Amazingly enough I haven't had any tunes in my head that threaten to overtake me today. Though every time I pop into this thread I begin to sing the last song someone posted adn it gets stuck for awhile.
I didn't have any song ringing in my ears until I read the title of this thread. Now it's Can't Get You Out of My Head by Kylie Minogue, a song designed to stay in your head for days on end. Thanks a LOT Goldenberry!