What do you call a song that's stuck in your head?

Who came up with the term, 'Earworm?' What makes certain songs, Earworms? How do you get rid of an Earworm?  Have you started your FREE TRIAL of Who Smarted?+ for AD FREE listening, an EXTRA episode every week & bonus content? Sign up right in the Apple app, or directly at WhoSmarted.com and find out why more than 1,000 families are LOVING their subscription! Get official Who Smarted? Merch: tee-shirts, mugs, hoodies and more, at Who Smarted?