You've been singing the theme to The Love Boat for hours now, and you're becoming unmoored. If a song is on an unfinished loop, "sing it through all the way, or listen to the entire song, to achieve completion," says James Kellaris, Ph.D., a professor of marketing at the University of Cincinnati, who studies why catchy tunes — called "earworms" — stick in your head. "If you can't remember all the words or how it ends, rewrite the ending. Sometimes appending a Beethoven coda or even just 'Shave and a haircut, two bits' will do the trick." If you can’t banish it, replace it. That works for Ron Dante, one of the lead voices behind the insanely catchy Coke jingle "I'd Like to Teach the World to Sing." "I substitute a Beatles song, like 'Help!' or 'Let It Be' — both of which say something about what we need at that moment," he says. If the eraser tune gets lodged in your brain, too, he adds, "listen either to complex music, like Mozart, or unfamiliar music that lacks a hook, like New Age."