Mbachur. I wouldn’t want to incur your wrath seeing that you killed a mountain lion with your bare hands 🙂
Nevertheless, I think the MB/Bach take issue with “just singing” if just for enjoyment (see what they say about those singing while going about their work).
I suppose it also depends on your definition of “shiros visishbachos”. If you are “just singing” and waving your hands wildly in the air, is that the shiros visishbachos the Bach/MB had in mind?