Natalie Merchant's voice is not necessarily "ugly", but I could see how a lot of people would not like her. It's interesting to compare her early albums to her later work. Her unique style of enunciation is now exaggerated to the point that she is very difficult to understand... but I like her nonetheless.
As far as "ugly" goes, a good example is bluegrass icon Ralph Stanley, who is the embodiment of the the popular bluegrass axiom which holds that "bluegrass is best sung from the heart and through the nose!"
As far as "ugly" goes, a good example is bluegrass icon Ralph Stanley, who is the embodiment of the the popular bluegrass axiom which holds that "bluegrass is best sung from the heart and through the nose!"