As requested by several people, we're back in Dollar Tree, checking out the candle section. I tried to speak more softly here. The audio is a bit out of sync. Sorry about that. I don't think it'll kill anybody, though, so anybody eager to comment about it can simmer right back down.
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