I would suggest that GUEST,ok go right on singing (?) the way he, she, or it recommends. Soon, he, she, or it will loose his, her, or it's voice entirely and I'm sure that will be a boon and a blessing to those around him, her, or it.

Then, any utterance he, she, or it tries to make will sound like an asthmatic cat trying to cough up a hair-ball.

Don Firth