I'm willing to bet that half the people reading this, though they may be brilliant as all io9 readers are, still have to hum "The Alphabet Song" when they're alphabetizing. Why do we remember songs so well when other memories fade? It's partly because musicians do a lot of the thinking for us.
Last week, in a moment that I can only hope was not caught by the studio cameras, I entertained Bonnie Burton, who was filming the io9 DIY Sci-Fi show by singing and pantomiming the theme song to Reading Rainbow. I've never watched that show. I heard people singing a few snatches of the song over the years, and now know it more perfectly than I do a lot of stuff I tried to drill into my head. Plenty of people reading this will remember state capitals and the nations of the world via old Animaniacs songs. Why is music powerful enough that we can remember it without trying?