To the Eagle: Filking, at least the way I've always heard it used, means writing new lyrics (often a parody) to a familiar tune. It's a popular practice among science fiction fans as well as in the Society for Creative Anachronism (of which I am a member). And MMario, thank you for the hint. The gist of the song -- or at any rate, the parts he could remember -- seemed "crossover" enough to have found its way to traditional music lovers. So I thought I'd ask here. Any other hints or suggestions would be most welcome.