When I was eight, our family had an old windows 98 computer, and I played Half-life Opposing Force because no one was supervising me, and I swear that game opened my third eye. Never been the same since. Never been the same since....
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