Here’s how it went down, as best I can remember.
Wife: You know, there aren’t any songs about all the dud guys you go out with before you meet the right one.
Me: (ceasing strenuous workout, putting down French play): Really, dear?
Wife: And that’s true of heaps of women. You waste time on losers, because they’re a bit unusual, and then the right guy is someone completely normal. Someone you would have ignored when you were younger.
Me (really thinking about cold fusion): Ah, yes.
Wife: It would make a good song.
Hence,
major to minor 