It’s annoying to me (F32) that my fiancé (M38) listens to his ex’s music

My partner and I have been together for 3 years and he listens to his ex's music occasionally (I see that her music has been recently played on Spotify) lol. They were together for less than a year like 4 years ago and I find it annoying that he checks up on her /listens to her music. How would you feel and what would you do in my situation? I am not trying to control him I just don't know if bringing it up would do anything. I know I can't expect him to do what I would do because for me I couldn't care less about my exes lol if they had music I wouldn't listen to it because I don't care.