I researched this awhile back they call it Default Mode Network (DMN) which it’s our brains idle mode. Some people’s DMN includes “musical thoughts”. I write mu

I researched this awhile back they call it Default Mode Network (DMN) which it’s our brains idle mode. Some people’s DMN includes “musical thoughts”. I write music all the time and I think it might be more intense for some due to genetics (my grandparents were old time radio performers and all their kids musicians) or nurtured more by engaging with music (e.g instrument, singer, avid listener). It’s normal for many (humming). I surveyed my 30 classmates in high school class once and on the spot most said they had a song they were “thinking” about. I usually am just cutting up and repeating bits of things. Not much different than daydreaming and “visual thoughts”.