To improve the ambience, please pretend all the background noise is the undead. Just a buncha restless ghouls, putting away their ghoul dishes, chatting with other ghouls, and unlocking their ghoul cars.
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