I don't know why the stereo setting on my microphone sounded like it was working when I was recording and then the video itself does not have it. I'm sorry. No 3d sound, even though it should have. This was a request I received a few weeks ago. Hope it's relaxing. There's some clicking noises too which I do not know where they came from.
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