"Brain radio" is a term invented by Kelly Fineman referring to the soundtrack playing inside your head, even when there is no music playing outside your head.
Some people would think this is a rather cool accessory to one's brain.
Those people would be wrong. They probably don't know what a curse it can be.
The worst time for me is the pre-winter-holiday season, when you can't go anywhere without hearing Christmas carols. All. Day. Long.
People without Brain Radio can have blissful silence inside their heads once they've left the mall or wherever the music was playing.
For me, the music plays on...and on...and on...until I play something else on the radio.
I'm especially susceptible to Brain Radio when I'm reading a musical biography. Usually this is okay, for a while. But then I hear the music when I'm trying to fall asleep, and when I get up, and all day long, unless I play something else to drown it out.
Right now I'm reading a YA SF novel with a title that is taken from a famous rock song.
Although I'm enjoying the book, I have to read something else for a while to get the song out of my head.
I'm sure you can guess the title, too.