From YouTube.
Biographies of Naturally 7 ()内は声域
Roderick Eldridge--1st Tenor
Garfield Buckley(C2 to F)--2nd Tenor
Warren Thomas(B1 to G4)--Drums
Polo Cummings(Bb1 to F4)--4th Tenor
Roger Thomas(C2 to C4)--1st Baritine
Dwight Stewart--2nd Baritone
Armand Hutton, Hops,(F0 to not so high)--Bass
Read Vocal By Polo
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