Interestingly, I can’t recall ever having an ear worm. I’d guess it’s related to my struggles with learning texts verbatim: I have very hard time learning to recite poetry, songs, etc.
I am asking because I was struggling with memory techniques like memory palaces. Turned later out I'm a visual aphantast, but I can imagine songs, chords, sounds.
Maybe it's just the way you function, and you just need to use other strategies?
I don’t have bad memory, it’s specifically the task of reproducing the exact choice and order of words that trips me up.
No issues with memorization, however. Brains are weird.