How do you handle chants?

[heyblue]

If you were to tell a coach to stop the chants directed at the other team, what rule in book would you use to stop it?
I mentioned in an earlier post that I have been told that you could possibly use the USC rule or possibly interference.
I do like the chants urging their teamates to do good. I think it's an awesome part of the game. But, I want to put a stop to chanting against the other team, I just want something to refer to in the book to back me up.

Thanks for all of the posts.