The Morality of Music is defined as The recognized fact that music and song, apart from the words used, have the ability to arouse either noble or base feelings and emotions in the persons who hear a melody. The reason for this emotional influence seems to lie deeper than the familiar association of ideas with certain music or song. It involves something inherent in all musical rhythm to evoke a human response that is either morally elevating or degrading, depending partly on the listener but also on what is heard.
Music is not entirely a matter of taste. Right reason can tell one whether a given piece arouses noble or base feelings.
I don't disagree with it. I just don't get Satanism from little Sr. Cristina's performance. It strikes me more as ardent love. Enthusiasm. Legitimate desire. Nothing lewd, rude or crude with that (though the tattooed guy looked smitten --- but in a good way, I think.)
Recall that allegedly offensive music --- and dancing! --- caused Saul's daughter Michal, to reject her husband David: thus she did not become foremother of the Messiah. David was not always in the right about everything, of course. Far from it. But there's no indication he was at fault in this instance.
Remember, too, that to cheer up her nuns, St. Teresa of Avila --- Doctor of the Church --- handed out tambourines, and danced with castanets.