I do happen to think all of my favourite singers have distinctive voices. I read your very first posting and you listed your favourite singers and also mentioned that we should list singers that give you a "shivery feeling". All my favourite singers do. Singers I don't like would leave me with a nauseous feelingquote:Remember folks....it's not your favourite vocalists I'm looking for, it's the most DISTINCTIVE. Who can you tell INSTANTLY when you hear a snippet of radio...

But, sorry if I misunderstood your original questions...
