This has been a banner day for songs stuck in my head. First it was Ricky Martin. Then the theme song from “Charles in Charge,” followed by the Macarena. Finally, the Spice Girls. If there’s an area of research that I want funded in this country, it’s to find the part of the brain responsible for having a song stuck in it, and develop a procedure which disables it without harming the rest of the brain. Now that’s something we should spend our tax dollars on. Seriously, I wonder how much productivity is lost by people distracting others by singing or humming these horribly catchy songs.