Here's one for you -- Dan Vasc is a Brazilian singer, classically-trained, but whose main genre is heavy metal. His cover of Amazing Grace is an incredible performance -- the things he does with his voice across multiple register changes are really impressive, and as a longtime chorister I am in awe (/envious) of his breath control.
https://youtube.com/watch?v=89g9yMGFGlM
(For lots of needy details about how he's vocalizing, here's a great reaction/breakdown video by a vocal coach:
https://youtube.com/watch?v=bFG6LZM3EDA)
His Adeste Fidelis is also a thing of joy. More Christmas carols should be sung this way!
https://youtube.com/watch?v=EyrqmLfh-Qs