I see that Mickey MacConnell (our own chordstrangler) recorded (and probably wrote) a song called THE LITTLE DRUMMER BOY. He calls it "a twist to the story." It's on his album "Joined Up Writing." There are no lyrics or sound sample there, so I can't say for sure whether it's the one you want, but I doubt it. Anyway, it's different from the "pa-rum-pa-pum-pum" one, and it would be nice to have it documented at Mudcat.