Originally Posted by
MaryCalifornia
Here is my super non-technical analysis of how high they can sing, from someone who has no musical education: they are all tenors. Randy can sing the highest. Timothy is next. Don can sing in falsetto, but I would not consider this his normal "range". Timothy's highest notes are actually in his range - not falsetto. I'm not sure if Randy's highest notes would be considered falsetto. Joe is next, then Bernie and Glenn and Felder are all sort of the same. Experts, feel free to correct me!
As far as how many octaves they can cover - no idea. I would guess in their prime, Randy and Tim could go very high and somewhat low. They all seem to sing in a pretty narrow range...
I would certainly enjoy hearing some expert, technical analysis of their voices, though! In HOTE Glenn says regarding Joe potentially replacing Bernie, "Might lose something in the vocals..." but I think Joe has a really interesting voice that is very strong. But, who knows, maybe an opera instructor would think it sucks.