Don't sweat it. Diana Ross is one of my old favorites, too. I'll listen to anything from Eminem to obscure anime bgm's.
But let's get back to the matter at hand. We could pacify the royal guards by having them establish eye contact with Britannica, thus allowing him to use his Information Overload attack. However, getting small groups of guards to look him in the eye is easier said than done. With that, I'll open the floor to suggestions.