This video features an old(ish) Compaq keyboard, lots of typing, and no talking. For those who may wonder, I was typing sections of an old article about Murphy, North Carolina that I found in a newspaper. (I originally had this listed in the description as a Dell keyboard because I have a Dell keyboard that I was going to use, and then I changed my mind at the last minute. I guess I just had Dell on the brain when I typed the description originally.)
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app