Maybe some linguist can explain why Why "the powers that be"? and my question are basically the same (grammar and such), but I would not be able to recognize this to be the same thing, so I would still have to ask. So no - Why "the powers that be"? - does not answer my question.
In the song "Tribute" https://www.youtube.com/watch?v=_lK4cX5xGiQ the demon asks Tenacious D "Be you angels?" Shouldn't that be "Are you angels?" and this was artistic freedom of Tenacious D or is this a posh way to ask the question - befitting a demon? The question sound similar to "How be your?" from "How be you" or "How are you"?, but is not the same, that is why I am posting.