Mted As near as I can see, you are right on the money! I really prefer to perform Do-wop with 5 voices, Lots of the old groups had 4part gtoup with lead vocal. This allows lots of liberties with the lead. When I mentioned the 1st or EgC inversion, I am sorta intending this forthe 3 inner voices, allowing the Bass some liberty to walk around. The lead may or may not be one of the three "inner parts, but it sure is easier to get a full sound with 5. I son't actually analyse the theory of each situation, but it seems that this technique keeps the upper three voices very tight, which to me contributes to the "Do-wop sound"