I know exactly what you mean about hearing the music. Its really annoying but at the same time kinda funny.
All it is, is thoughts, nothing else. I would just be sitting in my chair, trying to meditate - to clear my mind of all
thoughts - when suddenly a song I know starts playing in my head. I just try to push it away and ignore it and
it seems to go away without too much effort.

I'd say just try to ignore it like other thoughts as you do to concentrate. Dont even give a second consideration
as your giving more attention to it and becoming more distracted. It works for me.

Good luck