CLICK HERE for 5 BRAIN-ITCH SONGS YOU'LL NEVER FORGET). I said, I wrote an article about the malady a long time ago; it's called an EARWORM." (CLICK HERE to see BLOG article here)
He responded, "Well, earworm does sound like a communicable disease!"
Definition of EARWORM: "a catchy song or tune that runs continually through a person's mind." I would add: "an irritating tune or song."