"Happy Birthday
Happy Birthday
People dying everywhere
People crying everywhere
But Happy Birthday
Happy Birthday."

it's to "The Volga Boatmen"
Happy BIRTHday...ugnnn
Happy BIRTHday...ugnnn

"When you reach the age you are,
Your demise cannot be far.
Happy BIRTHday...ugnnn
Happy BIRTHday...ugnnn"

and so on in that ilk..

one about "flames from candles on your cake"