What I mean that there is no such thing as a folk voice is. If you free the sound up - use proper diaphragm support - open the throat and find the proper range to sing in you have a good singing instrument. I have done this for three voices this year who have added notes got higher in pitch and sound better. This is vocal technique not vocal style which refers to how you sing and is a separate subject. I am also referring to the somewhat doctrinaire teachings of people who do not know about vocal production and saddle unfortunates with a style which may suit the owner but not the pupil BECAUSE NO ACCOUNT HAS BEEN TAKEN OF HE PUPILS NEEDS AND CAPABILITIES