Nope, didn't learn about this from Three Billboards, but rather from my Grandad's copy of Voulez-Vous that he gave to me probably not long after it came out. Maybe he didn't care for it, maybe he expected it to line up more with the less disco-y Arrival. What I do know for sure is that I was, even at 10 or 11, pretty floored that he even bought himself an ABBA album.
Strength and solidarity. Or a message you can send to/hear from yourself.