jamesg1213
I know this sounds horribly nitpicky.....but isn't it 'pa rum pum pum pum', not 'ah ruppa bum bum'? One sounds like a snare drum, the other..not so much...
 

James- Good ear.  I was trying to sing it in a way....so as to not be....plosive city.    I guess I got to close to the bum instead of the pum.  Also, in an effort not to miss Christmas, I went with the first take on the vocals.  Maybe in a revised version for next season, I can get the bums a little more....pum-like.