I have a few ideas. I might go with anything from Prince (Purple Rain) Led Zepplin (Stairway to heave).

Millie is Bon Jovis daughter in law, so “Prayer” could fit too.

But they said they got the song with Kate Bushs help… maybe Peter Gabriel? Or Pink Floyd?

Or Eddie is coming back to save them with Iron Maiden - Troopers or Run to the Hills lol.

Or just a time jump to 1999 and playing Prince - 1999

Any guesses til the final episode?