Sigur Ros is a band that sings in a fictional language, I’m pretty sure. Not totally what you’re asking for but certainly in the spirit

Pineapple is good and not even particularly controversial despite how much the haters seem to want to make it. There was a place I used to live near that did a “cheeseburger” pizza with ground hamburger, onions, pickles, and mustard. I fucking loved it but that thing was CONTROVERSIAL