I once had to do, on the organ in a very large “contemporary cathedral” in a city which shall be nameless, Barry Manilow’s “Could it be Magic” as the processional. OK it was the 70s and I was not quite 20 at the time.
Later when I was 25, in a small town (again nameless) I played, on a BELLOWS organ, no less, the recession of Christopher Cross’ “Sailing” and accompanied the soloist who sang “For All We Know”. . .
After those two “highlights” I have insisted, as a professional, that the music be suited to the venue. I will play pop tunes up to 15 minutes before the wedding, I will play pop tunes at the recession. . .but for the ceremony, no more Carly Simon, James Taylor, Andrew Lloyd Webber, etc. Luckily either my clients are developing better taste or else the word’s gotten around that they’d best not mess with me!