Any Sacred Harp singer, wear your ear-plugs. Tim Eriksen is a good example.

Time was when loud was good. Amplification has completely changed that. Some traditional singers should be very far from a microphone. I suspect some sound techs don't know how to deal with them.

I heard Libana doing Eastern European music in concert once with mics. They just did not sound right to me. To get the right kind of overtones, etc. it must be naturally loud.