One thing about this song that the article doesn't really go into is that the chords are just insane, really unusual, and yet it works perfectly - it sounds very different to your average song but it doesn't sound wrong or off-key.
The chord progression is rather conventional for this style of music, especially for the late 1940s. Listen to some songs by Cole Porter, Duke Ellington or Vernon Duke from the 1930s.
Just to be contrarian: 'Alone Together' and 'You and the Night and the Music' by Dietz and Schwartz, as well as 'Yesterdays' by Jerome Kern, feature similar harmony, just to name a few popular jazz standards. I'm looking at an original sheet of 'Nature Boy' now and see 1 diminished chord, a couple #5's and a couple b9's: not that unusual really, certainly not in jazz.
There's much this articles doesn't mention, such as the hugely popular modern representation of the song in the movie Moulin Rouge, and the songs origin in a Yiddish song and even as far back as Dvorak: https://en.wikipedia.org/wiki/Nature_Boy
