I very, very often get music playing in my head. Currently running is "Getting to Know You." I believe it was in the movie "The King And I", with Yul Brynner, and Debra Kerr. Good movie, and Yul's signature role. I've seen him in a variety of different types of roles, and he was good in all of them. I've even seen him as the male lead in a comedy movie, can't remember the name off hand, but he was good in that, too.
The least little spoken or written phrase, or anything else triggers tunes in my head. I started looking through the forums a few minutes ago, and there was a post about getting to know people here at the site, so naturally my brain's memory bank started to play that old movie tune. I am fortunate in that having tunes playing in my brain usually doesn't bother me. If a particular tune does bother me, I am eventually able to change what's playing.
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau