Slow-fi is a weird thing that bored and lonely people have created lately where they take a song and they slow it down - like, a lot. Usually also using a frequency filter to flatten the sound a bit too. The resulting music is supposed to be "relaxing" and appealing, though I personally have never found it to be so.
But anyway, Microsoft just released another contextless video, calling it a "slow-fi remix" of the Windows 95, XP, and 7 startup sounds.
I mean you can listen if you want; but I think the more important thing about the video is, it says "Microsoft Event 2021" at the bottom, referring to the Windows event coming later this month....and it is exactly 11 minutes long.