I don't know if I'm offended or shocked that you'd call music "trivial".
My preferences for music are both intense and very granular. It's annoying to my wife that I'm constantly trying to figure out what she likes about the music she listens to, when she says she just likes what she likes. But even she thinks music is important, even if she avoids analyzing her preferences.
When I say a song is a favorite, I mean I could literally listen to it on loop and probably have. I mean I will never skip it if it comes on during shuffle. Most of those songs have a high level of emotional intensity, especially despair; female or especially mixed male and female vocals; rock or folk instrumentation; and themes of loss but not usually regret.
Not knowing why you like or dislike a piece of music is like not knowing why you like or dislike a food, or a person, or a smell, or a building. How can you go through life knowing so little about yourself?