This is a bit out of my area -- but IMO Adam does not fit any classic rock vocal profile. (Not a big deal or a surprise -- we know he is one-of-a-kind). So I am not
There are certain rock vocal styles that Adam has never done and I hope he never does.
For example, in metal there is a "death growl. It is guttural vocals that I understand can cause vocal damage. Perhaps Cassie can comment on it.
There are a variety of styles of "screaming" in vocal music -- like John Lennon, King Crimson or the Ramones did. Adam does a rock wail but he does not do a tortured scream.
There is not one rock vocal style -- rock vocals range from multi-part harmonies that come from doo wop to the thrashed vocals from punk. I doubt anyone can sing all these styles.
Adam seems to be learning how to take care of his voice and will hopefully avoid the problems that many famous rock vocalists have had, like Robert Plant.
en.allexperts.com/q/Led-Zeppelin-501/Robert-Plant-voice-1.htmFinally, and I have not research this, but most of the famous male rock vocalists are baritones I believe. Adam is a high tenor. It means that he can do some very unusual things but he will always sound different to an audience trained to here the darker tone of a baritone.
Rock frontman who are baris usually with a well-developed falsetto---
Jim Morrison from the Doors
Travis Meeks from Days of the New
Scott Stapp from Creed
Jimi Hendrix
Elvis Presly
Steven Tyler of Aerosmith
Rob Halford of Judas Priest
Geoff Tate of Queensrych
Axl Rose
Freddie Mercury
Even Bowie -- who is considered a pop vocalist was a Baritone.
The only famous tenor rock frontman who I can think of is Steve Perry. I am sure there are others.
Adam isn't just a tenor -- but he seems to naturally fall in the high tenor range. I really do not think there is another male rock vocalist with his vocal profile and style. But maybe I am missing someone obvious.
Adam does remind me of Sam Cooke and some other R&B and Gospel singers. He has the same range as Aretha and would have done her justice in that Grammy tribute if the Grammy producers where open-minded enough to add a male divo.
