Could Lady Diana Sing?

Princess Diana really did sing 'All I Ask of You' for her seventh wedding anniversary gift to Charles, as reported here in 1988 by the Washington Post. The Post article adds that Lloyd Webber himself was there to witness the performance, which was filmed in private on the musical's West End set.

Did Diana really sing Phantom of the Opera?

Princess Diana really did film herself performing “All I Ask of You” from Phantom of the Opera, and shot the video on the musical's West End set. ... “That it's exactly as it happened in the series—as in she hired the West End set, got a film crew in, and filmed it for Charles.

What religion is Lady Diana?

Although she was raised in the official Anglican church, in keeping with her position as the daughter of an earl, Diana appeared to dislike its formality.