Gomer Pyle, USMC - The Impossible Dream
I link to the long version, which includes the equally good setup to the song. Although Wiki tells me Gomer had sung on the show before I think this was the first I'd ever heard him sing. Awesomely mind boggling!
Corrected the link.
I would have expected a high tenor out of Mr. Gaw-Lee. It’s a mezzo baritone.