"child in time" by Deep Purple. My whole life this song would randomly get stuck in my head. I remember trying to figure this out at the bar when I was 30 with a bunch of people there and we figured it might be Rainbow. So I went home and listened through every Rainbow song, including the crap after Dio left and nothing. It drove me crazy, I even thought I made it up in my head lol. I cant remember how, but I eventually figured it out a few weeks later.

My dad loved Deep Purple so thats probably where the seed planted. lol

https://m.youtube.com/watch?v=FpA707p7w9A&ra=m

At least you picked a great song too obsess over.

The Stranger Things final season teaser would have solved it for you.