Whats the problem with learners who bring there music up on stage with them and stumble through a song? with the help and encouragement from appluse they will get better and more confident. Trust me I have been there. And still there in other respects
A friendly amosphere helps. If someone sings your song so what?

There,s a diferrence between a Folk Club and The Dead Dog Saloon at the OK Carral?
Kind Regards Pete