In my town we have had this mechanical displays in Ogilvy’s department store window for over 70 years, since 1947. Bavarian scenes by German toy manufacturer "The Mill scene"
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