If you are looking for the musical notation or the name of the song playing in that specific video, it is most commonly identified as:
(from the Everything at the End of Time inspired fan projects). Alone on cammp4
: The track usually consists of a single, echoing piano line that emphasizes the silence of the room. If you are looking for the musical notation
If you are looking for a to accompany a video with this title, here is a short atmospheric monologue: I used to think silence was empty, but
"The red light blinks—the only pulse in a room that stopped breathing hours ago. I used to think silence was empty, but through this lens, it’s heavy. It’s the sound of dust settling on things no one touches anymore. I’m not waiting for someone to walk through the door; I’m just recording the fact that they haven’t."