How did you and your S/O pick out "your song"?

I’m curious as to how people usually decide what “their song” will be.

How did you and your S/O choose? What is “your song” that represents your love for each other? What is so special about that song?

Me and my lover call Don’t Change by Musiq our song, because the lyrics say how we feel towards eachother…

“I’ll love you when your hair turns gray, and I’ll still want you if you gain a little weight, the way I feel for you will always be the same just as long as your love don’t change. I was meant for you and you were meant for me, and I’ll make sure that I’ll be everything you need. Girl the way we are is how it’s gonna be just as long as your love don’t change”.