This was an episode of a TV show made in the 1990s. It was in color and in English. The episode in question involves this guy coming to a town where people get agitated whenever anything “musical”, such as whistling, tapping a glass with a fork, etc. I only remember two scenes vividly. The first depicted a young girl blowing her head off with a shotgun in a cemetery. The other scene was of the main character and the townsfolk singing “Amazing Grace”, causing a spectral monster to appear and kill everybody.