Singing catcher

[Bandit]

As long as the catcher does not use names, direct player #'s, or direct references to the pareticular batter during the swing I have no problem with them singing or repeating rymes. Is it bothering the batter or the umpire more when you start worring about what the catcher is saying or doing?

I have to ask...if the fans sit outside the fence and start singing do you have them stop too?

Is their any direct rule reference that can an umpire can fall back on that prohibits singing by any defensive player?