Fwappy B-day TM!
We had a lovely old Maine Coon boy for many years, who had perfect pitch, as did husband. If anyone was singing and went off key, he would FWAP! them upside the head to make them stop.
One year on his birthday we and some friends got a tad toasted and gathered around the top shelf of the cat tree to sing the birthday song to him. husband was the only one who didn't get clobbered.
Luckily the old geezer kept his claws in, LoL