I see, I must have been intereacting with characters that had music at the start then, thank you for the response !The music is used sporadically, mostly tied to characters or events. You might be interacting a lot with someone who doesn't have much music associated with them. Also, most of your regular exploration on the map won't have any music. It's not a bug.
I'm loving the game so far, it's been a while since a game like this didn't get me bored to the point of skipping dialogue !
The writing seems pretty good so far, the characters make me interested in learning more about them, I'll be sure to review positively after I've put more time in the game but so far this is great.
Well done !