On earworms

Well I of course missed it, because I don’t listen to the external radio (except Sounds Of The Subcontinent). But apparently they had some sort of earworm discussion on NPR this weekend. My friend at the market mentioned it to me because she knew of my propensity for music constantly coming out of my face. But she made it sound as if they were saying that having this fully orchestrated radio playing in your head almost constantly was unusual. I am weirded out, I thought everyone had this. Do you have it?