Steve Balsamo takes the crown in terms of "Gethsemane".
And also, Ty Taylor's high F on "LOOOOOOOOOOORD" on "On the Deck" from SFANW is absolutely amazing.
But I'd say the winner is Tituss Burgess, not just on "Under the Sea," but on "Oh What a Night" as well. He hits that same note.
"How could she just suddenly, completely disappear into thin water?" - The Little Mermaid