I didn't plan on this being an inaudible whisper, but something went wrong with the microphone settings, and you really can't hear me...voila, it became an inaudble whisper video instead. Sorry about that.
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