In one of the class events the headmaster asks Faye about the Czar's mysticism advisor (something like that) and gives her a musical hint using Boney M's Rasputin lyrics (the first two lines and "Ra ra").
Ah! Right. I didn't connect it with Boney M, but I guess it's possible to give it this connotation.
He also tells Faye to go and listen to some Boney M. I love that song.
Okay, it's official now, you were right, Larrdath.