Great clue, ginge, and thanks, geevo. Thanks for the mentions, skyewalker and ginge.
rosalind: I suppose I liked the Beatles when I was a kid.
Perhaps my most common earworm is "O Mensch, bewein dein Sünde groß"; I often find myself whistling it (with all the ornaments of the chorale prelude), even while shopping, which gets me some strange looks. Then, of course, there's "Zoot Suit Riot"... :)