on youtube. Or Soma FM's groove salad stream.

I often have ASMR videos playing in the background while I play chill games or at work. It relaxes my mind and helps me focus

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.

Futurama. there's an entire subreddit for Futurama sleepers and I think it's the largest of its category

My Relias training...

King of the Hill, Top Gear UK, Travel Man with Richard Ayoade

Japanese City Pop.

SomeOrdinaryGamers/Mutahar

If you're okay with a range from mildly interesting to moderately disturbing, I like Nightmare Expo (Nexpo) on youtube