Why do you like a song? What makes it a favorite?

I have been thinking of the "mechanics" of why we like a specific song more than others, what makes us like it?
Recently I discovered a lot of music on my music server I was unaware of, it was not showing up because it was not in a folder and/or labeled correctly. So after a lot of time and work my music count went from 415 to 614 and I listened to a lot of music I had forgotten about since it was not showing up.

So this led to me rebuilding my Play lists, 14 of them. Then I got the idea to make one last one, Will's Best Of.
This brought up a fundamental question, how do I determine what makes my Best Of list? I started with a guideline to help me determine if a song made the Best Of cut;
I listen to a song and it's; Good, I like it. - It doesn't get added
I listen to a song and it's; "Oh yeah... that's the stuff" I could immediately play it again - It gets added to the Best Of

What is it about that song that compels me to want to add it to my Best Of, what or how does it influence me to add it? Is it the lyrics? music/instruments? Vocals?
I have heard many things over the years. How studies have shown that the harmonics of music interact with your brain effecting brain chemistry and alter your mood.
Or
Music invokes an emotional response often causing you to recall specific memories of people, places, times.

I can see all of these things being the cause. When I hear one of my favorites I get that immediate feeling, I immediately know it is a favorite.
Sometimes the music influences me more, sometimes the artist's voice does, sometimes it's everything.
Some times I can hear 5 seconds of a new song and know I am going to really like it.
I have a eclectic taste in music so it is not a certain genre that I gravitate to.
Some of my favorite Rock bands are; AC/DC, Van Halen, and then there are several Taylor Swift songs that I like. Hey I admit it, well maybe not if I was out with the guys at a bar having a few beers. But what can I say, there is just something about those songs that I like, that pulls me in. Can't explain it.
Does all this mean it is harmonics?

Music invokes a emotional response in me. There are many songs that take me to a specific person, place, time.
On the downside there are a few songs, ones that I like that I will never listen to again, ever.
I have an entire Play list of songs that are heavy, I don't listen to them often because of the emotions they invoke.
Does this mean it is an emotional response?
Or a combination of emotional response and harmonics?

Is the Corona induced boredom causing me to psychoanalyze how my brain determines if a song is a favorite? Could be.

How about all of you? Why do you like a song? How do you determine if it is a favorite?

Is it a favorite because it is good, or because it takes you to another place, time, or reminds you of someone?

Will