What is the world record for number of people singing the same song at the same time?

[Czarcasm]

@leahcim

I’ll grant that 4’33" is traditionally not played, rather than not sung. But if people can “sing” Imperial March for Star Wars as “Bum, bum, bum, bum-ba-dum, bum-ba-dum” even though it is an instrumental, then they can sing 4’33" as “…”.

In what key-Silent “E”?