What a fascinating thread this has become and is! Thanks to you all. As one who simply sang without ever knowing anything about that which you speak of here, it is all a revelation. I literally "followed" my guitar or banjo with my voice. I would play the chord or the individual note a short fraction of a second before I sang it. Either that, or I 'knew' from a chord what relative note I desired to get---so I just WENT AND GOT IT! (Hope that makes some sense.) My ten-note range got me a long way in the 40 years I sang folk songs. (Twelve notes on a good day.) Without my instruments to follow, I was lost.

Thanks to you all again.

Art Thieme