It' a tricky subject. On the very rare occasions when i do sing in a sing-a-round (un-accompanied) i do try not to sound as though i'm o i'm trying to immitate a Carthy or McColl or Peter Bellamy (if that's possible). However, if you have listened to say McColl's 'Freeborn Man of Travelling People' so many times over 40 years i wonder if that voice does kind of creep in (albeit unintentionally) at bit at times. I'm not a treined or pro singer so i'm always a bit self concious (even more so when reading threads like this). I try not to let my voice sound bland so do try and vary the passages a bit in what you might call the 'traditonal' style whilst keeping to my own voice as much as possible and hopefully making the words audible to all. To me when singing songs like e.g. Thorneymore Woods, you're telling a story of a poacher's day so the emphasis is to get that across as interestingly and clearly as possible. The sound of your voice is secondary as bad or at times copy-cat as it may sound.