/vr/ - Retro Games

Maybe someone here can help, I need a real expert. I play Christmas Nights once a year and a couple years ago I did something I've never been able to replicate. How do you get one of the Nightopians to sing? My memory is bad, but I could have sworn it was singing Holy Night, at least the "sleep in heavenly peace" part. I can't even find footage of anything like this.